Ion Bernstein mode instability with ring velocity distribution function

Experimental observation of ion heating by mode- converted ion Bernstein waves in tokamak plasmas

We report the experimental observation of ion heating by the mode-converted ion Bernstein waves (MC IBWs) in tokamak plasmas. The MC IBW is created from the fast waves launched from the high-field-side antenna in the HT-7 tokamak in plasmas consisting of deuterium majority, hydrogen minority and 7Li ions. Experimental evidence and numerical simulation show that the interaction between the MC IB...

Study of Fast Ion Instability at Kekb Electron Ring

We have studied fast ion instability (FII) in the electron ring (HER) at KEKB. We introduce an application of Singular Value Decomposition (SVD) to study multi-bunch beam oscillations. The SVD analysis[1] has been performed for a matrix consists of vertical bunch positions in a turn-byturn and bunch-by-bunch to extract wave lengths which characterized the behavior of multi-bunch beam instabilit...

Kinetic instability of ion acoustic mode in permeating plasmas

In plasmas with electron drift (current) relative to static ions, the ion acoustic wave is subject to the kinetic instability which takes place if the directed electron speed exceeds the ion acoustic speed. The instability threshold becomes different in the case of one quasi-neutral electron-ion plasma propagating through another static quasineutral (target) plasma. The threshold velocity of th...

Ion-Optical Studies for an ESR In-Ring Spectrometer Mode

Complementary to classical single-pass arrangements the use of storage rings for nuclear reaction studies offers some decisive advantages [1]. The circulating ions repeatedly interact with the target atoms at a high frequency (1-3 MHz) and thus provide a reasonable luminosity even at small numbers of projectile ions and/or low target densities. The stored ion beam is electron cooled, possesses ...

The ion velocity distribution function in a current-free double layer