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Gamma-ray irradiation effects on optical coatings and polarizers for edge Thomson scattering system in ITER
https://repo.qst.go.jp/records/79630
https://repo.qst.go.jp/records/79630a87463a0-ee4d-4573-ac99-239115eccbaf
| 名前 / ファイル | ライセンス | アクション |
|---|---|---|
2019_09_Yatsuka_ISFNT14_Poster2.pdf (2.0 MB)
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| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2020-03-24 | |||||
| タイトル | ||||||
| タイトル | Gamma-ray irradiation effects on optical coatings and polarizers for edge Thomson scattering system in ITER | |||||
| 言語 | ||||||
| 言語 | jpn | |||||
| 資源タイプ | ||||||
| 資源タイプ識別子 | http://purl.org/coar/resource_type/c_c94f | |||||
| 資源タイプ | conference object | |||||
| 著者 |
谷塚, 英一
× 谷塚, 英一× 鳥本, 和弘× 石川, 正男× 波多江, 仰紀× Yatsuka, Eiichi× Torimoto, Kazuhiro× Ishikawa, Masao× Hatae, Takaki |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | This paper reports the gamma-ray irradiation effects on optical coatings and polarizers to be used in the ITER edge Thomson scattering system (ETS). Outside a diagnostic port-plug, in the Interspace, a total dose of the order of 1 MGy is expected through 20 years of ITER operation. In this study, gamma-ray irradiation experiments were performed up to 10 MGy. A high peak power laser beam, i.e. a pulse energy of 5 J and a pulse duration of ~4 ns, is needed for a Thomson scattering measurement in ITER. Laser-induced damage threshold (LIDT) of anti-reflection (AR) and high-reflection (HR) coatings at the laser wavelengths after gamma-ray irradiation were investigated. Contrary to expectation, LIDT of AR coating is more likely higher for the irradiated samples at a wavelength of 1064 nm. Regarding HR coatings, LIDT was not noticeably degraded by gamma-ray irradiation. Regarding polarizers, no degradation of transmission and extinction ratio was observed at visible and near infrared wavelength ranges when a wire-grid polarizer substrate is made of fused silica. Since a signal of ETS is almost linearly polarized, a wire-grid polarizer enables to improve signal to noise ratio of electron temperature and density measurements by Thomson scattering in ITER. | |||||
| 会議概要（会議名, 開催地, 会期, 主催者等） | ||||||
| 内容記述タイプ | Other | |||||
| 内容記述 | The 14th International Symposium on Fusion Nuclear Technology | |||||
| 発表年月日 | ||||||
| 日付 | 2019-09-24 | |||||
| 日付タイプ | Issued | |||||
