Driven Resonance in Partially Relaxed Plasmas

Journal Article · Fri Apr 27 04:00:00 EDT 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.98.175001· OSTI ID:20951276

Tang, X Z ^[1]

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1. Theoretical Division, Los Alamos National Laboratory, Los Alamos, New Mexico 87545 (United States)

A Taylor-relaxed plasma (j=kB with k a constant) under external magnetic helicity injection encounters resonances in spatial frequencies of its force-free eigenmodes. Such driven resonance underlies the physics of magnetic self-organization and determines the flux amplification in laboratory helicity injection applications. Here we show that for partially relaxed plasmas where the deviation from the fully relaxed Taylor state, for example, a flux-dependent k, is a function of the normalized flux {chi}/{chi}{sub a} with {chi}{sub a} the poloidal flux at the magnetic axis, a modified driven resonance persists even if k({chi}) has an order-unity variation across the flux surfaces.

• OSTI ID: 20951276
• Journal Information: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 17 Vol. 98; ISSN 0031-9007; ISSN PRLTAO
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AMPLIFICATION
HELICITY
MAGNETIC SURFACES
PLASMA
RESONANCE