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The betatron tune, which is defined as the number of transverse oscillationsin one turn of a ring accelerator, is one of the most important parameters. Anundesired betatron tune increases the amplitude of the transverse oscillationso that many particles are lost from the ring sooner than designed. Since abetatron tune is controlled by the magnetic fields in the ring, the ripple ofthe magnet current directly displaces the betatron tune from its designatedvalue. We have developed a system that corrects the betatron tune displacementusing the measured magnet current at the J-PARC (Japan Proton AcceleratorResearch Complex) Main Ring. We adopted Field Programmable Gated Arrays (FPGA)to convert from the measured magnet current to the betatron tune in real time.Using the system, we have decreased the fluctuation of the betatron tune from5.2e-4 to 3.3e-4 at the frequencies less than 250 Hz.

Real-Time Betatron Tune Correction with the Precise Measurement of Magnet Current