Stochastic Electron Acceleration by an Electron Cyclotron Wave Propagating in an Inhomogeneous Magnetic Field

Hiroaki Shoyama, Masayoshi Tanaka, Seiichiro Higashi, Yoshinobu Kawai, Mitsuo Kono

    Research output: Contribution to journalArticlepeer-review

    4 Citations (Scopus)

    Abstract

    Stochastic acceleration of electrons trapped in an inhomegeneous magnetic field is observed. A right-hand circular polarized microwave is used to excite an electron cyclotron wave, and a plasma with a temperature ≤ 6 eV and a density ≤ 7 × 1011 cm-3 is produced. The electrons trapped in the weak mirror interact with the electron cyclotron wave in their bouncing motion, and are accelerated to a few tens of keV range, emitting soft X-rays by bremsstrahlung. A simple discrete map based on the bounce period is derived to analyze the wave-particle system, and is found to be reduced to the Fermi map. The experimental results are understood with a knowledge of numerical experiments on this map, and the upper limit of acceleration is determined by the upper boundary of the stochastic region in the phase space. The theoretical scaling of the maximum electron energy with respect to wave power shows a good agreement with the experimental results.

    Original languageEnglish
    Pages (from-to)2860-2866
    Number of pages7
    Journaljournal of the physical society of japan
    Volume65
    Issue number9
    DOIs
    Publication statusPublished - 1996

    All Science Journal Classification (ASJC) codes

    • Physics and Astronomy(all)

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