Some opportunities to control and stabilize frequency of gyrotron

Fernandez, A.; Glyavin, M. Yu.; Martı́n, Rosario; Novozhilova, J.; Ofitserov, M. M.; Petelin, M. I.

doi:10.1109/ivec.2003.1286213

Cited by 8 publications

(5 citation statements)

References 1 publication

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“…Before trying frequency stabilization, we have carried out the measurement on the frequency shift in a steady state as a function of an acceleration voltage V a [6][7][8][9][10][11][12]. In Fig.…”

Section: Frequency Dependence On Acceleration Voltagementioning

confidence: 99%

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Stabilization of Gyrotron Frequency by PID Feedback Control on the Acceleration Voltage

Khutoryan

Idehara

Кулешов

et al. 2015

J Infrared Milli Terahz Waves

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The results of frequency stabilization by proportional-integral-derivative (PID) feedback control of acceleration voltage in the 460-GHz Gyrotron FU CW GVI (the official name in Osaka University is Gyrotron FU CW GOI) are presented. The experiment was organized on the basis of the frequency modulation by modulation of acceleration voltage of beam electrons. The frequency stabilization during 10 h experiment was better than 10 −6 , which is compared with the results of the frequency deviation in free-running gyrotron operation.

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Section: Frequency Dependence On Acceleration Voltagementioning

confidence: 99%

“…Therefore, the shift of the cyclotron frequency Δf c =−f c0 (ΔV a /511). However, the real frequency shift of gyrotron output is limited and decreased by the effect of frequency fixed effect of the resonant cavity [7][8][9][10][11][12]. A solid line in Fig.…”

Section: Frequency Dependence On Acceleration Voltagementioning

confidence: 99%

Stabilization of Gyrotron Frequency by PID Feedback Control on the Acceleration Voltage

Khutoryan

Idehara

Кулешов

et al. 2015

J Infrared Milli Terahz Waves

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“…The main mechanism of P(U a ) dependence is that anode voltage growth increases pitch factor [13][14][15] that leads to power increase [14]. But also beam quality can be deteriorated and even reflected electrons can appear.…”

Section: Power Stabilization By Use Of Anode Voltage Feedback At Consmentioning

confidence: 99%

Gyrotron Output Power Stabilization by PID Feedback Control of Heater Current and Anode Voltage

Khutoryan

Idehara

Кулешов

et al. 2014

J Infrared Milli Terahz Waves

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To provide stable output power of a gyrotron during long operation time the power stabilization was achieved by two schemes with PID feedback control of heater current and anode voltage. It was based on the dependence of the output power on both the anode voltage and the beam current and also on the dependence of the beam current on the gun heater current. Both schemes provided decrease of the power standard deviation to 0.3-0.5%. The comparison between parameters of both schemes is discussed in the paper.

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“…A fast frequency control of a free running single-mode gyrotron can be achieved only by changing an operation voltage: the change transforms electron beam parameters, including the reactive part of RF conductivity, and finally results in a frequency shift. In gyrotrons of the diode type, the total electron current goes through the HV modulator, and, consequently, A very precise frequency control can be realized, in particular, by connecting the gyrotron to a frequency synthesizer by a phase locking loop 14 . The method was verified by an experiment with a 13 GHz triode-type gyrotron 15 : the spectral bandwidth was reduced by a factor of 20.…”

Section: Options For Gyrotron Frequency Controlmentioning

confidence: 99%

Fast Switching and Power Combination of High-Power Electron Cyclotron Wave Beams: Principles, Numerical Results, and Experiments

Kasparek

Petelin

Erckmann

et al. 2007

Fusion Science and Technology

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Narrow-band frequency diplexers in connection with small frequency-shift keying of gyrotrons can be used to switch the millimeter wave power between two output channels or to combine the power from different sources. This technique can e.g. be used for fast beam steering for synchronous stabilization of rotating neoclassical tearing modes (NTMs) in tokamaks. Beam steering can be performed by a multi-stage multiplexer, provided that phase-controlled sources are available. In the paper, various concepts for fast directional switches as well as their integration into transmission lines are discussed. Calculations and low-power measurements of prototypes are presented. Requirements and techniques for frequency control of the gyrotrons are discussed, and the results of preliminary frequency modulation experiments are shown. Future prospects for the application of diplexers in large ECRH systems are discussed. A resonant diplexer experiment in the beam duct of the high-power ECRH system for W7-X is presently being prepared.

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Some opportunities to control and stabilize frequency of gyrotron

Cited by 8 publications

References 1 publication

Stabilization of Gyrotron Frequency by PID Feedback Control on the Acceleration Voltage

Stabilization of Gyrotron Frequency by PID Feedback Control on the Acceleration Voltage

Gyrotron Output Power Stabilization by PID Feedback Control of Heater Current and Anode Voltage

Fast Switching and Power Combination of High-Power Electron Cyclotron Wave Beams: Principles, Numerical Results, and Experiments

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