Machine Status of J-PARC

Tomizawa, M.

doi:10.1016/j.nuclphysbps.2006.01.055

Cited by 2 publications

(1 citation statement)

References 3 publications

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“…In the first stage of operations, the linac energy is 181 MeV, and the extraction energy for the MR is limited at 30 GeV both for the fastextraction and the slow extraction [1].…”

Section: Introductionmentioning

confidence: 99%

New optics design of injection/fast extraction/abort lines of J-PARC main ring

Tomizawa

Molodozhentsev

Nakamura

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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The J-PARC Main Ring has three straight sections for injection, slow extraction and fast extraction. Injection line has been redesigned so as to give a higher reliability for the thin septa. The magnetic field can be reduced by adding an extra kicker. Alternative optics for the fast extraction with a larger acceptance has been proposed. In this design, the thin septa are replaced by kickers with a large aperture. Beam with an arbitrary energy can be aborted from opposite side from the fast extraction. An external abort line has been designed to deliver the beam aborted at an arbitrary energy to a dump just by using a static quadrupole doublet for the focus.

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“…In the first stage of operations, the linac energy is 181 MeV, and the extraction energy for the MR is limited at 30 GeV both for the fastextraction and the slow extraction [1].…”

Section: Introductionmentioning

confidence: 99%

New optics design of injection/fast extraction/abort lines of J-PARC main ring

Tomizawa

Molodozhentsev

Nakamura

et al. 2007

2007 IEEE Particle Accelerator Conference (PAC)

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Design of dynamic collimator for J-PARC main ring

Tomizawa

Molodozhentsev

Shirakata

2007

2007 IEEE Particle Accelerator Conference (PAC)

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The J-PARC main ring has a beam collimator section downstream of the injection area. The allowed beam loss is about 450 W. The beam halo generated before acceleration can be scraped by a standard collimator scheme. However the beam halo can grow during the acceleration. Such a halo may cause a serious beam loss at the extracion. A collimation during acceleration (dynamic collimator) is useful to reduce the beam loss at the extraction. We propose the dynamic collimator scheme and show the performance expected from the simulations.

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Machine Status of J-PARC

Cited by 2 publications

References 3 publications

New optics design of injection/fast extraction/abort lines of J-PARC main ring

New optics design of injection/fast extraction/abort lines of J-PARC main ring

Design of dynamic collimator for J-PARC main ring

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