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 language | English |
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Article number | 02A732 |
Journal | Review of Scientific Instruments |
Volume | 83 |
Issue number | 2 |
DOIs | |
State | Published - Feb 2012 |
Externally published | Yes |
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.