1-6 September 2019
Lanzhou
Asia/Shanghai timezone
The deadline for the ICIS 2019 manuscript submission is extended to September 30. All oral presentations have been uploaded on the page of 'timetable'.

Upgrading the LANSCE Accelerator Complex with a SNS RF-driven H- Ion Source

3 Sep 2019, 16:00
20m
Lanzhou

Lanzhou

No. 1 Beibinhe East Road, Chengguan District, Lanzhou
Contributed oral

Speaker

Martin Stockli (Oak Ridge National Laboratory)

Description

The LANSCE (Los Alamos Neutron Science CEnter) accelerator complex is currently driven by a filament-powered, biased converter-type H- ion source that operates at a high plasma duty factor of 10%. This is the world’s highest duty factor for pulsed high-current H- accelerators using only ~2.2 sccm of H2 (standard cubic centimeter per minute). The ion source needs to be replaced every 4 weeks with a ~4 day startup phase. The measured negative beam current of 16-18 mA falls below the desired 21 mA acceptance of the LANCSE accelerator especially since the beam contains several mA of electrons.
On the other hand 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 ~99.9%, but requiring ~30 sccm of H2. Up to 7 A·hrs of H- have been produced during the up to 14-week long service cycles, which is an unprecedented lifetime for small emittance, high-current pulsed H- ion sources. The SNS source also features unprecedented low Cs consumption and can be installed and started up in <10 h.
LANSCE and SNS are considering the use of a SNS H- ion source on the LANSCE accelerator because it should a) decrease the source replacement time by a factor of ~8, b) increase source lifetime by a factor of 2-3, and c) increase the accelerator power by up to ~40%. However, this is a significant challenge as characteristics and normal operating regimes are drastically different. This talk will report on operating the SNS source with a 10% duty factor and adapting the small-diameter, small-emittance SNS beam to the 2-solenoid magnetic LANSCE LEBT (low- energy beam transport).

Acknowledgment:
This work is performed at Los Alamos National Laboratory under contract DE-AC52-06NA25396 and at Oak Ridge National Laboratory under contract DE-AC05-00OR22725 and for the U.S. Department of Energy.

Category of your contribution Negative ion sources

Primary authors

Martin Stockli (Oak Ridge National Laboratory) Ilija Draganic (Los Alamos National Laboratory) Baoxi Han (Oak Ridge National Laboratory) Yuri Batygin (Los Alamos National Laboratory) Mike Clemmer (Oak Ridge National Laboratory) Sarah Cousineau (Oak Ridge National Laboratory) Vadim Dudnikov (Muons, Inc) Robert Garnett (Los Alamos National Laboratory) Alan Justice (Oak Ridge National Laboratory) Yoon Kang (Oak Ridge National Laboratory) David Kleinjan (Los Alamos National Laboratory) Jacob Medina (Los Alamos National Laboratory) Joel Montross (Los Alamos National Laboratory) Syd Murray (Oak Ridge National Laboratory) Terry Pennisi (Oak Ridge National Laboratory) Chip Piller (Oak Ridge National Laboratory) Gary Rouleau (Los Alamos National Laboratory) Chris Stinson (Oak Ridge National Laboratory) Robert Welton (Oak Ridge National Laboratory )

Presentation Materials

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