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Water window soft X-ray emission from Au plasmas generated with a picosecond laser pulse
https://repo.qst.go.jp/records/72995
https://repo.qst.go.jp/records/72995910cdffb-d340-483e-b6fd-997db0251a21
| 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 | Water window soft X-ray emission from Au plasmas generated with a picosecond laser pulse | |||||
| 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 |
Kakunaka, N.
× Kakunaka, N.× John, C.× 岸本, 牧× Matsumoto, Y.× 長谷川, 登× 錦野, 将元× Higashiguch, T.× Ejima, T.× Sunahara, A.× Nakajima, F.× Johzaki, T.× Endo, T.× Namba, S.× 岸本 牧× 長谷川 登× 錦野 将元 |
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| 抄録 | ||||||
| 内容記述タイプ | Abstract | |||||
| 内容記述 | Water window (WW) soft X-rays (wavelength 2.3 to 4.4 nm) are easily absorbed by carbon and are hardly absorbed by water around the living cells. Therefore, X-ray microscopy using WW soft X-ray is expected as a technology for observing nanometer scale structure of living cells. In order to obtain a high spatial resolution image with a soft X-ray microscope, a high intensity soft X-ray source is necessary, and usually high-power lasers of 10 J or more is indispensable. This is a major obstacle to spread and development of soft X-ray microscopes in medical and biological research fields. Recently, it has been found that when a gold target is irradiated with a commercial Nd:YAG laser (1064 nm, 7 ns, 1 J) under low-pressure nitrogen atmospheres up to 400 Pa, Soft X rays intensity emitted from plasmas increase significantly. Accordingly, a compact and low-cost X-ray microscope can be expected. In this study, in order to generate hot dense plasmas emitting much bright X-ray radiation, picosecond lasers with 10-ps and 500-ps pulse durations were employed. Gas fill circumstance is achieved by introducing nitrogen gas using a mass flow controller. For the soft X-ray measurement, a grazing incidence spectrometer (flat field grating of 2400 grooves / mm) with a toroidal focusing mirror is used. A pinhole camera with an aperture of 0-micron in diameter is also installed to measure two-dimensional X-ray imaging (magnification of 14×). To block the out-of-band radiation, appropriate thin filters are inserted in the pinhole tube. In this presentation, we will also report the influence on nitrogen gas fill circumstances by using picosecond laser pulses. |
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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 | |||||
