H. Hisamatsu

Construction of SuperKEKB vacuum control system and its eight years operation experience

Shinji Terui, Takuya Ishibashi, H. Hisamatsu, Y. Suetsugu et autres

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SuperKEKB vacuum system operation in the last 6 years operation

Y. Suetsugu, K. Shibata, Takuya Ishibashi, M. Shirai et autres

The operation of the SuperKEKB has been ongoing since 2016.The vacuum systems of the main ring (MR) which consists of a 7-GeV electron ring (HER) and a 4-GeV positron ring (LER), the damping ring (DR) for 1.1 GeV positrons in the middle …

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Suppression of electron cloud using copper thermal spray coating in SuperKEKB

M. Yao, Y. Suetsugu, Kyo Shibata, Takuya Ishibashi et autres

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The First Trial of XY-Coupled Beam Phase Space Matching for Three-Dimensional Spiral Injection

Muhammad Abdul Rehman, K. Furukawa, Honoka Hirayama, H. Hisamatsu et autres

The most recent measurement of muon g-2 results in a 3.8σ discrepancy with the equally precise theoretical prediction. The J-PARC muon g-2/EDM experiment (E34) is in preparation to decipher this discrepancy and unravel the new physics beyond the standard model. The precision …

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Report on Collimator Damaged Event in SuperKEKB

Shinji Terui, Y. Funakoshi, H. Hisamatsu, Takuya Ishibashi et autres

Collimator jaws for SuperKEKB main ring, which is an electron-positron collider, installed to suppress background noise in a particle detector complex named Belle II. In high current operations with 500 mA or more, jaws were occasionally damaged by hitting abnormal beams. This …

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Beam Control and Monitors for the Spiral Injection Test Experiment

Muhammad Abdul Rehman, H. Iinuma, A. Ohsawa, Hisayoshi Nakayama et autres

Abstract A new experiment at J-PARC (E34) is under construction to measure the muon's g – 2 to unprecedented precision of 0.1 ppm and electric dipole moment up to the sensitivity of 10–21 e.cm in order to explore new physics beyond the …

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Status of SuperKEKB Vacuum System during Phase-2 Commissioning

Y. Suetsugu, Kyo Shibata, Takuya Ishibashi, M. Shirai et autres

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 …

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Commissioning of vacuum system for SuperKEKB positron damping ring

Kyo Shibata, Y. Suetsugu, Takuya Ishibashi, M. Shirai et autres

The first stage commissioning of the new positron damping ring, which was constructed in the upgraded injector system of the SuperKEKB, was carried out from February to July 2018. Vacuum scrubbing in the arc sections, which occupy most of the ring, progressed …

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Three-dimensional Spiral Injection Scheme Test Experiment

Muhammad Abdul Rehman, H. Iinuma, A. Ohsawa, Hisayoshi Nakayama et autres

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A new approach for measuring the muon anomalous magnetic moment and electric dipole moment

Mitsushi Abe, S. Bae, G. A. Beer, G. Bunce et autres

This paper introduces a new approach to measure the muon magnetic moment anomaly a μ = (g -2)/2 and the muon electric dipole moment (EDM) d μ at the J-PARC muon facility.The goal of our experiment is to measure a μ and …

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Mitigating the electron cloud effect in the SuperKEKB positron ring

Y. Suetsugu, H. Fukuma, K. Ohmi, M. Tobiyama et autres

SuperKEKB is an electron-positron collider with asymmetric energies located at the High Energy Accelerator Research Organization (KEK) in Tsukuba, Japan. After more than five years of upgrading work on KEKB, phase-1 commissioning commenced in February 2016 and ended in June of the …

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SuperKEKB main ring vacuum system status until the end of Phase-2 commissioning

Y. Suetsugu, Kyo Shibata, Takuya Ishibashi, M. Shirai et autres

SuperKEKB is an electron–positron collider with asymmetric energies at KEK aiming at a high luminosity of 8.0 × 1035 cm–2 s–1. The main ring (MR) consists of two rings: a 4 GeV positron ring (low-energy ring, LER) and a 7 GeV electron …

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