| Title |
Design and Fabrication of a Conductively Cooled Cryostat by Cryocooler |
| Authors |
배준환(Bae, Joon-Han) ; 심기덕(Sim, Ki-Deck) |
| Keywords |
Critical current ; AC loss ; high temperature superconductor ; cryocooler cooled cryostat ; temperature control feedback |
| Abstract |
In order to measure the superconducting transition temperature, the critical current and the alternating current(AC) loss on short samples of high temperature superconductor, a cryocooler cooled cryostat has been designed and built. Two closed-cycle coolers provide cooling with an ultimate sample temperature below 16K. Temperature regulation is provided by 50W of electrical heater that opposes the cooling power from the cold heads. Temperature control feedback is by means of a cernox temperature sensor co-located with the heaters on the second stage of the cold head. Additional temperature sensors are located on the sample mount(B1), on the CVI cold head(B2) and on the Dakin cold head(B3). AC losses on the sample high temperature superconductor were measured at 30K so that the developed device performance was evaluated. In this paper, the design, fabrication and test results on the cryocooler cooled cryostat are presented. |