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Title: Optimization of the SNS neutron beam current

Abstract

The proposed Spallation Neutron Source (SNS) facility will consist of two parts: (a) a high-energy (1-GeV) and high-powered (1-MW) proton accelerator (linac) and accumulator ring and (b) a target station that converts the protons to low-energy (<2 eV) neutrons and delivers them to the neutron-scattering instruments. It will be a 60-Hz facility delivering 6 {times} 10{sup 15} protons each second in 60-{micro}s pulses with a linac length of 490 m and an accumulator ring circumference of 220 m. Work is now under way to optimize the neutron beam current. Both the intensity and the time pulse characteristics are important with different requirements for different instruments. The effect of varying the reflector material, the moderator poison location, and the moderator dimensions has been considered. In addition, the impact on the current when a premoderator or a composite moderator is used has been assessed. Two reflector materials were picked to be studied in detail: beryllium and lead. A beryllium reflector gave a greater thermal neutron current but a wider pulse width, with the peak currents about the same. A simple figure of merit (FOM) (intensity/pulse width squared) favored the lead reflector.

Authors:
 [1]
  1. Oak Ridge National Lab., TN (United States)
Publication Date:
OSTI Identifier:
298354
Report Number(s):
CONF-981106-
Journal ID: TANSAO; ISSN 0003-018X; TRN: 99:001985
Resource Type:
Journal Article
Resource Relation:
Journal Name: Transactions of the American Nuclear Society; Journal Volume: 79; Conference: American Nuclear Society winter meeting, Washington, DC (United States), 15-19 Nov 1998; Other Information: PBD: 1998
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 07 ISOTOPE AND RADIATION SOURCE TECHNOLOGY; ACCELERATOR FACILITIES; NEUTRON SOURCES; NEUTRON BEAMS; BEAM CURRENTS; OPTIMIZATION; MODERATORS; MEASURING INSTRUMENTS; NEUTRON REFLECTORS; NEUTRON SPECTRA

Citation Formats

Charlton, L.A. Optimization of the SNS neutron beam current. United States: N. p., 1998. Web.
Charlton, L.A. Optimization of the SNS neutron beam current. United States.
Charlton, L.A. Thu . "Optimization of the SNS neutron beam current". United States. doi:.
@article{osti_298354,
title = {Optimization of the SNS neutron beam current},
author = {Charlton, L.A.},
abstractNote = {The proposed Spallation Neutron Source (SNS) facility will consist of two parts: (a) a high-energy (1-GeV) and high-powered (1-MW) proton accelerator (linac) and accumulator ring and (b) a target station that converts the protons to low-energy (<2 eV) neutrons and delivers them to the neutron-scattering instruments. It will be a 60-Hz facility delivering 6 {times} 10{sup 15} protons each second in 60-{micro}s pulses with a linac length of 490 m and an accumulator ring circumference of 220 m. Work is now under way to optimize the neutron beam current. Both the intensity and the time pulse characteristics are important with different requirements for different instruments. The effect of varying the reflector material, the moderator poison location, and the moderator dimensions has been considered. In addition, the impact on the current when a premoderator or a composite moderator is used has been assessed. Two reflector materials were picked to be studied in detail: beryllium and lead. A beryllium reflector gave a greater thermal neutron current but a wider pulse width, with the peak currents about the same. A simple figure of merit (FOM) (intensity/pulse width squared) favored the lead reflector.},
doi = {},
journal = {Transactions of the American Nuclear Society},
number = ,
volume = 79,
place = {United States},
year = {Thu Dec 31 00:00:00 EST 1998},
month = {Thu Dec 31 00:00:00 EST 1998}
}