Erlangen 2018 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 10: Laser Plasmas I
P 10.6: Vortrag
Dienstag, 6. März 2018, 15:30–15:45, KI 1.174
Seeded Self-Modulationalong the Proton Bunch at AWAKE — •Fabian Batsch1,2,3, Karl Rieger2,3, Joshua Moody2, Edda Gschwendtner1, and Patric Muggli1,2 — 1CERN, Genva, Switzerland — 2Max-Planck-Institut für Physik, München, Deutschland — 3Technische Universität München
The AWAKE experiment uses the seeded self-modulation (SSM) to drive large amplitude wakefields in a plasma. The seed for the wakefields is a sharp ionizing front located near the middle of the proton bunch. It is created by an intense laser pulse ionizing Rubidium (Rb). For electron acceleration, the electron bunch must be injected into the accelerating and focusing phase of the wakefields, approximately 100 plasma periods behind the seed laser position. Here, we show that by using a replica of the intense laser pulse we can determine precisely the position (timing) of the proton micro-bunches with respect to the ionizing laser pulse. Since the relative phase of the wakefields is tied to the proton micro-bunches, this method can be used to determine experimentally the delay between the ionizing laser pulse and the proton bunch so that the electrons can be injected into the accelerating and focusing phase of the wakefields. The results presented also show that the timing of the micro-bunches is stable against variations of the proton input parameters. They show as well the difference between seeded and unseeded self- modulation.