Speaker
Mr
Fabian Batsch
(CERN)
Description
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 electron 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.
Primary author
Mr
Fabian Batsch
(CERN)
Co-authors
Ms
Anna-Maria Bachmann
(CERN)
Dr
Edda Gschwendtner
(CERN)
Mr
Falk Braunmueller
(Max-Planck Institute for Physics)
Florence Friebels
Dr
Joshua Moody
(Max Planck Institute for Physics)
Mr
Karl Rieger
(Max Planck Institute for Physics Munich)
Mathias Hüther
Dr
Mikhail Martyanov
(Max Planck Institut fur Physik, Munich)
Prof.
Patric Muggli
(Max-Planck-Institut für Physik)
Spencer Gessner
(CERN)
Dr
Valentin Fedosseev
(CERN)
