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A turbo molecular pump which can be operated when exposed to high radiation has been under development at Japan Atomic Energy Research Institute (JAERI) and Osaka Vacuum Ltd., for use in the 3 GeV-RCS of the J-PARC project. The target irradiation dose is 30 MGy. In order to determine the extent of radiation damage to the pump, gamma-ray irradiation testing was performed at JAERI. It was found that the turbo molecular pump could operate properly when given an absorption dose less than 3.5 MGy in a gamma-ray irradiation environment. Since the elasticity of elastomer vacuum seals decreases when exposed to radiation, leaks occur. Other components, for example motor coil, control sensor, etc., retained their high performance even when given more than a 7 MGy absorption dose. The outgassing rate of the cable was measured before and after irradiation. |
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