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- W2781798780 abstract "The purpose of SuperKEKB is to search a new physics beyond the standard model of the particle physics in the B meson regime. SuperKEKB consists of an injector linac, a damping ring for the positron beam and two main rings: i.e. the low energy ring (LER) for positrons and the high energy ring (HER) for electrons, and the physics detector named Belle II. The beam energies of LER and HER are 4GeV and 7GeV, respectively. The design beam currents of LER and HER are 3.6A and 2.6A, respectively. The design luminosity is 8 x 1035 cm-2s-1. More details of SuperKEKB are described elsewhere [1]. The beam commissioning of SuperKEKB will proceed in three steps; i.e. Phase 1, 2 and 3. The Phase 1 commissioning has been already done for 5 months in 2016. In Phase 1, the superconducting final focus doublets and other correction coils (called QCS as a whole) and Belle II were not installed and no beam collision was performed. The commissioning of the damping ring, which is newly introduced for SuperKEKB, will start in December 2017. The Phase 2 commissioning of the main rings will start in middle of February 2018 and continue for about 5 months. In Phase 2, the QCS magnets and the main part of the Belle II detector will be installed. But the vertex detector will not be installed in Phase 2. This is based on an idea that the vertex detector, which is very sensitive to the beam background, should be installed after sufficient beam tuning with the QCS magnets. From the viewpoint of the accelerator tuning, we can make machine tuning on condition that hardware components are fully installed except for the beam background tuning to the vertex detector. The target luminosity in Phase 2 is 1 x 1034 cm- 2 s-1. The Phase 3 commissioning will start in autumn 2018. In this phase, the vertex detector will be installed and we will continue beam tuning aiming at the design luminosity in parallel with the physics experiment." @default.
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- W2781798780 date "2017-01-01" @default.
- W2781798780 modified "2023-09-26" @default.
- W2781798780 title "Highlights from SuperKEKB Commissioning Phase 1 and Plan for Phase 2" @default.
- W2781798780 hasPublicationYear "2017" @default.
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