Energetic-Electron-Driven Instability in the Helically Symmetric Experiment
- 10 July 2009
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review Letters
- Vol. 103 (2), 025003
- https://doi.org/10.1103/physrevlett.103.025003
Abstract
Energetic electrons generated by electron cyclotron resonance heating are observed to drive instabilities in the quasihelically symmetric stellarator device. The coherent, global fluctuations peak in the plasma core and are measured in the frequency range of 20–120 kHz. Mode propagation is in the diamagnetic drift direction of the driving species. When quasihelical symmetry is broken, the mode is no longer observed. Experimental observations indicate that the unstable mode is acoustic rather than Alfvénic.This publication has 18 references indexed in Scilit:
- Alfvén eigenmode observations on DIII-D via two-colour CO2interferometryPlasma Physics and Controlled Fusion, 2005
- Monitoring Alfvén Cascades with Interferometry on the JET TokamakPhysical Review Letters, 2004
- Observation of Helicity-Induced Alfvén Eigenmodes in Large-Helical-Device Plasmas Heated by Neutral-Beam InjectionPhysical Review Letters, 2003
- New Interpretation of Alpha-Particle-Driven Instabilities in Deuterium-Tritium Experiments on the Tokamak Fusion Test ReactorPhysical Review Letters, 2003
- Observation of Compressional Alfvén Modes During Neutral-Beam Heating on the National Spherical Torus ExperimentPhysical Review Letters, 2001
- Energetic-Ion-Driven Toroidal Alfvén Eigenmodes Observed in a Heliotron/Torsatron PlasmaPhysical Review Letters, 1999
- A review of Alfvén eigenmode observations in toroidal plasmasPlasma Physics and Controlled Fusion, 1999
- Neutral beam driven global Alfvén eigenmodes in the Wendelstein W7-AS stellaratorPhysical Review Letters, 1994
- Excitation of the toroidicity-induced shear Alfvén eigenmode by fusion alpha particles in an ignited tokamakPhysics of Fluids B: Plasma Physics, 1989
- Quasi-helically symmetric toroidal stellaratorsPhysics Letters A, 1988