Investigation of GeV-scale electron acceleration in a gas-filled capillary discharge waveguide
Investigation of GeV-scale electron acceleration in a gas-filled capillary discharge waveguide
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DOI：
10.1088/1367-2630/15/4/045024
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发表时间：
2013
影响因子：
3.3
通讯作者：
P. A. Walker;N. Bourgeois;W. Rittershofer;J. Cowley;N. Kajumba;A. Maier;J. Wenz;C. Werle;S. K
中科院分区：
文献类型：
--
作者：
P. A. Walker;N. Bourgeois;W. Rittershofer;J. Cowley;N. Kajumba;A. Maier;J. Wenz;C. Werle;S. K
本文讨论了在充气毛细管放电波导中产生GeV量级电子束的问题。在等离子体密度为2.2 × 1018 cm−3和峰值输入激光功率为55 TW的情况下，观察到能量超过900 MeV、均方根发散度为3.5 mrad的电子束。测量了最大电子能量随等离子体密度的变化，发现与简单模型吻合得很好。本文报道了在迄今为止最低等离子体密度为3.2 × 1017 cm−3时电子的注入和加速。所产生的电子束的能谱表现出良好的拍摄到拍摄的再现性，与所观察到的变化归因于所测量的拍摄到拍摄的激光参数的抖动。本文介绍了两种校正光束指向变化对测量能谱影响的方法。
The generation of GeV-scale electron beams in a gas-filled capillary discharge waveguide with good reproducibility is discussed. Beams of electrons with energies above 900 MeV, and with root-mean-square divergences of 3.5 mrad, are observed for a plasma density of 2.2 × 1018 cm−3 and a peak input laser power of 55 TW. The variation of the maximum electron energy with the plasma density is measured and found to agree well with simple models. Injection and acceleration of electrons at the to date lowest plasma density of 3.2 × 1017 cm−3 are reported. The energy spectra of the generated electron beams exhibit good shot-to-shot reproducibility, with the observed variations attributable to the measured shot-to-shot jitter of the laser parameters. Two methods for correcting the effect of beam pointing variations on the measured energy spectrum are described.