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Reduction of beam loss at the Electrostatic Septum (ESS) during the slow extraction process is one of the major challenges for the J-PARC Main Ring (MR) slow extraction operation, which aims to increase beam power beyond 150 kW. Researchers at the CERN SPS have reported that beam loss at the ESS can be effectively reduced by installing a bent silicon crystal upstream of the ESS to utilize its charged particle deflection effect.
This paper reports on optimization studies using simulations to maximize the beam loss reduction effect when such a bent silicon crystal is installed upstream of the ESS in the J-PARC MR. Specifically, we report details on the following points:
1) The silicon crystal is bent using a method known as anticlastic deformation, which inherently causes deformation of the crystal in the vertical direction. In the J-PARC MR, where the vertical beam size is large, this vertical deformation has a non-negligible impact on the beam loss reduction effect and must therefore be taken into consideration.
2) We also evaluate the influence of errors in the bending angle, such as torsion, which are present in actual bent silicon crystals.
3) We assess the impact of particles scattered by the bent crystal that circulate the ring and return to the slow extraction straight section.
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