Use of weakly irregular waveguide theory to calculate eigenfrequencies, Q values, and RF field functions for gyrotron oscillators

Fliflet, A. W.; Read, Michael

doi:10.1080/00207218108901350

Cited by 85 publications

(23 citation statements)

References 3 publications

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“…The eigenfrequency and diffraction quality factor Q D,q of each axial mode were computed using a cold-cavity code [19] and the results are presented in Table I. 331.13 1670 From the calculated quality factors and the cold axial electric field profile, the start oscillation current for the operating and neighboring modes were computed using linear theory [20].…”

Section: Designmentioning

confidence: 99%

Operation of a Continuously Frequency-Tunable Second-Harmonic CW 330-GHz Gyrotron for Dynamic Nuclear Polarization

Torrezan

Shapiro

Sirigiri

et al. 2011

IEEE Trans. Electron Devices

159

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Abstract-The design and operation of a frequency tunable continuous-wave (CW) 330-GHz gyrotron oscillator operating at the second harmonic of the electron cyclotron frequency are reported. The gyrotron has generated 18 W of power from a 10.1-kV 190-mA electron beam working in a TE -4,3 cylindrical mode, corresponding to an efficiency of 0.9%. The measured start oscillation current over a range of magnetic field values is in good agreement with theoretical start currents obtained from linear theory for successive high order axial modes TE -4,3,q , where q = 1 to 6. Also, the observed frequency range in the start current measurement is in reasonable agreement with the frequency range calculated from numerical simulations. The minimum start oscillation current of the device was measured to be 33 mA. A continuous tuning range of 1.2 GHz was observed experimentally via a combination of magnetic, voltage, and thermal tuning. The gyrotron output power and frequency stabilities were assessed to be ±0.4% and ±3 ppm, respectively, during a 110-hour uninterrupted CW run. Evaluation of the gyrotron microwave output beam pattern using a pyroelectric camera indicated a Gaussian-like mode content of 92% with an ellipticity of 28%. The gyrotron will be used for 500-MHz nuclear magnetic resonance (NMR) experiments with sensitivity enhanced by dynamic nuclear polarization (DNP).Index Terms-Dynamic nuclear polarization (DNP), nuclear magnetic resonance (NMR), second cyclotron harmonic, submillimeter wave, terahertz, tunable gyrotron.

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Section: Designmentioning

confidence: 99%

Operation of a Continuously Frequency-Tunable Second-Harmonic CW 330-GHz Gyrotron for Dynamic Nuclear Polarization

Torrezan

Shapiro

Sirigiri

et al. 2011

IEEE Trans. Electron Devices

159

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“…This has been done in a number of ways by [1,[4][5][6][7], and will not be repeated here. The cold cavity computations are done following [1,[8][9][10]. Using these results self-consistent calculations can be carried out following [1,[10][11][12].…”

Section: Gds-v01mentioning

confidence: 99%

DESIGN OF A 60 GHz, 100 kW CW GYROTRON FOR PLASMA DIAGNOSTICS: GDS-V.01 SIMULATIONS

Jain¹,

Kartikeyan²

2010

PIER B

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Abstract-In this work, the design studies of a 60 GHz, 100 kW CW gyrotron have been presented. Mode selection is carefully studied with the aim of minimizing mode competition and to yield a perfect solid beam output through an RF window with a suitable dimpled-wall quasi-optical launcher. Cavity design and interaction computations are then carried out. In addition, preliminary design of the magnetron injection gun, magnetic guidance system, launcher, and RF window are presented. Thus, we present a feasibility study, which indicates that the operation of such a gyrotron is possible and can give a power in excess of 100 kW at an efficiency > 35%. As a part of this work, a complete Graphical User Interface package "GDS V.01" (Gyrotron Design Suit Ver.01) has been developed for the design and conceptualization of specific gyrotrons.

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“…The actual design of cavity is carried out using a modified version of the NRL cavity field solver code CAVRF [19]. After some iterations and adjustment of dimensions, a design is obtained.…”

Section: Design Of Experimentsmentioning

confidence: 99%

A gyrotron-powered standing-wave electromagnetic wiggler experiment

Chu

Danly

Temkin

1989

Nuclear Instruments and Methods in Physics Research Section A:

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Use of weakly irregular waveguide theory to calculate eigenfrequencies, Q values, and RF field functions for gyrotron oscillators

Cited by 85 publications

References 3 publications

Operation of a Continuously Frequency-Tunable Second-Harmonic CW 330-GHz Gyrotron for Dynamic Nuclear Polarization

Operation of a Continuously Frequency-Tunable Second-Harmonic CW 330-GHz Gyrotron for Dynamic Nuclear Polarization

DESIGN OF A 60 GHz, 100 kW CW GYROTRON FOR PLASMA DIAGNOSTICS: GDS-V.01 SIMULATIONS

A gyrotron-powered standing-wave electromagnetic wiggler experiment

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