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  1. システム情報系 (Faculty of Engineering, Information and Systems)
  2. 嶋村 耕平 (Shimamura Kohei)
  1. システム情報系 (Faculty of Engineering, Information and Systems)
  2. 横田 茂 (Yokota Shigeru)
  1. コンテンツタイプ (Contents Type)
  2. 雑誌発表論文等 (Journal article, etc.)
  3. J~
  4. Journal of applied physics

Characterization of the fast ionization wave induced by a CO2 laser pulse in argon

http://hdl.handle.net/2241/00161478
22ecb025-0561-4ec7-aa36-1a0b2895e5fb
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JAP_126-24.pdf JAP_126-24 (2.2 MB)
item type Journal Article(1)
公開日 2020-09-28
タイトル
言語 en
タイトル Characterization of the fast ionization wave induced by a CO2 laser pulse in argon
言語
言語 eng
資源タイプ
タイプ journal article
著者 嶋村, 耕平

× 嶋村, 耕平

WEKO 188316
e-Rad 90736183
筑波大学研究者総覧 0000003542

嶋村, 耕平

ja-Kana シマムラ, コウヘイ

en SHIMAMURA, Kohei

Search repository
横田, 茂

× 横田, 茂

WEKO 205021
e-Rad 30545778
筑波大学研究者総覧 0000003541

横田, 茂

ja-Kana ヨコタ, シゲル

en YOKOTA, Shigeru

Search repository
Yokota, Ippei

× Yokota, Ippei

WEKO 223027

en Yokota, Ippei

Search repository
抄録
内容記述 Fast ionization wave (FIW), a postbreakdown phenomenon of laser-induced plasma, is observed for a laser intensity of 1011–1013 W/m2 using the CO2 laser pulse in the atmospheric pressure condition. FIW is distinguishable as “overdriven detonation” according to Raizer's Chapmann-Jouguet detonation theory because FIW is known as the type of laser-absorption wave that has a higher propagation velocity than the laser-supported detonation wave (LSDW). Some reports have described the expansion of FIW using a solid-state laser. Nevertheless, the threshold phenomena between FIW and LSDW are not fundamentally understood. This study used the high-speed visualization and optical emission spectroscopy to investigate the transition of the laser-absorption wave in argon gaseous form. To elucidate the physics of the transition threshold, a 5 J CO2 pulse laser, an Echelle spectrometer, and an intensified CCD camera are used for the quantitative investigation of the plasma temperature and density. Results demonstrate that the FIW front had an electron temperature of 0.7 eV and an electron number density of 2.5 × 1023 m−3. At the FIW–LSDW transition, the electron temperature increased by 1 eV, and the density decreased by 2.2 × 1023 m−3. Besides, the transition threshold and the existence of local-thermodynamic equilibrium were evaluated based on the electron temperature, and the density was obtained from the spectroscopic experiments.
書誌情報 en : Journal of Applied Physics

巻 126, 号 24, p. 243304, 発行日 2019-12
ISSN
収録物識別子 0021-8979
書誌レコードID
収録物識別子 AA00693547
DOI
関連識別子
関連識別子 10.1063/1.5115815
権利
権利情報 © 2019 Author(s).
権利
権利情報 This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in Journal of Applied Physics 126, 24, 243304 (2019) and may be found at https://doi.org/10.1063/1.5115815.
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出版者 AIP Publishing
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