On the excitation of a trapped electron short-wavelength mode by fast ions

A study of electron collisions in the problem of the excitation of the trapped electron short-wave mode with fast ions has been made. As distinct from the other authors showing that at standard tokamak parameters fast ions are likely to lead to the build-up on the trapped particle modes, in the paper the effect of electron collisions has been taken into account and it is demonstrated that the short-wave mode damping decrement governed by electron collisions is great and instabilities in real conditions are impracticable