7-14-06 RLSCamera Cooling1 Camera Cooling Discussion Richard L. Schmitt Fermilab July 14, 2006.

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Presentation transcript:

RLSCamera Cooling1 Camera Cooling Discussion Richard L. Schmitt Fermilab July 14, 2006

RLSCamera Cooling2 Cryo Coolers or Liquid Nitrogen?

RLSCamera Cooling3 Heat Load Focal Plate Supports: 10 Watts CCD’s: 20 Watts Wiring and Cables: 25 Watts Radiative heat load: 70 Watts Add safety factor Total heat load: 200 Watts

RLSCamera Cooling4 Location of Cryo Coolers

RLSCamera Cooling5 Cryo Cooler Types Cryo- Cooler System Type # of units required Orientation DependantVibration Operating temperature Operational Considerations Cryo-Tiger (JT)9No No moving parts; No pressure pulsation120 K Note negative APO experience; Several units required CryoMech (PT)4Yes+/ Hz 77 K in vertical position Multiple units required; Performance dependant on orientation CryoMech (GM01No +/ Hz77 K High vibration level

RLSCamera Cooling6 Vibration (sources) Cryocoolers used for CLIO, LEGT, CDMS –Vibration of Camera Caused by Cryo-Cooler, Zhijing Tang, August –Vibration Analysis of Cryocoolers, Tomaru, Takayuki, et al –Current status of large-scale cryogenic gravitational wave telescope. K Kuroda, et al. August –Low-Noise Cooling of HT-SQUIDS by Means of a Pulse Tube Cooler with Additional Vibration Compensation. Lienerth, Thummes and Heiden –Design and Construction status of CLIO. M Ohashi, et al. August –Vibration-Free Pulse Tube Cryocooler System for Gravitational Wave Detectors I. T Tomaru, et al. –Large-Scale Cryogenic Gravitational Wave Telescope. K Kuroda, et al

RLSCamera Cooling7 Vibration Isolation can reduce vibrations at detector to near seismic levels GM more vibration below 15 Hz than Pulse Tube Motions under 0.2 Mm- Per Z.T., 50 lb at 2.4 Hz CDMS Isolation –Support –Vacuum bellows –Braids –Wire bundles –GM vibration reduced by factor of 80

RLSCamera Cooling8 CDMS Flat braid on first stage Vacuum bellows 0.2 inches motion along Estem axis 20,000 wires,.0005 inch diameter

RLSCamera Cooling9 Cryocooler Costs TypeModel ReferencePower Consumption CapacityCost PTCryoMech PT603.0 kW60 77K$50 K JTIGC Polycold CryoTiger 0.5 kW3.5 77K$137 K GMCryoMech AL kW300 77K$29 K

RLSCamera Cooling10 Nitrogen Batch Filling

RLSCamera Cooling11 Circulation