Abstract
The z-pinch model is used to calculate finite Larmor radius effects of a plasma with a hot component plasma annulus. The equations are analyzed for layer modes and the finite Larmor radius stabilization condition is calculated. Stability requires k2 ρ2h Rβh/Δ≳1, where k is the wavenumber in the z direction, ρh the hot species Larmor radius, βh the hot particle beta, and Δ the thickness of the pressure profile. In addition a new instability is found, caused by the interaction of the precessional modes associated with inner and outer edges of the hot particle pressure profile.
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