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84 results on '"Noke, F."'

3. Short-pulse frequency stabilization of a MW-class ECRH gyrotron at W7-X for CTS diagnostic

Author

W7-X Team, Krier, L., Avramidis, K. A., Braune, H., Gantenbein, G., Illy, S., Jelonnek, J., Laqua, H. P., Marsen, S., Moseev, D., Noke, F., Ruess, T., Stange, T., Thumm, M., and Wolf, R. C.

Subjects
Technology, ddc:600
Abstract

At the Wendelstein 7-X stellarator, a 174 GHz Collective Thomson Scattering (CTS) diagnostic will be implemented. One of the 140 GHz Electron Cyclotron Resonance Heating (ECRH) gyrotrons will be operated at around 174 GHz in a higher cavity mode, using it as source for the CTS mm-wave probing beam. To prevent any damage to the CTS receiver, a notch filter cuts out the high-power gyrotron signal at the entrance of the receiver. The bandwidth of the gyrotron signal determines the notch filter bandwidth. First proof-of-principle experiments on frequency stabilization were conducted on W7-X ECRH gyrotrons employing Phase-Locked Loop techniques. The gyrotron output frequency was controlled with the accelerating voltage, which is applied between the anode and cathode of the gyrotron diode-type Magnetron Injection Gun. Frequency stabilization experiments with 10 ms pulses were conducted at the gyrotron nominal frequency of 140 GHz as well as at 174 GHz. It is concluded that the gyrotron frequency could be stabilized for at least 3 ms at 140 GHz and 8 ms at 174 GHz. In the frequency spectrum, a clear main peak of the gyrotron frequency at 140 GHz with a full -15 dB linewidth of below 500 Hz was achieved.

Published
2023
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4. MISTRAL campaign in support of W7-X long pulse operation

Author

Oosterbeek, J., Stern, M., Braune, H., Ewert, K., Hirsch, M., https://orcid.org/0000-0002-7120-6087, Hollmann, F., Killinger, A., Laqua, H., Maquet, P., Marsen, S., Martinez-Garcia, V., Moseev, D., https://orcid.org/0000-0001-7955-8565, Noke, F., Pak, S., Reintrog, A., Stange, T., https://orcid.org/0000-0003-4154-1455, Wolf, R., https://orcid.org/0000-0002-2606-5289, Zubieta-Lupo, R., and W7-X Team, Max Planck Institute for Plasma Physics, Max Planck Society

Published
2023

5. Concurrent operation of 10 gyrotrons at W7-X experience and improvement opportunities

Author

Braune H., Brunner K.J., Laqua H.P., Marsen S., Moseev D., Noke F., Purps F., Schneider N., Schulz T., Stange T., Uhren P., and Wilde F.

Subjects
Physics, QC1-999
Abstract

At the stellarator Wendelstein 7-X (W7-X) Electron Cyclotron Resonance Heating (ECRH) is the main heating system for steady-state operation and was the only available heating system during the operation phase OP1.2a in 2017. The ECRH, equipped with 10 operational 140 GHz gyrotrons [1], was used for different tasks at W7-X such as wall conditioning, controlled plasma start-up from the neutral gas up to steady state plasma control and different heating scenarios such as X2-mode and O2-mode heating as well as current drive (ECCD). The operational experiences and improvement opportunities of the ECRH plant will be discussed.

Published
2018
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6. Frequency Stabilization of Megawatt-Class 140 GHz Gyrotrons at W7-X Using an Off-the-Shelf PLL System

Author

Krier, L., primary, Avramidis, K. A., additional, Braune, H., additional, Gantenbein, G., additional, Illy, S., additional, Ioannidis, Z., additional, Jelonnek, J., additional, Laqua, H. P., additional, Marsen, S., additional, Moseev, D., additional, Noke, F., additional, Pagonakis, I. Gr., additional, Ruess, T., additional, Rzesnicki, T., additional, Stange, T., additional, Thumm, M., additional, and Wolf, R. C., additional

Published
2021
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8. Diplexers for power combination and switching in high power ECRH systems

Author

Bruschi, A., Erckmann, V., Kasparek, W., Petelin, M.I., Thumm, M., Bin, W., Cirant, S., D'Arcangelo, O., Hollmann, F., Lubyako, L., Noke, F., Plaum, B., Purps, F., and Zohm, H.

