MICE LH2 Absorber Instrumentation - What is necessary/ desirable? (physics calibration) Temperature inside the the absorber Temperature inside the absorber.

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Presentation transcript:

MICE LH2 Absorber Instrumentation - What is necessary/ desirable? (physics calibration) Temperature inside the the absorber Temperature inside the absorber vacuum Pressure on the LH2 outlet Optical occlusion methods (laser or non-laser) - Controls (questions of data acquisition ) Safety systems (at Fermilab “quadlog” system is standard) Event read-out Data acquisition - Design considerations (depends on the final dimensions, routs, ports) LH2/flammable gas safety Clearance and strain relief Feedthroughs to outside electronics Noise cancellation/shielding

Electronics 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 at UIUC for Mucool(and a spare) Will need to consider (re)calibration protocols –Annually?

Electronics (2) CX-1030-SD Cernox RTD sensors (12) –-10  /K at 20K (estimated from plots) –Better suited for lower temperatures –Recommended for use in magnetic fields (B<19T) –Rad hard CX-1050-SD Cernox RTD sensors (24) –-70  /K at 20K (estimated) –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…

Electronics (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 –+/  ; 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…

Optical Occlusion Can be used as a threshold for occlusion or clearance Baumer electronics laser distance sensor is one candidate Test set-up at NIU:

Signal transfer 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 MICE grounding scheme –Common mode (surges) due to magnets Need to protect electronics without burning barriers –Noise/sensitivity issues

Feedthroughs Vacuum compatible, electrically insulated –Have to decide pin configuration based on 2, 4 wire readouts –MDC Vacuum Products Corp Vacuum/air Cryo/air Temp –Port through LH2 or vacuum