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| TUPAS080 |
High-Current Proton and Deuterium Extraction Systems
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1835 |
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The PBGUNS code* is used to explore and optimize high-current extraction system designs for hydrogen and deuterium plasmas. Two subjects are explored: first, the PBGUNS simulations are used to evaluate an analytic procedure** for determining suitable plasma electrode shapes for hydrogen-ion beams. Experimental confirmation for this procedure was found in the high-current proton Low-Energy Demonstration Accelerator*** project at Los Alamos. A second subject is to determine via numerical simulations an initial design for a high-quality deuterium ion beam that could be extracted from a microwave ion source. This work builds on many years experience in design and testing of high-current extraction systems for proton and H- injectors. *Steve Bell, Thunderbird Simulations, www.thunderbirdsimulations.com. **J. David Schneider, these Conference proceedings. ***J. D. Sherman, et. al., Rev. of Sci. Instrum. 73(2), 917(2002).
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| TUPAS081 |
A 25-keV, 30-milliamp Hydrogen-ion Injector for a 200-MHz, 750-keV Radio Frequency Quadrupole (RFQ)
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1838 |
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- J. D. Sherman
- F. W. Guy, W. J. Starling, D. A. Swenson, C. A. Willis
Linac Systems, Albuquerque, New Mexico
- J. M. Potter
JP Accelerator Works, Los Alamos, New Mexico
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A four-bar, 200-MHz, 750-keV RFQ is being developed by Linac Systems. The RFQ design requires injection of a 25-keV, approximate 25-mA proton beam to produce a 20-mA 750-keV output beam bunched at 200 MHz. The injector is comprised of a microwave proton source and single einzel lens low-energy beam transport (LEBT) system. For an ideally matched injector beam, the RFQ design predicts > 90% beam transmission. Such a transmission has not yet been measured in the laboratory using a microwave proton source and a single einzel lens LEBT. PBGUNS* simulations are being performed to elucidate the injector performance. Model assumptions and various designs will be presented. Predicted injector phase-space distributions at the RFQ match point will be compared to the RFQ acceptance parameters. *Steve Bell, Thunderbird Simulations, www.thunderbirdsimulations.com.
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