Simulation and measurement of frequency modulation in submillimeter-wave gyrotron

Author

Pereyaslavets, Michael ; Idehara, Toshitaka ; Nishida, Naoki ; Yoshida, Kiyohiko ; Ogawa, Isamu

Author_Institution

Dept. of Appl. Phys., Fukui Univ., Japan

Volume

27

Issue

2

fYear

1999

fDate

4/1/1999 12:00:00 AM

Firstpage

363

Lastpage

367

Abstract

Frequency modulation of the gyrotron output has been numerically simulated employing the approximation of weakly relativistic, mono-velocity electron beam as well as a quasi-empirical approach. The simulation results are compared to a first experiment in the 300 GHz region performed with a submillimeter-wave gyrotron named “Gyrotron FU IV”. The modulation amplitude of 30 MHz has been achieved by a 120 V modulation of the accelerating voltage resulting in the variation of the relativistic electron mass and in the corresponding modulation of the electron cyclotron frequency. Calculated amplitudes of frequency modulation are in reasonable agreement with the experimental results

Keywords

frequency modulation; gyrotrons; numerical analysis; submillimetre wave tubes; 120 V; 30 MHz; 300 GHz; FM; Gyrotron FU IV; THF; accelerating voltage; electron cyclotron frequency; frequency modulation; gyrotron output modulation; numerical simulation; submillimeter-wave gyrotron; weakly relativistic mono-velocity electron beam; Acceleration; Amplitude modulation; Cyclotrons; Electrons; Frequency measurement; Frequency modulation; Gyrotrons; Magnetic fields; Optical modulation; Voltage;

fLanguage

English

Journal_Title

Plasma Science, IEEE Transactions on

Publisher

ieee

ISSN

0093-3813

Type

jour

DOI

10.1109/27.772262

Filename

772262