Published in Proceedings of the Cryogenic Engineering Conference and International Cryogenic Materials Conference: Chattanooga, TN, July 1, 2007, pages 284-290.
Copyright © 2007 American Institute of Physics. This article may be downloaded for personal use only. Any other use requires prior permission of the author and the American Institute of Physics. The following article appeared in Cryogenic Engineering Conference and International Cryogenic Materials Conference. and may be found at http://dx.doi.org/10.1063/1.2908559.
NOTE: At the time of publication, the author John Chen was not yet affiliated with Cal Poly.
The United States Navy has a continued interest in the development of High Temperature Superconductivity (HTS) to provide power dense, efficient propulsion and electrical power generation. These machines have large HTS rotor coils that will undergo many thermal cycles during the life of the ship. Thermal fatigue tests for large coils are necessary to understand any degradation and life issues that could arise. The Naval Surface Warfare Center Carderock Division (NSWCCD) has sponsored Rowan University to design and build a device that will assist in the thermal fatigue testing of a superconducting coil. It was designed to be autonomous with programmable cool down and warm-up rates and varying temperature from ambient temperature (300K) down to 77K. A typical test would include thermally cycling a coil a specified number of times, then performing a critical current test on the coil and repeating the test cycle as many times as desired. This paper introduces the thermal cycling test setup and presents preliminary calibration data.