(TH/P1-06) Integral Equation Based Stability Analysis of Short Wavelength Drift Modes in Tokamaks

**Abstract.** A new short wavelength drift mode in tokamaks has been
identified in stability analysis based on fully kinetic, electromagnetic
integral equation code. The wavelength regime is in the electron skin depth
and the instability is driven by toroidicity, electron temperature gradient,
and magnetic shear. Ion temperature gradient has stabilizing influence. Both
ions and electrons participate in the instability in nonadiabatic manner and
the growth rate exhibits strong isotope effect being inversely proportional
to the ion mass. The instability is stabilized in negative shear regime. It
does not require trapped electrons and is resilient against finite beta
stabilization.

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*IAEA 2003*