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Title: Modular Neutron Multiplicity Module


LANL’s neutron shift register coincidence and multiplicity firmware on a standard COTS data acquisition card

  1. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Publication Date:
Research Org.:
Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
Report Number(s):
DOE Contract Number:
Resource Type:
Technical Report
Country of Publication:
United States

Citation Formats

Newell, Matthew R. Modular Neutron Multiplicity Module. United States: N. p., 2017. Web. doi:10.2172/1357151.
Newell, Matthew R. Modular Neutron Multiplicity Module. United States. doi:10.2172/1357151.
Newell, Matthew R. 2017. "Modular Neutron Multiplicity Module". United States. doi:10.2172/1357151.
title = {Modular Neutron Multiplicity Module},
author = {Newell, Matthew R.},
abstractNote = {LANL’s neutron shift register coincidence and multiplicity firmware on a standard COTS data acquisition card},
doi = {10.2172/1357151},
journal = {},
number = ,
volume = ,
place = {United States},
year = 2017,
month = 5

Technical Report:

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  • The propulsion module comprises six to eight 30-cm thruster and power processing units, a mercury propellant storage and distribution system, a solar array ranging in power from 18 to 25 kW, and the thermal and structure systems required to support the thrust and power subsystems. Launch and on-orbit configurations are presented for both modular approaches. The propulsion module satisfies the thermal design requirements of a multimission set including: Mercury, Saturn, and Jupiter orbiters, a 1-AU solar observatory, and comet and asteroid rendezvous. A detailed mass breakdown and a mass equation relating the total mass to the number of thrusters andmore » solar array power requirement is given for both approaches.« less
  • MiniGRAND on a standard COTS data acquisition card.
  • Recent development in the theory and practice of neutron correlation (''coincidence'') counting require knowledge of the higher factorial moments of the P/sub distribution (the probability that ( neutrons are emitted in a fission) for the case where the fission is induced by bombarding neutrons of more than thermal energies. In contrast to the situation with spontaneous and thermal neutron induced fission, where with a few exceptions the P/sub is reasonably well known, in the fast neutron energy region, almost no information is available concerning the multiplicity beyond the average value, (, even for the most important nuclides. Themore » reason for this is the difficulty of such experiments, with consequent statistically poor and physically inconsistent results.« less
  • During an advanced IAEA inspector training course given at Los Alamos in November, 1997, the opportunity existed for an intercomparison study of various neutron detectors to quantify measurement performance using pure and impure plutonium oxide and mixed uranium-plutonium oxide (MOX) items. Because of the cost of counters designed specifically for multiplicity analysis, it was desired to explore the limits of other, less costly and less efficient detectors. This paper presents and intercompares neutron coincidence and multiplicity assay performance for five detectors, which vary widely in detection efficiency. Eight pure plutonium oxide and twelve impure plutonium oxide and MOX working standardsmore » were used in the study.« less