Theory of step-tunable gyrotrons operating at two cyclotron harmonics

The scaling of operating parameters and the tendencies in the efficiency of the step-tunable gyrotron operating in a set of modes in a cavity of a given length are considered. Results of calculations are reported for the design of a /spl sim/1-kW, step-tunable gyrotron oscillator operating from 150 to 600 GHz in steps of about 15 GHz. Detailed results are presented for the efficiency, power losses in the cavity, and the starting conditions. Designs of the electron gun electrodes and of an output mode transducer are also presented. Full modulation of the radiation via the modulating anode of a magnetron injection gun is considered. The gyrotron would be of use for plasma diagnostics and spectroscopy, including electron paramagnetic resonance spectroscopy (EPR).

[1]  M. Thumm,et al.  D-band frequency step-tuning of A 1 MW gyrotron using a brewster output window , 1997 .

[2]  K. Kawahata,et al.  LONG-PULSE OPERATION OF A SUBMILLIMETER WAVE GYROTRON AND ITS APPLICATION TO PLASMA SCATTERING MEASUREMENT , 1994 .

[3]  N. Atherton,et al.  Principles of electron spin resonance , 1993 .

[4]  O. Dumbrajs,et al.  Theory of a frequency-step-tunable gyrotron for optimum plasma ECRH , 1992 .

[5]  T. Grimm,et al.  Experimental Study of a Megawatt 200–300 GHz Gyrotron Oscillator , 1992 .

[6]  G. G. Denisov,et al.  110 GHz gyrotron with a built-in high-efficiency converter , 1992 .

[7]  T. Idehara,et al.  High‐frequency, step tunable, cyclotron harmonic gyrotron , 1991 .

[8]  H. Huey,et al.  Gyrotrons for ECH applications , 1990 .

[9]  Richard J. Temkin,et al.  Experimental study of a high‐frequency megawatt gyrotron oscillator , 1990 .

[10]  G. Brand,et al.  A tunable source of linearly-polarized, near-millmeter wave radiation , 1989 .

[11]  V. A. Flyagin,et al.  Gyrotron oscillators , 1988, Proc. IEEE.

[12]  Temkin,et al.  Single-mode operation of a high-power, step-tunable gyrotron. , 1987, Physical review letters.

[13]  B. G. Danly,et al.  Generalized nonlinear harmonic gyrotron theory , 1986 .

[14]  Gregory S. Nusinovich,et al.  Submillimeter-wave gyrotrons: Theory and experiment , 1983 .

[15]  M. E. Read,et al.  Power limits in cylindrical gyromonotrons using TEon1 modes , 1981 .

[16]  G. Nusinovich,et al.  On the nonlinear theory of a relativistic gyrotron , 1979 .

[17]  K. E. Kreischer,et al.  High frequency gyrotrons and their application to tokamak plasma heating , 1979 .

[18]  M. I. Petelin,et al.  Transformation of a whispering gallery mode, propagating in a circular waveguide, into a beam of waves , 1975 .

[19]  A. F. Krupnov,et al.  Use of high resonant-radiation powers to increase the sensitivity of microwave spectroscopes , 1974 .

[20]  M. I. Petelin,et al.  The formation of helical electron beams in an adiabatic gun , 1973 .

[21]  M. I. Petelin,et al.  Irregular waveguides as open resonators , 1969 .

[22]  M. I. Petelin,et al.  The induced radiation of excited classical oscillators and its use in high-frequency electronics , 1967 .