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Journal Articles

High precision tracking control for rapid cycling magnets

Watanabe, Yasuhiro; Tani, Norio; Adachi, Toshikazu*; Someya, Hirohiko*; Irie, Yoshiro*

Proceedings of 9th Annual Meeting of Particle Accelerator Society of Japan (Internet), p.538 - 540, 2012/08

Rapid cycling magnets are excited using a resonant circuit and the current waveform is a DC-biased sinusoidal pattern. However, non-linear characteristic of the magnet produces harmonic components in the magnetic field. The harmonic components are different for each type of magnet depending upon the degree of saturation, and it causes a tracking error. This paper proposes harmonic current control in the resonant circuit to reduce harmonic components in the magnetic field.

Journal Articles

Suppression scheme of COD variation caused by switching ripple in J-PARC 3GeV dipole magnet power supply

Watanabe, Yasuhiro; Tani, Norio; Adachi, Toshikazu*; Igarashi, Susumu*; Someya, Hirohiko*

Proceedings of 1st International Particle Accelerator Conference (IPAC '10) (Internet), p.3242 - 3244, 2010/05

In the J-PARC 3 GeV synchrotron, the horizontal closed-orbit-distortion (COD) variation was observed at first of beam commissioning. The COD correction was very difficult to archive because the beam orbit of each shot changes periodically at a period of about 140 seconds. This paper clarifies that the horizontal COD is caused by the switching noise of the dipole magnet power supply and the periodic variation of the beam orbit is caused by the phase sweep of 1 kHz component that include switching noise. Moreover, it has been demonstrate that the dipole magnet power supply using the improved Pulse Width Modulation (PWM) circuit with a synchronized timing system of the accelerator has successfully suppressed the beam orbit variation.

Journal Articles

The Measurement of magnetic field interference of adjacent to quadrupole magnets of J-PARC RCS

Tani, Norio; Watanabe, Yasuhiro; Adachi, Toshikazu*; Someya, Hirohiko*; Igarashi, Susumu*

Proceedings of 3rd Annual Meeting of Particle Accelerator Society of Japan and 31st Linear Accelerator Meeting in Japan (CD-ROM), p.415 - 417, 2006/00

no abstracts in English

Journal Articles

Development of current control system for resonant power supply in the J-PARC RCS

Watanabe, Yasuhiro; Tani, Norio; Adachi, Toshikazu*; Igarashi, Susumu*; Someya, Hirohiko*

Proceedings of 3rd Annual Meeting of Particle Accelerator Society of Japan and 31st Linear Accelerator Meeting in Japan (CD-ROM), p.424 - 426, 2006/00

no abstracts in English

Journal Articles

Development of the positioning system for field measurements of J-PARC RCS magnets

Haga, Koichi; Tani, Norio; Watanabe, Yasuhiro; Someya, Hirohiko*; Adachi, Toshikazu*

Proceedings of 3rd Annual Meeting of Particle Accelerator Society of Japan and 31st Linear Accelerator Meeting in Japan (CD-ROM), p.418 - 420, 2006/00

no abstracts in English

Journal Articles

Design of RCS magnets for J-PARC 3-GeV synchrotron

Tani, Norio; Adachi, Toshikazu*; Igarashi, Susumu*; Watanabe, Yasuhiro; Someya, Hirohiko*; Sato, Hikaru*; Kishiro, Junichi

IEEE Transactions on Applied Superconductivity, 14(2), p.409 - 412, 2004/06

 Times Cited Count:17 Percentile:61.6(Engineering, Electrical & Electronic)

The 3-GeV synchrotron proposed in the JAERI/KEK Joint Project (J-PARC) is a rapid-cycling synchrotron (RCS), which accelerates a high-intensity proton beam from 400-MeV to 3-GeV at a repetition rate of 25-Hz. The 3-GeV synchrotron is used to produce pulsed spallation neutrons and muons. It also works as an injector for a 50-GeV synchrotron. The 3-GeV synchrotron consists of 24 dipole magnets, 60 quadrupole magnets, 18 sextupole magnets and 52 steering magnets. Since the magnets for the 3-GeV synchrotron are required to have a large aperture in order to realize the large beam power of 1 MW, there is a larger fringe field at a pole end than a usual synchrotron magnet. Therefore, it is important to estimate the magnetic field and the effect of multipole component at the fringe field. In this paper, we report the results of the field calculation and mechanical design of RCS magnets.

Journal Articles

Eddy current effect of magnets for J-PARC 3-GeV synchrotron

Tani, Norio; Adachi, Toshikazu*; Someya, Hirohiko*; Watanabe, Yasuhiro; Sato, Hikaru*; Kishiro, Junichi

IEEE Transactions on Applied Superconductivity, 14(2), p.421 - 424, 2004/06

 Times Cited Count:12 Percentile:54.69(Engineering, Electrical & Electronic)

The 3-GeV synchrotron proposed in the JAERI/KEK Joint Project (J-PARC) is a rapid-cycling synchrotron (RCS), which accelerates a high-intensity proton beam from 400-MeV to 3-GeV at a repetition rate of 25-Hz. The 3-GeV synchrotron is used to produce pulsed spallation neutrons and muons. Since the magnets for the 3-GeV synchrotron are required to have a large aperture in order to realize the large beam power of 1 MW, there is a larger fringe field at a pole end than a usual synchrotron magnet. In addition, 25-Hz ac field induces an eddy current in magnet components, magnet end plates and etc. The eddy current induced in the end plates is expected to be large. Therefore, it is important to investigate an effect of large leakage field and eddy current to the beam motion around the magnet end part. We have measured the eddy loss and the eddy field at the edges of the dipole and quadrupole magnets. In this paper, we report the comparison between the results of the measurements and the two-dimensional eddy current model developed for this study.

