Abstract:
Observations show that the ubiquitous pulse shortening in high-power microwave (HPM) devices arises from the formation of plasma, electron streaming, high-E-field breakdo...Show MoreMetadata
Abstract:
Observations show that the ubiquitous pulse shortening in high-power microwave (HPM) devices arises from the formation of plasma, electron streaming, high-E-field breakdown, and beam disruption. We review recent experiments in terms of these causes. Linear beam devices exhibit all of these mechanisms; in particular, beam disruption by E/spl times/B drifts in the strong microwave fields and diffusion in turbulent electric fields appear common. In relativistic magnetrons, the dominant effect is resonance destruction by cathode plasma motion, possibly from water contamination of the surface. Wall plasma effects shorten pulses in most sources. We call for the introduction of improved surface conditioning, cathodes which do not produce plasmas, and increased effort on the measurements of the high-field and plasma properties of HPM sources. Because of the broad nature of the phenomena in pulse shortening, we appeal for increased participation of the plasma, intense particle beam, and traditional microwave tube communities in pulse-shortening research.
Published in: IEEE Transactions on Plasma Science ( Volume: 25, Issue: 2, April 1997)
DOI: 10.1109/27.602505
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1.
K. Hendricks, "Recent results on pulse sortening of GW class HPM sources", APS Plasma Phys. Meet., 1996.
2.
R. B. Miller, "Pulse-shortening in high-peak-power Reltron tubes", Proc. SPIE 2843.
3.
O. T. Loza, P. S. Strelkov and S. N. Voronkov, "Plasma in a high-power relativistic generator retarding structure", Plasma Phys. Rep., vol. 20, pp. 418, 1994.
4.
X. Zhai, E. Garate, R. Prohaska, A. Fisher and G. Benford, "Electric field measurement in a plasma-filled X-band BWO", Phys. Lett. A, vol. 186, pp. 330, 1994.
5.
E. Garate and X. Zhai, 1996.
6.
G. Benford, Phys Lett. A, 1997.
7.
D. Levron, G. Benford, A. Baranga and J. Means, "Diagnosing superstrong turbulence by forbidden line measurements", Phys. Fluids, vol. 31, pp. 3026, 1988.
8.
S.P. Bugaev, "Relativistic multiwave Cerenkov generators", IEEE Trans. Plasma Sci., vol. 18, pp. 525-536, 1990.
9.
R. Miller, An Introduction to the Physics of Intense Charged Particle Beams., pp. 177-180, 1982.
10.
J. Benford and J. Swegle, High Power Microwaves, pp. 162, 1992.
11.
D. Price, Pulse shortening in tunable relativistic magnetrons, 1996.
12.
"The problem of pulse shorting in relativistic microwave generators", High Power Microwave Generation and Applications, pp. 345, 1992.
13.
J. M. Butler, pp. 61, 1991.
14.
S. P. Bugaev, "Movement of emission boundary of cathode plasma across uniform magnetic field in diodes with explosive emission", Reports USSR Academy of Sci., vol. 46, pp. 78-83, 1982.
15.
A. F. Alexandrov, "Broadening of a relativistic electron beam in Cerenkov-radiation source", Sov. Tech. Phys. Lett, vol. 14, pp. 3499-350, 1988.
16.
S. N. Voronkov, "Effect of the cathode plasma on the operation of a relativistic carcinatron with microsecond pulselength", Plasma Phys. Rep., vol. 19, pp. 309-311, 1993.
17.
S. P. Bugaev, "Method for the propagation of the cathode plasma across the magnetic field in foilless diodes", Sov. J. Plasma Phys., vol. 7, pp. 286-292, 1981.
18.
G. Caryotakis, "High power microwave tubes: In the laboratory and on-line", IEEE Trans. Plasma Sci., vol. 22, pp. 683-691, 1994.
19.
G. A. Loew and J. W. Wang, "Progress report on high gradient RF studies in copper accelerator structures", Proc 14th Int. Symp. on Discharge and Electrical Insulation in Vacuum, 1990.
20.
C. Grabowski, J. Gahl, E. Schamiloglu and C. B. Fleddermann, "Pulse shortening in high power backward wave oscillators", Proc. SPIE Intense Microwaves IV, vol. 2843, pp. 251-259, 1996.
