Instrumentation Description and Specification

Debbie Harris, Sam Childress,

On behalf of the NuMI Project

January 22, 2004

For completeness, the following tables give first the characteristics of
the primary beam to be transported to the NuMI Target, as well as the
extraction method and parameters of the beam itself.

## Primary Beam Information 

+---------------------------+------------------------------------------+
| Proton beam energy        | 120 GeV                                  |
+---------------------------+------------------------------------------+
| Spill cycle time          | 1.87 sec                                 |
+---------------------------+------------------------------------------+
| Bunch length              | 3-8 nsec                                 |
+---------------------------+------------------------------------------+
| Batch length              | 84 bunches                               |
+---------------------------+------------------------------------------+
| Bunch spacing             | 18.8 nsec (53 MHz)                       |
+---------------------------+------------------------------------------+
|                           |                                          |
+---------------------------+------------------------------------------+
| Emittance                 | 40π mm-mr expected                       |
|                           |                                          |
|                           | 500π mm-mr max                           |
+---------------------------+------------------------------------------+
| Momentum spread           | 8 x 10^-4^ δp/p (2σ expected)            |
|                           |                                          |
|                           | 3 x 10^-3^ δp/p (max)                    |
+---------------------------+------------------------------------------+
| NuMI spill (pbar          | 5 batches x 84 bunches = 8.2 μsec        |
| operation)                |                                          |
+---------------------------+------------------------------------------+
| NuMI spill (no pbar       | 6 batches x 84 bunches = 9.8 μsec        |
| operation)                |                                          |
+---------------------------+------------------------------------------+
|                           |                                          |
+---------------------------+------------------------------------------+
| Maximum intensity         | 4 x 10^13^ ppp (protons/spill)           |
+---------------------------+------------------------------------------+
| Total beam power          | 404 kW at maximum intensity              |
+---------------------------+------------------------------------------+

## Extraction Method and Parameters 

  ---------------------------------- ------------------------------------
  Extraction                         Single turn

  Method                             3 traveling wave kicker magnets

                                     

  Position stability (transport)     ± 1 mm max

  Beam size @ target                 1 mm H x 1 mm V (σ)

  Position stability @ target        ± 250 μ

  Angular stability @ target         ± 60 μ-radian max

                                     

  Max DC beam loss (MI region)       10^-4^ at maximum intensity

  Max DC beam loss (Carrier pipe)    10^-6^ at maximum intensity

  Max DC beam loss (Pre-target)      10^-4^ at maximum intensity

  Max beam loss - accident           5 spills at maximum intensity
  ---------------------------------- ------------------------------------

The following figure shows schematically what focusing devices and what
beamline instrumentation is needed to transport 120GeV protons from the
Main Injector to the NuMI Target. Distances in the figure are in units
of feet from the upstream face of Q608.

![](media/image1.png){width="5.995138888888889in"
height="7.415277777777778in"}

There are two different regions in the NuMI beamline: the more upstream
region (labeled in the diagram as the Extraction Enclosure, NuMI Stub,
and Upper Hobbit) is

Accessed through the Main Injector, and access is relatively remote---in
order to work on devices in that region the Main Injector must be
accessed, which would affect many other experiments besides NuMI. The
region downstream of the Hobbit Door is accessed through NuMI and
affects only NuMI. We describe the different kinds of instrumentation in
the beamline, noting how many devices are in each region.

There are five kinds of instrumentation needed for NuMI:

**Profile Monitors** (10 pairs of x and y planes, 5 pairs in the Main
Injector Access region, 5 pairs in the NuMI access region )

**Calibration Targets** The purpose of these is to put a given amount of
material in the beamline in order to calibrate the response on the
relevant loss monitors. The actual material in the beam is simply a
foil, and no signal is read out from it. The thickness of the foil
should correspond to several times that of the profile monitors, since
MiniBooNE experience indicates that the beam loss monitors should
already be sensitive to placing the profile monitors in the beam. One
target is to go in the Main Injector Access region, and one in the NuMI
access region.

