高效等离子体加速器中横向不稳定性的研究
Investigation of transverse instability in efficient plasma-based accelerators
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中文总结 AI 辅助
研究等离子体加速器中横向不稳定性，提出基于等离子体尾波势的解析横向尾波模型，通过参数扫描确定运行窗口，经三维粒子模拟验证，该模型可规避效率 - 不稳定性障碍，为紧凑型高亮度粒子对撞机提供设计路径。
中文摘要 AI 辅助
在等离子体加速器中，同时实现功率传输效率最大化和保持束流质量受到横向束流破裂不稳定性的限制。我们提出了一种基于等离子体尾波势的解析横向尾波模型，该模型能自洽地捕捉强束流负载下变形的腔边界。此模型通过参数扫描绘制效率极限与稳定性阈值的关系，以确定一个运行窗口。三维粒子模拟验证了该理论模型，表明在1米传播距离上加速定制梯形电子束时，解析质心演化与数值跟踪相符。束流实现了高达16.5 GeV的能量增益，横向发射度几乎保持不变，尾波与尾随束流的功率传输效率接近80%，最终相对能量 spread 小于1.5%。这些结果表明，通过精确确定横向尾波力和定制束流负载，可以规避效率 - 不稳定性障碍，为紧凑型、高亮度粒子对撞机提供了一条设计路径。
英文摘要
Simultaneously maximizing power-transfer efficiency and preserving beam quality in plasma-based accelerators is constrained by the transverse beam breakup instability. We present an analytical transverse wake model derived from the plasma wake potential that self-consistently captures deformed cavity boundaries under intense beam loading. This model maps efficiency limits against stability thresholds across a parametric scan to isolate an operating window. Three-dimensional particle-in-cell simulations validate the theoretical model, showing that the analytical centroid evolution matches numerical tracking during the acceleration of a tailored trapezoidal electron bunch over a 1 m propagation distance. The bunch achieves an energy gain of up to 16.5 GeV with nearly preserved transverse emittance, and a wake-to-trailing bunch power-transfer efficiency of nearly 80%, with a final relative energy spread of less than 1.5%. These results show that the efficiency-instability barrier can be circumvented through precise determination of transverse wake force and tailored beam loading, providing a design path toward compact, high-luminosity particle colliders.
