Beam commissioning and operation of the J-PARC main ring synchrotron

Koseki, T.; Arakaki, Y.; Chin, Y.H.; Hara, K.; Hasegawa, K.; Hashimoto, Y.; Hori, Yoichiro; Igarashi, S.; Ishii, K.; Kamikubota, N.; Kimura, Takuro; Koseki, K.; Fan, K.; Kubota, C.; Kuniyasu, Y.; Kurimoto, Yoshinori; Lee, Seishu; Matsumoto, Hiroshi; Molodozhentsev, Alexander; Morita, Yuichi; Murasugi, Shigeru; Muto, R.; Naito, F.; Nakagawa, Hidetoshi; Nakamura, Shu; Niki, K.; Ohmi, K.; Ohmori, C.; Okada, Masashi; Okamura, Katsuya; Oogoe, T.; Ooya, Kazufumi; Sato, Keisuke; Sato, Yoichi; Sato, Yoshihiro; Satou, Kenichirou; Shimamoto, Masayuki; Shirakata, M.; Someya, Hirohiko; Sugimoto, T.; Takano, J.; Takeda, Yasuhiro; Takiyama, Y.; Takeuchi, Masaki; Toda, Makoto; Tomizawa, M.; Toyama, T.; Uota, Masahiko; Yamada, Shuho; Yamamoto, Noboru; Yanaoka, Eiichi; Yoshii, M.; Harada, Hiroyuki; Hatakeyama, Shuichiro; Hotchi, H.; Nomura, Masahiro; Schnase, A.; Shimada, Taihei; Tamura, Fumihiko; Yamamoto, Masanobu; Shimogawa, Tetsushi

doi:10.1093/ptep/pts071

Cited by 37 publications

(23 citation statements)

References 4 publications

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“…However, the magnet current regulators can not be always optimized for precise regulation since accelerator facilities are usually multi-purpose. For instance, the J-PARC Main Ring (MR) [3] provides proton beams to experiments via two different extraction modes. One is called "the fact extraction" (FX), which is used for the neutrino production.…”

Section: Real-time Betatron Tune Correction With the Precise Measuremmentioning

confidence: 99%

Real-Time Betatron Tune Correction With the Precise Measurement of Magnet Current

Kurimoto

Shimogawa

Naito

2019

IEEE Trans. Nucl. Sci.

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The betatron tune, which is defined as the number of transverse oscillations in one turn of a ring accelerator, is one of the most important parameters. An undesired betatron tune increases the amplitude of the transverse oscillation so that many particles are lost from the ring sooner than designed. Since a betatron tune is controlled by the magnetic fields in the ring, the ripple of the magnet current directly displaces the betatron tune from its designated value. We have developed a system that corrects the betatron tune displacement using the measured magnet current at the J-PARC (Japan Proton Accelerator Research Complex) Main Ring. We adopted Field Programmable Gated Arrays (FPGA) to convert from the measured magnet current to the betatron tune in real time. Using the system, we have decreased the fluctuation of the betatron tune σν from 5.2×10 −4 to 3.3 × 10 −4 at the frequencies less than 250 Hz.

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Section: Real-time Betatron Tune Correction With the Precise Measuremmentioning

confidence: 99%

Real-Time Betatron Tune Correction With the Precise Measurement of Magnet Current

Kurimoto

Shimogawa

Naito

2019

IEEE Trans. Nucl. Sci.

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“…However, we consider the motion in circular accelerators (synchrotrons). Then the particles which are scattered at a small angle in the primary collimator and are not intercepted immediately by the secondary collimators can be still collimated in the next turns [13][14][15][16][17][18][19][20][21].…”

Section: Two-stage Betatron Collimation Designmentioning

confidence: 99%

“…For protons and fully stripped ions, a conventional twostage (or multistage) betatron collimation system [11,12] is going to be applied in SIS100. Such a concept is well established and widely used for collimation of proton beams in circular accelerator facilities such as CERN LHC [13][14][15], J-PARC synchrotrons [16,17], Fermilab synchrotrons [18,19], ORNL SNS [20], DESY HERA [21,22], or CSNS RCS [23,24]. However, there are only a few applications of the two-stage concept for the collimation of ion beams.…”

Section: Introductionmentioning

confidence: 99%

Beam halo collimation in heavy ion synchrotrons

Strasik

Prokhorov

2015

Phys. Rev. ST Accel. Beams

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This paper presents a systematic study of the halo collimation of ion beams from proton up to uranium in synchrotrons. The projected Facility for Antiproton and Ion Research synchrotron SIS100 is used as a reference case. The concepts are separated into fully stripped (e.g., 238 U 92þ) and partially stripped (e.g., 238 U 28þ) ion collimation. An application of the two-stage betatron collimation system, well established for proton accelerators, is intended also for fully stripped ions. The two-stage system consists of a primary collimator (a scattering foil) and secondary collimators (bulky absorbers). Interaction of the particles with the primary collimator (scattering, momentum losses, and nuclear interactions) was simulated by using FLUKA. Particle-tracking simulations were performed by using MAD-X. Finally, the dependence of the collimation efficiency on the primary ion species was determined. The influence of the collimation system adjustment, lattice imperfections, and beam parameters was estimated. The concept for the collimation of partially stripped ions employs a thin stripping foil in order to change their charge state. These ions are subsequently deflected towards a dump location using a beam optical element. The charge state distribution after the stripping foil was obtained from GLOBAL. The ions were tracked by using MAD-X.

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“…J -PARC MR is a high intensity proton synchrotron for the particle and nuclear physics. The proton beam is accelerated from 3 GeV to 30 GeV in the MR and provided to experimental facilities [1]. The intensity of the extraction beam has reached 500 kW.…”

Section: Introductionmentioning

confidence: 99%

A Control System of New Magnet Power Converter for J-PARC Main Ring Upgrade

Shimogawa

Kurimoto

Morita

et al. 2019

IEEE Trans. Nucl. Sci.

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Japan Proton Accelerator Research Complex (J-PARC) aims at a MW-class proton accelerator facility. One of the promising solutions for increasing the beam power of the Main Ring (MR) is converters of the main magnets with new ones for this upgrade. We have a plan to replace and develop the power converters of main magnets for this upgrade. According to develop the new power converter. We have developed a new control system for the new power converters. This control system consists of four parts : the current measuring device, the feedback control system, the gate pulse generator and the slow control system. Considering a reproducibility in the mass-production and the facilitation of the control algorithm, the digital control system is adopted. We will report the design of this control system and some test result with a new power converter for small quadrupole magnets.

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Beam commissioning and operation of the J-PARC main ring synchrotron

Cited by 37 publications

References 4 publications

Real-Time Betatron Tune Correction With the Precise Measurement of Magnet Current

Real-Time Betatron Tune Correction With the Precise Measurement of Magnet Current

Beam halo collimation in heavy ion synchrotrons

A Control System of New Magnet Power Converter for J-PARC Main Ring Upgrade

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