Subjects
Antennas (Electronics) -- Design and construction, Cyclotron -- Usage, Phase modulation -- Analysis, Business, Chemistry, Electronics, Electronics and electrical industries
Published
2010

10. Spectra of highly ionized xenon (6–30 nm) excited in W7-AS plasmas

Author

Hacker, H.H., Burhenn, R., Kondo, K., Anton, M., Assmus, D., Baeumel, S., Beidler, C., Bindemann, T., Brakel, R., Cattanei, G., Dinklage, A., Dodhy, A., Dorst, D., Ehmler, H., Elsner, A., Endler, M., Engelhardt, K., Erckmann, V., Feng, Y., Fuchs, C., Gadelmeier, F., Geiger, J., Giannone, L., Grigull, P., Gruenwald, G., Grulke, O., Harmeyer, E., Hartfuss, H.J., Herrnegger, F., Hirsch, M., Hofner, J., Hollmann, F., Holzhauer, E., Igitkhanov, Y., Jaenicke, R., Karger, F., Kick, M., Kisslinger, J., Klose, S., Knauer, J., Kroiss, H., Kühner, G., Kus, A., Laqua, H., Liu, R., Maassberg, H., Marushchenko, N., McCormick, K., Michel, G., Noke, F., Ott, W., Otte, M., Pacco-Duechs, M.G., Penningsfeld, F.P., Polunovsky, E., Probst, F., Purps, F., Ruhs, N., Rust, N., Saffert, N.J., Salat, A., Sallander, J., Sardei, F., Schneider, F., Schubert, M., Sidorenko, I., Speth, E., Suess, R., Thomsen, H., Volpe, F., Wagner, F., Weller, A., Wendland, C., Werner, A., Wobig, H., Wuersching, E., and Zimmermann, D.

Published
2001
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12. Nuclear Fusion (FUSION): Plasma Heating Systems -Microwave Plasma Heating & Current Drive System

Author

Gantenbein, Gerd, Avramidis, K., Franck, J., Fuchs, M., Illy, S., Ioannidis, Z., Jelonnek, J., Jin, J., Kalaria, P., Kobarg, Th., Lang, R., Leonhardt, W., Marschall, M., Mellein, D., Meier, A., Pagonakis, I., Papenfuß, A., Ruess, S., Ruess, T., Rzesnicki, T., Scherer, Theo A., Schmid, M., Strauss, D., M. Thumm, M., Wadle, S., Weggen, J., Wu, Ch., Zein, A., Kasparek, W., Lechte, C., Munk, R., Plaum, B., Remppel, F., Röhlinger, H., Roth, B., Schlüter, K. H., Wolf, S., Zeitler, A., Berndt, B., Braune, H., Hollmann, F., Jonitz, L., Laqua, H., Marsen, S., Noke, F., Preynas, M., Purps, F., Reintrog, A., Schulz, T., Stange, T., Uhren, P., Weißgerber, M., and Wilde, F.

Subjects
Technology, ddc:600
Published
2019

13. Commissioning of inline ECE system within waveguide based ECRH transmission systems on ASDEX upgrade

Author

Donné A.J.H., Amerongen F.J., de Baar M.R., Meo F., van den Brand H., van den Braber R., Doelman N., Kasparek W., Bongers W.A., Elzendoorn B.S.Q., Erckmann V., Goede A.P.H., Giannone L., Grünwald G., Hollman F., Kaas G., Krijger B., Michel G., Lubyako L., Monaco F., Noke F., Petelin M., Plaum B., Purps F., ten Pierik J.G.W, Schüller C., Slob J.W., Stober J.K., Schütz H., Wagner D., Westerhof E., and Ronden D.M.S.

Subjects
Physics, QC1-999
Abstract

A CW capable inline electron cyclotron emission (ECE) separation system for feedback control, featuring oversized corrugated waveguides, is commissioned on ASDEX upgrade (AUG). The system is based on a combination of a polarization independent, non-resonant, Mach-Zehnder diplexer equipped with dielectric plate beam splitters [2, 3] employed as corrugated oversized waveguide filter, and a resonant Fast Directional Switch, FADIS [4, 5, 6, 7] as ECE/ECCD separation system. This paper presents an overview of the system, the low power characterisation tests and first high power commissioning on AUG.

