Formation of a non-monotonic energy distribution of energetic ions in NSTX

in NSTX Ya.I. Kolesnichenko , S.S. Medley, R.B. White, Yu.V. Yakovenko 1 Institute for Nuclear Research, Kyiv, Ukraine 2 Princeton Plasma Physics Laboratory, Princeton, USA Introduction. The energy distribution of fast ions, , is normally monotonically decreasing because of Coulomb collisions. However, experiments on the NSTX spherical torus have shown that a big bump on – so-called “high-energy feature” (HEF) – can arise at the