# Presentation: 535564

## WBS 1.1.2 Neutrino Beam DevicesTarget Hall Instrumentation Review

- Agenda:
- Overview - J. Hylen (15+5) min
- Electronics channels (readout into ACNET and Beam Permit, comprehensive list of channels, details of motor controls, LVDT's, thermocouples) - R. Talaga (30+15) min
- Cross Hair System - D. Ayres (15+10) min
- Recirculating Air System Controls - A. Stefanik (15+10) min
- 			(Times: minutes of talk + minutes allowance for discussion)

## What is WBS 1.1.2 Scope ?  Neutrino Beam Production Devices and Target Pile

- 				Beamline Component Positioning Modules
- 			Two Types of Magnetic Focusing Horns
-  		Pion Production Target (plus readout of target, vacuum pump)
- 	Baffle to protect horn from beam accidents
- Target Hall Radiation Shielding
- Hot (Radioactive) Component Workcell and Hot Handling Procedures/Tooling
- Shield Pile Recirculating Air Cooling System
- Lifting fixtures, transportation carts, magnetic field probes, prototyping, test stand, install

- Alternate Horn Positions

## NuMI Target Hallbeam’s eye view

- Horn+Module in transit
-        Stripline
-       Concrete Cover
-     “Carriage” - Module
-                  Support Beams
-     Horn Shielding Module
-    Horn
-   Steel Shielding
-  Air Cooling Passage
- Concrete Shielding

*Temporary Stackup*
*   **of removed shielding*
- Steel from module middle
- Concrete from over horn

- Beam passageway (chase)
-    is 1.2 m wide x 1.3 high,
-       forced-air-cooled

## Target PileShielding and Carriages

- Carriages:
-   Cross-beams that
-       modules hang from

## Target Hall InstrumentationScope of This Review

- This review:
- Connection to ACNET (MADC, PLC) (Rich Talaga)
- Connection to beam permit system (Rich Talaga)
- Alarms and limits (Rich Talaga)
- Module motion control (Rich Talaga)
- Cross hairs alignment system (Dave Ayres)
- Recirculating-forced-air cooling system instrumentation (Andy Stefanik)
- Devices not in review, but channel count / readout path is:
- Field monitor Bdot (have tested prototype)
- Target – Budal (tested in target test), vacuum/pressure, horn-collision sensor
- Baffle – Thermocouples (reviewed last August)
- Copy of horn currents
- Check of beam-to-horn-pulse timing (device not designed yet)
- Not in this review:
- RAW (target & horn cooling water) is WBS 117
- Horn Power Supply is WBS 113
- Hot Handling – camera system, hot cell controls (WBS 112 but no connection to outside systems)
- Transfer from ACNET to MINOS data stream - Brett Viren (MINOS DCS, WBS 2.3)

## General Level of Design

- Channel count and requirements on channels (mostly) set
- 	 (number, dynamic range, accuracy, alarm limits, beam permit usage)
- Readout path (MADC, IRM, PLC) identified
- Sensors identified (thermocouples, beam loss monitor chamber, pressure sensors, ...)
- Some signal conditioning hardware is not yet designed:
-  Integration, sample and hold on the beam pulse device signals which go to MADC
-  Relative timing signal between beam (Budal and BLM) and horn (current and field)
-  Signal conditioning for target/horn collision (short) sensor

## Types of issueswe would like reviewers to address

- Are we integrating into ACNET in a reasonably optimized manner?
- All signals (except internal PLC control of air system) will show up in ACNET
-  as simple parameter pages.  Is this sufficient for operations?
- Does the set of instrumentation for the air system look reasonable?
-   (e.g. we check that air is flowing by differential pressure rather than a flow sensor)
- Other parameters that need specification before designing remaining hardware?
- Review also brings management up to speed on current status.
*Now on to a picture show to give more of a feeling what we are working with...*
*	**and some status of systems not covered by other speakers.**	**	*

## Radiation Levels

- Power Supply Room:  ~ 1 - 10 Rad/yr (MADC, differential pressure sensor, ...)

- Cable route
- Patch panel

- Chase, around horns: ~ 1010 - 1011 Rad/yr (thermocouples, bdot coils, BLM ionization chamber)

-     Plan View
- ---------------
- Elevation View

- Target Hall above concrete covers:
-  	~ 102 – 104 Rad/yr
- (hot cell system, air recirculation system,
-  humidity sensors)
- Top of module, under concrete cover:
-  	~ 104 – 105 Rad/yr
- (motors, LVDTs, limit switches)

## Target

- Narrow – location checked by scanning beam across edge.
- Sense by:
-   (i) charge (delta-rays) knocked out (wire connected to target) (called Budal)
-   (ii) scattered beam  into cross hairs ionization chamber (BLM)

- Casing of target fin electrically insulated from base.
- Wire strung from case to top of module.  When moving,
-  can sense if case touches horn by short to “ground”.