Published
2012
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14. Status of Resonant Diplexer Development for high-power ECRH Applications

Author

Bongers W., Fritz E., Doelman N., van den Braber R., Wagner D., Stober J., Schütz H., Schubert M, Purps F., Noke F., Müller S., Monaco F., Michel G., Maraschek M., Hollmann F., Grünwald G., Erckmann V., Filipovic E., Lechte C., Plaum B., Kasparek W., Krijger B., Petelin M., Lubyako L., Bruschi A., and Sakamoto K.

Subjects
Physics, QC1-999
Abstract

Characteristics of ring resonator diplexers for high-power ECRH are briefly reviewed. Commissioning experiments performed on ASDEX Upgrade with the diplexer Mk IIa are presented, which demonstrate slow and fast switching of the power between two launchers, and thus the capability for efficient suppression of neoclassical tearing modes and simultaneous central heating of the plasma. The development of the compact diplexer Mk IIIb is discussed, and test results are presented. Finally, an evacuated design for 170 GHz is shown.

Published
2012
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15. Controlled Mirror Motion System for Resonant Diplexers in ECRH Applications

Author

Monaco F., Maraschek M., de Baar M., Purps F., Noke F., Michel G., Hollmann F., Klop W., Dekker B., Fritz E., Stober J., Krijger B., Bongers W., Erckmann V., Kasparek W., van den Braber R., Doelman N., Müller S., Schütz H., and Wagner D.

Subjects
Physics, QC1-999
Abstract

High-power resonant diplexers for millimetre waves have various promising applications in ECRH systems. The round-trip resonator length of a diplexer needs to be accurately tuned to match its prescribed functionality. For this purpose one of the mirrors in the FADIS MkIIa diplexer has been mounted on a motion system, in order to control the mirror to its desired location despite the presence of substantial disturbances. The mechanical properties and control strategy for the mirror motion system have been designed such as to meet the overall system requirements. The performance of the motion system has been experimentally validated in various high power mm-wave tests.

Published
2012
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16. Nuclear Fusion (FUSION): Plasma Heating Systems – Microwave Plasma Heating & Current Drive Systems

Author

Avramidis, K., Franck, J., Fuchs, M., Gantenbein, G., Illy, S., Ioannidis, Z., Jelonnek, J., Jin, J., Kobarg, Th., Lang, R., Leonhardt, W., Losert, M., Mellein, D., Meier, A., Pagonakis, I., Papenfuß, A., Parth, K., Ruess, S., Rzesnicki, T., Scherer, Theo A., Schmid, M., Spiess, W., Strauss, D., Thumm, M., Wadle, S., Weggen, J., Wu, Ch., Zein, A., Zhang, J., Kasparek, W., Lechte, C., Munk, R., Plaum, B., Remppel, F., Röhlinger, H., Roth, B., Schlüter, K. H., Wolf, S., Zeitler, A., Berndt, B., Braune, H., Hollmann, F., Jonitz, L., Laqua, H., Marsen, S., Noke, F., Preynas, M., Purps, F., Reintrog, A., Schulz, T., Stange, T., Uhren, P., Weißgerber, M., and Wilde, F.

Subjects
Technology, ddc:600
Published
2018
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18. ECRH at W7-X - Concurrent Operation of 10 Gyrotrons

Author

Braune, H., primary, Brunner, K.J., additional, Laqua, H. P., additional, Marsen, S., additional, Moseev, D., additional, Noke, F., additional, Purps, F., additional, Schneider, N., additional, Schulz, T., additional, Stange, T., additional, Uhren, P., additional, and Wilde, F., additional

Published
2018
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20. Controlled Mirror Motion System for Resonant Diplexers in ECRH Applications

Author

Doelman, N.J., Van den Braber, R., Kasparek, W., Erckmann, V., Bongers, W.A., Krijger, B., Stober, J., Fritz, E., Dekker, B., Klop, W., Hollmann, F., Michel, G., Noke, F., Purps, F., de Baar, M.R., Maraschek, M., Monaco, F., Müller, S., Schütz, H., Wagner, D., Team, ASDEXUpgrade, and institutes, otherteams at the contributing