**BPM's** (11 Vertical, 13 Horizontal, roughly half in the MI region and
half in the NuMI region) Electronics for these 24 BPM's is needed, as
well as electronics for 4

BPM's in the main injector. The BPM's in the Main Injector that need
NuMI-style BPM electronics are located after Q602 (H) ,Q604 (H), (Q606
H) and Q608 (H).

**Total Loss Monitors** 4 of varying lengths, 2 in the MI region, and 2
in the NuMI region

Not Shown: **BLM's**: 45 sealed units, in other words one on every
magnet in the beamline (plus 7 spares in case additional locations need
to be monitored, and 8 spares located "upstairs", in case of BLM
failure). 52 Channels of electronics requested

# Instrumentation List and Brief Specifications

+---------------------------+---+------------------------------------------+
| Dynamic range of          | 1 |                                          |
| Intensity                 | 0 |                                          |
|                           | 0 |                                          |
|                           | ( |                                          |
|                           | = |                                          |
|                           | 4 |                                          |
|                           | x |                                          |
|                           | 1 |                                          |
|                           | 0 |                                          |
|                           | ^ |                                          |
|                           | 1 |                                          |
|                           | 3 |                                          |
|                           | ^ |                                          |
|                           | / |                                          |
|                           | 4 |                                          |
|                           | x |                                          |
|                           | 1 |                                          |
|                           | 0 |                                          |
|                           | ^ |                                          |
|                           | 1 |                                          |
|                           | 1 |                                          |
|                           | ^ |                                          |
|                           | p |                                          |
|                           | r |                                          |
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|                           | t |                                          |
|                           | o |                                          |
|                           | n |                                          |
|                           | s |                                          |
|                           | / |                                          |
|                           | s |                                          |
|                           | p |                                          |
|                           | i |                                          |
|                           | l |                                          |
|                           | l |                                          |
|                           | ) |                                          |
+---------------------------+---+------------------------------------------+
|                           |   |                                          |
+---------------------------+---+------------------------------------------+
| ## Profile monitors       | T |                                          |
|                           | i |                                          |
|                           | F |                                          |
|                           | o |                                          |
|                           | i |                                          |
|                           | l |                                          |
|                           | S |                                          |
|                           | E |                                          |
|                           | M |                                          |
|                           | ( |                                          |
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|                           | p |                                          |
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|                           | d |                                          |
|                           | a |                                          |
|                           | t |                                          |
|                           | U |                                          |
|                           | T |                                          |
|                           | A |                                          |
|                           | ) |                                          |
+---------------------------+---+------------------------------------------+
| Thickness of Foils        | 5 |                                          |
|                           | m |                                          |
| Spacing                   | i |                                          |
|                           | c |                                          |
| Width of Foils            | r |                                          |
|                           | o |                                          |
|                           | n |                                          |
|                           | s |                                          |
|                           |   |                                          |
|                           | 1 |                                          |
|                           | m |                                          |
|                           | m |                                          |
|                           | ( |                                          |
|                           | 0 |                                          |
|                           | . |                                          |
|                           | 5 |                                          |
|                           | m |                                          |
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|                           | o |                                          |
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|                           | 2 |                                          |
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|                           | ) |                                          |
|                           |   |                                          |
|                           | 0 |                                          |
|                           | . |                                          |
|                           | 2 |                                          |
|                           | 5 |                                          |
|                           | m |                                          |
|                           | m |                                          |
+---------------------------+---+------------------------------------------+
| MI Access region          |   | 6 (H+V)                                  |
+---------------------------+---+------------------------------------------+
| NuMI Access region        | 6 |                                          |
|                           | ( |                                          |
|                           | H |                                          |
|                           | + |                                          |
|                           | V |                                          |
|                           | ) |                                          |
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|                           | i |                                          |
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|                           | 2 |                                          |
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|                           | r |                                          |
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|                           | e |                                          |
|                           | t |                                          |
+---------------------------+---+------------------------------------------+
| Position reproducibility  | \ |                                          |
