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Open Access Publications from the University of California

Measurement of 14 MeV neutrons at TFTR with Si‐diode detectors

  • Author(s): Ruskov, E
  • Heidbrink, WW
  • Duong, HH
  • Roquemore, AL
  • Strachan, JD
  • et al.

Published Web Location Commons 'BY' version 4.0 license

A detector system based on partially depleted silicon surface barrier detectors and fast front-end electronics has been built and cross calibrated to a set of absolutely calibrated 4He recoil detectors. The cross-calibration factor for the channel with the widest dynamic range is 2.5×10-13 counts per 14 MeV source neutron. These data agree well with the independent neutron activation data. The new detector system covers a large dynamic range (corresponding to 1013-1018 neutrons/s). The response is linear, except at the highest count rates where the detector dead time (∼200 ns) causes departure from linearity. The noise discrimination against 2.5 MeV neutrons and γ pileup is excellent. Measurements of D-T neutrons from a tritium gas puff experiment as well as from a high-power D-T discharge in the TFTR tokamak are presented. © 1995 American Institute of Physics.

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