表面と真空
Online ISSN : 2433-5843
Print ISSN : 2433-5835
特集「2018年日本表面真空学会学術講演会特集号Ⅰ」
Phase-2運転時のSuperKEKB加速器真空システムの状況
末次 祐介柴田 恭石橋 拓弥白井 満照井 真司金澤 健一久松 広美
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2019 年 62 巻 6 号 p. 324-331

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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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