|                           | < |                                          |
|                           | 5 |                                          |
|                           | 0 |                                          |
|                           | μ |                                          |
|                           | m |                                          |
|                           | ( |                                          |
|                           | t |                                          |
|                           | a |                                          |
|                           | r |                                          |
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|                           | ) |                                          |
|                           | \ |                                          |
|                           | < |                                          |
|                           | 1 |                                          |
|                           | 0 |                                          |
|                           | 0 |                                          |
|                           | μ |                                          |
|                           | m |                                          |
|                           | ( |                                          |
|                           | o |                                          |
|                           | t |                                          |
|                           | h |                                          |
|                           | e |                                          |
|                           | r |                                          |
|                           | s |                                          |
|                           | ) |                                          |
+---------------------------+---+------------------------------------------+
| Foil Alignment precision  | 0 |                                          |
| with respect to external  | . |                                          |
| fiducial                  | 0 |                                          |
|                           | 0 |                                          |
|                           | 5 |                                          |
|                           | " |                                          |
|                           | ( |                                          |
|                           | 1 |                                          |
|                           | 2 |                                          |
|                           | 5 |                                          |
|                           | μ |                                          |
|                           | m |                                          |
|                           | ) |                                          |
+---------------------------+---+------------------------------------------+
| Intensity range           | 2 |                                          |
|                           | . |                                          |
|                           | 5 |                                          |
|                           | x |                                          |
|                           | 1 |                                          |
|                           | 0 |                                          |
|                           | ^ |                                          |
|                           | 1 |                                          |
|                           | 1 |                                          |
|                           | ^ |                                          |
|                           | p |                                          |
|                           | p |                                          |
|                           | p |                                          |
|                           | t |                                          |
|                           | o |                                          |
|                           | 4 |                                          |
|                           | x |                                          |
|                           | 1 |                                          |
|                           | 0 |                                          |
|                           | ^ |                                          |
|                           | 1 |                                          |
|                           | 3 |                                          |
|                           | ^ |                                          |
|                           | p |                                          |
|                           | p |                                          |
|                           | p |                                          |
+---------------------------+---+------------------------------------------+
| Channel signal/noise      | 1 |                                          |
|                           | 0 |                                          |
|                           | 0 |                                          |
|                           | x |                                          |
|                           | o |                                          |
|                           | v |                                          |
|                           | e |                                          |
|                           | r |                                          |
|                           | i |                                          |
|                           | n |                                          |
|                           | t |                                          |
|                           | e |                                          |
|                           | n |                                          |
|                           | s |                                          |
|                           | i |                                          |
|                           | t |                                          |
|                           | y |                                          |
|                           | r |                                          |
|                           | a |                                          |
|                           | n |                                          |
|                           | g |                                          |
|                           | e |                                          |
+---------------------------+---+------------------------------------------+
| Vacuum Flange Size        | 4 |                                          |
|                           | " |                                          |
+---------------------------+---+------------------------------------------+
| Ion Pump Port on Vacuum   | Y |                                          |
| Can                       | e |                                          |
|                           | s |                                          |
+---------------------------+---+------------------------------------------+
| Readout                   | O |                                          |
|                           | n |                                          |
|                           | c |                                          |
|                           | e |                                          |
|                           | p |                                          |
|                           | e |                                          |
|                           | r |                                          |
|                           | p |                                          |
|                           | u |                                          |
|                           | l |                                          |
|                           | s |                                          |
|                           | e |                                          |
+---------------------------+---+------------------------------------------+
| Mounting Angle of vacuum  | 4 |                                          |
| can with respect to       | 5 |                                          |
| horizontal                | ^ |                                          |
|                           | o |                                          |
|                           | ^ |                                          |
+---------------------------+---+------------------------------------------+

# 

  --------------------------- -------------------------------------------
  **Calibration Targets**     

