A calibrated neutral atom spectrometer for measuring plasma ion temperatures in the 0.165- to 10-keV energy region

Abstract

A neutral spectrometer, consisting of a gas conversion cell and electrostatic energy analyser, has been designed, constructed, and calibrated to measure the energy dispersion of energetic H- or D-atoms escaping a plasma. For energies less than 300 to 500 eV the D-atom conversion to D+ was greater than that of H-atom conversion to H+. At a target density of 0.0125 Torr-cm the conversion efficiency of H in N2 gas is 3.8 × 10−4 at 0.165 keV and increases to 3.3 × 10−2 at 10 keV. Results for H2 conversion gas were an order of magnitute less than that of N2 at the lower energies.

Measurement of ion temperature and density profiles with a time-of-flight type neutral-particle analyzer

“…The coefficient of the secondary electron emission has the energy dependence. 6 There are several reports on the coefficient. The error was said to be due mostly to the technique of measuring rather than to the emitter material used.…”

Plasma diagnostic techniques using particle beam probes

“…6 The principles of this technique will be briefly reviewed to demonstrate the advantage of using an active version of this technique in both "small"and "large" devices.…”

“…Proton Scattering-----This interaction is described by ( 6) tn this case the beam particle remains neutral, but has its momentum scattered sufficiently that it is lost from ·the original beam. Again we expect vb >> v 1 , implying that creff ~as, the momentum scattering cross-section.…”

Multi-channel neutral analyzer-system

“…. [1][2][3][4][5][6][7][8][9] is the analysis of the energetic neutral particles escaping the plasma.…”