# Presentation: 504883

## ILC Beam Instrumentation– A Short Overview of Fermilab R&D Activities –

**Manfred Wendt**
**Fermilab, AD-Instrumentation**

- 4/23/2007

- All Experiementers' Meeting

## The International Linear Collider

**4/23/2007**

**All Experiementers' Meeting**

| beam energy | = | 2 x 250 GeV |
| --- | --- | --- |
| luminosity L | = | 2 x 1034 |
| rep. frequency frep | = | 5 Hz |
| macro pulse length tpulse | = | 800 μs |
| # of bunches per pulse | = | 2820 |
| bunch spacing Δtb | = | 369 ns |
| bunch charge | =  | 3.2 nC |

| bunch length σz | ≈ | 300 μm |
| --- | --- | --- |
| vert. emittance γ εy* | =  | 0.04 mm mrad |
| RMS energy spread | = | 0.1 % |
| βx* (IP) | = | 21 mm |
| βy* (IP) | = | 0.4 mm |
| hor. beamsize (IP) σx | = | 500 nm |
| vert. beamsize (IP) σy | = | 5 nm |

- ILC Beam Parameters (nominal):

## ILC Beam Instrumentation

**~ 2000 Button/stripline BPM’s (10-30 / 0.5 μm resolution)**
**~ 1800 Cavity BPM’s (warm, 0.1-0.5 μm resolution)**
**     ****620 Cavity BPM’s (cold, part of the cryostat, ~ 1 μm)**
**       ****21 LASER Wirescanners (0.5-5 μm resolution)**
**       ****20 Wirescanners (traditional)**
**       ****15 Deflecting Mode Cavities (bunch lenght)**
**~ 1600 BLM’s**
**Many other beam monitors, including toroids, beam phase monitors, wall current monitors, faraday cups, OTR & other screen monitors, sync light monitors, streak cameras, feedback systems, etc.**
**Read-out & control electronics for all beam monitors **

**4/23/2007**

**All Experiementers' Meeting**

## ILC Instrumentation R&D activities at Fermilab include: 
Design and development of beam- and non-beam instrumentation
A Cold CM-free L-Band cavity BPM for the cryomodule
Digitizer boards: general purpose VME and high-speed HA ATCA-style
Reuse, upgrade of A0-Photoinjector beam instrumentation, e.g. BPM pickups, screen monitors, interferometer-based monitors, etc. 
RF-klystron interlock system
Non-beam cryomodule instrumentation: Faraday-cup & WPM read-out
     to support the on-site facilities:
SCRF test stands (HTS, CC2, etc.) 
A0-Photoinjector (including some new beam-line instrumentation for emittance exchange experiment)
NML test accelerator (focus is on non-beam instrumentation for startup)
ILC R&D collaboration activities:
ATF Damping Ring BPM Upgrade collaboration (KEK/SLAC/FNAL)
HOM coupler signal study collaboration at FLASH/TTF (DESY/SLAC/FNAL)
Electro-optical sampling (EOS) bunch length measurement collaboration (ANL/NIU/FNAL)
Planned: EOM-based beam phase measurement collaboration (DESY/FNAL)

**Design and development of beam- and non-beam instrumentation**
**A Cold CM-free L-Band cavity BPM for the cryomodule**
**Digitizer boards: general purpose VME and high-speed HA ATCA-style**
**Reuse, upgrade of A0-Photoinjector beam instrumentation, e.g. ****BPM pickups, screen monitors, interferometer-based monitors, etc. **
**RF-klystron interlock system**
**Non-beam cryomodule instrumentation: Faraday-cup & WPM read-out**
**     ****to support the on-site facilities:**
**SCRF test stands (HTS, CC2, etc.) **
**A0-Photoinjector (including some new beam-line instrumentation for emittance exchange experiment)**
**NML test accelerator ****(focus is on non-beam instrumentation for startup)**
**ILC R&D collaboration activities:**
**ATF Damping Ring BPM Upgrade collaboration (KEK/SLAC/FNAL)**
**HOM coupler signal study collaboration at FLASH/TTF (DESY/SLAC/FNAL)**
**Electro-optical sampling (EOS) bunch length measurement collaboration (ANL/NIU/FNAL)**
**Planned: EOM-based beam phase measurement collaboration (DESY/FNAL)**

**FNAL ILC Instrumentation R&D **

**4/23/2007**

**All Experiementers' Meeting**

## NML Beamline Instrumentation

**NML Beamline Instrumentation**

- beam-line for advanced beam instrumentation, e.g. EOS, Laser-wire, OTRI, cavity BPM’s,...