  Material in Beam            10μm Ti foil

  MI Access region            1

  NuMI Access region          1

  Alignment tolerance         Modest

  Position Reproducibility    Modest

  Readout                     None

  Mounting Angle of vacuum    45^o^
  can with respect to         
  horizontal                  

  Ion Pump Port on Vac. Can   Yes

  Stands Required             Identical to Profile Monitors

                              
  --------------------------- -------------------------------------------

+---------------------------+------------------------------------------+
| ## Beam position monitors | Cylindrical plate BPM                    |
+---------------------------+------------------------------------------+
| Transport region          | 12 H + 10 V                              |
+---------------------------+------------------------------------------+
| Position resolution       | 0.2 mm rms within ± 20 mm for 3x10^10^   |
|                           | to 9.5x10^10^ protons/bunch              |
+---------------------------+------------------------------------------+
| Intensity resolution      | ± 3%                                     |
+---------------------------+------------------------------------------+
| Sampling                  | One sample per batch (80 bunches)        |
+---------------------------+------------------------------------------+
| Calibration               | Electronics charge injection inter-spill |
+---------------------------+------------------------------------------+
| Targeting                 | 2 H + 2 V                                |
+---------------------------+------------------------------------------+
| Position resolution       | 0.05 mm rms within ± 6 mm for 3x10^10^   |
|                           | to 9.5x10^10^ protons/bunch              |
+---------------------------+------------------------------------------+
| Intensity resolution      | ± 3%                                     |
+---------------------------+------------------------------------------+
| Sampling                  | One sample per batch (84 bunches)        |
+---------------------------+------------------------------------------+
| Required readback time    | 0.5 sec                                  |
+---------------------------+------------------------------------------+
| Calibration               | Electronics charge injection inter-spill |
|                           |                                          |
| BPM Electronics           | Needed for 28 BPM's                      |
+---------------------------+------------------------------------------+
| Crate Locations           | 13 Channels in MI60 Service Bldg (MI60N) |
|                           |                                          |
|                           | 11 Channels in MI65 Service Bldg         |
|                           | Electronics Room                         |
|                           |                                          |
|                           | 4 Channels of Electronics for MI Quads   |
|                           | (MI60N)                                  |
+---------------------------+------------------------------------------+
| Position stability @      | ± 250 μ                                  |
| target                    |                                          |
+---------------------------+------------------------------------------+

+---------------------------+------------------------------------------+
| ##                        | 2 needed, 1 in MI access, one in NuMI    |
|  Toroid intensity monitor | access                                   |
+---------------------------+------------------------------------------+
| Intensity resolution      | 3% absolute for \> 1x10^13^ppp           |
+---------------------------+------------------------------------------+
| Stability                 | \< 3% at \> 1x10^13^ppp                  |
+---------------------------+------------------------------------------+
| Monitoring                | None required                            |
+---------------------------+------------------------------------------+
| Readout                   | Once per pulse                           |
+---------------------------+------------------------------------------+
| Differential Signal       | Not required in hardware                 |
+---------------------------+------------------------------------------+
| ## Beam loss monitors     | 45 Sealed gas ionization chambers        |
|                           |                                          |
|                           | (+7 spares in beamline, + 8 spares       |
|                           | upstairs)                                |
+---------------------------+------------------------------------------+
| ##  T                     | Channels to read out 52 units            |
| otal Electronics Channels |                                          |
+---------------------------+------------------------------------------+
| Accuracy                  | ± 30% at 2x10^8^ppp                      |
+---------------------------+------------------------------------------+
| Dynamic range             | 2x10^8^ to 4x10^12^ppp                   |
+---------------------------+------------------------------------------+
| Monitoring                | High voltage status                      |
+---------------------------+------------------------------------------+
| Function                  | Sensitive to small localized losses      |
+---------------------------+------------------------------------------+
| Readout                   | Once per pulse                           |
+---------------------------+------------------------------------------+
|                           |                                          |
+---------------------------+------------------------------------------+

#  

# 

+---------------------------+------------------------------------------+
| ## Total Loss Monitors    | 4 coax hose ionization, Ar-CO2 purged    |
+---------------------------+------------------------------------------+
| MI Access region          | 1 of 194\' long, 1 of 220\' long         |
+---------------------------+------------------------------------------+
| NuMI Access region        | 1 of 194' long, 1 of 155' long           |
+---------------------------+------------------------------------------+
| Accuracy                  | ± 30% at 2x10^9^ppp                      |
+---------------------------+------------------------------------------+
| Dynamic range             | 2x10^9^ to 4x10^13^ppp                   |
+---------------------------+------------------------------------------+
| Monitoring                | Radioactive source current inter-spill   |
|                           |                                          |
|                           | High Voltage Status                      |
|                           |                                          |
|                           | Gas Flow                                 |
+---------------------------+------------------------------------------+
| Function                  | Sensitive to large losses                |
+---------------------------+------------------------------------------+
| Readout                   | Once per pulse                           |
+---------------------------+------------------------------------------+

