165 GHz, 1.5 MW-coaxial cavity gyrotron with depressed collector

Piosczyk, B.; Braz, O.; Dammertz, G.; Iatrou, C.T.; Illy, S.; Kuntze, M.; Michel, G.; Thumm, M.

doi:10.1109/27.772277

Cited by 40 publications

(8 citation statements)

References 8 publications

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“…Increase in surface impedance leads to the reduction of magnetic field and henceforth ohmic losses. Normalized field amplitude and wall losses for a different number of slots for rectangular corrugated insert for coaxial cavity gyrotron given in [5] and [20] are for a different number of slots for triangular corrugated coaxial cavity using parameters given in Table I. shown in Fig. 4.…”

Section: Wall Losses and Ohmic Quality Factormentioning

confidence: 99%

“…4. Normalized field amplitude of slot and wall losses for TE 31,17 for a different number of slots for rectangular corrugated coaxial cavity using parameters given in [5] and [20].…”

Section: Wall Losses and Ohmic Quality Factormentioning

confidence: 99%

“…Wall losses lead to heating of the insert and when a number of slots are more, it may cause more problems as the heat will get less area to spread. Calculating the average losses between the two slot at the bottom wall (using already reported results [20] and assuming the heat distributes evenly) gives loss of 0.228 kW/cm 2 . This average loss can be reduced by increasing the distance between the slots when the loss increases, as in triangular case.…”

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confidence: 98%

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Analysis of a Triangular Corrugated Coaxial Cavity for Megawatt-Class Gyrotron

Singha

Kartikeyan

2015

IEEE Trans. Electron Devices

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Field analysis for coaxial cavity with triangular corrugations on the inner rod (insert) to be used for megawattclass gyrotron has been done. Mathematical formulation for its dispersion relation, wall losses, and quality factor has been presented. Quality factor for open-ended triangular corrugated cavity has been computed by solving Vlasov's equation. The advantage of the mentioned structure is that it offers higher number of slots to be accommodated, which reduces the wall losses in the insert without causing heating problems between the slots. Incorporating corrugations on the insert leads to significant changes in the field structure inside the cavity. The mode eigenvalue, wall losses, and quality factor for such a cavity have been found to be heavily dependant on radii ratio (C = R 0 /R i ). Quality factor of desired and competing modes can be controlled by integrating a tapered insert. A coaxial cavity design for 204 GHz, 2 MW with TE 44,26 as a desired mode is given. Wall losses, quality factor, and coupling coefficient for desired and competing modes have been calculated.Index Terms-Coaxial cavity gyrotron, diffractive quality factor, ohmic quality factor, surface impedance method (SIM).

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Section: Wall Losses and Ohmic Quality Factormentioning

confidence: 99%

“…4. Normalized field amplitude of slot and wall losses for TE 31,17 for a different number of slots for rectangular corrugated coaxial cavity using parameters given in [5] and [20].…”

Section: Wall Losses and Ohmic Quality Factormentioning

confidence: 99%

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confidence: 98%

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Analysis of a Triangular Corrugated Coaxial Cavity for Megawatt-Class Gyrotron

Singha

Kartikeyan

2015

IEEE Trans. Electron Devices

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“…which for R s = 0 reduces to the usual boundary condition (3). We now can formulate a generalized boundary condition for the second equation of the system (1)…”

Section: Formalismmentioning

confidence: 99%

“…To reduce the costs of the electron cyclotron wave system, an increase of the output power per unit to about 2 MW is desirable. Coaxial cavity gyrotrons have the potential to fulfil this requirement as has been demonstrated within a development program performed as an ITER task at Forschungszentrum Karlsruhe [1][2][3][4][5][6]. In particular, the following experimental studies have been performed with the coaxial gyrotron operating in the TE − 31,17 mode at 165 GHz:…”

Section: Introductionmentioning

confidence: 99%

Influence of reflections on the operation of the 2 MW, CW 170 GHz coaxial cavity gyrotron for ITER

et al. 2003

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The influence of reflections on the operation of the 2 MW, CW 170 GHz coaxial cavity gyrotron oscillating in the TE − 34,19 mode is studied. In particular, frequency-independent power reflections, e.g. from plasma or some elements of the transmission line, larger than 1% and occurring in a poor phase may lead to oscillation breakdown and should be avoided. Frequency-dependent reflections from a specially designed diamond window influence mode competition, but contract the oscillation region of the operating mode noticeably only under the unrealistic assumption that all reflected power returns to the cavity. The conclusion is that the gyrotron is sufficiently robust against possible negative effects related to reflections.

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Magnetic Field Sensitivity in Depressed Collector for a Millimeter-Wave Gyrotron

Kesari

Seshadri

2018

Lecture Notes in Electrical Engineering

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165 GHz, 1.5 MW-coaxial cavity gyrotron with depressed collector

Cited by 40 publications

References 8 publications

Analysis of a Triangular Corrugated Coaxial Cavity for Megawatt-Class Gyrotron

Analysis of a Triangular Corrugated Coaxial Cavity for Megawatt-Class Gyrotron

Influence of reflections on the operation of the 2 MW, CW 170 GHz coaxial cavity gyrotron for ITER

Magnetic Field Sensitivity in Depressed Collector for a Millimeter-Wave Gyrotron

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