Off-axis sawteeth are often observed in reversed magnetic shear plasmas when the minimum safety factor q is near or below 2. Fluctuations with m/n0ex0ex=0ex0ex2/1 ( m and n are the poloidal and toroidal mode numbers) appear before and after the crashes. Detailed comparison has been made between the measured Tₑ profile evaluation during the crash and a nonlinear numerical magnetohydrodynamics simulation. The good agreement between observation and simulation indicates that the off-axis sawteeth are due to a double-tearing magnetic reconnection process.
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Chang et al. (1996) studied this question.
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