+---------------------------+---+------------------------------------------+
| ##                        | M |                                          |
|  Backup profile monitors  | u |                                          |
|                           | l |                                          |
|                           | t |                                          |
|                           | i |                                          |
|                           | w |                                          |
|                           | i |                                          |
|                           | r |                                          |
|                           | e |                                          |
|                           | S |                                          |
|                           | E |                                          |
|                           | M |                                          |
|                           | ( |                                          |
|                           | d |                                          |
|                           | e |                                          |
|                           | v |                                          |
|                           | e |                                          |
|                           | l |                                          |
|                           | o |                                          |
|                           | p |                                          |
|                           | e |                                          |
|                           | d |                                          |
|                           | a |                                          |
|                           | t |                                          |
|                           | F |                                          |
|                           | N |                                          |
|                           | A |                                          |
|                           | L |                                          |
|                           | ) |                                          |
+---------------------------+---+------------------------------------------+
| Thickness of wires        | 0 |                                          |
|                           | . |                                          |
| Wire Spacing              | 0 |                                          |
|                           | 0 |                                          |
|                           | 1 |                                          |
|                           | " |                                          |
|                           | d |                                          |
|                           | i |                                          |
|                           | a |                                          |
|                           | m |                                          |
|                           | e |                                          |
|                           | t |                                          |
|                           | e |                                          |
|                           | r |                                          |
|                           | W |                                          |
|                           | w |                                          |
|                           | i |                                          |
|                           | r |                                          |
|                           | e |                                          |
|                           |   |                                          |
|                           | 1 |                                          |
|                           | m |                                          |
|                           | m |                                          |
+---------------------------+---+------------------------------------------+
| MI Access region          |   | 6 (H+V)                                  |
+---------------------------+---+------------------------------------------+
| Position reproducibility  | \ |                                          |
|                           | < |                                          |
|                           | 1 |                                          |
|                           | 0 |                                          |
|                           | 0 |                                          |
|                           | μ |                                          |
|                           | m |                                          |
+---------------------------+---+------------------------------------------+
| Foil Alignment precision  | 0 |                                          |
| with respect to external  | . |                                          |
| fiducial                  | 0 |                                          |
|                           | 0 |                                          |
|                           | 5 |                                          |
|                           | " |                                          |
|                           | ( |                                          |
|                           | 1 |                                          |
|                           | 2 |                                          |
|                           | 5 |                                          |
|                           | μ |                                          |
|                           | m |                                          |
|                           | ) |                                          |
+---------------------------+---+------------------------------------------+
| Intensity range           | 2 |                                          |
|                           | . |                                          |
|                           | 5 |                                          |
|                           | x |                                          |
|                           | 1 |                                          |
|                           | 0 |                                          |
|                           | ^ |                                          |
|                           | 1 |                                          |
|                           | 1 |                                          |
|                           | ^ |                                          |
|                           | p |                                          |
|                           | p |                                          |
|                           | p |                                          |
|                           | t |                                          |
|                           | o |                                          |
|                           | 4 |                                          |
|                           | x |                                          |
|                           | 1 |                                          |
|                           | 0 |                                          |
|                           | ^ |                                          |
|                           | 1 |                                          |
|                           | 3 |                                          |
|                           | ^ |                                          |
|                           | p |                                          |
|                           | p |                                          |
|                           | p |                                          |
+---------------------------+---+------------------------------------------+
| Channel signal/noise      | 1 |                                          |
|                           | 0 |                                          |
|                           | 0 |                                          |
|                           | x |                                          |
|                           | o |                                          |
|                           | v |                                          |
|                           | e |                                          |
|                           | r |                                          |
|                           | i |                                          |
|                           | n |                                          |
|                           | t |                                          |
|                           | e |                                          |
|                           | n |                                          |
|                           | s |                                          |
|                           | i |                                          |
|                           | t |                                          |
|                           | y |                                          |
|                           | r |                                          |
|                           | a |                                          |
|                           | n |                                          |
|                           | g |                                          |
|                           | e |                                          |
+---------------------------+---+------------------------------------------+
| Vacuum Flange Size        | 4 |                                          |
|                           | " |                                          |
+---------------------------+---+------------------------------------------+
| Ion Pump Port on Vacuum   | Y |                                          |
| Can                       | e |                                          |
|                           | s |                                          |
+---------------------------+---+------------------------------------------+
| Readout                   | O |                                          |
|                           | n |                                          |
|                           | c |                                          |
|                           | e |                                          |
|                           | p |                                          |
|                           | e |                                          |
|                           | r |                                          |
|                           | p |                                          |
|                           | u |                                          |
|                           | l |                                          |
|                           | s |                                          |
|                           | e |                                          |
+---------------------------+---+------------------------------------------+
| Mounting Angle of vacuum  | 4 |                                          |
| can with respect to       | 5 |                                          |
| horizontal                | ^ |                                          |
|                           | o |                                          |
|                           | ^ |                                          |
+---------------------------+---+------------------------------------------+

