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Report No.
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Status and progress of the J-PARC 3 GeV RCS

Kinsho, Michikazu  

The J-PARC RCS has been delivered more than 300 kW beam to both the MLF and the MR with high reliability. To realize simultaneously two kinds of beam shape which are required from the MLF and the MR, two pulse dipole magnets for injection painting were installed in the beam transport line from the Linac to the RCS. It was successful to make two kinds of beam shape with injection painting bump magnets and these added pulse dipole magnets. This injection painting system is used for user operation and works well for reduction of beam losses. Not only user operation but also high power beam test was performed, and beam power of 524 kW for 35 second was achieved with low beam loss in the RCS. The loss rate was about 2% and this was acceptable because design value of the beam loss was 3%. This power corresponds to 1.6 MW for 400 MeV injection in terms of the Lasslett tune shift. In this high-intensity trial, significant progress toward design output beam power of 1 MW was demonstrated.

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