Subjects
Engineering, OM - Opto-Mechatronics, TS - Technical Sciences, Industrial Innovation, business.industry, Physics, QC1-999, Mechatronics, Mechanics & Materials, Power (physics), System requirements, Resonator, Electronic engineering, Millimeter, Electronics, business, Diplexer, Motion system
Abstract

High-power resonant diplexers for millimetre waves have various promising applications in ECRH systems. The round-trip resonator length of a diplexer needs to be accurately tuned to match its prescribed functionality. For this purpose one of the mirrors in the FADIS MkIIa diplexer has been mounted on a motion system, in order to control the mirror to its desired location despite the presence of substantial disturbances. The mechanical properties and control strategy for the mirror motion system have been designed such as to meet the overall system requirements. The performance of the motion system has been experimentally validated in various high power mm-wave tests. © Owned by the authors, published by EDP Sciences, 2012.

Published
2012

22. Commissioning of inline ECE system within waveguide based ECRH transmission systems on ASDEX upgrade

Author

Bongers, W. A., Kasparek, W., Doelman, N., van den Braber, R., van den Brand, H., Meo, Fernando, de Baar, M. R., Amerongen, F. J., Donne, A. J. H., Elzendoorn, B. S. Q., Erckmann, V., Goede, A. P. H., Giannone, L., Grünwald, G., Hollman, F., Kaas, G., Krijger, B., Michel, G., Lubyako, L., Monaco, F., Noke, F., Petelin, M., Plaum, B., Purps, F., ten Pierik, J. G. W., Schüller, C., Slob, J. W., Stober, J. K., Schütz, H., Wagner, D., Westerhof, E., and Ronden, D. M. S.

Abstract

A CW capable inline electron cyclotron emission (ECE) separation system for feedback control, featuring oversized corrugated waveguides, is commissioned on ASDEX upgrade (AUG). The system is based on a combination of a polarization independent, non-resonant, Mach-Zehnder diplexer equipped with dielectric plate beam splitters [2, 3] employed as corrugated oversized waveguide filter, and a resonant Fast Directional Switch, FADIS [4, 5, 6, 7] as ECE/ECCD separation system. This paper presents an overview of the system, the low power characterisation tests and first high power commissioning on AUG.

Published
2012

23. Commissioning of inline ECE system within waveguide based ECRH transmission systems on ASDEX upgrade

Author

Bongers, W.A., Kasparek, W., Doelman, N.J., Van den Braber, R., van den Brand, H., Meo, F., de Baar, M.R., Amerongen, F.J., Donne, A.J. H., Elzendoorn, B.S. Q., Erckmann, V., Goede, A.P. H., Giannone, L., Grünwald, G., Hollmann, F., Kaas, G., Krijger, B., Michel, G., Lubyako, L., Monaco, F., Noke, F., Petelin, M., Plaum, B., Purps, F., Pierik, J.G. W. ten, Schuller, C., Slob, J.W., Stober, J.K., Schütz, H., Wagner, D., Westerhof, E., Ronden, D.M. S., institutes, teamsat the contributing, and Team, ASDEXUpgrade

Subjects
Engineering, Waveguide filter, OM - Opto-Mechatronics, TS - Technical Sciences, Industrial Innovation, business.industry, Physics, QC1-999, Cyclotron, Electrical engineering, Transmission system, Mechatronics, Mechanics & Materials, law.invention, Optics, ASDEX Upgrade, law, Electronics, business, Diplexer, Waveguide, Beam splitter
Abstract

A CW capable inline electron cyclotron emission (ECE) separation system for feedback control, featuring oversized corrugated waveguides, is commissioned on ASDEX upgrade (AUG). The system is based on a combination of a polarization independent, non-resonant, Mach-Zehnder diplexer equipped with dielectric plate beam splitters [2, 3] employed as corrugated oversized waveguide filter, and a resonant Fast Directional Switch, FADIS [4, 5, 6, 7] as ECE/ECCD separation system. This paper presents an overview of the system, the low power characterisation tests and first high power commissioning on AUG. © Owned by the authors, published by EDP Sciences, 2012.

