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Title: Towards Understanding the Cesium Cycle of the Persistent H{sup -} Beams at SNS

Abstract

This paper describes the accomplishments of the SNS H{sup -} ion source, which delivers routinely {approx}50 mA at a 5.4% duty factor with {approx}99% availability, enabling 1 MW beams for neutron production with {approx}90% availability. It discusses the need for increasing reliability and beam current. But mostly it focuses on its unexpected feature: H{sup -} beams that are apparently persistent for up to 5 weeks without adding Cs after an initial dose of less than {approx}5 mg. Thermal emission and sputtering are qualitatively evaluated, and appear consistent with a negligible Cs sputter rate after the initial dose disappears from the Cs plasma. It concludes with a list of future experiments that can shed more light on this apparently unique Cs cycle.

Authors:
; ; ; ; ;  [1]
  1. Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, TN 37831 (United States)
Publication Date:
OSTI Identifier:
21611656
Resource Type:
Journal Article
Journal Name:
AIP Conference Proceedings
Additional Journal Information:
Journal Volume: 1390; Journal Issue: 1; Conference: 2. international symposium on negative ions, beams and sources, Takayama City (Japan), 16-19 Nov 2010; Other Information: DOI: 10.1063/1.3637382; (c) 2011 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); Journal ID: ISSN 0094-243X
Country of Publication:
United States
Language:
English
Subject:
43 PARTICLE ACCELERATORS; 07 ISOTOPES AND RADIATION SOURCES; BEAM CURRENTS; BEAM TRANSPORT; CESIUM; HYDROGEN IONS 1 MINUS; ION SOURCES; NEUTRON SOURCES; NEUTRONS; PLASMA; PLASMA HEATING; SPUTTERING; VISIBLE RADIATION; ALKALI METALS; ANIONS; BARYONS; CHARGED PARTICLES; CURRENTS; ELECTROMAGNETIC RADIATION; ELEMENTARY PARTICLES; ELEMENTS; FERMIONS; HADRONS; HEATING; HYDROGEN IONS; IONS; METALS; NUCLEONS; PARTICLE SOURCES; RADIATION SOURCES; RADIATIONS

Citation Formats

Stockli, Martin P., Han, B. X., Murray, S. N., Pennisi, T. R., Santana, M., and Welton, R. F. Towards Understanding the Cesium Cycle of the Persistent H{sup -} Beams at SNS. United States: N. p., 2011. Web. doi:10.1063/1.3637382.
Stockli, Martin P., Han, B. X., Murray, S. N., Pennisi, T. R., Santana, M., & Welton, R. F. Towards Understanding the Cesium Cycle of the Persistent H{sup -} Beams at SNS. United States. doi:10.1063/1.3637382.
Stockli, Martin P., Han, B. X., Murray, S. N., Pennisi, T. R., Santana, M., and Welton, R. F. Mon . "Towards Understanding the Cesium Cycle of the Persistent H{sup -} Beams at SNS". United States. doi:10.1063/1.3637382.
@article{osti_21611656,
title = {Towards Understanding the Cesium Cycle of the Persistent H{sup -} Beams at SNS},
author = {Stockli, Martin P. and Han, B. X. and Murray, S. N. and Pennisi, T. R. and Santana, M. and Welton, R. F.},
abstractNote = {This paper describes the accomplishments of the SNS H{sup -} ion source, which delivers routinely {approx}50 mA at a 5.4% duty factor with {approx}99% availability, enabling 1 MW beams for neutron production with {approx}90% availability. It discusses the need for increasing reliability and beam current. But mostly it focuses on its unexpected feature: H{sup -} beams that are apparently persistent for up to 5 weeks without adding Cs after an initial dose of less than {approx}5 mg. Thermal emission and sputtering are qualitatively evaluated, and appear consistent with a negligible Cs sputter rate after the initial dose disappears from the Cs plasma. It concludes with a list of future experiments that can shed more light on this apparently unique Cs cycle.},
doi = {10.1063/1.3637382},
journal = {AIP Conference Proceedings},
issn = {0094-243X},
number = 1,
volume = 1390,
place = {United States},
year = {2011},
month = {9}
}