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Thermal characteristics of a new RFQ for J-PARC

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

A new RFQ for the J-PARC linac is under construction for more stable operation. The requirement of this RFQ is almost same as the now-operating one; the resonant frequency is 324 MHz, the injection energy is 50 keV, the extraction energy is 3 MeV, peak beam current is 30 mA, and RF duty is 1.5%. The resonant frequency tuning during operation will be done by adjusting the temperatures of the cooling waters. We investigate with FEM model both cases; change vane water temperature and change cavity-wall water temperature. The frequency range was 0.35 MHz and 0.28 MHz, respectively. However in the transient analysis, the frequency change of the vane case was smaller than that of the cavity-call case. In this paper, thermal characteristics of this RFQ and control system of the cooling water temperature is described.

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