First Experimental Results from the European Union 2-MW Coaxial Cavity ITER Gyrotron Prototype

Hogge, J.‐P.; Goodman, T.P.; Alberti, S.; Albajar, F.; Avramides, K.A.; Benin, P.; Bethuys, S.; Bin, W.; Bonicelli, T.; Bruschi, A.; Cirant, S.; Droz, E.; Dumbrājs, O.; Fasel, D.; Gandini, F.; Gantenbein, G.; Illy, S.; Jawla, Sudheer; Jin, Jianbo; Kern, Stefan; Lavanchy, P.; Lievin, C.; Marlétaz, B.; Marmillod, P.; Pérez, A.; Piosczyk, B.; Pagonakis, Ioannis Gr.; Porte, L.; Rzesnickl, T.; Siravo, U.; Thumm, M.; Tran, M.Q.

doi:10.13182/fst09-a4072

Cited by 66 publications

(26 citation statements)

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“…This point is very important for the remaining of the paper since it ensures that the interaction dynamics is dominated by longitudinal mode competition and not by transverse mode competition as it is the case for high-power gyrotrons designed for heating of magnetically confined fusion plasmas and operating on very high-order modes for minimizing the ohmic losses. 20 …”

Section: B Cold Cavity Propertiesmentioning

confidence: 99%

Experimental study from linear to chaotic regimes on a terahertz-frequency gyrotron oscillator

et al. 2012

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Basic wave-particle interaction dynamics from linear to chaotic regimes is experimentally studied on a frequency tunable gyrotron generating THz radiation in continuous mode (200 W) at 263 GHz which will be used for dynamic nuclear polarization nuclear magnetic resonance spectroscopy applications. In the studied system, the nonlinear dynamics associated to the waveparticle interaction is dominated by longitudinal mode competition of a given transverse TE m;p cavity-mode. This study covers a wide range of control parameter from gyro-traveling wave tube (gyro-TWT) to gyro-backward wave oscillator (gyro-BWO) like interactions for which extensive theoretical studies have been performed in the past on a simplified system. Besides the common route to chaos characterized by period doubling, other routes have been identified among which some are characterized by line-width frequency-broadening on the side-bands. The complex nonlinear dynamics is in good agreement with the theory and the experimental results are discussed on the basis of the prediction obtained with the nonlinear time-dependent selfconsistent codes TWANG and EURIDICE both based on a slow-time scale formulation of the self-consistent equations governing the wave-particle dynamics. V C 2012 American Institute of Physics. [http://dx

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Section: B Cold Cavity Propertiesmentioning

confidence: 99%

Experimental study from linear to chaotic regimes on a terahertz-frequency gyrotron oscillator

et al. 2012

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“…The gyrotrons [7][8][9][10][11][12] are designed to generate 1 MW or more at the window output with an electrical efficiency of ≥50% and ≥95% coupling to the HE 11 mode at the MOU (Matching Optic Unit). The gyrotron procurement includes a liquid helium free cryomagnet, MOU, cooling manifold, local control system, support structure, auxiliary power supplies and ancillary systems.…”

Section: Gyrotronsmentioning

confidence: 99%

Overview of the ITER EC H&CD system and its capabilities

Omori

Henderson

Albajar

et al. 2011

Fusion Engineering and Design

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The Electron Cyclotron (EC) system for the ITER tokamak is designed to inject ≥20 MW RF power into the plasma for Heating and Current Drive (H&CD) applications. The EC system consists of up to 26 gyrotrons (between 1 to 2 MW each), the associated power supplies, 24 transmission lines and 5 launchers. The EC system has a diverse range of applications including central heating and current drive, current profile tailoring and control of plasma magneto-hydrodynamic (MHD) instabilities such as the sawtooth and neoclassical tearing modes (NTMs). This diverse range of applications requires the launchers to be capable of depositing the EC power across nearly the entire plasma cross section. This is achieved by two types of antennas: an equatorial port launcher (capable of injecting up to 20 MW from the plasma axis to mid-radius) and four upper port launchers providing access from inside of mid radius to near the plasma edge. The equatorial launcher design is optimized for central heating, current drive and profile tailoring, while the upper launcher should provide a very focused and peaked current density profile to control the plasma instabilities.The overall EC system has been modified during the past three years taking into account the issues identified in the ITER design review from 2007 and 2008 as well as integrating new technologies. This paper will review the principal objectives of the EC system, modifications made during the past two years and how the design is compliant with the principal objectives.

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“…It will generate 24 MW of mm-wave power at 170 GHz. Europe will provide for this purpose gyrotrons for a total of 8 MW generated power, which are under development through the European Gyrotron Consortium (EGYC), with Thales Electron Devices (TED), Velizy, France as industrial partner [1]. The original plan targeted four 2 MW coaxial cavity gyrotrons, to be developed using a modular short pulse pre-prototype at KIT and a series of three industrial CW prototypes, aiming at pulse lengths of 1 s, 60 s and one hour, respectively.…”

Section: Introductionmentioning

confidence: 99%

Experimental results and recent developments on the EU 2 MW 170 GHz coaxial cavity gyrotron for ITER

Kern

Hogge

Alberti

et al. 2012

EPJ Web of Conferences

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Abstract. The European Gyrotron Consortium (EGYC) is responsible for developing one set of 170 GHz mm-wave sources, in support of Europe's contribution to ITER. The original plan of targeting a 2 MW coaxial gyrotron is currently under discussion, in view of essential delays and damages. This paper reports on the latest results and plans with regard to the two 2 MW gyrotron prototypes, the industrial prototype at CRPP's CW test stand and a modular pre-prototype at KIT. The industrial prototype was delivered to CRPP end of September 2011 and reached an output power of 2 MW at an efficiency of 45 % and with good RF beam pattern, in only four days of short pulse RF test. These results validated all design changes made in reaction to the results of the experiments in 2008. On the fifth experimental day, an internal absorber broke, terminating any further experiment with this tube. In parallel, design and experimental activities at KIT went on, in particular featuring reduced stray radiation down to 4% of the RF power. Next years' plans for the 2 MW modular pre-prototype foresee a stepwise increase of pulse length.

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First Experimental Results from the European Union 2-MW Coaxial Cavity ITER Gyrotron Prototype

Cited by 66 publications

References 4 publications

Experimental study from linear to chaotic regimes on a terahertz-frequency gyrotron oscillator

Experimental study from linear to chaotic regimes on a terahertz-frequency gyrotron oscillator

Overview of the ITER EC H&CD system and its capabilities

Experimental results and recent developments on the EU 2 MW 170 GHz coaxial cavity gyrotron for ITER

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