[n] M. Won, J. G. Hong, S. J. Kim, J. W. Ok, and J. Y. Park, “Improvement of the Cryostat System Performance of 28-Ghz Electron Cyclotron Resonance Ion Source of the Biba by a Radiation Shielding”, presented at the ECRIS'20, East Lansing, MI, USA, Sep. 2020, paper WEWZO01, unpublished.
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