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Status of J-PARC Accelerators

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Robert M Zwaska
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Robert M Zwaska
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24 Nov 2015, 11:15
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24 Nov 2015, 11:15
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24 Nov 2015, 12:40
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J-PARC accelerator complex consists of a linac, a 3 GeV synchrotron (Rapid Cycling Synchrotron, RCS) and a Main Ring synchrotron (MR). A proton beam from the RCS is injected to the Materials and Life Science Experimental Facility (MLF) for neutron and muon experiments, and to the MR. MR accelerates beam up to 30 GeV. The beam is used for Hadron or Neutrino experiments.

Beam commissioning of the linac and the RCS started in 2007, while beam commissioning for the MLF and the MR in started in May 2008. The user operation for the MLF with beam power of 20 kW started and also 25 Hz switching operation for the MLF and the MR on 23rd December 2008. At present, beam power has been increasing to 500 kW for the MLF, ~335 kW for the neutrino experiment and ~40 kW for the Hadron experiment users.

Recently the hardware improvement of the injector linac has been completed, by which the injection energy was upgraded from 181 MeV to the design value of 400 MeV in 2013, and then, the injection peak current was upgraded from 30 mA to the design value of 50 mA in 2014. Beam studies were performed to demonstrate the capability of the RCS to operate at powers in excess of 1 MW. The study produced a beam intensity of 8.41x1013 protons during short time, an intensity equivalent to 1.01 MW operation on 10th January 2015. I present status and future plans of J-PARC accelerators in my talk.

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