| Item type |
学術雑誌論文 / Journal Article(1) |
| 公開日 |
2021-07-20 |
| タイトル |
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タイトル |
Measurement of polarization in Lyman-α line caused by anisotropic electron collisions in LHD plasma |
| 言語 |
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言語 |
eng |
| キーワード |
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主題Scheme |
Other |
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主題 |
Polarization |
| キーワード |
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主題Scheme |
Other |
|
主題 |
Lyman-α line |
| キーワード |
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主題Scheme |
Other |
|
主題 |
Anisotropy |
| キーワード |
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主題Scheme |
Other |
|
主題 |
Electron cycloton heating |
| キーワード |
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主題Scheme |
Other |
|
主題 |
VUV spectrometer |
| キーワード |
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主題Scheme |
Other |
|
主題 |
Half-waveplate |
| キーワード |
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主題Scheme |
Other |
|
主題 |
Brewster's angle |
| キーワード |
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主題Scheme |
Other |
| 資源タイプ |
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資源タイプ識別子 |
http://purl.org/coar/resource_type/c_6501 |
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資源タイプ |
journal article |
| 著者 |
Ramaiya, Nilam
GOTO, Motoshi
Seguineaud, Guillaume
OISHI, Tetsutarou
MORITA, Shigeru
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| 著者ID |
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内容記述タイプ |
Other |
|
内容記述 |
0000-0002-4668-4087 |
| 抄録 |
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内容記述タイプ |
Abstract |
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内容記述 |
Polarization in the Lyman-α line caused by anisotropic electron collisions has been investigated in the Large Helical Device (LHD). High-sensitivity polarization-resolved measurements of the Lyman-α line from edge LHD plasma have been carried out. To obtain spectra of linearly polarized light at all angles a high-reflectivity mirror, a polarization analyzer, and a half-waveplate have been additionally installed into an existing VUV spectrometer system. These optical components have been designed and developed by the CLASP (Chromospheric Lyman-Alpha Spectro-Polarimeter) [R Kano et al. ApJL, 839(1):L10, 2017] team. The present measurement has been made during an electron cyclotron heated discharge. Intensity of the Lyman-α line integrated over line profile has been obtained and plotted as a function of time to generate temporal profile of line. The profile shows that intensity of light varies in synchronization with the angle of the observed linearly polarized light, which clearly indicates that the line is polarized. By performing least-squares fitting on the temporal profile, the magnitude of polarization degree has been evaluated to be 0.033 ± 0.004. In addition, phase analysis of the measured intensity variation has been carried out. From this analysis it has been found that the observed polarization in Lyman-α can be attributed to the anisotropic electron velocity distribution function (EVDF) at the inboard side of LHD plasma. The preliminary results of a simulation model code suggest that the value of polarization degree is negative and electron temperature in the perpendicular direction to the magnetic field is higher compared to electron temperature in the parallel direction. Therefore, the final value of polarization degree in Lyman-α is -0.033 ± 0.004. |
| 書誌情報 |
Journal of Quantitative Spectroscopy and Radiative Transfer
巻 260,
p. 107430,
発行日 2021-02
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| 出版者 |
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出版者 |
ELSEVIER |
| ISSN |
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収録物識別子タイプ |
ISSN |
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収録物識別子 |
0022-4073 |
| 書誌レコードID |
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収録物識別子タイプ |
NCID |
|
収録物識別子 |
AA0070576X |
| DOI |
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関連タイプ |
isVersionOf |
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識別子タイプ |
DOI |
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関連識別子 |
10.1016/j.jqsrt.2020.107430 |
| 権利 |
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|
権利情報 |
© <2021>. This manuscript version is made available under the CC-BY-NC-ND 4.0 license http://creativecommons.org/licenses/by-nc-nd/4.0/ |
| 情報源 |
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関連名称 |
Ramaiya, N.; Goto, M.; Seguineaud, G.; Oishi, T.; Morita, S. Measurement of polarization in Lyman-α line caused by anisotropic electron collisions in LHD plasma. J. Quant. Spectrosc. Radiat. Transf. 2020, 260, 107430. |
| 関連サイト |
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|
識別子タイプ |
DOI |
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関連識別子 |
https://doi.org/10.1016/j.jqsrt.2020.107430 |
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関連名称 |
Publisher version |
| 著者版フラグ |
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出版タイプ |
AM |
|
出版タイプResource |
http://purl.org/coar/version/c_ab4af688f83e57aa |
| NAIS |
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|
12387 |
J.Quantit.Spectrosc.Radiat.Transf.260_pp107430 (1.2 MB)
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