28 June 2015 to 2 July 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

29 Jun 2015, 11:15
15m
Tucson Ballroom E ()

Tucson Ballroom E

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

Speaker

Michael Green (Michigan State University)

Description

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)

Co-authors

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

Presentation Materials