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Kondo, Yasuhiro; Hirano, Koichiro; Ito, Takashi; Kikuzawa, Nobuhiro; Kitamura, Ryo; Morishita, Takatoshi; Oguri, Hidetomo; Okoshi, Kiyonori; Shinozaki, Shinichi; Shinto, Katsuhiro; et al.
Journal of Physics; Conference Series, 1350, p.012077_1 - 012077_7, 2019/12
Times Cited Count：1 Percentile：52.28(Physics, Particles & Fields)We have upgraded a 3-MeV linac at J-PARC. The ion source is same as the J-PARC linac's, and the old 30-mA RFQ is replaced by a spare 50-mA RFQ, therefore, the beam energy is 3 MeV and the nominal beam current is 50 mA. The main purpose of this system is to test the spare RFQ, but also used for testing of various components required in order to keep the stable operation of the J-PARC accelerator. The accelerator has been already commissioned, and measurement programs have been started. In this paper, present status of this 3-MeV linac is presented.
Kobayashi, Fuminori; Kamiya, Junichiro; Takahashi, Hiroki; Suzuki, Yasuo*; Tasaki, Ryuta*
no journal, ,
The vacuum equipment in the L3BT beamline of J-PARC LINAC is controlled by the vacuum system in each area divided by beamline gate valves (BLGVs). In the past, the vacuum system controlled the vacuum equipment by area between BLGVs and did not monitor information about the equipment or vacuum pressure between each other. As a result, equipment can be operated regardless of conditions in adjacent areas, causing problems such as sudden deterioration of vacuum pressure in high vacuum areas and equipment failure due to atmospheric inrushes into vacuum equipment in operation. In addition, since all BLGVs are designed to close simultaneously when an interlock (ILK) occurs due to pressure deterioration, BLGVs in areas unaffected by vacuum deterioration are also forced to close. It is necessary to take measures to make BLGVs operate more appropriately in terms of the number of open/close limits and wear. To solve these various problems, it is first necessary to eliminate human error and increase safety by making it possible to monitor information on equipment and vacuum pressure between areas. Furthermore, it is necessary to improve maintainability by automatically controlling each BLGV individually. Therefore, we have modified and constructed the vacuum system control system with the aim of realizing safe and efficient maintenance and operation of the L3BT vacuum system.
