1999 Fiscal Year Final Research Report Summary
PLASMA TRANSPORT STUDY BY ANLYSIS FOR TRANSIENT RESPONSES TO APPLIED
| Project/Area Number |
09680462
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| Research Category |
Grant-in-Aid for Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Section | 一般 |
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| Research Field |
プラズマ理工学
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| Research Institution | KYUSHU UNIVERSITY |
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Principal Investigator |
ZUSHI Hideki KYUSHU UNIVERSITY RESEARCH INSTITUTE FOR APPLIED MECHANICS ADVANCED FUSION RESEARCH CENTER, PROFESSOR, 応用力学研究所, 教授 (20127096)
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| Co-Investigator(Kenkyū-buntansha) |
WAKATANI Masahiro KYOTO UNIVERSITY GRDUATE SCHOOL OF ENERGY SCIENCE, PROFESSOR, エネルギー科学研究科, 教授 (00109357)
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| Project Period (FY) |
1997 – 1999
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| Keywords | non-uniform perturbation / pellet / current drive / lower hybrid waves / local heating / confinement improvement |
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| Research Abstract |
The purpose of this research is to resolve the plasma transport by analysing transient responses to local non-uniform perturbations. The following results are obtained.
(1)In Heliotron E internal disruption and reduction of the fast ion loss by ECRH are investigated in 1997. The hysteresis relation between the amplitude of the perturbation and the pressure gradient is obtained during the internal disruption process. This observation requires a new explanation for this process, which cannot be described by the linear theory. Although ECRH heats the elctrons and creates energetic electrons, the potential profile can be also changed. When the plasma potential becomes more positive, the reduction of the resonant fast ion loss is expected. This process is experimentally confirmed.
(2)In TRIQM-1M ion heating have been studied in LHCD plasmas in 1998 The effect of the distortion of the electron velocity distribution function is studied on the ion heating process. It is found that low frequency waves are excited by distorted electron distribution and transfer their energy to ions with perpendicular velocity component.
(3)The coupling between bi-directional lower hybrid waves and current carrying electrons are investigated in 1999. It is found that the current drive efficiency for the co-moving electrons shows a non linear response for the power ratio of the bi-directional waves. The abrupt current profile change from a peaked one to a flat one is observed as the ctr-travelling wave power is increased.
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