| Issue |
Europhys. Lett.
Volume 59, Number 6, September II 2002
|
|
|---|---|---|
| Page(s) | 841 - 847 | |
| Section | Physics of gases, plasmas, and electric discharges | |
| DOI | https://doi.org/10.1209/epl/i2002-00119-4 | |
| Published online | 01 September 2002 | |
Influence of broadened pump wave spectra on the stochastic heating in an ECR mirror machine
1
RRC “Kurchatov Institute" - Moscow, Russia
2
Experimentalphysik insbes. Gaselektronik, Ruhr-Universität Bochum
D-44780 Bochum, Germany
3
Laboratoire de Physique et Technologie de Plasma, UMR 7648 du CNRS
Ecole Polytechnique - F-91128 Palaiseau, France
Corresponding author: klaus.wiesemann@ruhr-uni-bochum.de
Received:
30
April
2002
Accepted:
3
July
2002
We observed the presence of both a symmetric spectral broadening of the pump wave and a noise with frequencies close to the growth rate of a parametric instability in a magnetic mirror trapped plasma heated by microwaves. The microwave frequency agreed on certain surfaces in the trap with the local electron cyclotron resonance (ECR) frequency. Parametric instabilities introduce a system of interacting oscillators, namely plasma waves, providing a mechanism of phase randomization, different from the phase randomization due to single-particle motion considered so far for ECR heating in quasilinear theory. Including the effect of the observed potential noise we obtain a modified model for ECR heating exhibiting a shorter randomization time.
PACS: 52.20.Dq – Particle orbits / 52.35.Mw – Nonlinear phenomena: waves, wave propagation, and other interactions (including parametric effects, mode coupling, ponderomotive effects, etc.) / 52.35.Ra – Plasma turbulence
© EDP Sciences, 2002
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