Design of a waveguide resonator with ripled wall reflectors for a 100 GHz CARM oscillator experiment†

McCowan, R. B.; Fliflet, A. W.; Gold, Steven H.; Granatstein, V.L.; Wangh, M. C.

doi:10.1080/00207218808945245

Cited by 42 publications

(14 citation statements)

References 2 publications

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“…To prevent the wave energy from leaking to the electron gun and to obtain a high level of the power in the output port of the resonator in a CARM oscillator, one should let the reflectivity of the upstream reflector be~0.99 and the reflectivity of the downstream be~0.9 [3]. Moreover, bandwidth of the reflectors must be sufficiently narrow to retain only one high-Q axial mode.…”

Section: Basic Consideration Of Scattering Matrix Methodsmentioning

confidence: 99%

Comparison between Single-mode Treatment and Multi-mode Treatment of a Coaxial Bragg Resonator for a Terahertz Cyclotron Autoresonance Maser Oscillator

Zhang

et al. 2010

J Infrared Milli Terahz Waves

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As a coaxial Bragg structure has more complex geometry configuration than a cylindrical or a planar Bragg structure, for simplicity of calculation a single-mode treatment is often adopted. However, heterogeneity of a coaxial Bragg structure always gives rise to the multi-mode conversion, which can change the performance of the resonator. Based on the scattering matrix method, detailed comparison between the single-mode treatment and the multi-mode treatment is presented to a coaxial Bragg resonator for a cyclotron autoresonance maser (CARM) oscillator operating in the higher-order mode TE 61 at frequency of 0.35 THz. Results indicate that there is a little difference between the results obtained by these two treatments to the upstream reflector due to its shallow ripple amplitude, whereas to the downstream reflector, due to its relatively deep ripple amplitude, an apparent difference occurs at the operating frequency and consequently it gives notable difference to the frequency response and Q-factor of the whole resonator. Optimization shows possible application of a coaxial Bragg resonator with a single higher-order mode operation in constructing a terahertz CARM oscillator.

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Section: Basic Consideration Of Scattering Matrix Methodsmentioning

confidence: 99%

Comparison between Single-mode Treatment and Multi-mode Treatment of a Coaxial Bragg Resonator for a Terahertz Cyclotron Autoresonance Maser Oscillator

Zhang

et al. 2010

J Infrared Milli Terahz Waves

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“…The TE 6 1 mode is expected to resonate at 100 GHz, the TE 5 1 mode should oscillate at 97 GHz, and the TE 7 1 mode should occur at 103 GHz. 9 The current required to produce microwaves was higher than the predicted cold-beam start current for the CARM oscillator. This suggests that the electron beam had greater spread than that predicted by the electron trajectory codes, possibly due to a lower beam quality than predicted by our numerical simulations.…”

Section: IImentioning

confidence: 99%

“…where G is the coupling coefficient for the reflection 9 , which is a function of the ripple amplitude and the specific transverse eigenfunction of the mode, and L is the length of 4 the corrugations. Whispering-gallery (TEmi, m>>l) modes couple most strongly to the corrugations, and therefore have the highest reflectivities.…”

Section: Introductionmentioning

confidence: 99%

Observation of Harmonic Gyro-Backward-Wave Oscillation in a 100 GHz CARM Oscillator Experiment

McCowan

Sullivan

Gold

et al. 1991

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“…For example, a CARM oscillator operating at a frequency of 100 GHz with an output power of 24 MW was developed at the U.S. Naval Research Laboratory (NRL) [3], [4]. Generally speaking, a Bragg resonator is regarded as the most suitable cavity structure for the overmoded CARM oscillators [5], because it can provide good mode selectivity and high quality factor for the selected mode.…”

Section: Introductionmentioning

confidence: 99%

A Coaxial Bragg Reflector for Cyclotron Autoresonance Maser Oscillators

Lai

Zhang

2007

IEEE Microw. Wireless Compon. Lett.

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A coaxial Bragg reflector is suggested for the application in the cyclotron autoresonance masers (CARMs), where both the outer wall and inner rod are corrugated with weak axisymmetric-sinusoidal-ripple, and a concept design is presented. It is found that, compared to the cylindrical Bragg reflector, the coaxial Bragg reflector has larger dimensional size, narrower bandwidth, and larger eigenvalue intervals. These peculiarities are favorable to the mode selectivity, the ability of dissipating the ohmic heat on the wall, the oscillating startup of the operating mode, and machining manufacture, and therefore, this new kind of Bragg reflector can be developed into a coaxial resonator for the high-power CARMs.

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Design of a waveguide resonator with ripled wall reflectors for a 100 GHz CARM oscillator experiment†

Cited by 42 publications

References 2 publications

Comparison between Single-mode Treatment and Multi-mode Treatment of a Coaxial Bragg Resonator for a Terahertz Cyclotron Autoresonance Maser Oscillator

Comparison between Single-mode Treatment and Multi-mode Treatment of a Coaxial Bragg Resonator for a Terahertz Cyclotron Autoresonance Maser Oscillator

Observation of Harmonic Gyro-Backward-Wave Oscillation in a 100 GHz CARM Oscillator Experiment

A Coaxial Bragg Reflector for Cyclotron Autoresonance Maser Oscillators

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