Published
2012

24. Status of Resonant Diplexer Development for high-power ECRH Applications

Author

Kasparek, W., Plaum, B., Lechte, C., Filipovic, E., Erckmann, V., Grünwald, G., Hollmann, F., Maraschek, M., Michel, G., Monaco, F., Müller, S., Noke, F., Purps, F., Schubert, M., Schütz, H., Stober, J., Wagner, D., Van den Braber, R., Doelman, N.J., Fritz, E., Bongers, W.A., Krijger, B., Petelin, M., Lubyako, L., Bruschi, A., Sakamoto, K., Team, ASDEXUpgrade, and institutes, otherteams at the contributing

Subjects
Engineering, TS - Technical Sciences, Industrial Innovation, business.industry, Physics, QC1-999, NI - Nano Instrumentation, Electrical engineering, Plasma, Fast switching, Power (physics), Resonator, ASDEX Upgrade, Physics & Electronics, Sustainable Chemical Industry, ____, Optoelectronics, Nanotechnology, Diplexer, business
Abstract

Characteristics of ring resonator diplexers for high-power ECRH are briefly reviewed. Commissioning experiments performed on ASDEX Upgrade with the diplexer Mk IIa are presented, which demonstrate slow and fast switching of the power between two launchers, and thus the capability for efficient suppression of neoclassical tearing modes and simultaneous central heating of the plasma. The development of the compact diplexer Mk IIIb is discussed, and test results are presented. Finally, an evacuated design for 170 GHz is shown. © Owned by the authors, published by EDP Sciences, 2012.

Published
2012

25. DEVELOPMENT OF COMPACT RESONANT DIPLEXERS FOR ECRH: DESIGN, RECENT RESULTS, AND PLANS

Author

Kasparek W., Erckmann V., Hollmann F., Michel G., Noke F., Purps F., Plaum B., Brand P., Lechte C., Filipovi E., Saliba M., Wang Y., Petelin M., Koposova E., Lubyako L., Doelman N., van de Braber R., Bruschi A., Bongers W., Thoen D.J., Stober J., Wagner D., groups at IPF Stuttgart, IPP Greifswald, IAP N. Novgorod, IFP Milano, KIT Karlsruhe, TNO Delft, and FOM Rijnhuizen

Subjects
Physics, Development (topology), ____, Electronic engineering, Diplexer
Abstract

____

Published
2011

26. Controlled High-Power Microwave Diplexers

Author

Kasparek W., van den Braber R., Doelman N., Fritz E., Erckmann V., Hollmann F., Michel G., Noke F., Purps F., Bongers W., Krijger B., Eminoglou E., Petelin M., Lubyako L., Bruschi A., Stober J., Wagner D., Plaum B., Filipovic E., Saliba M., and teams at the contributing institutes

Subjects
____
Abstract

___

Published
2011

27. High-Power Performance of a Resonant Diplexer for Advanced ECRH

Author

Kasparek, W [ 1 ], Van den Braber, R [ 2 ], Doelman, N [ 2 ], Fritz, E [ 2 ], Erckmann, V [ 3 ], Hollmann, F [ 3 ], Michel, G [ 3 ], Noke, F [ 3 ], Purps, F [ 3 ], Bongers, W [ 4 ], Krijger, B [ 4 ], Petelin, M [ 5 ], Lubyako, L [ 5 ], Bruschi, A [ 6 ], ECRH Groups at IPP Greifswald, and IPF Stuttgart

Subjects
high-power diplexers, electron cyclotron heating, Physics::Plasma Physics, power combination
Abstract

Electron cyclotron resonance heating (ECRH) systems for next-step large fusion devices operate in continuous wave power in the multimegawatt range. The unique feature of narrow and well-localized power deposition assigns a key role to ECRH for different tasks, such as plasma start-up, electron heating, current drive, magnetohydrodynamic (MHD) control and profile shaping. The integration of high-power microwave diplexers in the transmission lines will improve the flexibility and efficiency while simultaneously reducing the complexity of large ECRH systems. They can serve as power or beam combiners, as slow and fast directional switches to toggle the power from continuously operating gyrotrons between two launchers, and as discriminators of low-power electron cyclotron emission (ECE) signals from high-power ECRH using a common transmission line and antenna. Among various design options a resonant diplexer with a narrow resonance was selected for application at ASDEX Upgrade. The design is driven by the specific physics requirements for MHD control experiments and possible use for line-of-sight ECE. The compact, waveguide-compatible design features a feedback-controlled mirror drive for tracking of the resonator to the gyrotron frequency. High-power, long-pulse tests were performed with the 140-GHz ECRH system for the stellarator W7-X. Results on the transmission characteristics, power combination, and stationary and controlled distribution of the input power to two outputs are presented. The qualification for in-line ECE was investigated.

