CO2 cooling for HEP experiments [article]

Verlaat, M Van Beuzekom, A Van Lysebetten
2008
The new generation silicon detectors require more efficient cooling of the front-end electronics and the silicon sensors themselves. To minimize reverse annealing of the silicon sensors the cooling temperatures need to be reduced. Other important requirements of the new generation cooling systems are a reduced mass and a maintenance free operation of the hardware inside the detector. Evaporative CO 2 cooling systems are ideal for this purpose as they need smaller tubes than conventional
more » ... onventional systems. The heat transfer capability of evaporative CO 2 is high. CO 2 is used as cooling fluid for the LHCb-VELO and the AMS-Tracker cooling systems. A special method for the fluid circulation is developed at Nikhef to get a very stable temperature of both detectors without any active components like valves or heaters inside. This method is called 2-phase Accumulator Controlled Loop (2PACL) and is a good candidate technology for the design of the future cooling systems for the Atlas and CMS upgrades.
doi:10.5170/cern-2008-008.328 fatcat:qxpodmgjb5hota2ugb2ncmcoym