Second stage cooling from a Cryomech PT415 cooler at second stage temperatures up to 300 K with cooling on the first-stage from 0 to 250 W

Cryogenic Engineering Conference 2015

材料科学;物理学

Green, M.A.^1,2 ; Chouhan, S.S.^1 ; Wang, C.^3 ; Zeller, A.F.^1

FRIB, Michigan State University, East Lansing

MI

48824, United States^1

Lawrence Berkeley Laboratory, M/S0161, Berkeley

CA

94720, United States^2

Cryomech Inc., 113 Falso Drive, Syracuse

NY

13211, United States^3

关键词: Down time;    Similar datum;    Stage cooling;    Temperature range;    Two-stage coolers;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/101/1/012002/pdf
DOI  :  10.1088/1757-899X/101/1/012002

学科分类：材料科学（综合）

来源: IOP

【 摘 要 】

The amount of cooling delivered to the second stage of a two stage cooler is dependent on the second stage temperature and the amount of refrigeration provided by the cooler first stage. The second stage cooling as a function of temperature for a Cryomech PT-415 cooler (1.5 W at 4.2 K with 42 W on the first stage) has been estimated by scaling similar data that was measured for a Cryomech PT-410 cooler (1.0 W at 4.2 K with 28 to 30 W on the first stage). In order to accurately calculate the cool-down time for a superconducting magnet using PT-415 K coolers one must know how much cooling can be delivered by the cooler second-stage as a function of the second-stage temperature and the added cooling delivered to the cooler first-stage. There are applications where PT415 coolers are used in the temperature range from 15 to 25 K to liquefy hydrogen or cool magnets fabricated from MgB2. This report describes the method for estimating the cooler performance for a PT415 cooler as well as the results of the measurements on several PT415 coolers.