Characteristics of a RF-Driven Ion Source for a Neutron Generator Used For Associated Particle Imaging Page: 5 of 6
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that the amount of H ions is also minimal. Thus the
mass 2 fully dominated by D+ ions.
Hydrogen/Deuterium Mix Mass Spectrum
D , H'
The author would like to thank Steve Wilde, Paul
Wong, Tom McVeigh, and Will Waldron for their
technical support. This work was supported by the
DOE under contract DE-AC02-05CH11231 and
the DIA under contract number HHM40271611.
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A prototype compact RF-driven neutron generator
for API has been built and the ion source
characteristics measured. Experiments show that the
RF-driven ion source using quartz as the source
material and an external planar antenna will be able to
provide an upgrade in source efficiency at both 13.56
and 27.12 MHz over the Penning source by producing
over 85% atomic ions and thus allowing the neutron
yield to increase and the beam spot to decrease without
overheating the target. Experiments with deuterium
and hydrogen have shown that using deuterium at the
same power and pressure as hydrogen yields a higher
current density, a higher atomic ion fraction, higher
electron density, and lower operating pressures.
Therefore, it is expected that using a mixture gas of
deuterium and tritium would result in even higher
atomic ion fraction and lower operating pressures.
This source also demonstrated that a mixture of
deuterium and hydrogen has no effect on the ion
species as the atomic ions dominated. A deuterium-
tritium mixture is expected to behave similarly. Future
work will involve measurement of the beam spot at 80
kV, testing the neutron yield with deuterium, and
operating the system in a sealed environment.
9. L. E.Ussery and C. L.Hollas, "Design and Development
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Technique", Rep. LA-12847- MS (UC-706 and UC-700),
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Wu, Ying; Hurley, John P.; Ji, Qing; Kwan, Joe & Leung, Ka-Ngo. Characteristics of a RF-Driven Ion Source for a Neutron Generator Used For Associated Particle Imaging, article, August 8, 2008; Berkeley, California. (https://digital.library.unt.edu/ark:/67531/metadc1013252/m1/5/: accessed March 20, 2019), University of North Texas Libraries, Digital Library, https://digital.library.unt.edu; crediting UNT Libraries Government Documents Department.