High level gamma radiation effects on Cernox? cryogenic temperature sensors

Cryogenic Engineering Conference 2017

材料科学;物理学

Courts, S.S.^1

Lake Shore Cryotronics, Inc., 575 McCorkle Blvd., Westerville

OH

43082, United States^1

关键词: Cryogenic temperatures;    Cryogenic thermometers;    Equivalent resistance;    Equivalent temperature;    High-energy particles;    Increasing temperatures;    Resistance thermometers;    Superconducting RF cavity;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/278/1/012076/pdf
DOI  :  10.1088/1757-899X/278/1/012076

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

Cryogenic temperature sensors are used in high energy particle colliders to monitor the temperatures of superconducting magnets, superconducting RF cavities, and cryogen infrastructure. While not intentional, these components are irradiated by leakage radiation during operation of the collider. A common type of cryogenic thermometer used in these applications is the Cernox™ resistance thermometer (CxRT) manufactured by Lake Shore Cryotronics, Inc. This work examines the radiation-induced calibration offsets on CxRT models CX-1050-SD-HT and CX-1080-SD-HT resulting from exposure to very high levels of gamma radiation. Samples from two different wafers of each of the two models tested were subjected to a gamma radiation dose ranging from 10 kGy to 5 MGy. Data were analysed in terms of the temperature-equivalent resistance change between pre- and post-irradiation calibrations. The data show that the resistance of these devices decreased following irradiation resulting in positive temperature offsets across the 1.4 K to 330 K temperature range. Variations in response were observed between wafers of the same CxRT model. Overall, the offsets increased with increasing temperature and increasing gamma radiation dose. At 1.8 K, the average offset increased from 0 mK to +13 mK as total dose increased from 10 kGy to 5 MGy. At 4.2 K, the average offset increased from +4 mK to +33 mK as total dose increased from 10 kGy to 5 MGy. Equivalent temperature offset data are presented over the 1.4 K to 330 K temperature range by CxRT model, wafer, and total gamma dose.