Abstract
A ten-channel analyzer with a wide energy range and mass separation of ions designed for the diagnostics of hot plasma in large thermonuclear machines with injection of fast-atom beams is described. The dynamic range of the device, i.e. the energy ratio of the particles registered simultaneously in the two extreme channels, is equal to 30. The maximum energy of registered particles is 80 keV, the minimum, about 200 eV. The energy widths of channels are 6–30%. The detectors are made on a basis of channeltrons with ion-electron converters. The efficiency for the detection of ions is ⪆ 90%. The analyzer has been calibrated with beams of hydrogen and deuterium atoms. The stripping of atoms is achieved using the stationary admission of nitrogen and/or the pulsed admission of helium into the stripping chamber. The efficiency for the detection of atoms with the analyzer is in the range 10 −4 (at 300 eV) to 2 × 10 −1 (at 50 keV). The analyzer has been applied successfully in Tokamak-10 (USSR), and installed in ASDEX (BRD), Wendelstein-7 A (BRD), Heliotron-E (Japan).
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