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Observation of water-window soft X-ray emitted from laser plasmas generated in N2 gas atmospheres
https://repo.qst.go.jp/records/72994
https://repo.qst.go.jp/records/72994cd63583e-0a03-4647-baba-e56597f6bc42
| Item type | 会議発表用資料 / Presentation(1) | |||||
|---|---|---|---|---|---|---|
| 公開日 | 2018-11-07 | |||||
| タイトル | ||||||
| タイトル | Observation of water-window soft X-ray emitted from laser plasmas generated in N2 gas atmospheres | |||||
| 言語 | ||||||
| 言語 | eng | |||||
| 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 | |||||
| アクセス権 | ||||||
| アクセス権 | metadata only access | |||||
| アクセス権URI | http://purl.org/coar/access_right/c_14cb | |||||
| 著者 |
John, C.
× John, C.× Kakunaka, N.× Matsumoto, Y.× 岸本, 牧× Namba, S.× 岸本 牧 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Soft X-rays of the so-called water-window (WW) region (2.3-4.4 nm) are suitable as light sources in microscopes, which allow for observation of living specimen, providing spatial resolutions below 50 nm. Recently, it was found that the WW radiation increased, when an Au target was irradiated by the GEKKO XII laser (1053 nm, 500 ps, 120 J) under low-pressure nitrogen atmospheres up to 400 Pa. This increase could aid the resolution quality of X-ray microscopes significantly. For practical use in soft X-ray microscopes, a deep and comprehend understanding of the mechanism underlying the X-ray enhancement is essential. In this study, therefore, a set of experimental parameters, such as gas pressure, gas species, laser energy and pulse length, as well as target materials, are varied widely, to verify their influence on the X-ray enhancement. Nd:YAG-lasers (1064 nm) are used to shoot at a slab target through a lens of f=300mm/100mm. The Laser spot size amounts to 34 microns full width at half maximum (FWHM), granting an spatially averaged intensity of around 6 GW/cm 2 . The observation apparatus involves a grazing incidence spectrometer, featuring a toroidal mirror (TM) and a flat field grating (FFG). A second spectrometer that is installed on the other side, is equipped with a FFG and a thin filter. Additionally, a pinhole-camera observes a magnified image of the plasma X-ray image (64x) from the direction of 45° with respect to the target. The emission passes through several metal foil filters (e.g. Be and Ni), which allows for blocking of irrelevant spectral band. The experiments have proven the enhancement of the WW X-ray under presence of nitrogen atmosphere. In this presentation, we will describe some plausible reasons for the WW X-rays enhancement under N2 atmospheres in terms of atomic physics. |
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| 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 | 2nd Asia-Pacific Conference on Plasma Physics (AAPPS-DPP2018) | |||||
| 発表年月日 | ||||||
| 日付 | 2018-11-15 | |||||
| 日付タイプ | Issued | |||||
