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Ionization injection effects in x-ray spectra generated by betatron oscillations in a laser wakefield accelerator

K T Behm, T Z Zhao, J M Cole, A Maksimchuk, S P D Mangles, J Nees, J C Wood, V Yanovsky, K Krushelnick, A G R Thomas2016年Plasma Physics and Controlled FusionIF 2.2出版社

Single photon counting techniques were used with an x-ray CCD camera to measure features of synchrotron-like x-ray spectra generated by betatron oscillations of electrons in a laser wakefield accelerator (LWFA) with different injection techniques. Measurements were made using the Hercules laser system at the University of Michigan. With a single stage gas cell, we demonstrate that pure helium gas in our wakefield accelerator will produce spectra with higher critical energies than when helium mixed with nitrogen is used. This result was not evident when a two stage gas cell was used.

日本語訳

単一光子計数法をX線CCDカメラと併用し、異なる入射手法を用いたレーザー航跡場加速器(LWFA)における電子のベータトロン振動によって生成されるシンクロトロン様X線スペクトルの特性を測定した。測定はミシガン大学のHerculesレーザーシステムを用いて行われた。単段ガスセルを用いた場合、我々の航跡場加速器において純ヘリウムガスは、ヘリウムと窒素の混合ガスを用いた場合よりも高い臨界エネルギーを持つスペクトルを生成することを実証した。この結果は、二段ガスセルを用いた場合には明らかではなかった。

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