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Observation of annular electron beam transport in multi-TeraWatt laser-solid interactions

P A Norreys, J S Green, J R Davies, M Tatarakis, E L Clark, F N Beg, A E Dangor, K L Lancaster, M S Wei, M Zepf2006年Plasma Physics and Controlled FusionIF 2.2出版社

Electron energy transport experiments conducted on the Vulcan 100 TW laser facility with large area foil targets are described. For plastic targets it is shown, by the plasma expansion observed in shadowgrams taken after the interaction, that there is a transition between the collimated electron flow previously reported at the 10 TW power level to an annular electron flow pattern with a 20° divergence angle for peak powers of 68 TW. Intermediate powers show that both the central collimated flow pattern and the surrounding annular-shaped heated region can co-exist. The measurements are consistent with the Davies rigid beam model for fast electron flow (Davies 2003 Phys. Rev. E 68 056404) and LSP modelling provides additional insight into the observed results.

日本語訳

Vulcan 100 TWレーザー施設において、大面積フォイルターゲットを用いて実施された電子輸送実験について述べる。プラスチックターゲットについては、インターフェログラムで観測されたプラズマ膨張により、10 TW出力レベルでこれまでに報告されたコリメートされた電子流から、68 TWのピーク出力における20度の発散角を持つ環状電子流への遷移が示される。中間的な出力では、中心部のコリメートされた流れパターンと周囲の環状加熱領域が共存し得ることが示される。これらの測定結果は、高速電子流に関するDaviesの剛体ビームモデル(Davies 2003 Phys. Rev. E 68 056404)と一致しており、LSPシミュレーションは観測結果に対するさらなる洞察を提供する。

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