Abstract
The nonlinear saturated state of the m=1, n=1 ideal MHD instability is calculated for a large-aspect-ratio tokamak. When the q(r) profile is nonmonotonic with q=qmin-1>0, the amplitude of the nonlinear state is given by 2qq=7.9[(qcq)32-1], where qc is the critical value of q at which the system is marginally stable. This nonlinear state is similar to that seen during the sawtooth crash in large tokamaks and may be related to the steady-state oscillations seen when sawteeth are suppressed by lower-hybrid current drive.
Original language | English (US) |
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Pages (from-to) | 2647-2649 |
Number of pages | 3 |
Journal | Physical review letters |
Volume | 59 |
Issue number | 23 |
DOIs | |
State | Published - 1987 |
All Science Journal Classification (ASJC) codes
- General Physics and Astronomy