Cooling Test Results on fuzzy carbon substrate Setup in Lotima Room Used water/glycol mix (70/30 by wt) Neslab chiller to set temp Small pump to get the flow rate Flow-meter calibration to the mixture Hydrometer to check density of mix Filter, insulator, glove box(dry N2) SMT resistors as heaters 4 wire RTDs to readout temperature (5 points; water inlet and outlet line, fuzzy carbon surface-entry,notch, exit) Also monitor pressure drop, absolute pressure of inlet Haven’t used laser to monitor vibration

Problems Sensitive to humidity and ambient temperature (do it in vacuum vessel) Two of the RTDs’ need to be re-calibrated (temporary fix; need more RTDs) Lack of pumping power, flow rate just above 1.4 L/min (new pump) Inside glove box – hard to manoeuvre and fix things (new plexi-glass box) Fuzzy carbon very fragile – so far only populate 1 side (starting to populate the other side) Measure temperature only outside the coupling piece on the inlet and outlet of coolant line

Results Sharon, Steve, Tim et al with the setup and test Vacuum vessel – PAB; empty vessel pumped down to 1x10 -9 torr. Plan to put in the fuzzy carbon substrate soon to see how good a vacuum we can get A lot of results; take time to digest Here only show highlights of some results

Highlights Too good to be true! I had a hard time to believe the results because the differences in the RTD readings between HEAT OFF and ON are so small. HEAT ON- 10.2W (RTD 1-5 ) ; no coolant | | HEAT ON; coolant ON and chiller at 0C 7.52 | | 7.94 HEAT OFF; coolant ON and chiller at 0C 7.56 | | 7.91