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

Martin P Stockli¹, Baoxi Han¹, Mike Clemmer¹

¹Spallation Neutron Source, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37830, USA.

The Review of Scientific Instruments

|February 5, 2020

Summary

The LANSCE accelerator may upgrade its H- ion source to an SNS RF-driven source, potentially increasing beam current and lifetime while reducing downtime. This transition addresses current source limitations and aims to optimize accelerator performance.

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Area of Science:

Accelerator Physics
Ion Source Technology
Particle Accelerators

Background:

The LANSCE accelerator currently uses a filament-driven H- ion source with limitations in beam current and frequent replacement requirements.
The existing source operates at a 10% plasma duty factor, requiring replacement every 4 weeks, causing significant downtime.
The current beam current of 12-16 mA is below the LANSCE accelerator's 24 mA acceptance.

Purpose of the Study:

To evaluate the feasibility and challenges of integrating the Spallation Neutron Source (SNS) RF-driven H- ion source into the LANSCE accelerator.
To determine if the SNS source can meet LANSCE's requirements for higher beam current and improved operational efficiency.
To analyze the potential benefits, including increased beam current, extended source lifetime, and reduced maintenance downtime.

Main Methods:

Comparative analysis of the operational parameters and performance metrics of the LANSCE and SNS H- ion sources.
Review of the technical specifications, including beam current, duty factor, gas consumption, and emittance.
Discussion of the engineering challenges associated with adapting the SNS source to the LANSCE injector system.

Main Results:

The SNS RF-driven H- ion source delivers a higher beam current (∼50 mA) at a 6% duty factor compared to the LANSCE source.
The SNS source demonstrates a significantly longer operational lifetime (up to 7 A h) and higher availability (>99.5%).
The SNS source requires more H2 gas (∼30 SCCM) but offers faster installation (<12 h) and lower Cesium consumption.

Conclusions:

The SNS H- ion source presents a promising upgrade for the LANSCE accelerator, offering substantial improvements in beam current and operational efficiency.
Successful integration could decrease source replacement time by a factor of 7 and increase source lifetime by a factor of 4.
Addressing the differing characteristics and operating regimes between the two sources is crucial for successful implementation.