Cryogenic facilities

The LHe e-Bubble Chamber system comprise of the LHe e-Bubble Test Chamber and LHe/LN2 Cryostat. The LHe/LN2 Cryostat provides a low temperature of 4.2K environment, which contains the LHe test chamber and provides the helium vapor cooling (2.2~4.2K) to it. The LHe/LN2 Cryostat includes a vacuum chamber, a liquid helium service vessel, and a liquid nitrogen service vessel, which are disassembled to get access to the test chamber. Two radiation heat shields (80K and 4.2K) are thermally attached to the two vessels, respectively. The cryostat has two optical windows at the sides and one at the bottom of the vacuum chamber and each heat shield for radioactive sources, light transportation and optical measurements.
The e-Bubble test chamber is a double walled LHe vessel. Two copper cooling loops for the helium vapor-cooling circuits are welded on the flanges of the chamber. A needle valve in the Cryostat is used to supply and control the flow rate in the helium vapor-cooling circuits. The test chamber contains a plastic frame with high voltage poles (10kV). There are 10 high voltage cables (10kV each with negligible current) inserted from the bottom flange of the test chamber. Each SS conductor wire is electrically insulated by Teflon coating sleeve of 3mm in outside diameter. There are four low voltage ports on the top flange of the test chamber.
For more pictures, see LHe/LN2 Cryostat and Liquid Argon Cryostat.