June 28, 2015 to July 2, 2015
JW Marriott Starr Pass Resort
Etc/GMT-7 timezone

Second stage Cooling from a PT-415 Cooler at Second-stage Temperatures up to 125 K with Heat Loads on the First-stage from 0 to 60 W

Jun 29, 2015, 11:15 AM
Tucson Ballroom E

Tucson Ballroom E

Contributed Oral Presentation CEC-03 - Cryocoolers (Non-Aerospace) C1OrA - Cryocoolers for Superconducting Applications


Michael Green (Michigan State University)


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 PT415 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 PT410 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 PT415 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 22 K to cool and liquefy hydrogen. This report describes the method for measuring the cooler performance as well as the results of the measurements.

Primary author

Michael Green (Michigan State University)


Al Zeller (Michigan State Univ.) Dr Shailendra Chouhan (Michigan State University)

Presentation materials