| Project/Area Number |
10480109
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| Research Category |
Grant-in-Aid for Scientific Research (B)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
Nuclear fusion studies
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| Research Institution | Natiomal Institute for Fusion Science |
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Principal Investigator |
SUDO Shigeru Natiomal Institute for Fusion Science Department of Large Helical Device Project, Professor, 大型ヘリカル研究部, 教授 (50142302)
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| Co-Investigator(Kenkyū-buntansha) |
OZAKI Tetsuo Natiomal Institute for Fusion Science Department of Large Helical Device Project,Associate Professor, 大型ヘリカル研究部, 助教授 (50183033)
KONDO Katusmi Kyuto University,Graduate School of Energy science,Professor, 大学院・エネルギー科学研究部, 教授 (30026314)
MATSUOKA Keisuke Natiomal Institute for Fusion Science Department of Large Helical Device Project,Professor, 大型ヘリカル研究部, 教授 (70023736)
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| Project Period (FY) |
1998 – 2001
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| Project Status |
Completed (Fiscal Year 2001)
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| Budget Amount *help |
¥11,500,000 (Direct Cost: ¥11,500,000)
Fiscal Year 2001: ¥1,400,000 (Direct Cost: ¥1,400,000)
Fiscal Year 2000: ¥4,600,000 (Direct Cost: ¥4,600,000)
Fiscal Year 1999: ¥2,300,000 (Direct Cost: ¥2,300,000)
Fiscal Year 1998: ¥3,200,000 (Direct Cost: ¥3,200,000)
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| Keywords | Particle transport / Tracer-encapsulated pellet / Impurity transport / Pellet ablation / Local transport / TESPEL / 粒子輸送 / トレーサー内蔵ペレット / 局所粒子輸送係数 / リチウム荷電交換再結合光 / ペレット溶発光 |
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| Research Abstract |
A method using a flexible tracer-encapsulated solid pellet (TESPEL) has been developed for transport study on the Large Helical Device (LHD). The method has flexibility in the selection both of size of the pellet and of the tracer material. The size of the outer layer made of polystyrene can be changed from 300 \JLTO. to 900 \Lia in diameter. This contributes to the wide selection of the deposition location of the tracer particles in the plasma. The flexibility in the selection of the tracer material contributes to the appropriate selection of the atoms according to the plasma parameters such as Te in the concerned plasma. The amount of the tracer particles (typical number is 1017 particles) can be changed easily by more than a factor of 50. TESPEL consists of polystyrene as an outer part and another material as an inner core. At first, it was confirmed at the CHS that the tracer of lithium was deposited locally in the plasma. Moreover, the behavior of the tracer particles was observed clearly by charge exchange recombination spectroscopy using a heating neutral beam. TESPEL was also injected into the LHD. In this case, the Ka line and the other spectra in the vacuum ultra violet region of titanium were observed without necessity of a neutral beam. Those multi-chord data with temporal resolution of about 20 ms were compared with the impurity transport simulation with the codes such as MIST and STRAHL. Thus, the particle diffusion coefficient and the inward pinch velocity were obtained for various plasmas. Those results have shown that this method is promising.
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