Progress on Petawatt level experiments at BELLA Center for electron acceleration

ORAL

Abstract

In 2014, electron beams with energy up to 4.3 GeV were obtained using 9 cm-long capillary discharge plasma waveguides and laser pulses with peak power 310 TW [1]. Although the laser power available was 1 PW, at that time it was not possible to increase the electron beam energy further since effective laser-guiding of the 60 micron focal spot at lower density was not possible. Usually the capillary radius would be reduced to increase the plasma channel depth and achieve matched guiding of the laser, but for PW laser pulses significant capillary damage would typically occur. The concept of inverse bremsstrahlung heating inside a capillary waveguide was proposed to address this problem [2]. Results will be shown on the optimization of heating and laser-guiding, which has allowed for guiding of laser pulses with PW peak power and 60 micron radius over tens of centimeters, and the generation of electron beams with increased energy.

[1] W. P. Leemans et al., Phys. Rev. Lett. 113, 245002 (2014). [2] N.A. Bobrova et al., Phys. Plasmas 20, 020703 (2013).


–

Presenters

  • Anthony J Gonsalves

    Lawrence Berkeley Natl Lab, Lawrence Berkeley National Laboratory, USA, LBNL

Authors

  • Anthony J Gonsalves

    Lawrence Berkeley Natl Lab, Lawrence Berkeley National Laboratory, USA, LBNL

  • Kei Nakamura

    Lawrence Berkeley Natl Lab, LBNL

  • Joost Daniels

    Lawrence Berkeley National Laboratory, USA, Eindhoven University of Technology, The Netherlands, Lawrence Berkeley Natl Lab

  • Christopher V Pieronek

    Lawrence Berkeley National Laboratory, USA, University of California-Berkeley, USA, Univ of California - Berkeley

  • Kelly Swanson

    Lawrence Berkeley Natl Lab

  • Sven Steinke

    Lawrence Berkeley Natl Lab

  • Carlo Benedetti

    Lawrence Berkeley Natl Lab, Lawrence Berkeley National Laboratory, USA

  • Carl B Schroeder

    Lawrence Berkeley Natl Lab, LBNL

  • Jianhui Bin

    Lawrence Berkeley National Laboratory, USA, Lawrence Berkeley Natl Lab

  • Eric Esarey

    Lawrence Berkeley Natl Lab, LBNL

  • Wim Pieter Leemans

    Lawrence Berkeley Natl Lab, Lawrence Berkeley National Laboratory, USA, Lawrence Berkeley Natl Lab, U.C. Berkeley, Lawrence Berkeley Natl Lab, Univ of California - Berkeley, LBNL, UC Berkeley