Abstract
Installation of the kicker magnets in the extraction section of the rapid cycling synchrotron in the J-PARC facility has been completed. They succeeded in extracting the proton beam accelerated up to 3 GeV in the first commissioning with beam. The operation parameters of the kicker system agreed well with the parameters, which were estimated from the magnetic field measurement and the current test of each power supply. The distribution of the integrated magnetic field is flat enough to meet the beam requirements. The beam based measurement of the flattop of the magnetic field was performed with the beam position monitors. Although a ringing structure was observed, which exceeded the specified limit, the degree of the flattop distortion could be corrected by the timing adjustment of the output current. The stability of the power supply is on the order of � 0:2%, which is sufficient to achieve stable beam extraction. The rise time of the output current largely depends on the gas pressure in the thyratrons. Dependence of the rise time on the gas pressure was strictly measured and the number of unwanted prefires could be reduced.
Highlights
The Japan Proton Accelerator Research Complex (J-PARC) is a high-intensity proton accelerator facility project [1]
The rapid cycling synchrotron (RCS) is a keystone of the J-PARC facility because it assumes the role of both the main accelerator for a pulsed spallation neutron source facility and the injector to the main ring (MR)
The thyratron, which is a CX1193C made by e2V Ltd., is used to switch the high voltage charged in the pulse forming lines (PFL)
Summary
The Japan Proton Accelerator Research Complex (J-PARC) is a high-intensity proton accelerator facility project [1]. The beam was successfully accelerated by the rf system [2] and extracted by the kicker magnet system. The RCS aims to achieve the proton beam power of 1 MW, which means each cycle two bunches of 8:3 Â 1013 protons are accelerated up to 3 GeV at 25 Hz repetition rate. In order to extract such an unusual high power beam at the rapid repetition rate, there are several challenging requests for the kicker magnet system of the RCS. In order to obtain such a fast rise time, we have to choose devices which are difficult to handle and operate in a complex configuration.
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