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

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

doi:10.1063/1.5129673

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

Journal Article · 22 January 2020 · Review of Scientific Instruments

DOI: https://doi.org/10.1063/1.5129673 · OSTI ID:1593178

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

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.

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Sponsoring Organization:: USDOE

Grant/Contract Number:: AC05-00OR22725; AC52-06NA25396

OSTI ID:: 1593178

Journal Information:: Review of Scientific Instruments, Journal Name: Review of Scientific Instruments Journal Issue: 1 Vol. 91; ISSN 0034-6748

Publisher:: American Institute of PhysicsCopyright Statement

Country of Publication:: United States

Language:: English

References (13)

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Physical Insights and Test Stand Results for the LANSCE H− Surface Converter Source Sherman, Joseph PRODUCTION AND NEUTRALIZATION OF NEGATIVE IONS AND BEAMS: 10th International Symposium on Production and Neutralization of Negative Ions and Beams, AIP Conference Proceedings https://doi.org/10.1063/1.1908301	conference	January 2005
Ramping Up the SNS Beam Power with the LBNL Baseline H[sup −] Source Stockli, Martin P.; Han, B. X.; Murray, S. N. NEGATIVE IONS, BEAMS AND SOURCES: Proceedings of the 1st International Symposium on Negative Ions, Beams and Sources, AIP Conference Proceedings https://doi.org/10.1063/1.3112516	conference	January 2009
Ramping up the Spallation Neutron Source beam power with the H− source using 0 mg Cs/day Stockli, M. P.; Han, B.; Murray, S. N. Review of Scientific Instruments, Vol. 81, Issue 2 https://doi.org/10.1063/1.3325085	journal	February 2010
Towards Understanding the Cesium Cycle of the Persistent H[sup −] Beams at SNS Stockli, Martin P.; Han, B. X.; Murray, S. N. SECOND INTERNATIONAL SYMPOSIUM ON NEGATIVE IONS, BEAMS AND SOURCES, AIP Conference Proceedings https://doi.org/10.1063/1.3637382	conference	January 2011
Producing persistent, high-current, high-duty-factor H − beams for routine 1 MW operation of Spallation Neutron Source (invited) Stockli, Martin P.; Han, B. X.; Hardek, T. W. Review of Scientific Instruments, Vol. 83, Issue 2 https://doi.org/10.1063/1.3681921	journal	February 2012
Different approaches to modeling the LANSCE H ⁻ ion source filament performance Draganic, I. N.; O’Hara, J. F.; Rybarcyk, L. J. Review of Scientific Instruments, Vol. 87, Issue 2 https://doi.org/10.1063/1.4932559	journal	February 2016
Recent performance of and plasma outage studies with the SNS H − source Stockli, M. P.; Han, B.; Murray, S. N. Review of Scientific Instruments, Vol. 87, Issue 2 https://doi.org/10.1063/1.4935640	journal	February 2016
Characterization of the CW starter plasma RF matching network for operating the SNS H − ion source with lower H 2 flows Han, B. X.; Stockli, M. P.; Kang, Y. Review of Scientific Instruments, Vol. 87, Issue 2 https://doi.org/10.1063/1.4937772	journal	February 2016
Record productions establish RF-driven sources as the standard for generating high-duty-factor, high-current H − beams for accelerators (Winner of the ICIS 2017 Brightness Award) Stockli, Martin P.; Welton, Robert F.; Han, Baoxi Review of Scientific Instruments, Vol. 89, Issue 5 https://doi.org/10.1063/1.5025328	journal	May 2018
LANSCE Accelerator Update and Future Plans Garnett, Robert W. Journal of Physics: Conference Series, Vol. 1021 https://doi.org/10.1088/1742-6596/1021/1/012001	journal	May 2018

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