Multi-scattering time-of-flight neutron spectrometer for deuterium to tritium fuel ratio measurement in fusion experimental reactors

Asai, Keisuke; Yukawa, K.; Iguchi, Tetsuo; Naoi, N.; Watanabe, K.; Kawarabayashi, Jun; Yamauchi, M.; Konno, Chikara

doi:10.1016/j.fusengdes.2008.08.002

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2010

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“…[1][2][3][4][5][6] In plasmas of mixed deuterium and tritium fuel, the following neutron-producing reactions are possible ͑energies in MeV are given͒: D + D → 3 He͑0.820͒ + n͑2.449͒, ͑1͒ Previous work has shown that neutron emission spectroscopy ͑NES͒ is potentially capable of contributing to this measurement.…”

Section: Introductionmentioning

confidence: 99%

Neutron spectroscopy as a fuel ion ratio diagnostic: Lessons from JET and prospects for ITER

Ericsson

Conroy

Johnson

et al. 2010

Review of Scientific Instruments

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The determination of the fuel ion ratio n(t)/n(d) in ITER is required at a precision of 20%, time resolution of 100 ms, spatial resolution of a/10, and over a range of 0.016 keV and for n(T)/n(D)<0.6. A crucial issue is the signal-to-background situation in the measurement of the weak 2.5 MeV emission from DD reactions in the presence of a background of scattered 14 MeV DT neutrons. Important experimental input and corroboration for this assessment are presented from the time-of-flight neutron spectrometer at JET where the presence of a strong component of backscattered neutrons is observed. Neutron emission components on ITER due to beam-thermal and tritium-tritium reactions can further enhance the prospects for NES.

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