# Presentation: 666894

## MUTAC ReviewMTA Instrumentation

- D.Errede, M. Haney
- University of Illinois at Urbana-Champaign
- April 28, 2004

## MTA Instrumentation

- M. Haney
- University of Illinois at Urbana-Champaign
- 25 February 2004

## MTA Instrumentation Data Paths

- Strain, temp

- temp

- Fast, _local_ signals(e.g. piezo transducer)

- Slow, _local_ signals(e.g. magnet current(s))

- To/From ACNET sources(i.e. other IRMs)

- To PC/LabView consumers

- In, on, or around the absorber

- M. Haney

- 25 Feb 2004

## Signals inside (the cryostat)

- 32 (cryo) temperatures
- 16 sensors inside absorber, 16 outside
- Front and back faces
- readout via Lakeshore 218S(s), GPIB + LabView (PC)
- Multiple fibers
- FISO fiber optic channels (4 fibers)
- strain, temperature
- Laser occlusion (2 fibers)
- Edgar Black looking at a scheme using standard data fibers...

- M. Haney

- 25 Feb 2004

## (more) Signals inside

- Piezo vibration sensor
- Available channel, but no sensor yet
- Readout via (16 chan/12 bit) ADC and LabView (PC)
- Local (64 chan/16 bit) IRM channels
- Readout via LabView

- M. Haney

- 25 Feb 2004

## Signals outside

- Many voltages, currents, temperatures, pressures
- magnets, beam position monitors, etc.
- Most available from local IRM or ACNET (other IRMs)
- via LabView
- or Quadlog-PLC
- Dedicated controller(s) used by Cryo system

- M. Haney

- 25 Feb 2004

## Instrumentation (1)

- Lakeshore 218S
- 8 channel cryo temperature monitor
- 20mV (diodes) or 50 m (RTD) resolution
- 10’s of mK at 20K
- 16 readings/s (/channel)
- GPIB interface (to PC)
- 4 units in-hand (and a spare)
- Will need to consider (re)calibration protocols

- M. Haney

- 25 Feb 2004

## Instrumentation (2)

- CX-1030-SD Cernox RTD sensors (12)
- -6.7 /K at 20K (e.g. calibrated device X28829)
- Better suited for lower temperatures
- Recommended for use in magnetic fields (B<19T)
- Rad hard
- CX-1050-SD Cernox RTD sensors (24)
- -25 /K at 20K (e.g. calibrated device X27990)
- Fermi “favorite”
- Also
- TG-120PL GaAlAs diodes (4)
- -180mV/K at 4.2 K
- for B < 5 T, but no longer claimed to be rad hard...

- M. Haney

- 25 Feb 2004

## Instrumentation (3)

- FISO Fiber-optic strain and temperature
- BUS chassis, with 4 (up to 8) modules
- 1000 readings/s
- RS-232 interface (to PC)
- FOS-N strain sensors
- +/- 5000 ; 0.01% full scale; 0.2mm O.D.
- FOT-L temp sensors
- 0.1 K resolution; 1.5mm x 32mm (10mm active)
- Slow: 1.5 second response...

- M. Haney

- 25 Feb 2004

## Instrumentation (4)

- Gateway E-4000 PC
- 1.8 GHz, 1Gbyte RAM, 0.5Gbyte cache
- 120Gbyte disk, Windows 2000
- 15” LCD flat panel display
- 640x480 CCD camera, microphone
- PCI-MIO-16E-1
- 16 channel ADC, 1.25 Msample/s, 12 bits, +/-10 V
- Tripplite Internet Office UPS
- 500 VA
- 30 minutes (nominal) power for PC
- But mostly intended as power filter for Lakeshore 218’s

- M. Haney

- 25 Feb 2004

## Two Safety Possibilities (1)

- Gas-purged box

- UPS

- PC w/16 chan
- ADC

- FISO

- LakeShore(s)(temp)

- IRM

- Barrier(s)

- network

- ACNET

- Sealed
- Conduit(s)

- power

- Hazard   Safe

- N2

- H2?

- LH

- O2!

- M. Haney

- 25 Feb 2004

## Two Safety Possibilities (2)

- Intrinsically safe

- UPS

- PC w/16 chan
- ADC

- FISO

- LakeShore(s)(temp)

- IRM

- Barrier(s)

- network

- ACNET

- Sealed
- Conduit(s)

- Intrinsically safe signal conditioners
- and transmitters (as needed)

- power

- Hazard   Safe

- M. Haney

- 25 Feb 2004

## (basic) Barrier

- Power
-      +
- Signal

- Return

- Ground

- “safe circuit”

- fuse

- M. Haney

- 25 Feb 2004

## Instrumentation (5)

- MTL7055ac barriers
- Low level AC
- 24  per line
- 3 V max
- MTL7060ac barriers
- Star-connected AC
- 101  per line
- 8.5 V max

