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

概要

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Stochastic acceleration of electrons trapped in an inhomegeneous magnetic field is observed. Aright-hand circular polarized microwave is ttsed to excite an electron cyclotron wave, and a plasmawith a temperature< 6 eV and a density< T X 10" cm ' is produced. The electrons trappedin the weak mirror interact with the electron cyclotron wave in their bouncing motion, and areaccelerated to a few tens of keV range, emitting soft X-rays by bremsstrahlung. A simple discretelIl2lLP based on the bounce period is derived to analyze the wave-particle systern, and is fottndto be reduced to the Fermi map. The experimental results are understood with a knowledgeof numerical experiments on this map, and the upper limit of acceleration is determined bythe upper boundary of the stochastic region in the phase space. The theoretucal scaling ofthe maximurn electron energy with respect to wave power shows a good agreement with theexperimental results.
社団法人日本物理学会の論文
1996-09-15