Developments of Mutiple Pellet Injectors

Research Project

Project/Area Number	60460223
Research Category	Grant-in-Aid for General Scientific Research (B)
Allocation Type	Single-year Grants
Research Field	プラズマ理工学
Research Institution	Kyoto University
Principal Investigator	SUDO Shigeru Plasma Physics Laboratory, Kyoto University, ヘリオトロン核融合研究センター, 助教授 (50142302)
Co-Investigator(Kenkyū-buntansha)	MIZUUCHI Tohru Plasma Physics Laboratory, Kyoto University, ヘリオトロン核融合研究センター, 助手 (20135619) KANEKO Hiroshi Plasma Physics Laboratory, Kyoto University, ヘリオトロン核融合研究センター, 助手 (80127068) KONDO Katsumi Plasma Physics Laboratory, Kyoto University, ヘリオトロン核融合研究センター, 助手 (30026314) SATO Motoyasu Plasma Physics Laboratory, Kyoto University, ヘリオトロン核融合研究センター, 助教授 (60115855) MOTOJIMA Osamu Plasma Physics Laboratory, Kyoto University, ヘリオトロン核融合研究センター, 教授 (60109056) 森本茂行京都大学, ヘリオトロン核融合研究センター, 助教授 (20026248)
Project Period (FY)	1985 – 1987
Project Status	Completed (Fiscal Year 1987)
Budget Amount *help	¥7,600,000 (Direct Cost: ¥7,600,000) Fiscal Year 1987: ¥800,000 (Direct Cost: ¥800,000) Fiscal Year 1986: ¥2,500,000 (Direct Cost: ¥2,500,000) Fiscal Year 1985: ¥4,300,000 (Direct Cost: ¥4,300,000)
Keywords	Multiple Pellet Injector / Plasma / Gas Gun type / 遠心力方式
Research Abstract	Two types of multiple pellet injectors are constructed and tested; (1) By an extrunder type, 5 pellets are shot out in one sequence. But, the time interval is limited at about 150 ms. The reason may be due to the residual propellant gas near the exterunding point. (2) By a rotating disk type, 6 pellets are shot out in the same time, and also delayed (30-50 ms). The pellet valocity is 1.1 Km/s. This type is very useful for pellet injection experiments in Heliotron E. the other two types, that is, (3) pipe gun type, and (4) centrifugal type, are designed. These seem to be also promising. The driving mechanism for changing pellet flight direction is developed for increasing flexibility of density profile control. The pellet ablation is also expermentally studied by using a fast camera (20 us exposure time).