Publication Type
Conference Paper
Journal Name
Review of Scientific Instruments
Publication Date
Volume
83
Issue
2
Conference Name
14th International Conference on Ion Sources
Conference Location
Giardini Naxos, Italy
Conference Sponsor
LNS
Conference Date
-
Abstract
Since 2009, 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 170C.
