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arXiv 2209.04853physics.plasm-phphysics.acc-phphysics.optics
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在激光尾场加速器中使用密度下降注入控制电子束电流、电荷和能散

Control of electron beam current, charge and energy spread using density downramp injection in laser wakefield accelerators

Celine Hue, Yang Wan, Eitan Y. Levine, Victor Malka

AI总结:

本研究通过微调等离子体密度参数,利用密度下降注入在激光尾场加速器中实现了对电子束电流、电荷和能散的控制,获得了高电荷和低能散的电子束。

摘要:

密度下降注入已被证明是在激光尾场加速器中产生高质量电子束的一种优雅且高效的方法。然而,所产生的电子束的电荷量为每焦耳激光能量几十pC,这仍然限制了其在更广泛的应用中的使用。在保持良好束流质量的同时产生高电荷束的可能性仍有待探索。此外,尽管先前的研究集中在独立的物理过程上,例如影响加速场的均匀性从而影响被捕获电子的能散的束流负载效应,降低被捕获电子的横向动量$p_\perp$并导致小束流发射度的气泡后部尖刺的排斥力,以及激光在等离子体中传播时的演化。对等离子体密度参数对最终束流特性的影响需要更一般性的研究。在这项工作中,我们证明了注入电子束的电流分布与密度跃迁参数直接相关,这进一步影响了束流电荷和能散。通过微调等离子体密度参数,可以获得高电荷(高达几百pC)和低能散(约1% FWHM)的电子束。所有这些结果都得到了大规模三维粒子模拟的支持。

英文摘要:

Density dowmramp injection has been demonstrated to be an elegant and efficient approach for generating high quality electron beams in laser wakefield accelerators. Yet, the charge of the produced beam is tens of pC per Joule of laser energy, still limiting its use for a wider range of applications. The possibility of generating high charge beam while keeping a good beam quality, stays to be explored. Moreover, despite previous studies focused on separate physical processes such as beam loading which affects the uniformity of the acceleration field and thus the energy spread of the trapped electrons, repulsive force from the rear spike of the bubble which reduces the transverse momentum $p_\perp$ of the trapped electrons and results in small beam emmittance, and the laser evolution when travelling in plasma. A more general investigation of the plasma density parameters on the final beam properties is required. In this work, we demonstrate that the current profile of the injected electron beam is directly correlated with the density transition parameters, which further affects the beam charge and energy spread. By fine-tuning the plasma density parameters, high-charge (up to several hundreds of pC) and low-energy-spread (around 1\% FWHM) electron beams can be obtained. All these results are supported by large-scale three-dimensional particle-in-cell simulations.

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