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Report No.
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Vacuum improvement of kicker magnet area in J-PARC 3 GeV synchrotron

Kamiya, Junichiro  ; Yanagibashi, Toru; Ogiwara, Norio; Kinsho, Michikazu 

In this study, we propose a new in situ degassing method by which only kicker magnets in the accelerator beam line are baked out without raising the temperature of the vacuum chamber to prevent unwanted thermal expansion of the chamber. By simply installing the heater and thermal radiation shield plates between the kicker magnet and the chamber wall, most of the heat flux from the heater directs towards the kicker magnet. The result of the verification test showed that each part of the kicker magnet was heated to above the target temperature with a small rise in the vacuum chamber temperature. The outgassing rage was reduced to one tenth comparing to the case without bake out.

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