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Design of an RF coupler for the J-PARC RFQ

Kondo, Yasuhiro   ; Hasegawa, Kazuo; Morishita, Takatoshi  ; Naito, Fujio*

Now, J-PARC accelerator developing new RFQ for stable operation. The specification of this new RFQ is same as the now operating RFQ. Resonant frequency is 324MHz, injection energy is 50keV, extraction energy is 3MeV, RF duty is 3%. However, we adopt Dipole Stabilizing Rods (DSR's) instead of Pi-mode Stabilizing Loops (PISL's), which are potential cause of discharging. And assemble method will be brazing to increase reliability. As for the RF couplers, to simplify the structure, we will change to one-feed from two-feed. Maximum peak power to feed is 400kW and duty is 3%. In this paper, the design of the RF coupler for the new J-PARC RFQ is described.

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