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Rev Sci Instrum. 2014 Feb;85(2):02A915. doi: 10.1063/1.4828710.

Recondensation performance of liquid helium cryostat for a 28 GHz electron cyclotron resonance ion source.

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  • 1Busan Center, Korea Basic Science Institute, Busan 609-735, South Korea.
  • 2Center for Ionizing Radiation, Korea Research Institute of Standards and Science, Daejeon 305-340, South Korea.


Cryostat performance is essential for the stable operation of a superconducting magnet. A closed-cycle liquid helium cryostat was adopted for use for a superconducting electron cyclotron resonance (ECR) ion source by recondensing liquid helium vapor. The goal was to maintain the liquid helium filled reservoir at a constant level without transferring any liquid helium during the normal operation of the ECR ion source. To accomplish this, Gifford-McMahon (GM) refrigerators, which have two cold heads, were installed on the top of the cryostat. The cooling power of the GM cryocooler is 1.5 W at the second stage and 50 W at the first stage. Each stage was connected to the liquid helium reservoir, a radiation shield including high-Tc current lead, and related items. Before commissioning the ECR ion source, a preliminary evaluation of the recondensation performance was carried out with the magnet in partial operation. The design of the cryostat, its fabrication, and the experimental results are reported.

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