Current Status and Performance of the J-PARC Accelerators
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概要
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J-PARC (Japan Proton Accelerator Research Complex) is a multi-purpose research facility for materials and life sciences, nuclear and particle physics, and nuclear engineering with MW class proton beams at 3 GeV and at several 10 GeV. The accelerator complex consists of a 400-MeV linac, a 3-GeV Rapid Cycling Synchrotron (RCS), and a 50-GeV Main Ring synchrotron (MR). It is a challenge to suppress beam loss to the level to allow hands-on maintenance of accelerator components. The RCS scheme is adopted to realize this, which is advantageous over a conventional accumulation ring regarding less beam loss due to lower beam current and easier construction and operation of a linac. RCS, however, required challenging technologies such as a high field radio frequency system, ceramic ducts to reduce eddy current effects. The linac has also unique technologies to minimize beam loss, such as compact electromagnet Drift-Tube Quadrupoles for precise beam size controls, and a fast beam suspending system. The linac achieved its first goal energy of 181 MeV in Jan. 2007. RCS beam was accelerated to its designed energy of 3 GeV in Oct. 2007. The beam acceleration in MR to 30 GeV was established in Dec. 2008. The first neutron and muon beams were produced in May and Sep. 2008, at Materials and Life science experimental Facility (MLF). The linac commissioning has resulted in stable beam with short down time. RCS recorded the highest beam power of 0.21 MW in Sep. 2008 with beam loss localized at the collimators. The linac beam energy will be upgraded to 400 MeV with Annular Coupled Structure linac (ACS) to increase the beam power.