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Report No.
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Reference design of the RFQ for JAEA ADS linac

Kondo, Yasuhiro ; Tamura, Jun ; Yee-Rendon, B. 

The Radio Frequency Quadrupole (RFQ) is one of the key components which realize modern high-intensity ion linacs. It is true of the linac for Accelerator Driven Subcritical System (ADS) for the transmutation of nuclear waste. The Japan Atomic Energy Agency (JAEA) is proceeding the ADS project including a 30-MW continuous-wave (CW) proton linac to drive a subcritical reactor. The required beam current is 20 mA and the energy at the exit of the RFQ is set to 2.5 MeV in current design. The RFQ is the only normal conducting cavity and extremely high reliability is also required as with the other super conducting cavities. By adopting the lower operation frequency, the inter-vane voltage of the RFQ can be reduced; this results in the lower discharging probability. The heat dissipation to the RFQ is also reduced with the lower frequency. To this end, the half operation frequency of the low-beta region of the J-PARC linac is adopted for the low-beta region of the JAEA-ADS linac: it is possible because the beam current is also half of the J-PARC linac. To obtain the reference design of this 162-MHz RFQ, we used the very traditional RFQ design code, RFQuick. In this paper, the results of the reference design of the RFQ for the JAEA-ADS linac are presented.

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