Tokamak Fusion Test Reactor charge exchange atom spectrometry using a natural diamond detector
- 1 January 1999
- journal article
- research article
- Published by AIP Publishing in Review of Scientific Instruments
- Vol. 70 (1), 1107-1110
- https://doi.org/10.1063/1.1149500
Abstract
Natural diamond detectors (NDD) developed in Russia were used for fast charge exchange H 0 atom spectrometry and flux dynamic measurements during TokamakFusion Test Reactor (TFTR) H + minority ion cyclotron resonance heating (ICRH) experiments in deuterium plasma. For selected NDDs, the high energy resolution (∼2%–3%) and radiation resistance (5×10 14 n/cm 2 ) and low sensitivity to neutrons and gammas enable spectrometry of fast (0.2–3 MeV) atoms in TFTR radiation conditions. The NDD compact housing (∼2 cm+3) allowed noninterfering insertion into the particle charge exchange flight tube giving both systems similar views which allows comparison of their spectra and fluxes. A small NDD was chosen to limit count rates to 7×10 5 s −1 . A spectroscopy amplifier operating with pileup inspection at such rates was developed, enabling measurement of the dependence of fast perpendicular proton energy spectra on ICRH heating power during sawtooth-free and sawtooth-crash times. The results agree with a model developed for sawtooth redistribution of fast particles.Keywords
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