等离子体去旋器和透镜用于激光等离子体加速电子束的定制密度剖面
Plasma dechirper and lens for electron beams from laser wakefield acceleration in a tailored density profile
AI总结：
通过定制密度剖面控制电子束在横向动量和纵向相空间的加速与成形，实验观测到具有高质荷比和低能量展宽的电子束，其谱亮度达到8 pC/MeV/mrad。
摘要：
实现高质量电子束的关键在于通过定制密度剖面控制电子动力学过程。我们报告了在气体腔中通过等离子体密度定制实现电子束加速与成形的实验观测。测量到具有40 pC FWHM电荷、190 MeV能量、3.4%能量展宽和0.46 mrad rms发散度的电子束，对应横向动量展宽为0.2 $m_e c$。这些束的峰值谱亮度高达8 pC/MeV/mrad。使用实验参数进行的模拟显示，等离子体平板中的加速导致啁啾电子束，随后在等离子体下坡中经历横向动量展宽减少，再在10 mm长的等离子体尾部中去啁啾，最终形成测得的峰值谱。实验结果与有无长等离子体尾的对比验证了这一分析。
英文摘要：
Achieving high-quality electron beams from laser wakefield accelerators critically relies on density tailoring to control electron dynamics during injection, acceleration, and extraction. We report on the experimental observation of electron beam acceleration and shaping, in transverse momentum and longitudinal phase space, controlled by plasma density tailoring in a gas cell. Electron beams with a FWHM charge of 40 pC at an energy of 190 MeV, 3.4\% energy spread and an rms divergence of 0.46 mrad, corresponding to a transverse momentum spread of 0.2 $m_e c$, have been measured. These beams have a peak spectral brightness of up to 8 pC/MeV/mrad. Simulations using experimental parameters as input show that acceleration in the plasma plateau leads to chirped electron beams which then undergo transverse momentum spread reduction in a plasma down-ramp followed by dechirping in a 10~mm long plasma tail, leading to the measured peaked spectra. %\textcolor{blue}{A control experiment with and without the LPT confirms these results.} The comparison of experimental results with and without long plasma tail confirms this analysis.
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