Ultrahigh-sensitivity threshold neutron detector for plasma diagnostics

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An ultrahigh-sensitivity fast fission counter was developed to selectively detect high-energy neutrons (E/sub n/>1 MeV) produced by D-D and D-T fusion reactions in thermonuclear plasmas. Discrimination against slow and epithermal neutrons produced by scattering or electrodissociation of deuterium was achieved by sensitizing the detector with 100 g of highly depleted /sup 238/UO/sub 2/, which has a fission threshold for neutron energies E/sun n/>1 MeV. The capacitive signal loading effects of the detector's large electrode area (5 m/sup 2/) were mitigated by using a transmission-line electrode configuration. Wideband, low-noise preamplifiers were developed to match the 25-..cap omega.. characteristic impedance of the ... continued below

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Pages: 6

Creation Information

Valentine, K.H.; Kopp, M.K.; Allin, G.W.; Clay, W.T. & Miller, V.C. January 1, 1984.

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Description

An ultrahigh-sensitivity fast fission counter was developed to selectively detect high-energy neutrons (E/sub n/>1 MeV) produced by D-D and D-T fusion reactions in thermonuclear plasmas. Discrimination against slow and epithermal neutrons produced by scattering or electrodissociation of deuterium was achieved by sensitizing the detector with 100 g of highly depleted /sup 238/UO/sub 2/, which has a fission threshold for neutron energies E/sun n/>1 MeV. The capacitive signal loading effects of the detector's large electrode area (5 m/sup 2/) were mitigated by using a transmission-line electrode configuration. Wideband, low-noise preamplifiers were developed to match the 25-..cap omega.. characteristic impedance of the transmission line. The neutron sensitivity of the detector was shown to be 0.07 counts.s/sup -1/.(neutron/(cm/sup 2/.s))/sup -1/ for E/sub n/>2 MeV in initial laboratory testing.

Physical Description

Pages: 6

Notes

NTIS, PC A02/MF A01.

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  • Nuclear science symposium, Orlando, FL, USA, 31 Oct 1984

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  • Other: DE85005270
  • Report No.: CONF-841007-52
  • Grant Number: AC05-84OR21400
  • Office of Scientific & Technical Information Report Number: 6145259
  • Archival Resource Key: ark:/67531/metadc1110734

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Office of Scientific & Technical Information Technical Reports

Reports, articles and other documents harvested from the Office of Scientific and Technical Information.

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  • January 1, 1984

Added to The UNT Digital Library

  • Feb. 22, 2018, 7:45 p.m.

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  • May 23, 2018, 1:30 p.m.

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Valentine, K.H.; Kopp, M.K.; Allin, G.W.; Clay, W.T. & Miller, V.C. Ultrahigh-sensitivity threshold neutron detector for plasma diagnostics, article, January 1, 1984; Tennessee. (digital.library.unt.edu/ark:/67531/metadc1110734/: accessed September 25, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.