## Target and Horn Module Instrumentation:motor drives and thermocouples

- Water tank

- Stripline

- Remote
- Stripline
- Clamp

- Baffle

- Target

- Target/Baffle
-     Module

- Horn 1 Module

- Horn 1

- 25 cm wide, 2 m deep Steel endwalls
-       with positioning, water, electric feedthroughs

- Motor drives for transverse
-   and vertical motion of carrier
-     relative to module

- Carrier

- Target moves relative to
-     carrier for insertion into horn for L.E. beam

## Target/Baffle Carrier:motor drive and thermocouple

- Moves Target by 2.5 m on beam axis
-     along with water, vac., elec. lines.
-     (extended travel aids in
-      commissioning and monitoring)
- Drive and position sensing is done
-   behind shielding at top of module,
-   only thermocouples are in high
-   radiation environment

## Horn(pion focusing device)

- I=200 kA, 2 ms pulse
- Max. field 3 Tesla
- Instrumentation:
- Six thermocouples on outer conductor –
-   difference in temperature top and bottom
-   could cause warp of horn shape
- Three bdot coils to monitor magnetic
-  field (described later)
- Cross hair system (described later)

- Prototype horn 1 in test stand

## Cross Hair Horn Alignment System

- Hole in shield to insert beam loss monitor

- Beam loss monitor ion chamber

- beam

- 12 mm x 1 mm Aluminum
-     cross hairs mounted on horn

- Function: Check position of horn w.r.t.
-    beam by beam scan (target-out)
-      Scan:	(1) horn 1 neck
-    	(2) horn 1 downstream
-   	(3) horn 2 upstream
- 	(4) horn 2 downstream

## StatusBdot Horn Magnetic Field Monitor

- 			3 bdot units per horn to monitor magnetic field each pulse
- Tested prototype:  8 turns of 0.01 inch diameter 304 stainless steel wire
- 		wrapped on MACOR form, 1.010 x 0.363 sq inch per turn
- 			mounted to Aluminum Oxide ceramic feedthrough
*In process of replacing MACOR with zirconia which is more radiation-hard*
*	**(involves redesign of form for manufacturability, can’t drill small holes)*
*Bob Wagner has demonstrated significant thermo-electric effects at solder joints*

## Test at MI-8 of Bdot coil magnetic field monitoring pickup

- Uncorrected
- Baseline
-   corrected

*1 pulse / 2sec      for       17 hours*

- 1%

- 1%

*Frank Nezrick demonstrated  that sampling the off-pulse baseline and subtracting it*
*   **from the signal gets rid of the thermally induced bdot instability*
*	*Goal of 0.4% stability has been achieved this way
*Integrator built, **but module to do subtraction in production DAQ has not been designed*

- 0                            Pulse Number                                                      30,000

- Bdot
- signal

## Baffleto protect target support and horn

- Protects horn neck, target cooling tubes
-     from beam accidents

-                          *BAFFLE*
-                  Aluminum tube
-             shrink wrapped
-       around graphite core with
-  11 mm diameter beam hole

- 150 cm

- 60 mm

- Instrumentation:
-  3 thermocouples banded
-  to outer casing
-  near downstream end

## Baffle – cool !but not too cool !

- Beam scraping on baffle affects spectrum
- Tune cooling so 1% scraping ~ 20 C T
-    easy to thermocouple monitor scraping!
- Done by covering 1/3 of baffle with
-   pin radiators:
-     (air cool)
- Calibrate by steering low intensity beam
-    100% into baffle
- Baffle limit 100 deg C or 5% at 4e13ppp

- (Mark Messier)

## Air Cooling System

- Air system for target pile:
- Recirculating to lower emission of radioactivated air
- 28,000 cfm to keep components cool and limit thermally induced misalignment
- Designed to remove 158 kw of the 400 kw total beam power
- Trying to keep relative humidity no more than 50%
- High efficiency filter to capture radioactive contamination
*Thermal model of module *
* **end-plate in target pile*

- Air
- Supply
- Return

## Target pile cooling

- _Interlock to beam permit:_
- Air flow:
-    differential pressure
- Temperature:
-    thermocouple at air entrance
-    to target pile
- _Temperature monitoring:_
- Pile as shown
-  (not reachable to replace)
-   plus thermocouples on modules

## Hot Handling Equipment:cameras, lift table controls

- Some items (camera systems, lead blanket on
-  dolly as shielding for crane operator) we will
-  develop during tests of handling at MI-8
-  after components are together.
*A quick test with borrowed cameras of*
* **remote handling of T-block*
*T-block landing guide*

## Hot handling camera system

- Cheap wireless TV transmission
-  system is being tested.
- Take signal from crane to upstream end of target hall
-  	2.4 GHz transmitter
- 	Antenna

## Hot Work Cellfor change-out of activated components

- Concrete shield
-   block walls
- Motorized
-   steel door
- Component
-   lifting table

- Railing,
-   platform
- Stairs
- Lead glass
-   window

## Lifting Table in Hot Cell

- Push horn or target up into module remotely –
-    5 degrees of motion

- Both tables
-    move together
-      along beam direction

- Each table has independent
-      vertical and transverse motion

## Hot cell lift table controls

- Testing control system that came with lift tables.
- May need modification.
-   (e.g. table slowly sinks under load with controls off)