Producing persistent, high-current, high-duty-factor H− beams for routine 1 MW operation of Spallation Neutron Source (invited)a

Since 2009, the Spallation Neutron Source (SNS) has been producing neutrons with ion beam powers near 1 MW, which requires the extraction of ∼50 mA H− ions from the ion source with a ∼5% duty factor. The 50 mA are achieved after an initial dose of ∼3 mg of Cs and heating the Cs collar to ∼170 °C. Th...

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Bibliographic Details
Published in:Review of scientific instruments 2012-02, Vol.83 (2), p.02A732-02A732-7
Main Authors: Stockli, Martin P., Han, B. X., Hardek, T. W., Kang, Y. W., Murray, S. N., Pennisi, T. R., Piller, C., Santana, M., Welton, R.
Format: Article
Language:English
Subjects:
BEAM CURRENTS
Beams (radiation)
CESIUM
Collars
DOSES
Extraction
Heating
HYDROGEN IONS 1 MINUS
ION BEAMS
ION SOURCES
NEUTRON SOURCES
PARTICLE ACCELERATORS
SPALLATION
TIN SULFIDES
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Summary:Since 2009, the Spallation Neutron Source (SNS) has been producing neutrons with ion beam powers near 1 MW, which requires the extraction of ∼50 mA H− ions from the ion source with a ∼5% duty factor. The 50 mA are achieved after an initial dose of ∼3 mg of Cs and heating the Cs collar to ∼170 °C. The 50 mA normally persist for the entire 4-week source service cycles. Fundamental processes are reviewed to elucidate the persistence of the SNS H− beams without a steady feed of Cs and why the Cs collar temperature may have to be kept near 170 °C.
ISSN:0034-6748
1089-7623
DOI:10.1063/1.3681921