Evaporative CO2 is a very interesting cooling fluid for particle detectors and perhaps other scientific instruments. The cooling pipes needed for CO2 are significantly smaller than the pipes needed for other refrigerants. The heat and mass transfer properties of CO2 are very good.
CO2 is applied successfully in the LHCb-VELO and AMS-Tracker experiments.
Both systems use the Nikhef developed 2PACL (2-Phase Accumulator Controlled Loop) method for circulating and conditioning the CO2 in the experiments.
This method allows for a high temperature stability in the detector and
is relatively easy to build and control.
This seminar will show the benefits of using CO2. It will show the test results from the LHCb and AMS detector. It will also show the future plans we have with CO2 cooling for upgrade or new high energy physics detectors.