Analysis and simulation of a small-angle neutron scattering instrument on a 1 MW long pulse spallation source

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We studied the design and performance of a small-angle neutron scattering (SANS) instrument for a proposed 1 MW, 60 Hz long pulsed spallation source at the Los Alamos Neutron Science Center (LANSCE). An analysis of the effects of source characteristics and chopper performance combined with instrument simulations using the LANSCE Monte Carlo instrument simulations package shows that the T{sub 0} chopper should be no more than 5 m from the source with the frame overlap and frame definition choppers at 5.6 and greater than 7 m, respectively. The study showed that an optimal pulse structure has an exponential decaying tail ... continued below

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24 p.

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Olah, G.A.; Hjelm, R.P. & Lujan, M. Jr. December 31, 1996.

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Description

We studied the design and performance of a small-angle neutron scattering (SANS) instrument for a proposed 1 MW, 60 Hz long pulsed spallation source at the Los Alamos Neutron Science Center (LANSCE). An analysis of the effects of source characteristics and chopper performance combined with instrument simulations using the LANSCE Monte Carlo instrument simulations package shows that the T{sub 0} chopper should be no more than 5 m from the source with the frame overlap and frame definition choppers at 5.6 and greater than 7 m, respectively. The study showed that an optimal pulse structure has an exponential decaying tail with {tau} {approx} 750 {mu}s. The Monte Carlo simulations were used to optimize the LPSS SANS, showing that an optimal length is 18 m. The simulations show that an instrument with variable length is best to match the needs of a given measurement. The performance of the optimized LPSS instrument was found to be comparable with present world standard instruments.

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24 p.

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INIS; OSTI as DE97004703

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  • 5. world conference on neutron radiography, Berlin (Germany), 17-20 Jun 1996

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  • Other: DE97004703
  • Report No.: LA-UR--97-548
  • Report No.: CONF-9606223--6
  • Grant Number: W-7405-ENG-36
  • Office of Scientific & Technical Information Report Number: 464176
  • Archival Resource Key: ark:/67531/metadc677678

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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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  • December 31, 1996

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  • July 25, 2015, 2:21 a.m.

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  • May 20, 2016, 1:01 p.m.

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Olah, G.A.; Hjelm, R.P. & Lujan, M. Jr. Analysis and simulation of a small-angle neutron scattering instrument on a 1 MW long pulse spallation source, article, December 31, 1996; New Mexico. (digital.library.unt.edu/ark:/67531/metadc677678/: accessed December 15, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.