An intense ion source has been developed utilizing an ion diode that partially suppresses electron flow using the self‐magnetic field of the diode current. This is an extension of a diode class known as pinch reflex ion diodes. In this case the diode was coupled to the particle beam fusion accelerator and was configured in two different cylindrical designs. The first pinch ion diode was a straight, 42‐cm‐diam cylinder and the second, Obi, was a focusing, 26‐cm‐diam, aspheric barrel. In the Obi diode a central gas cell provided current‐neutralized beam transport. In addition, the accelerator was run in a low‐voltage, 0.8 MV, and a high‐voltage, 2.0 MV, mode. The best results showed that the Obi diode produced 3 TW of protons at 34% efficiency in the high‐voltage mode. We present an analytic model of ion efficiency, compare various diode impedance models, and discuss beam divergence mechanisms. The limitation of this ion source as a fusion driver is presently the 2–3° divergence that we measure using a shadow‐box technique. A companion paper contains numerical simulations and further analytic modeling.
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1 March 1984
Research Article|
March 01 1984
Self‐magnetic‐field‐enhanced ion diode
J. N. Olsen;
J. N. Olsen
Sandia National Laboratories, Albuquerque, New Mexico 87185
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S. E. Rosenthal;
S. E. Rosenthal
Sandia National Laboratories, Albuquerque, New Mexico 87185
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L. P. Mix;
L. P. Mix
Sandia National Laboratories, Albuquerque, New Mexico 87185
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D. B. Seidel;
D. B. Seidel
Sandia National Laboratories, Albuquerque, New Mexico 87185
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R. J. Anderson;
R. J. Anderson
Sandia National Laboratories, Albuquerque, New Mexico 87185
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P. L. Dreike;
P. L. Dreike
Sandia National Laboratories, Albuquerque, New Mexico 87185
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R. J. Leeper
R. J. Leeper
Sandia National Laboratories, Albuquerque, New Mexico 87185
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J. Appl. Phys. 55, 1254–1266 (1984)
Article history
Received:
August 26 1983
Accepted:
November 14 1983
Citation
J. N. Olsen, S. E. Rosenthal, L. P. Mix, D. B. Seidel, R. J. Anderson, P. L. Dreike, R. J. Leeper; Self‐magnetic‐field‐enhanced ion diode. J. Appl. Phys. 1 March 1984; 55 (5): 1254–1266. https://doi.org/10.1063/1.333213
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