- M. Haney

- 25 Feb 2004

## MTA Instrumentation:Data Paths: LabView Perspective

- Strain, temp

- temp

- Fast, _local_ signals(e.g. piezo transducer)

- Slow, _local_ signals(e.g. magnet current(s))

- From ACNET sources

- To PC/LabView consumers

- M. Haney

- 25 Feb 2004

## MTA Instrumentation:Data Paths: ACNET Perspective

- Strain, temp

- temp

- Fast, _local_ signals(e.g. piezo transducer)

- Slow, _local_ signals(e.g. magnet current(s))

- To ACNET consumers

- M. Haney

- 25 Feb 2004

## Instrumentation (6)

- IRM
- 64 channel multiplexed ADC
- 16 bit, 100 Ksamples/s
- ACNET network connection
- All PC data will be posted to IRM for ACNET access

- M. Haney

- 25 Feb 2004

## Wire Considerations -inside

- QuadTwist
- 2-pair, 36 AWGphosphor bronze
- Formvar insulated,color-coded
- Compared to 32 AWG manganin
- QT is pre-twisted, color coded pairs,0.63 smaller, yet 0.6 less DC resistance(!)
- But, QT has 1.9 greater thermal loss, and end-prep is (somewhat) delicate work
- If I can do it, it can’t be that delicate...

- M. Haney

- 25 Feb 2004

## Internal Shielding

- Stainless steel (36 AWG) drain, withfoil around pairs
- See next slide (foil+drain)
- Stainless steel braid around all
- Easier to handle than stainless conduit

- M. Haney

- 25 Feb 2004

## Wire Considerations -outside

- Shielded twisted pair
- Using 2-pair here
- foil-out, common drain
- Recommend N-pair
- foil-in, drain-per-pair
- Consistent with Lakeshore 218 shielding
- 4-wire measurement, shield-per-pair
- Belden offers (up to) 32-pair cables
- DigiKey has (up to) 6-pair

- M. Haney

- 25 Feb 2004

## End

- M. Haney

- 25 Feb 2004

## Status

- Hardware acquired
- PC, FISO, Lakeshore (temp) +sensors, IRM, etc.
- All major items in-hand
- Software written
- IRM communications: to, from
- Lakeshore readout
- FISO readout
- All major elements written and integrated
- For _one_ Lakeshore 218...
- Intrinsically safe solutions (barriers)

- M. Haney

- 25 Feb 2004

## Testing

- Lakeshore 218 monitor
- MTL7055ac (low level) and MTL7060ac (star-connected)
- Intrinsically Safe Barriers
- 23m (75 ft) of shielded twisted pair
- 2-pair, 22 AWG, belfoil (out), common drain
- $76/500ft from Digikey
- 30  on each of the 4 wires,
- to mimic 2m of 32 AWG manganin wire
- Lakeshore MW-32
- 13.5 /m at 4.2K, 14.3 /m at 77K
- 1000  load resistor
- Compare to CX-1050-SD-4L
- @14.000K, R = 819.7521 ; dR/dT = -50.16117 /K
- @20.000K, R = 607.6232 ; dR/dT = -25.14299 /K

- 218

- barriers

- 75’,shielded,
- twisted

- 30 ,
- times 4

- 1000 

- M. Haney

- 25 Feb 2004

## Results

- Cleanliness is paramount!
- 10 A excitation, so nanoamps of leakageare significant!
- Worst-case deviation: 0.5 
- 1000  on back of 218, *vs* full test setup
- At dR/dT = -25.14299 /K ...
- 0.0199 K (systematic) error

- M. Haney

- 25 Feb 2004

## Other/Work in Progress

- Recently acquired
- Keithley 7001 switch mainframe,  7013s isolated switch module
- Recently borrowed
- Keithley 2701 6 1⁄2 digit multimeter
- Goals
- Confirm quantitative cleanliness (little/no leakage)
- Confirm (non)effect of thermoelectric (junction) voltages

- M. Haney

- 25 Feb 2004

## Backup Slides

- M. Haney

- 25 Feb 2004

## Open Issues

- Wire+Shielding Concerns
- Cable plant into solenoid
- Shielded-twisted pairs (two pairs per Cernox)
- Shield drains carried from Lakeshore(s) to sensors(not grounded)
- Grounding
- Details depend on overall MuCool grounding scheme
- Common mode (surges) due to magnets
- Need to protect electronics without burning barriers
- Noise/sensitivity issues

- M. Haney

- 25 Feb 2004

## Open Issues (2)

- FISO temp/strain sensors
- Qualification at cryogenic temps
- Software Concerns
- System integration
- 3 more LakeShore 218’s
- Remote control of PC
- PCAnyWhere *vs* VNC
- Fermi network security policies...

- M. Haney

- 25 Feb 2004