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Report No.

Coupling cavity designs of the RF input coupler tests for the IFMIF/EVEDA prototype RFQ linac

Maebara, Sunao; Ichikawa, Masahiro

In the design of prototype RFQ linac for the IFMIF/EVEDA Project, a 175 MHz RFQ, which has a longitudinal length of 9.78 m, was proposed to accelerate deuteron beam up to 5 MeV. The operation frequency of 175 MHz was selected to accelerate a large current of 125 mA in CW mode. The overall driving RF power of 1.28 MW by 8 RF input couplers has to be injected to the RFQ cavity. For the transmitted RF power tests of RF couplers, a coupling cavity to connect with two RF couplers is needed. For this purpose, two types of coupling cavity for the 175 MHz have been designed. One is a capacitive coupling cavity with the 6 1/8 inch co-axial waveguide and double loop coupling structures, and the other one is a ridge cavity type with a rectangular waveguide. In this article, these RF designs and engineering designs will be presented in details.



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