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Description
Ultra-compact multi-particle SC cyclotron being developed by CIAE is intended to be a high intensity cyclotron, especially for H2+ particle and particle acceleration. Two half-wavelength RF cavities are installed in the valleys of the main magnet independently. The high dynamic beam loading requires high reliability and robust for RF cavity. The structural design and machining process for the two RF Cavities are dedicated investigated. Four kinds of electrical contact technologies such as welding, crimping, spring finger contact and metal wire mesh contact are applied in the structural design of RF cavity to provide flexible and efficient contact, ensure the continuity of surface current path, and then improve the quality factor, Q-value. Based on the analysis of structural deformation and tolerance control, support structure with adjustment function for stems is designed to enhance cavity structure stability under operational conditions as well as the positioning fixtures developed to eliminate the possible errors in the cavity assemble process. The machining process related with water-cooling channel machining, surface treatment, quality verification is also presented in this paper. The RF cavity mechanical design and research show that it provides fundamental basis for the realization of high-performance RF cavities in this ultra-compact multi-particle SC cyclotron.
Footnotes
*: Corresponding Author, Dr. Pengzhan Li, Email: lipengzhan@cnncmail.cn
Funding Agency
This work was supported by the National Natural Science Foundation of China under Grant of 12427810.