**Appendix A:** **Detailed Specifications for Position/intensity
monitors (BPM's)**

There are specified 24 position/intensity monitors, 13 horizontal and 11
vertical. The detectors are standard design split plate Beam Position
Monitors. These intercept no beam and will provide position information
during normal operation. All units have intensity, as well as position,
readouts. BPM specifications are provided in the table below.

+-----------------------+-----------------------+-----------------------+
|                       | # Transport BPM       | # Target BPM          |
+-----------------------+-----------------------+-----------------------+
| \# Channels           | 20 for NuMI + 4 for   | 4                     |
|                       | MI                    |                       |
+-----------------------+-----------------------+-----------------------+
| System Type           | Single Pass           | Single Pass           |
+-----------------------+-----------------------+-----------------------+
| Beam Bunch Freq       | 53 MHz                | 53 MHz                |
+-----------------------+-----------------------+-----------------------+
| \# Bunches            | 84 x (1 to 6)         | 84 x (1 to 6)         |
+-----------------------+-----------------------+-----------------------+
| Dynamic Range         | 5e9 -- 10e10          | 5e9 -- 10e10          |
|                       |                       |                       |
| (particles/bunch)     |                       |                       |
+-----------------------+-----------------------+-----------------------+
| Processing BW         | Single batch          | Single batch          |
+-----------------------+-----------------------+-----------------------+
| Position Accuracy     | 0.2 @ 1e10            | 1.  @ 1e10            |
| (mm)                  |                       |                       |
|                       | 0.3 @ 4.5e9           | 0.15 @ 4.5e9          |
| RMS                   |                       |                       |
|                       | (over +/- 20 mm)      | (over +/- 6 mm)       |
| (may be too           |                       |                       |
| optimistic)           |                       |                       |
+-----------------------+-----------------------+-----------------------+
| Plate Diameter (mm)   | 100                   | 50                    |
+-----------------------+-----------------------+-----------------------+
| Stability (mm)        | \*\*                  | \*\*                  |
+-----------------------+-----------------------+-----------------------+
| Resolution (mm)       | \*\*                  | \*\*                  |
+-----------------------+-----------------------+-----------------------+
| Processing Technology | Digital Receiver      | Digital Receiver      |
+-----------------------+-----------------------+-----------------------+
| Signal Cables         | 3/8 in. Heliax        | 3/8 in. Heliax        |
+-----------------------+-----------------------+-----------------------+

\*\* As necessary to provide specified position accuracy in stable and
robust form for each beam pulse.

**Table** Beam Position Monitor specifications

**Appendix B: Detailed Specifications for Profile Monitors**

[I. Foil Specifications]{.underline}

1\) The strip pitch shall be 1mm for all but two of the SEM\'s. The last
two shall have 0.5mm pitch. The two 0.5mm pitch SEM\'s are to be used in
the pretarget area. The tolerance on this pitch is 100μm for the 1mm
SEM's and 50μm for the 0.5mm SEM's.

