| Paper |
Title |
Page |
| MOPCH120 |
Ground Motion Study and the Related Effects on the J-PARC
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327 |
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- S. Takeda, N. Yamamoto, M. Yoshioka
KEK, Ibaraki
- Y. Nakayama
JPOWER, Kanagawa-ken
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The power spectrum density, coherence and cross-spectrum density of the ground motion in the J-PARC site are studied to get the guideline of the beam control systems. J-PARC consists of a 600 MeV linac, a 3 GeV Rapid-cycling synchrotron (RCS) and a 50 GeV synchrotron (MR). MR provides a beam current of 15 micro-A with a period of 3 sec to either the nuclear physics experimental area or the neutrino production target. MR is a very high beam power machine, so its optimum beam loss must be kept fewer than 0.01% of an accelerated beam in order to decrease the radiation damage of accelerator components and to get easy accessibilty to them. From the point of view of beam loss, we give some detailed discussion about the relation between the MR operation and the ground motion using the observed data.
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| MOPCH121 |
Ground Motion Measurement at J-PARC
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330 |
| |
- Y. Nakayama, K. Tada
JPOWER, Kanagawa-ken
- S. Takeda, M. Yoshioka
KEK, Ibaraki
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In the next generation accelerator, construction of the machine on the stable ground is preferable for accelerator beam operation. We have measured ground motion at the J-PARC site under construction, where the ground is very close to the Pacific Ocean. In this paper, some of the observed results are shown, comparing the results of the previous observation at some accelerator facilities and next generation accelerator candidate sites in Japan.
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