Abstract

Neutron spectrometer/counter systems have been developed for diagnostic measurements on magnetically confined deuterium and deuterium-tritium plasmas. An early version was used to determine the mean ion energy as well as the ion-energy confinement time in the endplugs of the Tandem Mirror Experiment. A recent upgrade includes a 10 MHz pulse height analysis and particle identification capability for time- and space-resolved neutron spectrum measurements. Resolution is adequate for a neutron Doppler-width measurement of mean ion energy in near-future confinement experiments such as the Mirror Fusion Test Facility.

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