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

Martin P. Stockli, B. X. Han, T. W. Hardek, Y. W. Kang, S. N. Murray, T. R. Pennisi, C. Piller, M. Santana, R. Welton

Research output: Contribution to journalArticlepeer-review

29 Scopus citations

Abstract

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.

Original languageEnglish
Article number02A732
JournalReview of Scientific Instruments
Volume83
Issue number2
DOIs
StatePublished - Feb 2012
Externally publishedYes

Funding

We are grateful to LBNL for delivering the highly capable SNS front end. We also acknowledge various contributions from numerous SNS colleagues, who contributed to this success. Work was performed at Oak Ridge National Laboratory, which is managed by UT-Battelle, LLC, under contract DE-AC05-00OR22725 for the U.S. Department of Energy.

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