论文标题
质子束自调调，由电子束在血浆中的密度坡道中种子
Proton beam self-modulation seeded by electron bunch in plasma with density ramp
论文作者
论文摘要
等离子体中的种子自调节可以将长质子束转换为一系列微型烧造的火车，可以在长距离上激发强大的尾矿，但是这需要等离子体具有一定的密度曲线，并在短尺度上向上延伸。对于CERN的醒目实验的参数，如果自我调制是由短电子束播种的，我们可以数值研究哪些密度曲线是最佳的。借助最佳剖面，可以在波浪级的一半处“冻结”韦克菲尔德。高能电子束（160 MEV）的效率低于低能的种子（18 MeV），因为前者的韦克菲尔德持续时间比有效播种所需的持续时间更长。
Seeded self-modulation in a plasma can transform a long proton beam into a train of micro-bunches that can excite a strong wakefield over long distances, but this needs the plasma to have a certain density profile with a short-scale ramp up. For the parameters of the AWAKE experiment at CERN, we numerically study which density profiles are optimal if the self-modulation is seeded by a short electron bunch. With the optimal profiles, it is possible to "freeze" the wakefield at approximately half the wavebreaking level. High-energy electron bunches (160 MeV) are less efficient seeds than low-energy ones (18 MeV), because the wakefield of the former lasts longer than necessary for efficient seeding.
