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

6 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
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Physics and Astronomy

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