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Camera Cooling Discussion

Camera Cooling Discussion. Richard L. Schmitt Fermilab July 14, 2006. Cryo Coolers or Liquid Nitrogen?. 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.

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Camera Cooling Discussion

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

  2. Cryo Coolers or Liquid Nitrogen? Camera Cooling

  3. 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 Camera Cooling

  4. Location of Cryo Coolers Camera Cooling

  5. Cryo Cooler Types Camera Cooling

  6. Vibration (sources) • Cryocoolers used for CLIO, LEGT, CDMS • Vibration of Camera Caused by Cryo-Cooler, Zhijing Tang, August 10 2004. • Vibration Analysis of Cryocoolers, Tomaru, Takayuki, et al. 2004. • Current status of large-scale cryogenic gravitational wave telescope. K Kuroda, et al. August 18 2003 • Low-Noise Cooling of HT-SQUIDS by Means of a Pulse Tube Cooler with Additional Vibration Compensation. Lienerth, Thummes and Heiden. 2000. • Design and Construction status of CLIO. M Ohashi, et al. August 7 2003. • 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. 1999. Camera Cooling

  7. 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 Camera Cooling

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

  9. Cryocooler Costs Camera Cooling

  10. Nitrogen Batch Filling Camera Cooling

  11. Circulation Camera Cooling

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