2\) Insertion of the foils into the beam must be achievable without
dropping the beam permit system; *ie:* any large frames are to be always
out of the beam.

3\) The signal and bias foils are to be 5μm Titanium. The signal strip
width shall be \<0.25mm.

4\) The 9 transport SEM's to be built must provide 3\" clear aperture
with foils out of the beam. With foils in the beam, any frames must be
\>1.5\" radius from the beam axis. For the 3 pre-targeting SEM's to be
built, the requirement is 2" beam aperture.

5\) For the 10 transport area SEM's the profile measuring area must be
\>40mm in both X and Y views. Halo foils must fill the remaining
aperture out to 3\". For the pre-targeting SEM's, the measuring area is
to be 20mm wide, with the remainder of the 2" aperture filled with halo
foils.

6\) The foil strips shall not be out-of-plane by more than 20º.

7\) Of the 10 spare paddles to be built, 7 shall be of 1.0mm pitch, and
3 of 0.5mm pitch

[II. Vacuum:]{.underline}

1\) The SEM chamber after bakeout should hold constant pressure of
3×10^-8^ Torr isolated on a 30 l/sec ion pump.

2\) The chamber should pump down from 1atmosphere dry N~2~ to 10^-6^
Torr (turn-on pressure of the ion pump) using 200 l/s turbo within
\<4hrs.

3\) The connection of the SEM to adjacent beamline elements is to be
made via two 4\"OD

beam port tubes. These tubes shall be fitted with \"Main Injector 4in.
diameter Quick Disconnect\" flanges (Fermilab dwg \# 9512-MB-359521).
Fermilab agrees to provide University of Texas at least 30 of these
flanges.

4\) Each SEM vacuum chamber shall have a 4.5" OD conflate flange for ion
pump attachment.

[III. Physical Size:]{.underline}

1\) The flange-to-flange distance along the beam must be 9.25\".

2\) The vacuum chamber body must be \<8\" along the beamline in order to
fit in tight regions in the Main Injector (MI).

[IV. Controls, Interfaces:]{.underline}

1\) The drive mechanism for the SEM paddle must be 6 wire, unipolar
motor (to be controlled by the stepper controller system developed by Al
Legan in the FNAL Controls Dept.). The motor specs are that it should
draw \<3A, and be \<3mH inductance, \<2ohms, and operated at 48V.

2\) The motor is to be halted by two limit switches at the ends of
travel.

3\) A 10V (maximum) DC signal will be sent to the controller from an
LVDT which may be used to refine cycle-to-cycle position variations.

4\) The SEM will require no more than one bias voltage channel with a
voltage \<500V. The high voltage connection shall be via an SHV
connector on the SEM.

5\) The SEM will have two 50-pin D-sub connectors for readout of the
signal strips. The pin-out of the connectors shall be as prescribed by
Fermilab Beams Division Instrumentation Department.

[V. Foil Positioning:]{.underline}

1\) The foils must be insertable and retractable from the beam. When
reinserted into beam, the foils\' position relative to its previous
insertion must be known within 50μm accuracy.

2\) The exterior of the SEM must have reference markers. The foil
position inside the vacuum can must be referenced with respect to these
external survey markers on the device within 0.005\".

3\) The foils must be inserted in the beam within a time span of
\<15seconds.

4\) The SEM motion drive system must be rated to survive 20,000
insertions into the beamline.

[VI. Maintenance:]{.underline}

1\) Replacement of device is to be performed by swapping of entire
vacuum can. Repair of internal foil is to be done in dedicated lab
outside the accelerator tunnel.

2\) For ease of installation and swapping, the device should weigh
\<100lbs.

[VII. Environmental:]{.underline}

1\) The devices are to be tolerant of up to 100 kRad. Components which
are not radiation-resistant should be outside the vacuum chamber.

2\) The electrical connections of the SEM are to be protected against
humidity and possible dripping water.