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| MOOB01 |
Beam Commissioning of SuperKEKB Rings at Phase-2 |
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- M. Tobiyama, M. Arinaga, J.W. Flanagan, H. Fukuma, H. Ikeda, H. Ishii, S.H. Iwabuchi, G.M. Mitsuka, K. Mori, 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 2 commissioning of SuperKEKB rings with Belle II detector began in Feb. 2018. Staring the commissioning of positron damping ring (DR), the injection and storage of the main rings (HER and LER) smoothly continued in Apr., 2018. The first collision has been achieved on 26th Apr. with the detuned optics (200 mm x 8 mm). Performance of beam instrumentation systems and the difficulties encountered during commissioning time will be shown.
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Slides MOOB01 [11.232 MB]
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IBIC2018-MOOB01
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| About • |
paper received ※ 05 September 2018 paper accepted ※ 11 September 2018 issue date ※ 29 January 2019 |
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| MOPA02 |
Beam Diagnostics for SuperKEKB Damping Ring in Phase-II Operation |
29 |
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- H. Ikeda, M. Arinaga, J.W. Flanagan, H. Fukuma, H. Ishii, S.H. Iwabuchi, G.M. Mitsuka, K. Mori, M. Tejima, M. Tobiyama
KEK, Ibaraki, Japan
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The SuperKEKB damping ring (DR) commissioning started in February 2018, before main ring (MR) Phase-II operation. We constructed the DR in order to deliver a low-emittance positron beam. The design luminosity of SuperKEKB is 40 times that of KEKB with high current and low emittance. A turn-by- turn beam position monitor (BPM), transverse feedback system, synchrotron radiation monitor (SRM), DCCT, loss monitor using ion chambers, bunch current monitor and tune meter were installed for beam diagnostics at the DR. An overview of the instrumentation and status will be presented.
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IBIC2018-MOPA02
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| About • |
paper received ※ 05 September 2018 paper accepted ※ 14 September 2018 issue date ※ 29 January 2019 |
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| WEOC02 |
Review of Recent Status of Coded Aperture X-ray Monitors for Beam Size Measurement |
361 |
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- J.W. Flanagan
KEK, Ibaraki, Japan
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Funding: US-Japan Cooperation in High Energy Physics (Japan Monbukagakusho and US DOE). Kakenhi.
X-ray beam profile monitors based on coded aperture imaging use an array of pinholes or slits to achieve large open apertures, which provide improved photon collection efficiency over single pinholes or slits. The resulting improvement in photon statistics makes possible single-bunch, single-turn measurements at lower bunch currents than are possible with a single pinhole or slit. In addition, the coded aperture pattern provides extra information for beam profile reconstruction, which makes possible somewhat improved resolution, as compared to a single slit. The reconstruction algorithm for coded aperture imaging is more complicated and computing-intensive than that for a single slit, though with certain classes of coded pertures a faster reconstruction method is possible. This talk will provide a survey of efforts to use coded aperture imaging for beam profile diagnostics at accelerators to date, covering principles and practical experiences with the technique, as well as prospects for the future at SuperKEKB, where it forms the primary means of measuring vertical beam sizes.
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Slides WEOC02 [4.065 MB]
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| DOI • |
reference for this paper
※ https://doi.org/10.18429/JACoW-IBIC2018-WEOC02
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| About • |
paper received ※ 12 September 2018 paper accepted ※ 24 September 2018 issue date ※ 29 January 2019 |
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