A closed neon liquefier system for testing superconducting devices

Bianchetti, M., Al-Mosawi, M. K., Yang, Y., Beduz, C. and Guinchi, G. (2005) A closed neon liquefier system for testing superconducting devices. Cryogenic Engineering Conference and the International Cryogenic Materials Conference, Colorado, USA. 28 Aug - 01 Sep 2005. pp. 1-4 .

Abstract

A Neon Liquefier system has been developed by Southampton University (UK) and EDISON (Italy) with the aim to provide a facility for testing HTS superconducting devices, in particular Magnesium Diboride materials, in the range 26K-30K. The system consists of a liquid Neon cryostat, a 2 stages cryocooler, liquefier and a recovery system. The first stage of the cryocooler is connected to a thermal shield and a copper station positioned at mid point along the access neck of the cryostat to reduce heat leak and to provide pre-cooling of samples. The second stage, capable of 20W cooling power at 22K, is used to provide the cooling power for liquefaction and to control the bath temperature during the steady state operation. The cryostat has a capacity of 3 litres of liquid Neon with the advantage of top and bottom access to the liquid chamber and the possibility of a 5cm diameter warm bore arrangement. The recovery system has been designed to automatically compress excess boil-off generated by a quench or a transient heating into a storage gas container. Transport measurement up to 1000A can be carried out in the Ne cryostat using purposely build current leads. These leads have a copper upper section cooled by liquid Nitrogen and a superconducting bottom section of low conductivity Bi2223 tapes. In this paper we report on the performance of the system and the initial measurement of superconducting samples, in particular bulk, coils and tapes.

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Contributors

Author: Y. Yang

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