Erlangen 2018 – wissenschaftliches Programm
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P: Fachverband Plasmaphysik
P 10: Laser Plasmas I
P 10.7: Vortrag
Dienstag, 6. März 2018, 15:45–16:00, KI 1.174
Laser-based Diagnostics of Plasma Wakefields in AWAKE — •Anna-Maria Bachmann1, Patric Muggli2, and Valentin Fedosseev1 — 1CERN, Geneva, Switzerland — 2Max-Planck Institute for Physics, Munich, Germany
The Advanced Wakefield Experiment AWAKE aims on developing a new plasma wakefield accelerator using a high energy proton beam as a driver. The 400 GeV proton bunch from CERN SPS propagates through a 10 m long rubidium plasma, created by an ionizing 4 TW laser pulse. The relativistic ionization front seeds the self-modulation process. The seeded self-modulation (SSM) transforms the bunch in a train of bunchlets driving wakefields in the plasma. Electrons will be injected and accelerated in the wakefields. AWAKE relies on the micro bunching of the long proton bunch. The modulation of the proton bunch also corresponds to a modulation of the electron plasma density. So far, there are no plasma diagnostics installed in AWAKE. We therefore investigate the possibility of measuring spectral modulation of a CW laser beam propagating perpendicularly to the wakefields to determine some of the wakefields characteristics. Wakefields period information will appear in the position of satellites in the spectrum of transmitted laser light, whereas wakefields amplitude information will be in the satellites intensity.