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DEVELOPMENT OF LLRF CONTROL SOFTWARE FOR THE J-PARC 400 MeV LINAC
Zhigao Fang, Shinichiro Michizono, S. Anami, S. Yamaguchi, F. Naito, Y. Fukui, H. Suzuki, E. Chishiro, Shinichi Shinozaki
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Abstract
The output energy of the J-PARC proton LINAC will be upgraded from 181 to 400 MeV in the next two years by adding 972-MHz high-b acceleration sections. Recently, the LLRF control software has been upgraded for the J-PARC LINAC, especially for the 972-MHz high-b systems. Many functions have been added to the LLRF control software, such as 1) gradually increasing the feedback gains in the feedback loop instead of fixed ones, 2) automatic chopped-beam compensation, 3) automatically switching the beam loading compensation in accordance with the different beam operation mode, 4) input rf-frequency tuning carried out by a FPGA to match the rf cavities during the rf start-up, and 5) auto-tuning of the rf cavity tuner by detecting the phase curve of the rf cavity during the field decay instead of the phase difference between the cavity input and output signals. The details of the development of LLRF control software for the J-PARC 400 MeV LINAC will be described in this paper.