eeFACT2018 - Classification: Commissioning and operation

Paper	Title	Page
MOXAA02	Highlights from SuperKEKB Commissioning	1
	Y. Ohnishi KEK, Ibaraki, Japan
	SuperKEKB is an electron-positron double-ring asymmetric-energy collider to search new physics phenomena appeared in B-boson decays. In order to accomplish this purpose, the huge statics, it is necessary for 40 times the luminosity as high as the predecessor KEKB collider. The strategy is that the vertical beta function at the IP is squeezed down to 1/20 and the beam currents doubles those of KEKB while keeping the same beam-beam parameter. The vertical beta function at the IP will be much smaller than the bunch length, however, the hourglass effect which degrades the luminosity will be reduced by adopting a novel ‘‘nano-beam’ scheme. First of all, the Phase 2 commissioning was focused on the verification of nano-beam scheme. Secondary, beam related background at the Belle II detector was also studied for the preparation of the pixel vertex detector installed before the Phase 3 operation. The preliminary results and accomplishments of the commissioning in Phase 2 will be reported in this article.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-MOXAA02
About •	paper received ※ 12 October 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019
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TUOAB04	Optics Corrections including IP Local Coupling at SuperKEKB	63
	A. Morita, H. Koiso, K. Ohmi, Y. Ohnishi, H. Sugimoto, D. Zhou KEK, Ibaraki, Japan
	The phase-2 commissioning of the SuperKEKB accelerator with the interaction point(IP) has been performed from March 19 to July 17. In the collision operation during this commissioning, the vertical beta function at the IP was squeezed down to 3mm. In order to achieve such low beta collision operation, many optics corrections were performed. We present the result of those optics measurement and correction.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUOAB04
About •	paper received ※ 12 October 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPBB05	Beam Instrumentation at SuperKEKB	169
	G.M. Mitsuka, M. Arinaga, J.W. Flanagan, H. Fukuma, H. Ikeda, H. Ishii, S.H. Iwabuchi, K. Mori, E. Mulyani, M. Tejima, M. Tobiyama KEK, Ibaraki, Japan G. Bonvicini Wayne State University, Detroit, Michigan, USA E. Mulyani Sokendai, Ibaraki, Japan G.S. Varner University of Hawaii, Honolulu,, USA
	Phase 2 commissioning of the SuperKEKB electron-positron collider has been performed with final focus optics from February 8 to July 17, 2018. The main aims of Phase 2 commissioning were to verify the novel nano-beam collision scheme and achieve the machine luminosity O(10³⁴ cm^-2s^-1). The beam instruments including the bunch-by-bunch feedback and orbit feedback systems, which are central to the beam diagnostics at SuperKEKB, were successfully operated throughout Phase 2. In this talk, we will present the commissioning results focusing on beam diagnostics and show prospects for the final phase of commissioning from next spring.
DOI •	reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUPBB05
About •	paper received ※ 26 September 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019
Export •	reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

Paper

Title

Page

Highlights from SuperKEKB Commissioning

1

Y. Ohnishi
KEK, Ibaraki, Japan

SuperKEKB is an electron-positron double-ring asymmetric-energy collider to search new physics phenomena appeared in B-boson decays. In order to accomplish this purpose, the huge statics, it is necessary for 40 times the luminosity as high as the predecessor KEKB collider. The strategy is that the vertical beta function at the IP is squeezed down to 1/20 and the beam currents doubles those of KEKB while keeping the same beam-beam parameter. The vertical beta function at the IP will be much smaller than the bunch length, however, the hourglass effect which degrades the luminosity will be reduced by adopting a novel ‘‘nano-beam’ scheme. First of all, the Phase 2 commissioning was focused on the verification of nano-beam scheme. Secondary, beam related background at the Belle II detector was also studied for the preparation of the pixel vertex detector installed before the Phase 3 operation. The preliminary results and accomplishments of the commissioning in Phase 2 will be reported in this article.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-MOXAA02

About •

paper received ※ 12 October 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUOAB04

Optics Corrections including IP Local Coupling at SuperKEKB

63

A. Morita, H. Koiso, K. Ohmi, Y. Ohnishi, H. Sugimoto, D. Zhou
KEK, Ibaraki, Japan

The phase-2 commissioning of the SuperKEKB accelerator with the interaction point(IP) has been performed from March 19 to July 17. In the collision operation during this commissioning, the vertical beta function at the IP was squeezed down to 3mm. In order to achieve such low beta collision operation, many optics corrections were performed. We present the result of those optics measurement and correction.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUOAB04

About •

paper received ※ 12 October 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)

TUPBB05

Beam Instrumentation at SuperKEKB

169

G.M. Mitsuka, M. Arinaga, J.W. Flanagan, H. Fukuma, H. Ikeda, H. Ishii, S.H. Iwabuchi, K. Mori, E. Mulyani, M. Tejima, M. Tobiyama
KEK, Ibaraki, Japan
G. Bonvicini
Wayne State University, Detroit, Michigan, USA
E. Mulyani
Sokendai, Ibaraki, Japan
G.S. Varner
University of Hawaii, Honolulu,, USA

Phase 2 commissioning of the SuperKEKB electron-positron collider has been performed with final focus optics from February 8 to July 17, 2018. The main aims of Phase 2 commissioning were to verify the novel nano-beam collision scheme and achieve the machine luminosity O(10³⁴ cm^-2s^-1). The beam instruments including the bunch-by-bunch feedback and orbit feedback systems, which are central to the beam diagnostics at SuperKEKB, were successfully operated throughout Phase 2. In this talk, we will present the commissioning results focusing on beam diagnostics and show prospects for the final phase of commissioning from next spring.

DOI •

reference for this paper ※ https://doi.org/10.18429/JACoW-eeFACT2018-TUPBB05

About •

paper received ※ 26 September 2018 paper accepted ※ 19 February 2019 issue date ※ 21 April 2019

Export •

reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)