Linear theory of an electron cyclotron maser operating at the fundamental

Kreischer, K.E.; Temkin, Richard J.

doi:10.1007/bf01007116

Cited by 46 publications

(13 citation statements)

References 12 publications

(17 reference statements)

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“…As a result, the high efficiency region was accessible and single mode emission was possible. Note that the measured starting current was 0.2 A, which agrees with a prediction of 0.26 A based on linear theory (Kreischer and Temkin 1980). Unfortunately, a comparison of the peak efficiencies shown in Figs.…”

Section: Resultssupporting

confidence: 62%

High efficiency operation of a 140 GHz pulsed gyrotron

Kreischer

Schutkeker

Danly

et al. 1984

International Journal of Electronics

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The operating characteristics of a 140 GHz, pulsed gyrotron are reported. Total efficiencies of 36% and ouput powers of 175 kW have been obtained in single mode operation.Measurements of power and efficiency have been made for a variety of modes between 120 and 160 GHz, and these results are in good agreement with predictions based on nonlinear theory. The best results have been obtained with isolated, asymmetric modes, such as the TE 4 , 2 , 1 (127.3 GHz), TE 2 , 3 , 1 (136.7 GHz),and the TE 3 , 3 , 1 (155.6 GHz). Although mode competition was found to prevent the TEO, 3 , 1 mode (139.5 GHz) from reaching the optimum operating conditions, an output power of 138 kW and total efficiency of 29% were achieved with this mode. A variety of new, highly accurate diagnostic techniques that have been developed to measure the power, frequency, and mode content of the output radiation will be reviewed. In addition, the operating characteristics of both laminar and nonlaminar magnetron injection guns will be compared. The high powers and efficiencies obtained in this experiment are promising for the extension of gyrotron output powers to the megawatt range.2

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Section: Resultssupporting

confidence: 62%

High efficiency operation of a 140 GHz pulsed gyrotron

Kreischer

Schutkeker

Danly

et al. 1984

International Journal of Electronics

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“…Using linear theory (Kreischer and Temkin 1980), an expression can be derived for the percentage change in operating frequency Aw/w that occurs when the resonator of 0.089 at xmn, which is in good agreement with the exact value of 0.072 that is obtained from Fig.(6). Unfortunately, these values are substantially higher than those observed experimentally.…”

Section: Theorysupporting

confidence: 70%

Frequency pulling and bandwidth measurements of a 140 GHz pulsed gyrotron

Kreischer

Danly

Woskoboinikow

et al. 1984

International Journal of Electronics

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Accurate measurements of the emission frequency and bandwidth of a pulsed 140GHz gyrotron have been made using a harmonic mixer system. This system has been used to measure the bandwidth of individual, 1 Asec pulses of the gyrotron, to determine the dependence of the operating frequency on the cathode voltage and resonator magnetic field, to detect and identify second harmonic radiation, and to study multimode operation.Bandwidths as low as 3 MHz, which is the instrumental limit, have been observed. In addition, frequency pulling has been measured and compared with predictions based on linear and self-consistent nonlinear theory. It was found that linear theory is inadequate for describing the frequency characteristics of a gyrotron operating well above the starting current, while self-consistent nonlinear theory was in reasonable agreement with the experimental results. The small bandwidths and stable operating frequencies that were measured confirm the viability of the gyrotron as a millimeter and submillimeter source for plasma diagnostics.2

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“…The starting current can be calculated in a linearized single-mode theory. 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].…”

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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Linear theory of an electron cyclotron maser operating at the fundamental

Cited by 46 publications

References 12 publications

High efficiency operation of a 140 GHz pulsed gyrotron

High efficiency operation of a 140 GHz pulsed gyrotron

Frequency pulling and bandwidth measurements of a 140 GHz pulsed gyrotron

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

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