A co-harmonic gyro-oscillator with a novel interaction cavity

Constable, D. A.; Ronald, K.; Phelps, A. D. R.; He, Wenlong; Cross, A. W.; McConville, S. L.; Konoplev, I. V.; Bandurkin, I. V.; Savilov, A. V.; Bratman, V. L.

doi:10.1109/ivelec.2009.5193500

Cited by 5 publications

(1 citation statement)

References 7 publications

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“…Two distinct types of gyro-multiplier exist; single cavity [18]- [21] and multiple cavity [22]- [28] arrangements, with both oscillator and amplifier configurations being investigated. Both systems operate in a similar manner; by tuning the geometry of the device correctly, directly exciting a low harmonic signal resulting in modulation of the azimuthal current on the beam at the 'driven' harmonic and at multiplies of that harmonic.…”

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confidence: 99%

Numerical and Experimental Validation of the Passive Performance of a Coharmonic Gyro-Multiplier Interaction Region

Constable

Phelps

Whyte

et al. 2021

IEEE Trans. Microwave Theory Techn.

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The azimuthally rippled cavity for a large orbit, coharmonic gyro-multiplier, designed to operate at the 2 nd and 4 th harmonics, at frequencies of 37.5 GHz and 75 GHz, respectively, has been numerically and experimentally confirmed to be insensitive to the polarization of quadrupole, TE2,n-like modes, including the 2 nd harmonic operating mode of the multiplier, a cylindrical TE2,2-like waveguide mode. To test the cavity with this mode required the design, construction and measurement of ripple wall mode converters, converting the cylindrical TE2,1 mode to the TE2,2 mode. These were designed to operate at a central frequency of ~37.9 GHz, with predicted mode purity of better than 85%, and 3 dB bandwidth of 161 MHz. The constructed converter had a central operating frequency of 37.7 GHz, with S-parameter measurements used to infer suitable mode purity, and an operational 3 dB bandwidth of 50 MHz. This has allowed farfield phase measurements of the corrugated cavity to be conducted, where the orientation of the geometry to the polarization of both the TE2,1 and TE2,2 modes was shown to have no effect on the dispersion.

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confidence: 99%

Numerical and Experimental Validation of the Passive Performance of a Coharmonic Gyro-Multiplier Interaction Region

Constable

Phelps

Whyte

et al. 2021

IEEE Trans. Microwave Theory Techn.

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Passive components for the testing of a co-harmonic gyrotron cavity

Constable

Fampris

Ronald

et al. 2011

2nd Annual Passive RF and Microwave Components Seminar

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A key design process in the construction of a waveguide cavity or component is the so-called cold test stage. This involves measuring the response of the component to radiation, propagating with a specific electromagnetic mode and a certain frequency, or range of frequencies. However, for components that require testing with high order modes, such as resonant cavities used in high-power, or high-harmonic gyrotrons, it can be challenging to generate the necessary mode. A scheme for co-harmonic generation of radiation through the cyclotron resonance maser (CRM) instability has previously been proposed [1,2]. Such a scheme involves the generation of two separate harmonics of the electron cyclotron frequency, specifically the 2 nd and 4 th harmonics, within the same geometry. The two electromagnetic modes stimulated are the TE 2,2 and TE 4,3 . Unfortunately, the generation of these two modes for cold testing purposes is not a trivial matter.

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Recent progress on a co-harmonic gyrotron

Constable

Ronald

et al. 2011

2011 IEEE International Vacuum Electronics Conference (IVEC)

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A co-harmonic gyro-oscillator with a novel interaction cavity

Cited by 5 publications

References 7 publications

Numerical and Experimental Validation of the Passive Performance of a Coharmonic Gyro-Multiplier Interaction Region

Numerical and Experimental Validation of the Passive Performance of a Coharmonic Gyro-Multiplier Interaction Region

Passive components for the testing of a co-harmonic gyrotron cavity

Recent progress on a co-harmonic gyrotron

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