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SiPM cooling
Hi Elton et al:
following the meeting with SensL last month, we were asked to investigate the following, in connection to the cooling of the 4x4 Sensor Arrays (SA), each consisting of 16 3x3mm2 cells.
1. What are the plans for the control of temperature and humidity in Hall-D? This is a civil engineering question. Can you point us to info on this? SensL brought up the number of <15% humidity in the Hall. Is this achievable, and if not can it be made a goal?
2. 'Global cooling' of all 4224 SAs for the BCAL was discussed. What are thoughts from JLab engineers on this? Can we achieve air flow, nitrogen flow, or water cooling over the SA region? We are talking about a doughnut-shaped enclosure for gas flow, and something else for liquid flow. Also, above dew point and below dew points options should be discussed. With SensL we are working towards a above dew point option, which will still provide us with a factor ~5 decrease in the DR from cooling.
Cooling individual SAs is expensive. SensL gave us a number of US$200 per SA (not firm, just approximate at this stage) for *bare* SAs. Adding the cooling and TEC to this, adds another US$160 to the price. Clearly, there is strong motivation from cost (and complexity) in pursuing a global cooling solution. JLab needs to take the lead on this, since Regina has no engineering expertise.
Cheers, Zisis...
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From Padraig:
In answer to your question, the energy dissipation from the detector is
minimal - 300uW based on a 30V bias with upto say 10uA current draw.
This scales with number of detectors.
For the electronics
At room temp 6-7mA of current draw at 5V gives about 60mW
Cooled this goes up by an order of magnitude.
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