| Paper |
Title |
Page |
| TUT3AH5 |
Electron Cloud and Ion Effects and Their Mitigation in FCC-ee |
120 |
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- K. Ohmi, H. Fukuma, M. Tobiyama
KEK, Ibaraki, Japan
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Electron cloud and fast-ion instabilities are serious issues for colliders operated with high current and many bunches. We discuss the instabilities in FCC-ee/hh based on simulations and experiences of KEKB/SuperKEKB.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-eeFACT2016-TUT3AH5
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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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| WET1H3 |
Beam Instrumentation in SuperKEKB |
164 |
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- H. Fukuma
KEK, Ibaraki, Japan
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SuperKEKB is an upgraded collider of the KEK B-factory (KEKB). Its phase 1 operation has just finished in this June. A BPM system consists of super heterodyne detectors, turn by turn log-ratio detectors with fast gates and detectors for the orbit feedback to maintain stable collision. New X-ray beam profile monitors with multi-slit masks are installed. The bunch-by-bunch feedback system is upgraded using low noise frontend electronics and new 12 bits iGp digital filters. A status of instrumentations of SuperKEKB will be given in this talk.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-eeFACT2016-WET1H3
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| THS2H3 |
Summary of Beam Instrumentation and Beam Diagnostics Session |
220 |
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- H. Fukuma
KEK, Ibaraki, Japan
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This report is a summary of the beam instrumentation and beam diagnostics session of the eeFACT2016 workshop.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-eeFACT2016-THS2H3
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