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Power-balance control by Slug Tuner for the 175MHz Radio-Frequency quadrupole (RFQ) linac in IFMIF project

Maebara, Sunao; Moriyama, Shinichi; Saigusa, Mikio*; Sugimoto, Masayoshi; Imai, Tsuyoshi*; Takeuchi, Hiroshi

For tuning the 175MHz RFQ used in the baseline design of IFMIF, the RF power-balance control by slug tuner is indispensable because the RF power-balance for quadrupole operation mode (TE$$_{210}$$) in each RFQ quadrant will be affected by the insertion of the loop antennas and pick-up coils. In this study, RF power-balance recovery by slug tuners have been measured by using a low power module of 175MHz RFQ mock-up. The optimal insertion depth of loop antenna was determined to be 3 cm for realizing the appropriate phase differences of TE$$_{210}$$ mode. Under this condition, cylindrical slug tuners were inserted, and S$$_{21}$$ parameters in each cavity were measured. As a typical result, RF power-balance control less than 20% error can be achieved in case of $$phi$$3cm tuner up to 3cm insertion.

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Category:Nuclear Science & Technology

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