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Title |
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| MOAL03 |
Beam Commissioning of SuperKEKB Rings at Phase 1 |
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- M. Tobiyama, M. Arinaga, J.W. Flanagan, H. Fukuma, H. Ikeda, H. Ishii, K. Mori, E. Mulyani, M. Tejima
KEK, Ibaraki, Japan
- G. Bonvicini
Wayne State University, Detroit, Michigan, USA
- E. Mulyani
Sokendai, Ibaraki, Japan
- G.S. Varner
University of Hawaii, Honolulu,, USA
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The Phase 1 commissioning of SuperKEKB rings with-out superconducting final focus magnets or Belle-II de-tector began in Feb., 2016. A total of 1010 mA (LER) and 870 mA (HER) stored beam has been achieved close to the design emittance and x-y coupling. Most of the beam diagnostics, including new systems such as gated turn-by-turn monitors and X-ray beam size monitors, have been commissioned with beam and proved to be essential to the success of machine commissioning. The results of the beam commissioning, including the evaluation and diffi-culties of the beam diagnostics are shown.
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Slides MOAL03 [9.607 MB]
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| DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IBIC2016-MOAL03
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| TUAL03 |
Beam Loss and Abort Diagnostics during SuperKEKB Phase-I Operation |
282 |
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- H. Ikeda, J.W. Flanagan, H. Fukuma, T. Furuya, M. Tobiyama
KEK, Ibaraki, Japan
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Beam commissioning of SuperKEKB Phase-I started in Feb., 2016. In order to protect the hardware components of the accelerator against unstable Ampere class beams, the controlled beam abort system was upgraded. Because of the higher beam intensity and shorter beam lifetime than at the original KEKB, a beam abort monitor system is important for machine tuning and the safety of the components. The system collected the data of all aborts of more than 1000 in this operation period, and we diagnosed not only the hardware performance but the tuning software by analyzing the relations between beam current, loss monitor signals and RF cavity voltages. This paper will give the outline of the monitoring system, and will present typical examples of signal and diagnoses.
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Slides TUAL03 [25.716 MB]
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| DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IBIC2016-TUAL03
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| TUPG13 |
A New Stripline Kicker for PF-AR Transverse Feedback Damper |
344 |
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- R. Takai, T. Honda, T. Nogami, T. Obina, Y. Tanimoto, M. Tobiyama
KEK, Ibaraki, Japan
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A feedback damper equipped with a long stripline kicker was used to damp transverse beam oscillation at the Photon Factory Advanced Ring (PF-AR), which is a 6.5-GeV synchrotron radiation source of KEK. Recently, the stripline kicker was renewed to one having shorter electrodes and a smaller loss factor because its insulating support was broken by the beam-induced thermal stress and caused frequent electric discharges inducing dust trapping phenomena. In this paper, we present details of the new stripline kicker, from design to installation, as well as demonstrate results of beam oscillation damping obtained with the new kicker.
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| DOI • |
reference for this paper
※ DOI:10.18429/JACoW-IBIC2016-TUPG13
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