| Paper |
Title |
Page |
| TPAT050 |
Beam Dynamics Design of the L3BT for J-PARC
|
3091 |
| |
- T. Ohkawa
JAERI, Ibaraki-ken
- M. Ikegami
KEK, Ibaraki
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L3BT is beam transportation line from the linac to the 3-GeV RCS which is the part of the accelerators for the High-Intensity Proton Accelerator Facility Project, J-PARC.In this paper, especially results of the beam simulation of the injection section of the L3BT are presented. And the matching of rms envelopes and dispersion function for space charge dominated beams are also discussed.
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| WPAE014 |
Conceptual Design of a Longitudinal Halo Collimator for J-PARC Linac
|
1413 |
| |
- M. Ikegami
KEK, Ibaraki
- T. Ohkawa
JAERI, Ibaraki-ken
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In a high-intensity proton accelerator, avoidance of excess beam loss is essentially important to enable hands-on maintenance. To reduce the uncontrolled beam loss in the following ring, we plan to install a longitudinal halo collimator system in a beam transport line after the injector linac. The collimator system is supposed to have two main roles: One is the elimination of longitudinal tail or halo particles destined to be lost in the following ring, and the other is the removal of anomalous beams which can be resulted from, for example, RF discharge of an accelerating cavity. We plan to adopt a "periodic collimation scheme" in the collimator system taking advantage of the three-fold symmetry of the arc section. The momentum aperture of the collimator system is expected to be reduced by the factor of two adopting periodic collimation. In this paper, conceptual design of the collimator system is presented together with the results of particle simulations.
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| FPAE043 |
Transverse Tuning Scheme for J-PARC Linac
|
2750 |
| |
- M. Ikegami, Z. Igarashi, S. Lee
KEK, Ibaraki
- H. Akikawa, K. Hasegawa, Y. Kondo, T. Ohkawa
JAERI, Ibaraki-ken
- H. Ao, S. Sato, T. Tomisawa, A. Ueno
JAERI/LINAC, Ibaraki-ken
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In a high-intensity linac, precise transverse matching is essential for beam halo mitigation. In this paper, we present the supposed transverse tuning scheme for J-PARC linac and the planned beam diagnostic layout for it. Relevantly, we briefly touch upon the tuning scenario for the arc section and the transverse halo collimator system which are located between the linac and the succeeding ring.
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