By Kenneth J. Button
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Physical Mechanism of the Cyclotron-Resonance Maser B. Efficiency Enhancement in Cyclotron-Resonance Masers C. Development of Cyclotron-Resonance Maser Sources 21 24 26 27 28 32 33 34 37 39 OTHER NOVEL SOURCES 40 POTENTIAL APPLICATIONS 41 REFERENCES 44 I. General Introduction In recent years there has been considerable renewed interest in the development of novel devices for the production of high-power coherent electromagnetic radiation. This interest has been motivated largely by the realization that, with existing technology, certain processes utilizing relativistic electron beams can produce coherent electromagnetic radiation at power levels far in excess of those achieved by conventional electron devices.
45 KINETIC THEORY Properties of the Slotted Cavity Assumptions and Basic Equations Calculation of Input Power Pin Discussion Specification of Beam-Distribution Function Threshold Beam Power Optimal Beam Position and Harmonic Number Effect of Beam Radial Spread Optimization of Slot Depth III. CHARACTERISTICS IV. SUMMARY AND DISCUSSION APPENDIX: TE OF OPERATION 47 47 50 55 64 64 65 67 68 68 69 71 M O D E OF THE SLOTTED WAVEGUIDE AND CAVITY REFERENCES 71 75 I. Introduction It is well known that the gyrotron as a coherent millimeter-wave source is capable of generating unprecedented power levels.
Another interesting alternative is a two-stage FEL scheme in which a single electron beam is used. Here the first stage is basically identical to the usual FEL using a wiggler field. The radiation produced in the first stage is reflected and becomes the pump field for the second stage. The final radiation wavelength is λ ~ >lw/8yo· Therefore, electron-beam energies of ~ 5 MeV would be necessary to obtain radiation in the optical regime. Both these schemes however can be shown to have a low gain per pass, and, since beams with extremely low energy spreads are necessary, the 2.