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Study of near-GeV acceleration of electrons in a non-linear plasma wave driven by a self-guided laser pulse

S Kneip, S R Nagel, C Bellei, O Cheklov, R J Clarke, N Delerue, E J Divall, G Doucas, K Ertel, F Fiuza2011年Plasma Physics and Controlled FusionIF 2.2出版社

Electrons are accelerated up to 0.8 GeV in a self-injecting laser wakefield accelerator driven at a plasma density of 5.5 × 1018 cm−3 by a 10 J, 55 fs, 800 nm laser pulse in the blow-out regime. The electron beam stability is correlated with the laser focal spot pointing stability and depends on the target alignment. Variations of the laser pulse energy, focal spot size and energy within the full width at half maximum have little effect on the electron beam profile (stability) but impact the electron energy (stability). The peak electron energy is higher than expected for the initial vacuum intensity. This is evidence for intensity amplification which also explains the observation of polyenergetic beamlets.

日本語訳

電子は、ブローアウト領域において、10 J、55 fs、800 nmのレーザーパルスによって駆動される5.5 × 10¹⁸ cm⁻³のプラズマ密度での自己入射レーザー航跡場加速器において、0.8 GeVまで加速される。電子ビームの安定性は、レーザーフォーカルスポットのポインティング安定性と相関があり、ターゲットのアライメントに依存する。レーザーパルスエネルギー、フォーカルスポットサイズ、および半値全幅内でのエネルギーの変動は、電子ビームのプロファイル(安定性)にはほとんど影響を与えないが、電子エネルギー(安定性)には影響を与える。ピーク電子エネルギーは、初期真空強度から予想される値よりも高い。これは強度増幅の証拠であり、多エネルギービームレットの観測も説明する。

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