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Spectral control in proton acceleration with multiple laser pulses

A P L Robinson, D Neely, P McKenna, R G Evans2007年Plasma Physics and Controlled FusionIF 2.2出版社

We address the question of whether multiple high intensity (>1018 W cm−2) laser pulses (each O(100 fs)) can produce proton beams with a modified energy spectrum on irradiating a foil target. This has been studied in one dimension with both Vlasov and particle-in-cell codes. A reduction in the maximum proton energy, and the generation of spectral peaks, is observed. This is the first theoretical demonstration of spectral peak generation by purely optical means. The mechanism, which has been termed multiple pulse sheath acceleration, that produces these spectral peaks is described, and the same mechanism occurs in both sets of simulations.

日本語訳

我々は、フォイルターゲットを照射する際に、複数の高強度(>10^18 W cm^-2)レーザーパルス(各O(100 fs))が、修正されたエネルギースペクトルを持つ陽子ビームを生成できるかどうかという問いに取り組む。これは、ヴラソフコードとパーティクルインセルコードの両方を用いて一次元で研究されてきた。最大陽子エネルギーの減少と、スペクトルピークの生成が観測される。これは、純粋に光学的な手段によるスペクトルピーク生成の最初の理論的実証である。これらのスペクトルピークを生成する、マルチパルスシース加速と名付けられたメカニズムが記述され、同じメカニズムが両方のシミュレーションセットで発生する。

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Proton acceleration
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