1997 Fiscal Year Final Research Report Summary
Research and Developments of Advanced Pellet Injector
| Project/Area Number |
07558191
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| Research Category |
Grant-in-Aid for Scientific Research (A)
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| Allocation Type | Single-year Grants |
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| Section | 展開研究 |
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| Research Field |
Nuclear fusion studies
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| Research Institution | National Institute for Fusion Science |
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Principal Investigator |
SUDO Shigeru National Institute for Fusion Science, LHD Project, Professor, 大型ヘリカル研究部, 教授 (50142302)
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| Co-Investigator(Kenkyū-buntansha) |
NISHINO Nobuhiro Hiroshima Univ., Technology division, Associate Professor, 工学部, 助教授 (70243590)
YAMADA Hiroshi National Institute for Fusion Science, LHD Project, Associate Professor, 大型ヘリカル研究部, 助教授 (20200735)
GOTO Shuichi Torisha Corporation. Technology division, Deputy manager, 技術副部長
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| Project Period (FY) |
1995 – 1997
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| Keywords | cryogenic pellet injector / pneumatic pipe gun pellet injector / repetitive refueling / porous copper disk / hydrogen isotope pellet |
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| Research Abstract |
A pellet injector of repetitive pneumatic pipe-gun type has been designed for advanced plasma fueling applications. This new concept is estimated to be able to reduce the time for pellet formation by an in situ technique from 3-5 minutes to 2-10 seconds. The basic idea of the new approach to pellet formation is to supply a hydrogen isotope pellet through a copper porous unit into a pipe-gun-type barrel. Two modes are possible : (1) to push liquid hydrogen isotope through a porous unit and re-freezing inside of the barrel, (2) to push solid hydrogen isotope through porous unit to the inside of the barrel. This principle provides a continuous injection of an unlimited amount of pellets. For demonstration of the proof-of-principle, several experiments have been carried out. Hydrogen pellets of 3 mm in diameter and 3 to 10 mm in length were accelerated to 1.2 km/s at rate of pellet per 10-34 s with a manually controlled injector operation. On the basis of this experience, we succeeded in 3 to 4 seconds repetition with high reliability.
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