High‐current electron beams

MAY 01, 1975

Megajoule pulses of electrons that exceed the total power output of the US electrical grid are finding exciting uses in lasers, microwave communications and nuclear fusion.

DOI: 10.1063/1.3068965

Hans H. Fleischmann

The rapid development of new technologies over the past decade has greatly expanded the capabilities of relativistic electron beams. While electron beams constitute one of the oldest particle beams available to physicists, the strengths of such beams were limited to a few amperes up to the early 1960’s. Since then, however, a new type of accelerator has been developed that permits electron‐beam bursts of many kiloamperes—and even megamperes—to be accelerated to energies of several megavolts. The most recent facility of this type at Cornell University, shown on the cover of this issue of PHYSICS TODAY, is capable of accelerating a 15‐kA beam of electrons to 5 MeV. Figure 1 shows Aurora, the largest facility of this type presently operating, which is able to accelerate 160‐nanosecond pulses of electron beams of up to 1.6 megamperes to energies as high as 12 MeV.

References

1. PHYSICS TODAY, April 1973, page 17.
2. R. F. Post, PHYSICS TODAY, April 1973, page 30.
3. G. Yonas, J. W. Poukey, K. R. Prestwich, J. R. Freeman, A. J. Toepfer, M. Clauser, Nucl. Fusion 14, 731 (1974).https://doi.org/NUFUAU
4. J. Nuckolls, J. Emmett, L. Wood, PHYSICS TODAY, August 1973, page 46.
5. N. C. Christofilos, in Proceedings of the Second United Nations International Conference on the Peaceful Uses of Atomic Energy, United Nations, Geneva, Switzerland (1958), volume 32, page 279.
6. H. Fleischmann, in Proceedings of the Conference on Electrostatic and Electromagnetic Confinement of Plasmas and the Phenomenology of High‐Current Electron Beams, 5–8 March 1974, New York Academy of Sciences, New York (1974);
Cornell report LPS 143, March 1974.
7. R. T. Hodgson, R. W. Dreyfus, Phys. Rev. Lett. 28, 536 (1972).https://doi.org/PRLTAO
8. N. G. Basov, V. A. Danilychenko, Yu. M. Popov, Sov. J. Quantum Electron. 1, 18 (1971).https://doi.org/SJQEAF
9. R. A. Gerber, E. L. Patterson, L. S. Blair, N. R. Greiner, Appl. Phys. Lett. 25, 281 (1974).https://doi.org/APPLAB
10. V. L. Granatstein, M. Herndon, Y. Carmel, J. A. Nation, Plasma Physics 17, 23 (1975).https://doi.org/PLPHBZ
11. Y. Carmel, J. Ivers, R. E. Kribel, J. A. Nation, Phys. Rev. Lett. 33, 1278 (1974).https://doi.org/PRLTAO
12. S. E. Graybill, Proceedings of the International Conference on Multiply‐Charged Heavy‐Ion Sources and Accelerating Systems, Gatlinburg, Tenn., Oct. 1971,
and IEEE Trans. Nucl. Sci., N.S. 19, No. 2, 292 (1972).
13. G. Yonas, IEEE Trans. Nucl. Sci., N.S. 19, No. 2, 297 (1972).

More about the Authors

Hans H. Fleischmann. Associate Professor of Applied Physics, Cornell University.