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Title |
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| TUT3AH6 |
Electron Cloud at SuperKEKB |
125 |
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- H. Fukuma, K. Ohmi, Y. Suetsugu, M. Tobiyama
KEK, Ibaraki, Japan
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Several countermeasures such as ante-chambers, TiN coating, clearing electrodes, grooved structure and so on, have been taken to mitigate the electron cloud effects in the SuperKEKB positron ring. During phase 1 operation of SuperKEKB, which continued from this February to June, the electron cloud effects such as beam size blow-up, non-linear pressure increase, betatron tune shift along a bunch train and transverse coupled bunch instability were observed. Permanent magnets attached at bellows that generate longitudinal magnetic field in vacuum chambers were effective to reduce the electron cloud. This talk will cover following subjects about the electron cloud at SuperKEKB, 1) mitigation methods against the electron cloud, 2) observation of the electron cloud effects in phase 1 operation and 3) plan of further reduction of the electron cloud toward phase 2 operation which will start in the late FY2017.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-eeFACT2016-TUT3AH6
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