Speaker
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 condense water, which caused rust at the structure of CUT18, appeared at the flange connecting to the vacuum beam chamber of CUT 18. This condense water was considered 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 condition. This paper presents the efforts to extend the period of sustaining a proper thermal insulation vacuum with no appearance of condense water. RGA is used to study outgases from insulation vacuum of the liquid nitrogen cooling system at warm and cold conditions. Position of the copper cooling bar, which is used to transfer the heat load from the permanent magnets to the liquid nitrogen cooling tank, is fine tuned to increase the cold spot temperature at the flange surface. After these exertions the burden of insulation vacuum maintenance is reduced and acceptable for current limited manpower.
Footnotes
*: https://doi.org/10.1103/ysbx-qqsc
| In which format do you inted to submit your paper? | Word |
|---|