Update on the Experimental Study of Current Filamentation Instability

POSTER

Abstract

Current Filamentation Instability (CFI) is of central importance for propagation of relativistic electron beams in plasmas. CFI has potential relevance to astrophysics, magnetic field/radiation generation in afterglow of gamma ray bursts, and inertial confinement fusion, energy transport in fast-igniter concept. An experiment is underway at Accelerator Test Facility at BNL with 60MeV electron beam and capillary discharge plasma. The goal is to conduct a systematic study and characterize CFI as function of beam (charge, transverse and longitudinal profile) and plasma (plasma density) parameters. The transverse beam profile is measured directly at the plasma exit with OTR from a gold-coated silicon window. Initial experimental results show reduction of the beam transverse size with the appearance of multiple beam filaments and the size and number of individual filaments depend on the plasma density. We will present early experimental results and outline next steps.

Authors

  • Brian Allen

    University of Southern California, USC

  • Patric Muggli

    University of Southern California

  • Joana L. Martins

    Instituto Superior T\'ecnico, GoLP/IPFN, Instituto Superior Tecnico, Lisboa, Portugal, GoLP/Instituto de Plasmas e Fus\~ao Nuclear, Instituto Superior T\'ecnico, Lisboa, GoLP/Instituto de Plasmas e Fusao Nuclear - Laboratorio Associado, Instituto Superior Tecnico, Lisbon, Portugal

  • Luis Silva

    Instituto Superior Tecnico, Lisboa Portugal, Instituto Superior T\'ecnico, GoLP/IPFN - LA - Instituto Superior Tecnico, GoLP/IPFN, Instituto Superior Tecnico, Lisboa, Portugal, Instituto Superior Tecnico, GoLP/IPFN - LA Instituto Superior Tecnico, GoLP/Instituto de Plasmas e Fusao Nuclear - Laboratorio Associado, Instituto Superior Tecnico, Lisbon, Portugal, GoLP/Instituto de Plasmas e Fus\~ao Nuclear - Laborat\'orio Associado, Instituto Superior T\'ecnico, Lisboa, Portugal, GoLP/IPFN, Instituto Superior T\'ecnico, Lisboa, Portugal, GoLP/Instituto de Plasmas e Fus\~ao Nuclear, Instituto Superior T\'ecnico, Lisboa, Insituto Superior Tecnico, Lisboa Portugal

  • Vitaly Yakimenko

    Brookhaven National Laboratory

  • Mikhail Fedurin

    Brookhaven National Laboratory

  • Karl Kusche

    Brookhaven National Laboratory

  • Marcus Babzien

    Brookhaven National Laboratory

  • Chengkun Huang

    Los Alamos National Laboratory

  • Warren Mori

    University of California at Los Angeles Los Angeles, UCLA, University of California Los Angeles, University of California, Los Angeles