Novel directional ion energy analyzer

Abstract

A new ion energy analyzer with high angular resolution (⩽3×10−4 sr) is described. It consists of a microchannel plate followed by a retarding-grid type analyzer. The microchannel plate is not used for charge multiplication but as a geometric filter with narrow angular passband (ϑ≃0.6°) yet high transparency (T≃60%). The energy analyzer is used to measure the true velocity space distribution of low-energy ion beams (Eb = 10–100 eV) in a double plasma device. Its superior performance over the conventional gridded energy analyzer is demonstrated. Applications to the study of beam wakes are shown.

Numerical simulations of the charging of dust particles by contact with hot plasmas

“…In a way, these results agree with those obtained for the micro-porous ion energy analyzers used in some double plasma devices. Also in these cases only those ions having a velocity vector exactly aligned with the pores of the analyzer reach the collector (Stenzel et al, 1982). We also note the large potential variations originating from the differences in charge density on the two sides of extrusions facing towards and away the plasma flow, respectively.…”

Mass and energy selected ion beam for deposition and ion induced surface modifications

“…It results in an erroneous, broaden IEDF. Stenzel et al 22 proposed an energy analyzer with high angular resolution where the ions are filtered with a microchannel plate. A layout of such an energy analyzer, specially designed and implemented Fig.…”

High Power Ion Cyclotron Heating in the VASIMR Engine

“…The observed energy boost was 17 eV, more than double the energy with the helicon alone, as shown in Figures 8 and 9. Two-dimensional contour plots of the ion velocity phase space distribution functions that were obtained by rotating the RPA, shot-to-shot 58,59 , are shown in Figure 9. Evidence of pitch angle scattering by neutrals may be seen in both panels of Figure 9.…”

“…Nonetheless, the effect of significant particle heating is apparent. Full ion velocity phase space distribution functions can be obtained by rotating the RPA, shot-to-shot 58,59 . Two dimensional color contour plots of a planar cut through the distribution function are shown in Figure 13 for ICRHoff and Figure 14 for 14 kW of ICRH-on.…”