论文标题
等离子体 - 沃克菲尔德加速器中能量转移效率的纵向测量
Longitudinally resolved measurement of energy-transfer efficiency in a plasma-wakefield accelerator
论文作者
论文摘要
能源转移效率是等离子体 - 沃基菲尔德加速度的重要数量，尤其是对于需要高平均功率的应用。通常，使用电子光谱仪测量效率。一种具有侵入性的方法，可在等离子体加速器的全长上平均提供能量转移效率。在这里，我们通过实验证明了一种新的诊断，该诊断是利用梁血浆相互作用后血浆发出的多余光，从尾流到加速束的局部能量转移效率的无创，纵向分辨的测量。在这里，高达（58 $ \ pm $ 3）％。该方法适合在未来的多阶段等离子体加速器中在线优化单个阶段，并在加速过程中对效率与横向不稳定性之间的关系进行实验研究。
Energy-transfer efficiency is an important quantity in plasma-wakefield acceleration, especially for applications that demand high average power. Conventionally, the efficiency is measured using an electron spectrometer; an invasive method that provides an energy-transfer efficiency averaged over the full length of the plasma accelerator. Here, we experimentally demonstrate a novel diagnostic utilizing the excess light emitted by the plasma after a beam-plasma interaction, which yields noninvasive, longitudinally resolved measurements of the local energy-transfer efficiency from the wake to the accelerated bunch; here, as high as (58 $\pm$ 3)%. This method is suitable for online optimization of individual stages in a future multistage plasma accelerator, and enables experimental studies of the relation between efficiency and transverse instability in the acceleration process.
