2017 Fiscal Year Final Research Report
Measurement of the electron velocity distribution function using polarization modulation spectroscopy at the non-inductive startup phase of tokamak plasmas
| Project/Area Number |
16K14527
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| Research Category |
Grant-in-Aid for Challenging Exploratory Research
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| Allocation Type | Multi-year Fund |
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| Research Field |
Nuclear fusion studies
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| Research Institution | Kyoto University |
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Principal Investigator |
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| Project Period (FY) |
2016-04-01 – 2018-03-31
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| Keywords | 核融合 / トカマク / ECH / ECR / 電子速度分布 / 偏光 / 光弾性変調器 |
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| Outline of Final Research Achievements |
The purpose of this study is to develop a diagnostic method to measure the temporal evolution of the electron velocity distribution (EVD) and to reveal electron dynamics during the non-inductive startup phase of a tokamak plasma using ECH. We obtained the following results. (1)A polarization spectroscopy system that can detect a polarization degree of less than 1% in atomic emission lines was developed. (2)A method to reduce the instrumental polarization produced by birefringence of the window and reflection at the vacuum chamber surface was established. (3)Polarization in helium atom emission lines was observed in an ECH plasma having parameters comparable to ECH tokamak plasmas. (4)The feasibility of collisional-radiative modeling required for the evaluation of the EVD shape was verified.
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| Free Research Field |
プラズマ計測
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