Impact of multiple-frequency heating on the formation and control of diamagnetic electron rings in an axisymmetric mirror
Creators
- 1. TRW Electronics and Defense, Energy Research Center, One Space Park, Redondo Beach, California 90278
Description
High-beta, hot-electron plasmas have been produced by electron-cyclotron heating in the SM-1 axisymmetric mirror using closely-spaced multiple frequencies. The relativistic electrons produce annular distributions (ELMO rings) with as much as ten times more stored energy than with single-frequency heating. While larger frequency separations (Δf/fapprox.0.1) provide some control of the ring size, the dominant effects are associated with an improvement in heating efficiency which persists to very small frequency separations (Δf/fapprox.10-3). Details of the reconstruction of the ring distribution (both in steady state and during build-up), the influence of multiple frequency heating on fluctuations, axial electron losses, and a scaling of these effects with power are presented
Additional details
Publishing Information
- Journal Title
- Phys. Fluids
- Journal Volume
- 28
- Journal Issue
- 5
- Series
- Phys. Fluids.
- Journal Page Range
- 1503-1515
- ISSN
- 0031-9171
INIS
- Country of Publication
- United States
- Country of Input or Organization
- United States
- INIS RN
- 16072989
- Subject category
- S70: PLASMA PHYSICS AND FUSION TECHNOLOGY;
- Descriptors DEI
- DISTRIBUTION; ECR HEATING; ELECTRON RINGS; HIGH-BETA PLASMA; HOT PLASMA; MAGNETIC MIRRORS; PLASMA HEATING; RELATIVISTIC PLASMA; STEADY-STATE CONDITIONS; SYMMETRY
- Descriptors DEC
- HEATING; HIGH-FREQUENCY HEATING; OPEN PLASMA DEVICES; PLASMA; THERMONUCLEAR DEVICES