Cryogen-free dilution refrigerator for ACTPOL polarization- sensitive receiver

27th International Conference on Low Temperature Physics

Shvarts, V.^1 ; Zhao, Z.^1 ; Devlin, M.J.^2 ; Klein, J.^2 ; Lungu, M.^2 ; Schmitt, B.^2 ; Thornton, R.^2,3

Janis Research Company, LLC, 225 Wildwood Ave., Wobum

MA

01801, United States^1

Department of Physics and Astronomy, University of Pennsylvania, 209 S 33rd St., Philadelphia

PA

19104, United States^2

Department of Physics, West Chester University of Pennsylvania, 720 South Church St., West Chester

PA

19383, United States^3

关键词: Base temperature;    Dilution refrigerator;    Ethernet link;    Northern Chile;    Polarization sensitive;    Remote operation;    Site operations;    Transition-edge sensors;   

Others  :  https://iopscience.iop.org/article/10.1088/1742-6596/568/3/032016/pdf
DOI  :  10.1088/1742-6596/568/3/032016

来源: IOP

【 摘 要 】

We present a new cryogenic receiver for the Atacama Cosmology Telescope (ACT), a six-meter diameter off-axis Gregorian telescope located at an altitude of 5,200 meters (17,000 ft.) on Cerro Toco, in Northern Chile. The focal plane contains 3000 polarization-sensitive transition edge sensor (TES) bolometers, and is cooled to below 100 mK with a removable pulse-tube based customised JDry-100 dilution refrigerator insert. The optical tubes and the rest of the receiver are cooled with a dedicated pulse tube to below 3 K. Details of the receiver- to-telescope integration and first season on-site operation are described, including detector base temperature stability in vertical and tilted position as well as remote operation via Ethernet link.