Proton beam self-modulation seeded by electron bunch in plasma with density ramp

Результат исследования: Научные публикации в периодических изданияхстатьярецензирование

Аннотация

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.

Язык оригиналаанглийский
Номер статьи115025
Число страниц10
ЖурналPlasma Physics and Controlled Fusion
Том62
Номер выпуска11
DOI
СостояниеОпубликовано - ноя 2020

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