Quantitative single shot and spatially resolved plasma wakefield diagnostics
Quantitative single shot and spatially resolved plasma wakefield diagnostics
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DOI：
10.1103/physrevstab.18.081302
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发表时间：
2015-08
影响因子：
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通讯作者：
M. Kasim;J. Holloway;L. Ceurvorst;M. C. Levy;N. Ratan;J. Sadler;R. Bingham;P. Burrows;R. Trines;M. Wing;P. Norreys
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文献类型：
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作者：
M. Kasim;J. Holloway;L. Ceurvorst;M. C. Levy;N. Ratan;J. Sadler;R. Bingham;P. Burrows;R. Trines;M. Wing;P. Norreys
诊断等离子体条件对优化等离子体韦克菲尔德加速器实验具有重要意义。一种可能的方法是光子加速。通过将激光探测脉冲传播通过等离子体韦克菲尔德并提取施加的频率调制，可以获得韦克菲尔德的密度调制的图像。为了诊断等离子体中选定点处的韦克菲尔德参数，探测脉冲以相对于韦克菲尔德的斜角穿过等离子体。本文导出了斜交角下激光脉冲频率调制与等离子体韦克菲尔德密度分布之间的关系式。本文提出的多维粒子模拟结果证实了频率调制分布和密度调制分布的一致性在10%以内。本文讨论了测量精度的局限性。该技术为定量诊断等离子体柱内已知位置处的等离子体韦克菲尔德密度开辟了新的可能性。
Diagnosing plasma conditions can give great advantages in optimizing plasma wakefield accelerator experiments. One possible method is that of photon acceleration. By propagating a laser probe pulse through a plasma wakefield and extracting the imposed frequency modulation, one can obtain an image of the density modulation of the wakefield. In order to diagnose the wakefield parameters at a chosen point in the plasma, the probe pulse crosses the plasma at oblique angles relative to the wakefield. In this paper, mathematical expressions relating the frequency modulation of the laser pulse and the wakefield density profile of the plasma for oblique crossing angles are derived. Multidimensional particle-in-cell simulation results presented in this paper confirm that the frequency modulation profiles and the density modulation profiles agree to within 10%. Limitations to the accuracy of the measurement are discussed in this paper. This technique opens new possibilities to quantitatively diagnose the plasma wakefield density at known positions within the plasma column.