MuCool Test Facility
Instrumentation Update
M. Haney, D. Errede,
Z. Conway
University of Illinois at Urbana-Champaign
12/13 August 2002
Instrumentation
• Seeking an intrinsically safe solution for
instrumenting the LH2 absorber in the MTF
– Prudent to accommodate MICE
and European safety considerations
– i.e. do it right the first time…
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Objective - Safety
• Intrinsic safety, if possible
– Limited power per channel
• Good idea for Fermi; required for Europe
• Gas-purged enclosure, if necessary
– 19” rack, 40U tall
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Instrumentation (1)
• Lakeshore 218S
– 8 channel cryo temperature monitor
• +/- 21m K at 10 K
– 16 readings/s
– GPIB interface (to PC)
• TG-120PL GaAlAs diodes (8)
– -180mV/K at 4.2 K
– B < 5 T; rad hard
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Instrumentation (2)
• 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
– +/- 500 me; 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…
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Instrumentation (3)
• 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 Smart UPS
– 3000 VA
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Instrumentation (4)
• IRM
– 64 channel multiplexed ADC
• 16 bit, 100 Ksamples/s
– ACNET network connection
• All PC data will be posted to IRM for ACNET
access
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Instrumentation (5)
• MTL7055ac barriers
– Low level AC
• 24 W per line
• 3 V max
• MTL7060ac barriers
– Star-connected AC
• 101 W per line
• 8.5 V max
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(basic) Barrier
fuse
Power
+
Signal
“safe circuit”
Return
Ground
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Signals inside (the cryostat)
• 8 (cryo) temperatures
– readout via GPIB + LabView (PC)
• Multiple fibers
– FISO strain, temperature (4)
• Pressure, flow?
– Laser occlusion (2)
– Simple spark detectors (2)
• (light pipe to photodiode)
• 25(ish) 4-wire bolometry strips
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(more) Signals inside
• Piezo vibration sensor
– via (16 chan/12 bit) ADC and LabView (PC)
• Local (64 chan/16 bit) IRM channels
– via “LabView” (see last slide)
• MICE channels (?)
– placeholder for the future…
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Signals outside
• USB (4 wires, and shield) for CCD camera and
microphone
– via PC
• Many voltages, currents, temperatures, pressures
– magnets, beam position monitors, etc.
– Most available from ACNET or local IRM
• via “LabView” (see last slide)
– or Cyro-PLC
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Two Possibilities (1)
• Intrinsically safe
Hazard Safe
Sealed
Conduit(s)
Barrier(s)
IRM
ACNET
Cryo(temp)
FISO
PC w/16 chan
ADC
Intrinsically safe signal conditioners
and transmitters
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UPS
network
power
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Two Possibilities (2)
• Gas-purged box
Hazard Safe
Barrier(s)
Sealed
Conduit(s)
ACNET
IRM
Cryo(temp)
FISO
PC w/16 chan
ADC
power
UPS
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network
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This Summer – Z. Conway
• LabView interface
– GPIB to cryo temp monitor - works
– PC-internal ADC (e.g. for piezo) – “works”
• Simple ADC data read - works
• High rate collection and compression – not yet
– IRM communications
• IRM-ADC Read - works
• Write – any moment now…
• Integration – remains!
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Open Issues
• Wire+Shielding Concerns
– Noise/sensitivity issues due to
wire+barrier resistance?
• Approx 12 W /ft for 36 AWG manganin wire
• 48 W to 202 W added by barrier
– And diode capacitance…
– Common mode (surges) due to magnets?
• Need to protect electronics without burning barriers
– Cable plant into solenoid
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Open Issues (2)
• Software Concerns
– Posting data to the IRM
• For ACNET access
– Reading data from ACNET
• For PC access
– Remote control of PC
• Citrix ICA, PCAnyWhere, etc.
• LabView web-remote instrumentation
• KVM?
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Open Issues (3)
• FISO strain and temp sensors
– Not official rated below -40 C (!)
– Temp has been used at 35 K (custom)
• No experience with strain gages
– Company very willing to work with us
• To adjust signal conditioner, correction curves, etc.
• Will require some form of agreement
– Confidentiality, exclusivity for the instrument
– Yet freedom to use and publish measurements
– Also pressure, flow?
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