Abstract
The accelerator system at Japan Proton Accelerator Research Complex (J-PARC) has been operational since May 2008 and has mainly been used to perform physics experiments. The accelerator system consists of a Linac, a Rapid Cycling Synchrotron (RCS), and a Main Ring Synchrotron. The originally designed RCS injection energy is 400MeV, but the first operation started at 181MeV. New acceleration cavities were installed in J-PARC Linac during the summer shutdown of 2013, and user operation by the Material and Life science Facility (MLF) at the injection energy of 400MeV was started from February 2014. Post beam commissioning of 400MeV injection energy, beam loss was small enough, and we established 300kW continuous operation. Subsequently, the peak current of the Linac was increased from 30mA to 50mA. This upgrade enabled us to try 1-MW beam acceleration. Finally, after some additional improvements, we successfully accelerated 1-MW equivalent protons.
Highlights
The Japan Proton Accelerator Research Complex (J-PARC) is a facility for performing various physics experiments
The front end was replaced in the summer of 2014 to increase the beam current of 50mA to achieve 1-MW beam acceleration
We investigated the effect of injection energy upgrade, and the result demonstrated that beam loss due to space charge tune shift was reduced to an acceptable level [29]
Summary
The Japan Proton Accelerator Research Complex (J-PARC) is a facility for performing various physics experiments. The accelerator complex consists of a 400MeV Linac, a 3GeV Rapid-Cycling Synchrotron (RCS), and a Main Ring synchrotron (MR) [1]. The RCS delivers a 3GeV high-power proton beam to the Material and Life science Facility (MLF) and MR. Construction of other accelerators and experimental facilities continued thereafter, and the RCS started to deliver a proton beam to the MLF in May 2008 [5]. User operation of MLF started in December 2008 [6], and beam power was increased gradually. We smoothly increased the output power, and user operation at 300kW was started at the end of 2012 [8]. The front end was replaced in the summer of 2014 to increase the beam current of 50mA to achieve 1-MW beam acceleration
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