Upgrading the LANSCE accelerator with a SNS RF-driven H- ion source

Martin P. Stockli, Baoxi Han, Mike Clemmer, Sarah M. Cousineau, Alan Justice, Yoon W. Kang, Syd N. Murray, Terry R. Pennisi, Chip Piller, Chris M. Stinson, Robert F. Welton, Ilija N. Draganic, Yuri K. Batygin, Robert W. Garnett, David Kleinjan, Jacob L. Medina, Joel P. Montross, Gary Rouleau, Vadim Dudnikov

Research output: Contribution to journalArticlepeer-review

8 Scopus citations

Abstract

The LANSCE accelerator is currently powered by a filament-driven, biased converter-type H- ion source that operates at 10%, the highest plasma duty factor for this type of source, using only ∼2.2 SCCM of H2. The ion source needs to be replaced every 4 weeks, which takes up to 4 days. The measured negative beam current of 12-16 mA falls below the desired 24 mA acceptance of the LANCSE accelerator. The SNS (Spallation Neutron Source) RF-driven, H- ion source injects ∼50 mA of H- beam into the SNS accelerator at 60 Hz with a 6% duty factor and an availability of >99.5% but requires ∼30 SCCM of H2. Up to 7 A h of H- have been produced during the 14-weeks-long source service cycles, which is unprecedented for small emittance, high-current, pulsed H- ion sources. The emittance of the SNS source is slightly smaller than the emittance of the LANSCE source. The SNS source also features unrivaled low Cs consumption and can be installed and started up in <12 h. LANSCE and SNS are working toward the use of SNS H- ion sources on the LANSCE accelerator because they could (a) fill the LANSCE accelerator to its capacity, (b) decrease the source replacement time by a factor of up to 7, and (c) increase source lifetime by a factor of about 4. This paper discusses some of the challenges that emerge when trying to match a different H- source into an existing injector with significantly different characteristics and operating regimes.

Original languageEnglish
Article number013321
JournalReview of Scientific Instruments
Volume91
Issue number1
DOIs
StatePublished - Jan 1 2020
Externally publishedYes

Funding

This manuscript has been authored under Contract Nos. DE-AC05-00OR22725 and DE-AC52-06NA25396 with the U.S. Department of Energy (DOE). The U.S. government retains, and the publisher, by accepting the article for publication, acknowledges that the U.S. government retains a nonexclusive, paid-up, irrevocable, worldwide license to publish or reproduce the published form of this manuscript or allow others to do so, for U.S. government purposes. DOE will provide public access to these results of federally sponsored research in accordance with the DOE Public Access Plan ( http://energy.gov/downloads/doe-public-access-plan ). This paper benefitted from the skillful proofreading of Dr. Jeff Holmes and the assistance by Lisa Eady, both with the Spallation Neutron Source.

FundersFunder number
U.S. Department of Energy

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