Mode selective properties of coaxial gyrotron resonators

Iatrou, C.T.

doi:10.1109/27.532942

Cited by 61 publications

(28 citation statements)

References 7 publications

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“…The basic model for the electromagnetic analysis of a coaxial gyrotron cavity is the surface impedance model (SIM) [3][4][5] which is used in several codes [6] for simulation of a coaxial gyrotron operation. It is rather simple and convenient for use in different simulation tools.…”

Section: Introductionmentioning

confidence: 99%

Electromagnetic Analysis of Coaxial Gyrotron Cavity With the Inner Conductor Having Corrugations of an Arbitrary Shape

Zaginaylov¹,

Mitina²

2011

PIER B

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Abstract-The mathematical approach for the calculation of the membrane functions of a coaxial gyrotron cavity with an arbitrary corrugated inner rod is proposed. It is utilized mainly for two aims. First, it is shown that for typical parameters of the coaxial gyrotron cavity with the corrugated inner conductor the shape of corrugations only slightly influences the eigenvalues of competing eigen-modes. However, it can significantly influence the density of ohmic losses in the inner conductor. In particular, it is shown that the density of ohmic losses can be reduced almost twice by the proper choice of the corrugation shape. Second, it is shown that the usual idealizations of the corrugated surface of the inner conductor (the surface with rectangular grooves, having rounded edges, is approximated by a surface with wedged groves that have sharp edges) are correct. The physical interpretation of the obtained results and their practical meaning are discussed.

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Section: Introductionmentioning

confidence: 99%

Electromagnetic Analysis of Coaxial Gyrotron Cavity With the Inner Conductor Having Corrugations of an Arbitrary Shape

Zaginaylov¹,

Mitina²

2011

PIER B

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“…1, the inner radius by R in , the period of corrugations by S, and the width and depth of the slots by L and d. Using (3), (4), (9) and (10), we have …”

Section: Mode Coupling Coefficientsmentioning

confidence: 99%

“…As shown in Fig. 1, the boundary condition of coaxial resonators is complicated, which can be treated according to SIT [7,9] and the rigorous field matching method (RFM) [10][11][12]. Because Q ð2Þ mt in (12) can not be available from RFM (in fact, RFM is only used for the calculation of eigenvalues and ohmic losses of coaxial resonators so far [11,12]), we use SIT to derive the mode coupling coefficients in this paper.…”

Section: Mode Coupling Coefficientsmentioning

confidence: 99%

Study of Eigenmodes of Coaxial Resonators Using Coupled-Wave Theory

Liu

2010

J Infrared Milli Terahz Waves

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Based on the surface impedance theory (SIT) and the coupled-wave theory (CWT), this paper has established the second-order transmission line equation applicable to coaxial resonators with corrugated inner conductor. By utilizing the equation, the resonant frequency, Q factor and field profiles geometry of the eigenmodes of coaxial resonators can be calculated in view of the mode coupling, and the variables of the slot width and depth in the coupling coefficient can also be applied to calculate their impact on the resonant frequency and Q factor. The numerical results show that, the slot width and depth have significant impact on the resonant frequency, but their effect on Q factor is approximately negligible.

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“…The connections of the modegenerator cavity are designed to minimize unwanted mode generation at sharp edges. [22][23][24] The inner rod is inserted at the center of the mode-generator cavity in order to prevent excitation of neighboring modes, with a WR08 waveguide Fig . 4 shows the experimental setup for cold testing the mode-converter systems.…”

Section: B Higher-order Non-rotating Mode Generatormentioning

confidence: 99%

Cold testing of quasi-optical mode converters using a generator for non-rotating high-order gyrotron modes

Kim

Choe

et al. 2014

Review of Scientific Instruments

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Selective suppression of high order axial modes of the gyrotron backward-wave oscillator Phys. Plasmas 14, 093301 (2007) In this paper, we test the performance of a quasi-optical, internal-gyrotron mode converter. When cold testing mode converters, a rotating higher-order mode is commonly used. However, this requires a nontrivial design and precise alignment. We thus propose a new technique for testing gyrotron mode converters by using a simple, non-rotating, higher-order mode generator. We demonstrate the feasibility of this technique for a W-band gyrotron quasi-optical mode converter by examining the excitation of a TE 6,2 mode from a non-rotating mode generator. Our results demonstrate that this new cold-test scheme is an easy and efficient method for verifying the performance of quasi-optical mode converters.

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Mode selective properties of coaxial gyrotron resonators

Cited by 61 publications

References 7 publications

Electromagnetic Analysis of Coaxial Gyrotron Cavity With the Inner Conductor Having Corrugations of an Arbitrary Shape

Electromagnetic Analysis of Coaxial Gyrotron Cavity With the Inner Conductor Having Corrugations of an Arbitrary Shape

Study of Eigenmodes of Coaxial Resonators Using Coupled-Wave Theory

Cold testing of quasi-optical mode converters using a generator for non-rotating high-order gyrotron modes

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