Pulsed Neutron Source Studies of Graphite-enriched Uranium Systems PDF Download
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Author: Fred A. Kloverstrom
Publisher:
ISBN:
Category : Neutrons
Languages : en
Pages : 28
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Author: Fred A. Kloverstrom
Publisher:
ISBN:
Category : Neutrons
Languages : en
Pages : 28
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Author:
Publisher:
ISBN:
Category : Neutrons
Languages : en
Pages : 940
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Author:
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ISBN:
Category :
Languages : en
Pages : 7
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The Intense Pulsed Neutron Source (IPNS) at Argonne National Laboratory is a spallation neutron source dedicated to materials research. Its three cryogenic methane moderators provide twelve neutron beams to fourteen neutron scattering instruments and test facilities. The moderators at IPNS are of cryogenic methane (CH4); one of liquid methane at 100 K, and two of solid methane at 30 K. These moderators produce intense beams of both cold and thermal neutrons. The moderators are each of a different physical configuration in order to tailor their performance for the instruments and facilities that operate on the neutron beams. As part of the ongoing operation of IPNS, as well as new enhancements to the target, moderator, and reflector systems, we have performed experiments characterizing the energy and time distribution of neutrons in the various beams. These measurements provide absolutely normalized energy spectra using foil activation techniques joined with time-of-flight measurements, and energy-dependent time distributions using a time-focused crystal analyzer. The IPNS accelerator system delivers 14 [mu]A of 450 MeV protons, in 100 ns pulses at 30 Hz, to a target composed of water-cooled depleted uranium disks. The solid methane ''H'' moderator is 100 by 100 by 45 mm in size, centerline poisoned with 0.25 mg/mm2 gadolinium, and decoupled from the graphite reflector with 0.5 mm of cadmium. The liquid methane ''F'' moderator, which is viewed from both faces, is also 100 by 100 by 45 mm in size, gadolinium poisoned 16 mm below each of the two viewed surfaces, and decoupled from the graphite reflector with cadmium. The solid methane ''C'' moderator has a re-entrant ''grooved'' geometry. The moderator is 100 by 100 by 80 mm overall, with 40 mm deep 12 mm wide horizontal grooves in the viewed surface. These grooves cover 50% of the viewed surface area. The ''C'' moderator is unpoisoned, but is decoupled from the graphite reflector with 0.5 mm of cadmium.
Author:
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ISBN:
Category : Science
Languages : en
Pages : 124
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Author:
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ISBN:
Category : Graphite
Languages : en
Pages : 84
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Author: Lee E. Strawbridge
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ISBN:
Category :
Languages : en
Pages : 196
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ISBN:
Category : Nuclear energy
Languages : en
Pages : 1118
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Author:
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ISBN:
Category : Energy development
Languages : en
Pages : 84
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Author: Joseph M. Harrer
Publisher:
ISBN: 9780870790058
Category : Technology & Engineering
Languages : en
Pages : 1052
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Author: R. L. Scott
Publisher:
ISBN:
Category : Criticality (Nuclear engineering)
Languages : en
Pages : 184
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