関西光科学研究所 >> KPSIセミナー >> Studies of fast electrons emitted in intense laser-solid interaction experiments
セミナー
第3回KPSIセミナー
Studies of fast electrons emitted in intense laser-solid interaction experiments
| 講演者 | Prof. David NEELY （ラザフォード・アップルトン研究所／ストラックライド大学, イギリス） |
|---|---|
| 職位 | STFC Fellow |
| 場所 | 関西光科学研究所 ITBL棟 G201号室 |
| 日時 | 5月16日（月曜日）11時00分～12時00分 |
| 使用言語 | 英語 |
| 座長 | 近藤 公伯 |
Studies of fast electrons emitted in intense laser-solid interaction experiments
Prof. David NEELY
（ラザフォード・アップルトン研究所／ストラックライド大学, イギリス）
概要
The transport of high currents of electrons which are created inside solid targets when irradiated at intensities of >10^18 Wcm^-2 determines the magnitude of the sheath fields present on the rear of the target from which ions can be accelerated. For many applications, understanding the interplay between the internal electrons, the escaping electron fraction and the transfer of energy to secondary ions is central to being able to develop new sources.
In studies carried out using ps pulses at 1.05 microns, the angular escaping ion and electron fluxes^1 were characterized and the total energy content evaluated as a function of intensity. Under suitable conditions, the conversion of the incident laser energy into either escaping electrons or ions can readily exceed 10%. As the intensity is increased, by decreasing the focal spot area using constant laser drive energy, the total energy of the escaping electrons reaches a maximum and then decreases. The explanation for this experimental observation in terms of the magnitude and area of the sheath field will be presented and the implications for future experiments explored.
Recent developments of high efficiency plasma mirrors (96%) and way of attaining ultra high intensities will also be presented.
参照：
[1] D Rusby /et al,/ /Measurement of the Angle, Temperature and Flux of Fast Electrons,/Journal of Plasma Physics, 81, 05, 47581050, 2015
[2] C. Brenner /et al, High energy conversion efficiency in laser-proton acceleration by controlling laser-energy deposition onto thin foil targets/, Applied Physics Letters, 104, 081123, 2014
[3] G. Scott/et al/, /Optimization of plasma mirror reflectivity and optical quality using double laser pulse,s/ New J. Physics, 17, 033027, 2015
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