Applicability of ASST-A helium refrigeration system for JLab End Station Refrigerator

Cryogenic Engineering Conference 2017

材料科学;物理学

Hasan, N.^1 ; Knudsen, P.^2 ; Ganni, V.^2

Thomas Jefferson National Accelerator Facility, Newport News

VA

23606, United States^1

Facility for Rare Isotope Beams (FRIB), Michigan State University (MSU), East Lansing

MI

48824, United States^2

关键词: Cryogenic system;    Helium refrigeration systems;    High-power target;    Jefferson Lab;    Liquid hydrogen target;    Refrigeration system;    Superconducting Super-Collider;    Varying load conditions;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/278/1/012114/pdf
DOI  :  10.1088/1757-899X/278/1/012114

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The MOLLER experiment at Jefferson Lab (JLab) is a high power (5 kW) liquid hydrogen target scheduled to be operational in the 12 GeV-era. At present, cryogenic loads and targets at three of JLab's four experimental halls are supported by the End Station Refrigerator (ESR) - a CTI/Helix 1.5 kW 4.5 K refrigerator. It is not capable of supporting the high power target load and a capacity upgrade of the ESR cryogenic system is essential. The ASST-A helium refrigeration system is a 4 kW 4.5 K refrigerator. It was designed and used for the Superconducting Super Collider Lab (SSCL) magnet string test and later obtained by JLab after the cancellation of that project. The modified ASST-A refrigeration system, which will be called ESR-II along with a support flow from JLab's Central Helium Liquefier (CHL) is considered as an option for the End Station Refrigerator capacity upgrade. The applicability of this system for ESR-II under varying load conditions is investigated. The present paper outlines the findings of this process study.