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Title |
Page |
| FRO1B01 |
Summary of the Working Group on Commissioning and Operation |
620 |
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- R. Schmidt
CERN, Geneva, Switzerland
- M.A. Plum
ORNL, Oak Ridge, Tennessee, USA
- Y. Sato
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
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The Working Group D summary report focussed on answering the following issues: - observation of beam losses (e.g. time structure, other parameters,…),
- reducing beam losses with operational parameters away from the design set points,
- reducing beam losses (or concentrating beam losses at a few locations) using collimators,
- minimizing beam losses due to beam transfer from one accelerator to the following accelerator - what parameters are important?
The issue of reducing beam losses with operational parameters away from the design set points is especially valuable as it is rarely discussed.
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Slides FRO1B01 [0.426 MB]
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| TUO3C06 |
The Result of Beam Commissioning in J-PARC 3-GeV RCS |
339 |
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- H. Harada, N. Hayashi, H. Hotchi, M. Kinsho, P.K. Saha, Y. Shobuda, F. Tamura, K. Yamamoto, M. Yamamoto, M. Yoshimoto
JAEA/J-PARC, Tokai-Mura, Naka-Gun, Ibaraki-Ken, Japan
- Y. Irie, T. Koseki, Y. Sato, K. Satou, M.J. Shirakata
KEK, Ibaraki, Japan
- S. Kato
Tohoku University, Graduate School of Science, Sendai, Japan
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J-PARC 3-GeV RCS has started the beam commissioning since Oct. 2007. In the beam commissioning, the beam tuning for basic parameters and high-intensity operation has been continuously performed. This presentation will describe the results of the beam-loss reduction and minimization for high-intensity operation.
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Slides TUO3C06 [7.753 MB]
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| THO1B03 |
Measurement of Optics Errors and Space Charge Effects |
517 |
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- K. Ohmi, Y. Sato, J. Takano
KEK, Ibaraki, Japan
- S. Hatakeyama
JAEA/J-PARC, Tokai-mura, Japan
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Beta function and x-y coupling are measured using turn-by-turn monitor system in J-PARC MR. Errors of the optics parameters induce to undesirable resonances due to lattice nonlinear magnets and space charge force. We estimate the resonance strength and the degradation of emittance growth and beam loss.
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Slides THO1B03 [2.240 MB]
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| THO1C06 |
Recent Commissioning of High-intensity Proton Beams in J-PARC Main Ring |
575 |
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- Y. Sato, K. Hara, Y. Hashimoto, Y. Hori, S. Igarashi, K. Ishii, N. Kamikubota, T. Koseki, Y. Kurimoto, K. Niki, K. Ohmi, C. Ohmori, M. Okada, M. Shimamoto, M.J. Shirakata, T. Sugimoto, J. Takano, M. Tejima, T. Toyama, M. Uota, S. Yamada, N. Yamamoto, M. Yoshii
KEK, Tokai, Ibaraki, Japan
- S. Hatakeyama, H. Hotchi, F. Tamura
JAEA/J-PARC, Tokai-mura, Japan
- S. Nakamura, K. Satou
J-PARC, KEK & JAEA, Ibaraki-ken, Japan
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J-PARC main ring (MR) provides high power proton beams of 200 kW to the neutrino experiment. Beam losses were well managed within capacity of collimation system. Since this beam power was achieved by shortening the repetition rate, following tunings had been applied in order to reduce the beam losses, such as improvement of tune flatness, chromaticity correction, upgrades of injection kickers, dynamic bunch-by-bunch feed-back to suppress transverse oscillation, beam loading compensation using feed-forward technique, and balancing the collimators of MR and the injection beam transport line. The dynamic bunch-by-bunch feed-back was effective to reduce the beam losses to one-tenth during injection and beginning of acceleration. With the beam loading compensation, impedance seen by the beam was significantly reduced, longitudinal oscillations were damped, and the beam power was increased over 5% without increasing the beam losses. Monitors were upgraded to find time structure and location of the beam losses, even in first several turns after each injection. In this presentation these commissioning procedures and beam dynamics simulations are shown, and our upgrade plan is discussed.
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Slides THO1C06 [2.193 MB]
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