Thermalization of a SQUID chip at cryogenic temperature: Thermal conductance measurement for GE 7031 Varnish Glue, Apiezon N Grease and Rubber Cement between 20 and 200 mK

Abstract

In the context of the ATHENA X-IFU Cryogenic AntiCoincidence Detector (CryoAC) development, we have studied the thermalization properties of a 2mm x 2mm SQUID chip. The chip is glued on a front-end PCB and operated on the cold stage of a dilution refrigerator (TBASE < 20 mK). We performed thermal conductance measurements by using different materials to glue the SQUID chip on the PCB. These have been repeated in subsequent cryostat runs, to highlight degradation effects due to thermal cycles. Here, we present the results obtained by glues and greases widely used in cryogenic environments, i.e. GE 7031 Varnish Glue, Apiezon N Grease and Rubber Cement.

Accepted for publication in the Journal of Low Temperature Physics for LTD-20 special issue

References in corpus (2)

• The TES-based Cryogenic AntiCoincidence Detector (CryoAC) of ATHENA X-IFU: a large area silicon microcalorimeter for background particles detection
• Opening the low-background and high-spectral-resolution domain with the ATHENA large X-ray observatory: Development of the Cryogenic AntiCoincidence Detector for the X-ray Integral Field Unit