Cryogenic Design Considerations of Solid Argon Calorimeters and Performance of a Solid Argon Test Cell
This paper presents the cryogenic design and discusses the operation of a small test cell with a 20.6 L cryostat, built to demonstrate the feasibility of Solid Argon Calorimeters (SAC) for possible use in high energy physics experiments. In addition, design considerations for a large SAC are described. The test cell froze argon in a solid block around the particle detector assembly reaching temperatures more than 6 K below the argon freezing temperature. Aspects of the test cell design can be used for a large SAC including the use of two liquid nitrogen cooling circuits; one for condensing argon gas and controlling the argon pressure, another for freezing the argon around the detector assembly with gravity fed liquid nitrogen at 77 K. An insulated open-top box surrounding the detector assembly separated the solid argon from warmer liquid argon restricting the growth of the solid argon. A generalized look is taken at the heat transfer problems of a SAC.
KeywordsHeat Exchanger Test Cell Detector Module Liquid Argon Natural Convection Heat Transfer
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