Towards a 2 MW, CW, 170 GHz coaxial cavity gyrotron for ITER

Piosczyk, B.; Arnold, A.; Budig, H.; Dammertz, G.; Dumbrājs, O.; Drumm, O.; Kartikeyan, M. V.; Kuntze, M.; Thumm, M.; Yang, Xiaoxia

doi:10.1016/s0920-3796(03)00078-4

Cited by 43 publications

(14 citation statements)

References 3 publications

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“…0 from Eq. (12). This is consistent with the intuition that for an ideal system without noise, stabilization, which is equivalent to shifting of the unstable poles into the stable half of the complex frequency domain, requires no energy.…”

Section: Solution Under Optimal Feedbacksupporting

confidence: 87%

“…(13) clearly depends on the state feedback law of Eq. (12) and requires knowledge of the states a. Experimentally, this information is often not available, specifically in the case of multiple MHD modes. One cannot make direct measurements of the helical plasma displacement and sometimes can make only crude estimates.…”

Section: Design Of a State Observer (Kalman Filter)mentioning

confidence: 99%

“…12,13 The modulation of the ECH for feedback may be best achieved via modulating the anode voltage in a switching mode on/ off.…”

Section: Other Technical Issuesmentioning

confidence: 99%

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Feedback control of major disruptions in International Thermonuclear Experimental Reactor

Sen

2011

Physics of Plasmas

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It is argued that major disruptions in ITER can be avoided by the feedback control of the causative MHD precursors. The sensors will be 2D-arrays of ECE detectors and the suppressors will be modulated ECH beams injected radially to produce non-thermal radial pressures to counter the radial dynamics of MHD modes. The appropriate amplitude and phase of this signal can stabilize the relevant MHD modes and prevent their evolution to a major disruption. For multimode MHD precursors, an optimal feedback scheme with a Kalman filter is discussed.

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Section: Solution Under Optimal Feedbacksupporting

confidence: 87%

Section: Design Of a State Observer (Kalman Filter)mentioning

confidence: 99%

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Feedback control of major disruptions in International Thermonuclear Experimental Reactor

Sen

2011

Physics of Plasmas

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“…In order to attain these physics tasks, the ITER EC H&CD system consisted of twenty-four 170 GHz, 1 MW gyrotrons [4][5][6], the power supply system to operate the gyrotrons [7], twenty-four transmission lines with the length of 100-150 m [8,9] and one equatorial port and four upper port launchers [10][11][12] is required. These system components are provided by five domestic agencies (DAs), Japan, Europe, Russia, the US and India and installed in collaboration with the ITER Organization.…”

Section: Introductionmentioning

confidence: 99%

Progress of ITER equatorial electron cyclotron launcher design for physics optimization and toward final design

Takahashi¹,

Kajiwara²,

Okazaki³

et al. 2011

Fusion Engineering and Design

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“…Thus, the main efforts have been aimed at increasing the energy of the output radiation of the gyrotrons in the millimeter wave range, for example, International Thermonuclear Experimental Reactor (ITER) frequency of 170 GHz, 1 MW, continuous wave (CW) operation [3][4][5]. For microwave rage gyrotrons, such as 28 GHz gyrotron, the required output power did not exceed several hundreds of kilowatts recently.…”

Section: Introductionmentioning

confidence: 99%

High Efficiency Mode Converter for Low-Frequency Gyrotron

Minami

Kariya

Imai

et al. 2010

J Infrared Milli Terahz Waves

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A high efficiency quasi-optical (QO) mode converter for high-power, low-frequency gyrotron have been designed and tested. For low-frequency gyrotrons, the scales of the mode converter are comparatively small on the wavelength scale, thus causing significant diffraction losses. Over-1 MW power gyrotron with TE 8,3 cavity at 28 GHz have been developed, which has a high efficiency mode converter designed by the use of numerical methods for launcher optimization. This calculation is sufficiently optimized to maximize the fractional Gaussian content of the far field. The total transmission efficiency from the mode converter to output window is 94.7%. For the experimental result of first tube, the output power of more than 1 MW has been obtained with about 40% efficiency and output burn pattern agrees fairly with the calculated profiles, which imply the design appropriateness. Besides, the frequency dependence for diffraction loss is discussed, and these results give the guiding design principle of the mode converter for high-power, low-frequency and long-pulse gyrotrons.

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Towards a 2 MW, CW, 170 GHz coaxial cavity gyrotron for ITER

Cited by 43 publications

References 3 publications

Feedback control of major disruptions in International Thermonuclear Experimental Reactor

Feedback control of major disruptions in International Thermonuclear Experimental Reactor

Progress of ITER equatorial electron cyclotron launcher design for physics optimization and toward final design

High Efficiency Mode Converter for Low-Frequency Gyrotron

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