4-8 August 2015
America/Detroit timezone

Particle Acceleration - Laser Wakefield Experiments at U. Michigan

7 Aug 2015, 16:48
18m
Koessler (Michigan League)

Koessler

Michigan League

Speaker

Alexander Thomas (university of michigan)

Description

Presented here is an overview of laser wakefield accelerator (LWFA) experiments at the University of Michigan using the HERCULES and Lambda-Cubed high power laser systems. In our experiments, up to GeV energy electrons are generated in a cm scale plasma based accelerator. We show how using multi-stage gas cells result in increased stability and reproducibility. Annular quasimonoenergetic electron beams with mean energy in the range 200 − 400 MeV and charge on the order of several pC were generated using laser wakefield acceleration in a two-stage gas cell. Generation of these annular beams is associated with transverse injection occurring on the density downramp between stages. This well-localized injection produces a bunch of electrons performing coherent betatron oscillations in the wakefield resulting in a significant increase in the X-ray yield. Such ultrafast X-rays may lead to tabletop synchrotron light sources. We also use a high repetition rate to investigate the coherent control of the plasma dynamics by feedback-optimized wavefront manipulation using a deformable mirror. The demonstration of coherent control for plasmas opens new possibilities for future laser-based accelerators and their applications.
Oral or Poster Presentation Poster

Primary author

Alexander Thomas (university of michigan)

Presentation Materials