The harmonic multiplying gyrotron can reduce the drive frequency as well as the magnetic field by a factor equal to the harmonic number, but mode competition constitutes the main difficulty for the device adopting the traveling wave as output. To avoid the mode competition, we design a Ka-band Phigtron (Phase coherent harmonic multiplying inverted gyrotwystron) with a novel output in the form of coupled ball-cavity which is characterized by high mode selectivity, high power and extended interaction. The device uses a magnetron injection gun (MIG) to produce its electron beam. The drive signal is applied via a Ku-band input coupler. By amplification of the TEO1 drive wave through the fundamental harmonic (s=1) cyclotron in the gyro-TWT section, the signal at harmonic of the drive frequency is nonlinearly generated in the electron beam. The amplified wave is absorbed in a matched load at the end of the gyro-TWT section, but all harmonic components in the beam current continue to evolve in the drift section due to ballistic bunching. The growth process of harmonic components in the beam current is a nonlinear aspect of cyclotron maser bunching, and provides the basis for harmonic-multiplication[1]. The entrance to the output ball-coupled cavity is placed at the position where the second harmonic component in the current density reaches a value near its maximum. Thereby, a cavity mode is excited which is resonant at twice the frequency of the drive signal. This cavity mode grows rapidly through the second harmonic (s=2) cyclotron maser interaction.
A Ka-Band Phigtron With A Novel Coupled Ball-Cavity As Output
2006-09-01
986039 byte
Aufsatz (Konferenz)
Elektronische Ressource
Englisch
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