Speaker
Description
During the long-term shutdown in FY2021, major upgrades of the main magnet system in the J-PARC Main Ring (MR) were carried out, including the installation of new power supplies, rearrangement of existing PSs, restructuring of magnet families, and cable re-wiring, contributing the beam extraction repetition period for the T2K experiment shortened from 2.48 s to 1.36 s, enabling operation at beam powers exceeding the MR original design of 750 kW. To further increase the beam power beyond 1 MW, the next goal is to reduce the repetition period even further. Technical challenges, such as the high output voltage and peak power receiving, are addressed by adding capacitors to the existing capacitor banks and fine-tuning control command values. In addition, various measures to mitigate beam loss are implemented, such as suppressing current ripple to reduce closed orbit distortion asymmetries, the individual fine-tuning of sextupole magnets to correct third-order resonances, etc.. This report presents the current status and the future prospects toward achieving higher output beam power.
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