Coaxial cavities with corrugated inner conductor for gyrotrons

Iatrou, C.T.; Kern, Stefan; Pavelyev, A.B.

doi:10.1109/22.481385

Cited by 143 publications

(72 citation statements)

References 8 publications

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“…In particular, it would be expedient to verify the results for ohmic losses, which are based on the singular integral equation (SIE) method [14] and the space harmonic method (SHM) [12,13]. Both of them provide almost identical results for ohmic losses that are rather different from those based on SIM [3]. They rigorously take into account the geometry of corrugations, but at the same time they essentially use geometrical idealizations.…”

Section: Inspection Of Results Concerning the Eigenvalues And Ohmic Lmentioning

confidence: 99%

“…It can be achieved by the proper choice of the depth of grooves. However, this method can hardly be used to improve the ITER relevant coaxial gyrotrons, since the depth of the grooves should be kept inside the interval 0.2 < d/λ c < 0.25, where λ c is the cutoff wavelength of the operational mode, to avoid self-excitation on the higher cyclotron harmonics [3,5].…”

Section: Resultsmentioning

confidence: 99%

“…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%

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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: Inspection Of Results Concerning the Eigenvalues And Ohmic Lmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

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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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“…An illustrative example is the circular PEC waveguide with axially corrugated wall [34,42,43]. When the number of periodic corrugations N is large enough (N > 2l), field inside the corrugations can be approximated by that of a single axially symmetric TE mode.…”

Section: Circular Dielectric-loaded Waveguide With Anisotropic Impedamentioning

confidence: 99%

Analogy Between Circular Core-Cladding and Impedance Waveguides and Their Membrane Functions

Shcherbinin¹,

Zaginaylov²,

Ткаченко³

2017

PIER M

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Abstract-One-side boundary conditions on the field inside core region are obtained for core-cladding waveguide with anisotropic cladding. The boundary conditions involve two functions acting as components of anisotropic surface impedance for cladding material. These functions are determined in relation to desired values for step-index waveguide and dielectric-lined waveguide with either perfectly or finitely conducting walls. With resulting surface impedance, the perfect analogy between corecladding and impedance waveguide is achieved. Using this analogy, independent eigenvalue problems are obtained for membrane functions of HE and EH waves of core-cladding waveguide. From this result some conclusions about electromagnetic properties of HE and EH waves are drawn.

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“…Mode rarefaction in such a corrugated coaxial cavity gyrotron can be made more effective by optimizing the corrugation parameters [11][12][13].…”

Section: Introductionmentioning

confidence: 99%

Analysis of a Coaxial Waveguide Corrugated With Wedge-Shaped Radial Vanes Considering Azimuthal Harmonic Effects

Singh¹,

Jain²,

Basu³

2004

PIER

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Abstract-The analysis was developed for a coaxial waveguide for two configurations -one in which the central conductor is corrugated in axial slot-wedges, with ridge-wedges between them, and the other in which the outer conductor is provided with radial metal vane-wedges. Azimuthal harmonics were considered in the structure regions, the effects of which were ignored in earlier published analyses based on the surface impedance model to replace the interface between the two structure regions by a homogeneous reactive surface. For both the structure configurations, one and the same form of the dispersion relation with proper interpretation of the symbol for the radius of the ridge/vane was obtained. The dispersion relation obtained by the present analysis was validated against that obtained by other analytical methods reported in the literature.The shape of the dispersion characteristics is found uncontrollable by the structure parameters, and therefore the structure cannot be used for broadbanding a gyro-TWT. However, the plot of the eigenvalue versus the ratio of the outer conductor to ridge/vane radii strongly depended on the ridge/vane parameters. Thus the structure with its cross section tapered and ridge/groove parameters optimized has the potential for providing mode rarefaction in high-power, over-sized, over-moded gyrotrons.

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Coaxial cavities with corrugated inner conductor for gyrotrons

Cited by 143 publications

References 8 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

Analogy Between Circular Core-Cladding and Impedance Waveguides and Their Membrane Functions

Analysis of a Coaxial Waveguide Corrugated With Wedge-Shaped Radial Vanes Considering Azimuthal Harmonic Effects

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