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Report No.
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Magnetic field shielding by vacuum chambers of magnetic material for beam loss reduction

Kamiya, Junichiro   ; Ogiwara, Norio; Hayashi, Naoki  ; Hotchi, Hideaki  ; Yoshimoto, Masahiro  ; Kinsho, Michikazu  

It is necessary to reduce the beam loss in the high power beam accelerators. One of the reasons of the beam loss is the leakage magnetic field from the beam line magnet, which distorts the beam orbit and makes the beam hit the wall of the beam pipe. The most effective way to shield such leakage field is to cover the beam by the magnetic materials at the nearest space. We decided to apply this method to the vacuum chambers of the straight section of the J-PARC 3 GeV synchrotron, where the effect of the leakage magnetic field to the beam orbit is evident. However, there is few proven evidence of the vacuum chambers of the magnetic material. Therefore we clarify the problems in producing vacuum chambers and bellows, which satisfy the magnetic and vacuum performance. In this article, we deliver the over view of the magnetic shielding project and our approaches to the problems in producing the vacuum chambers of new material.

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