Construction and Testing of a Low-power Cryostat for MARS

Aalseth, Craig E. ; Caggiano, Joseph A. ; Day, Anthony R. ; Fast, James E. ; Fuller, Erin S.

关键词: AERIAL MONITORING;    CONSTRUCTION;    COPPER;    CRYOSTATS;    EMISSIVITY;    GERMANIUM;    HIGH-PURITY GE DETECTORS;    NITROGEN;    PASSIVATION;    PLATINUM;    RADIATION DETECTORS;    RADIATION MONITO;   

DOI  :  10.2172/1027195
RP-ID  :  PNNL-16922
PID  :  OSTI ID: 1027195
Others  :  Other: NN2001000
Others  :  TRN: US1105696

美国|英语

来源: SciTech Connect

【 摘 要 】

A low-power cryostat was designed and built for the Multi-sensor Airborne Radiation Survey (MARS) project for the purpose of housing a close-packed high-purity germanium (HPGe) detector array of 14 HPGe detectors. The power consumption of the cold mass in the cryostat was measured to be 4.07(11) watts, sufficient for 5.5 days of continuous operation using only 8 liters of liquid nitrogen. Temperatures throughout the cryostat were measured by platinum resistance temperature detectors. These measurements were used to determine the emissivity of the copper used in the floating radiation shield and outer cryostat wall, which was constructed using chemically cleaned and passivated copper metal. Using a PNNL-developed passivation process, an emissivity of 2.5(3)% was achieved for copper.