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Report No.

Status of the ACS cavity development for the J-PARC linac energy upgrade

Ao, Hiroyuki; Hirano, Koichiro ; Morishita, Takatoshi ; Asano, Hiroyuki; Naito, Fujio*; Ueno, Akira ; Ikegami, Masanori*; Hasegawa, Kazuo; Yamazaki, Yoshishige; Paramonov, V.*

The J-PARC ACS cavity consists of many cell parts. For the mass production, the ACS requires about 1300 cell parts, so that it is important to reduce the machining time. In the previous ACS model, it took about three hours per one coupling slot. We, therefore, optimized the slot design, the tolerance, and the machining process. As a result, the machining time reduced to forty-five minutes per one slot. The four test cells were fabricated to measure the frequencies and Q-values, and these results were compared with the electromagnetic analysis with the Microwave Studio. Between the analysis and the measurement, the differences are 1$$sim$$1.5 MHz and 4$$sim$$5 MHz, respectively, for the accelerating mode, and for the coupling mode.



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