JAEA Reports

VXIbus-based signal generator for resonant power supply system of the 3GeV RCS

Zhang, F.; Watanabe, Yasuhiro; Koseki, Shoichiro*; Tani, Norio; Adachi, Toshikazu*; Someya, Hirohiko*

JAERI-Tech 2002-039, 21 Pages, 2002/03

JAERI-Tech-2002-039.pdf:2.2MB

The 3 GeV Proton RCS of the JAERI-KEK Joint Project is a 25 Hz separate-function rapid cycling synchrotron under design. Bending magnets (BM) and quadrupole magnets (QM) are excited separately. The 3 GeV RCS requests above 10 families of magnets excited independently, far beyond 3 families in practical RCS's. Difficulty of field tracking between BM and QM is significantly increased Magnet strings are grouped into resonant networks and excited resonantly by power supplies driven by a waveform pattern, typically a DC-biased sinusoidal signal. To achieve a close tracking between many families, the driving signal of each power supply should be adjusted in phase and amplitude flexibly and dynamically.This report proposes a signal generator based on VXIbus. The VXIbus, an extension of VMEbus (VME eXtension for Instrument), provides an open architecture with shared process bus and timing. The VXIbus-based signal generator facilitates the timing synchronization and extension to many channels needed by the 3 GeV RCS. Experimental results of the signal generator are reported.

Journal Articles

Design of a dipole magnet for the 3-GeV proton synchrotron of the JAERI/KEK joint project

Tani, Norio; Kanazawa, Kenichiro; Shimada, Taihei; Suzuki, Hiromitsu; Watanabe, Yasuhiro; Adachi, Toshikazu*; Someya, Hirohiko*

Proceedings of 8th European Particle Accelerator Conference (EPAC 2002), p.2376 - 2378, 2002/00

The 3-GeV synchrotron proposed in the JAERI/KEK Joint Project is a rapid-cycling synchrotron (RCS), which accelerates a high-intensity proton beam from 400 MeV to 3 GeV at a repetition rate of 25 Hz. The 3-GeV synchrotron is used to produce pulsed spallation neutrons and muons. It also works as an injector for a 50-GeV synchrotron. Since the magnets for the 3-GeV synchrotron are required to have a large aperture in order to realize the large beam power of 1 MW, there is a large leakage field at an end part than a usual synchrotron magnet. In addition, 25-Hz ac field induces an eddy current in magnet components: e.g. a coil, magnet end plates and etc. We intend to use a stranded conductor as a coil conductor so that the eddy current induced in the coil can be reduced. On the other hand, the eddy current induced in the end plates is expected to be large. Therefore, it is important to investigate an effect of the large leakage field and the eddy current to the beam motion around the magnet end part. We have constructed a prototype dipole magnet and field measurement system for this purpose. This paper reports the results of the design and the preliminary test about this magnet.

Journal Articles

Study of resonant magnet exciting system for the 3GeV proton synchrotron

Koseki, Shoichiro*; Zhang, F.; Watanabe, Yasuhiro; Tani, Norio; Adachi, Toshikazu*; Someya, Hirohiko*

Heisei-13-Nen Denki Gakkai Sangyo Oyo Bumon Zenkoku Taikai Koen Rombunshu, 1, p.253 - 256, 2001/08

no abstracts in English

Journal Articles

Magnet power supply of a 3-GeV proton synchrotron for the JAERI/KEK joint project

Watanabe, Yasuhiro; Zhang, F.; Koseki, Shoichiro*; Tani, Norio; Adachi, Toshikazu*; Someya, Hirohiko*

Heisei-13-Nen Denki Gakkai Sangyo Oyo Bumon Zenkoku Taikai Koen Rombunshu, 2, p.761 - 762, 2001/08

no abstracts in English

Oral presentation

Commisioning of resonant power supply in J-PARC 3GeV RCS

Watanabe, Yasuhiro; Tani, Norio; Adachi, Toshikazu*; Igarashi, Susumu*; Someya, Hirohiko*

no journal, , 

no abstracts in English

Oral presentation

Modeling for AC loss and inductance saturation in rapid cycling magnet

Watanabe, Yasuhiro; Tani, Norio; Adachi, Toshikazu*; Igarashi, Susumu*; Someya, Hirohiko*

no journal, , 

no abstracts in English

Oral presentation

Suppression scheme of over current caused by magnet inductance saturation for J-PARC 3GeV dipole magnet power supply

Watanabe, Yasuhiro; Tani, Norio; Adachi, Toshikazu*; Igarashi, Susumu*; Someya, Hirohiko*

no journal, , 

no abstracts in English

Oral presentation

Development of a feedback control system for resonant power supplies in J-PARC 3-GeV synchrotron

Watanabe, Yasuhiro; Tani, Norio; Adachi, Toshikazu*; Igarashi, Susumu*; Someya, Hirohiko*

no journal, , 

Oral presentation

Suppression scheme of COD variation caused by switching ripple in J-PARC 3GeV dipole magnet power supply

Watanabe, Yasuhiro; Tani, Norio; Adachi, Toshikazu*; Igarashi, Susumu*; Someya, Hirohiko*

no journal, , 

no abstracts in English

16 (Records 1-16 displayed on this page)
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