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Description
At the Taiwan Photon Source (TPS) a cryogenic permanent magnet undulator, CUT18, utilizes the latent heat of vaporization of liquid nitrogen for magnet cooling. After a period of operation, some condensed water, which caused rust at the structure of CUT18, appeared at the flange connecting the cooling system and the vacuum beam chamber of CUT 18. This condensed water was mainly due to deterioration of the thermal insulation vacuum of the liquid nitrogen cooling system. Moreover, the period became much shorter after the maintenance to recover a proper vacuum under cold conditions. This paper presents the efforts to extend the period of sustaining a proper thermal insulation vacuum without the appearance of condensed water. A residual gas analyzer was used to study outgases from the insulation vacuum of the liquid nitrogen cooling system at warm and cold conditions. These efforts succeed to extend the period longer than three months, thus greatly reduced the burden from insulation vacuum maintenance.
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