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Different approaches to modeling the LANSCE H⁻ ion source filament performance
I N Draganic1, J F O'Hara1, L J Rybarcyk1
1Los Alamos National Laboratory, Los Alamos, New Mexico 87545, USA.
The Review of Scientific Instruments
|March 3, 2016
Summary
Modeling hot tungsten filament performance in the Los Alamos Neutron Science Center (LANSCE) ion source prevents failures. Simulations support increased beam production rates for the H(-) surface converter.
Area of Science:
- Plasma physics
- Materials science
- Accelerator technology
Background:
- Hot tungsten filaments are critical components in the Los Alamos Neutron Science Center (LANSCE) H(-) surface converter ion source.
- Filaments operate at high temperatures (2600 K-2700 K), making them susceptible to failures like hot spots and wire breakage.
Purpose of the Study:
- To model the performance of hot tungsten filaments in the LANSCE ion source.
- To prevent catastrophic filament failures and understand material erosion.
- To support the operational upgrade from 60 Hz to 120 Hz beam pulse repetition rate.
Main Methods:
- A semi-empirical model was developed.
- A thermal finite-element analysis (FEA) model was employed.
- An analytical model was utilized for comparison.
Main Results:
- All three models were compared against operational data from LANSCE.
- The models provided insights into filament behavior under operational conditions.
- Simulation results aided in the successful transition to a higher beam pulse repetition rate.
Conclusions:
- Modeling is essential for understanding and preventing failures in high-temperature ion source filaments.
- The developed models successfully supported the operational upgrade of the LANSCE ion source.
- Further research can refine these models for improved ion source performance and longevity.