- RF-gun

- capture cavities1 & 2

- 3.9 Ghz cav

- doublet

- triplet

- quads

- beam
- trans.

- bunch compressor

- dipole

- low energy
- injector dump

***ILC Module 1***

- O

- O

- T

- S

- S

- O

- B

- O

- C

- B

- Y

- F

- T

- B

- T

- O

- Y

- O

- O

- S

- O

- T

- PS

- O

- O

- C

- S

- P

- T

- S

- Y

- O

- S

- O

- S

- S

- O

- T

- doublet

- S

- O

- B

- T

- O

- S

- O

- S

- S

- O

- T

- high energy intensity dump

- triplet

- doublet

- dog leg test beam-line (TBD)

- B

- C

- HOM couplers

- T

- Beam current / bunch charge (T:toroid)
- Time-of-flight or beam phase monitor
- Synchrotron light bunch length monitor
- BPM (B:button, S:stripline, C:cavity, PS:perp. stripline)
- Screen monitor (Y:YaG, O:OTR, C:CTR, S:slit, F:F-cup)

- S

- S

- S

- doublet

- dipole

- dipole

- doublet

**4/23/2007**

**All Experiementers' Meeting**

**phase I**

## Cold L-Band Cavity BPM R&D

- _Goal:_ Development of a**cold CM-free L-Band cavity BPM **with 1 μm single bunch resolution

**4/23/2007**

**All Experiementers' Meeting**

## Cavity BPM Principle

**Problems with simple**
**“****Pill-Box” Cavity BPM’s**
**TM****010**** monopole  common mode (CM)**
**Cross-talk (xy-axes, polarization)**
**Transient response (single-bunch measurements)**
**Wake-potential (heat-load, BBU)**
**Cryogenic and cleanroom requirements**

**4/23/2007**

**All Experiementers' Meeting**

## Cold Cavity BPM Prototyping

**4/23/2007**

**All Experiementers' Meeting**

## A0-Photoinjection Instrumentation

**4/23/2007**

**All Experiementers' Meeting**

- Button BPM

- Toroid

- Beam Phase Monitor

- Screen Monitors

## VME & ATCA Digitizer R&D

**4/23/2007**

**All Experiementers' Meeting**

**Generic and “fast” VME digitizer:**
**5.5 / 50 MS/s sampling rate**
**16 / 14 bit resolution**
**12 / 8 ADC/DAC channels**
**500k / 8M sample buffer per channel**
**FPGA programmable operation modes**
**High-speed ATCA digitizer R&D:**
**500 MS/s sampling rate**
**12 bit resolution**
**16 ADC/DAC channels**
**High-availability (HA) design**
**Analog front-end integration (rear transition module)**

## RF Klystron Protection Interlock

- Forward power 200 kW, undersampled

- Reflected power 200 kW

- 59.1 ns detection time!

- VME-based** RF klystron protection interlock **for klystron, waveguide and input coupler signals (fwd/refl-power, temperatures, PMT arc detection, etc.)

**4/23/2007**

**All Experiementers' Meeting**

## ATF Damping Ring BPM Upgrade

**ATF DR BPM Upgrade Collaboration **with help of the force of “Joda”_Goal:_ 0.1 μm resolution to achieve < 2 pm vertical emittance in the ATF damping ring_Achieved in March 07:_ 0.6 μm

**4/23/2007**

**All Experiementers' Meeting**

## HOM Coupler Signal Studies

**HOM Studies Collaboration**Beam-based cavity alignment,HOM BPM system (~ 5 μm res.)

**4/23/2007**

**All Experiementers' Meeting**

## EOS Bunch Length Measurement

- Electro-optical sampling (EOS) by temporal decoding

**EOM Studies Collaboration**at the ANL Advanced Wakefield Accelerator (AWA)_Goal:_ Bunch length measurement R&D

**4/23/2007**

**All Experiementers' Meeting**