2012 Fiscal Year Final Research Report
Study of particle transport in the ergodic layer based on the Doppler-free spectroscopy
| Project/Area Number |
21340174
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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 |
Plasma science
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| Research Institution | National Institute for Fusion Science |
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Principal Investigator |
GOTO Motoshi 核融合科学研究所, ヘリカル研究部, 准教授 (00290916)
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| Co-Investigator(Kenkyū-buntansha) |
SASAKI Koichi 北海道大学, 工学(系)研究科(研究院), 教授 (50235248)
MORITA Shigeru 核融合科学研究所, ヘリカル研究部, 教授 (80174423)
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| Project Period (FY) |
2009 – 2012
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| Keywords | ドップラーフリー分光 / 半導体レーザー / 水素原子 / ゼーマン効果 |
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| Research Abstract |
We have developed the technique of absorption spectroscopy for a hydrogen atom line with diode laser aiming at determination of the ionization location of hydrogen atoms in fusion plasma. An ultra-high wavelength resolution that is never available with usual emission spectroscopy technique has been realized with a relatively simple measurement system. Furthermore, we have observed several interesting phenomena like unexpected large tail components and anomalous crossover signals that could be related to the momentum relaxation mechanism of particles in plasma.
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