1. Camera Cooling with Pumped Liquid Nitrogen Richard Schmitt 8/7/06

2. August 7, 20062 Simplified Flow Diagram Off-Telescope Liquid Nitrogen Vessel Camera Heat Exchanger Pump

3. August 7, 20063 Advantages No reservoir on telescope No sensitivity to orientation No mechanical vibration Straightforward engineering design Simple operation Can be run at 100K Cryocooler vs. tanker supply is economics

4. August 7, 20064 Disadvantages Additional 60 watts of heat Cost of pumps about $25k each Possible separator needed on telescope

5. August 7, 20065 Development Tasks Need plan and elevation of telescope & dome Need maximum tanker supply pressure Need power and nitrogen costs Analyze two-phase flow, size pipes Design heat exchanger Draw Piping Diagram Assemble and test at Fermilab

6. August 7, 20066