Vacuum and Surface Science
Online ISSN : 2433-5843
Print ISSN : 2433-5835
Special Feature : Transactions of the Annual Meeting on the Japan Society of Vacuum and Surface Science 2018[I]
Status of SuperKEKB Vacuum System during Phase-2 Commissioning
Yusuke SUETSUGUKyo SHIBATATakuya ISHIBASHIMitsuru SHIRAIShinji TERUIKen-ichi KANAZAWAHiromi HISAMATSU
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2019 Volume 62 Issue 6 Pages 324-331

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Abstract

SuperKEKB is an electron–positron collider with asymmetric energies at KEK aiming at a high luminosity of 8.0×1035 cm-2 s-1. During the Phase-1 commissioning from February to June 2016 and the Phase-2 commissioning from March to July 2018, the vacuum system worked well as a whole, and the increase in pressure per unit beam current decreased steadily. The photodesorption coefficients at arc sections reached approximately 1×10-6 molecules photon-1 and 7×10-8 molecules photon-1 finally for the positron and electron rings, respectively. The beam lifetime was mainly limited by the Touschek effect in both rings, rather than the beam-gas scattering. The electron cloud effect was observed in the positron ring during Phase-1, but it was suppressed by additional countermeasures applied before Phase-2.

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この記事はクリエイティブ・コモンズ [表示 - 非営利 4.0 国際]ライセンスの下に提供されています。
https://creativecommons.org/licenses/by-nc/4.0/deed.ja
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