2011 Fiscal Year Final Research Report
Start-up and control of a spherical tokamak plasma using pressure driven current
| Project/Area Number |
21246137
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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 | 一般 |
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| Research Field |
Nuclear fusion studies
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| Research Institution | The University of Tokyo |
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Principal Investigator |
EJIRI Akira 東京大学, 大学院・新領域創成科学研究科, 准教授 (30249966)
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| Co-Investigator(Kenkyū-buntansha) |
NAGASHIMA Yoshihiko 東京大学, 大学院・新領域創成科学研究科, 助教 (90390632)
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| Co-Investigator(Renkei-kenkyūsha) |
TAKASE Yuichi 東京大学, 大学院・新領域創成科学研究科, 教授 (70292828)
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| Project Period (FY) |
2009 – 2011
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| Keywords | 球状トカマク / 電流駆動 / 高周波 / 平衡 / トムソン散乱 |
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| Research Abstract |
The objectives of the research are understanding and control of RF wave start-up/sustainment of spherical tokamak(ST) plasmas. We have succeeded in the sustainment of ST plasma with lower hybrid(LH) range of frequency wave, which is applied to an ST for the first time. After the improvement of accuracy and reliability of equilibrium analysis, we compared equilibria of different scenarios, and we found that the equilibria of RF sustained ST plasmas are characterized by a relatively high(one or larger than one) poloidal beta. By injecting directive LH wave, it was found that the wave generates high energy electrons, which contribute to the plasma current. The residual plasma current seems to be pressure driven current.
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