锥形等离子体通道中LWFA的自注入束参数对等离子体密度梯度和激光脉冲振幅的依赖关系
Dependence of self-injected bunch parameters on the plasma density gradient and laser pulse amplitude at LWFA in a conical plasma channel
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中文总结 AI 辅助
本文通过WarpX数值模拟，探究锥形等离子体通道中自注入束参数对激光振幅和等离子体密度梯度的依赖关系，获得特定条件下的自注入束参数，为LWFA的应用提供依据。
中文摘要 AI 辅助
激光尾场加速（Laser wakefield acceleration, LWFA）是一种利用激光脉冲在等离子体中激发尾场实现带电粒子高梯度加速的先进方法。该方法的显著特点是能够产生并加速具有独特参数（电荷、能量、发射度及几何尺寸）的所谓自注入束，无需外部注入器提供所需束流即可将其加速至更高能量。自注入束的产生源于等离子体电子被激发的尾场捕获（即自注入现象），对于诸多应用场景，自注入束可直接用于相关实验。本文采用WarpX代码开展数值模拟，研究锥形等离子体通道中自注入束参数对激光脉冲振幅和等离子体密度纵向梯度的依赖关系。在激光振幅$a_0=E_0(m_{e0}c\boldsymbol{\nu}/e)^{-1}=3.6$、锥形通道半径从$4.0\boldsymbol{\nu}/\boldsymbol{\nu}_{pe}$减小至$2.16\boldsymbol{\nu}/\boldsymbol{\nu}_{pe}$、等离子体密度从通道入口的$n_e=2.61\times10^{19}\text{ cm}^{-3}$线性增加至出口处$3n_e$的条件下，获得的自注入束参数为：电荷$32.1\boldsymbol{\text{μC}}/\text{m}$、平均纵向动量$111.9m_ec$、长度$5.10\boldsymbol{\text{μm}}$、面积$5.3\boldsymbol{\text{μm}}^2$、横向发射度$1.6\times10^{-2}\boldsymbol{\text{mm·mrad}}$。
英文摘要
Laser wakefield acceleration (LWFA) is an advanced method of high gradient acceleration of charged particles with wakefield excited in plasma by laser pulse. A distinctive feature of this method is the ability to create and accelerate so-called self-injected bunches with unique parameters - charge, energy, emittance, and geometric dimensions - without the need for an external injector of the required bunches for their subsequent acceleration to higher energies. Self-injected bunches emerge due to the plasma electrons trapping by the excited wakefield (self-injection phenomenon). For many applications, self-injected bunches can be used directly in relevant experiments. In this paper the dependence of the self-injected bunch parameters on the laser pulse amplitude and longitudinal gradient of plasma density in tapered plasma channel is investigated using numerical simulation with the WarpX code. At the laser amplitude $a_0=E_0(m_{e0}cω/e)^{-1}=3.6$ in a conical channel with the radius decreasing from $4.0\,c/ω_{pe}$ to $2.16\,c/ω_{pe}$ and with the plasma density increasing linearly from $n_e=2.61\cdot10^{19}$ cm$^{-3}$ at the channel entrance to $3n_e$ at the exit, a self-injected bunch is obtained with the charge $32.1\,μ$C/m, the mean longitudinal momentum $111.9\,m_ec$, the length $5.10\,μ$m, the area $5.3\,μ$m$^2$, the transverse emittance $1.6\cdot10^{-2}$ mm$\cdot$mrad.
发表机构
- National Science Center “Kharkiv Institute of Physics and Technology”（哈尔科夫物理与技术国家科学中心）
- Deutsches Elektronen-Synchrotron DESY（德国电子同步加速器）
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