Published
2011

30. High-power microwave diplexers for advanced ECRH systems

Author

Kasparek W., Petelin M., Shchegolkov D., Erckmann V., Bruschi A., Braune H., Hollmann F., Jonitz L., Michel G., Laqua H.P., Noke F., Purps F., Brand P., Plaum B., Wubie W., Koshurinov Y., Lubyako L., Bin W., and D'Arcangelo O.

Subjects
____
Abstract

Combination of the power of two (or more) gyrotrons is an attractive feature for large ECRH systems, e.g. for ITER. Fast switching of the power from continuously operating gyrotrons between two antennas synchronous to the rotation of the magnetic islands in tokamaks maximizes the efficiency for stabilization of neoclassical tearing modes. Both tasks can be fulfilled with a high-power four-port diplexer, utilizing small frequency differences or small frequency-shift keying (some tens of MHz, by modulation of a supply voltage) of the gyrotrons. In the paper, high-power diplexer designs for quasi-optical and corrugated waveguide transmission systems including numerical and experimental results are discussed. In more detail, the principle and the design of a quasi-optical resonator diplexer is presented. Low-power measurements at 140 GHz of switching contrast, mode purity and efficiency are shown to agree well with theory. Results from high-power experiments on fast switching and power combination of two gyrotrons using the ECRH system for the stellarator W7-X are presented. Near-term plans for high-power experiments at ASDEX Upgrade and FTU are described (Note that there are also plans for in-line ECE on ASDEX Upgrade). Finally, applications of diplexers for the ECRH system on ITER assuming conventional gyrotrons are discussed, and future possibilities offered by phase-controlled gyrotrons like multibeam combining and switching are highlighted.

Published
2008

32. High-Power Tests of a Remote-Steering Antenna at 140 GHz

Author

Plaum, B., Gantenbein, G., Kasparek, W., Schworer, K., Grunert, M., Braune, H., Erckmann, V., Hollmann, F., Jonitz, L., Laqua, H., Michel, G., Noke, F., Purps, F., Bruschi, A., Cirant, S., Gandini, F., Verhoeven, A.G. A., and ECRH Groups

Published
2006

34. Integrated commissioning of ECRH for W7-X

Author

Braune, H., primary, Erckmann, V., additional, Jonitz, L., additional, Kasparek, W., additional, Laqua, H.P., additional, Michel, G., additional, Noke, F., additional, Purps, F., additional, Schulz, T., additional, and Uhren, P., additional

Published
2013
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35. Progress on 140 GHz, 1 MW, CW series gyrotrons for W7-X

Author

Jelonnek, J., primary, Braune, H., additional, Dammertz, G., additional, Erckmann, V., additional, Flamm, J., additional, Gantenbein, G., additional, Hollmann, F., additional, Jonitz, L., additional, Kasparek, W., additional, Kern, S., additional, Laqua, H. P., additional, Lechte, C., additional, Legrand, F., additional, Leonhardt, W., additional, Lietaer, G., additional, Michel, G., additional, Noke, F., additional, Purps, F., additional, Samartsev, A., additional, Schlaich, A., additional, Schmid, M., additional, Thumm, M., additional, and Uhren, P., additional

Published
2012
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37. Status of 1 MW, 140 GHz series gyrotrons for W7-X

Author

Gantenbein, G., primary, Braune, H., additional, Dammertz, G., additional, Erckmann, V., additional, Illy, S., additional, Kern, S., additional, Kasparek, W., additional, Lechte, C., additional, Leonhardt, W., additional, Lievin, C., additional, Michel, G., additional, Noke, F., additional, Purps, F., additional, Samartsev, A., additional, Schlaich, A., additional, Schmid, M., additional, and Thumm, M., additional

Published
2011
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38. A new CW-load for high power ECRH systems

Author

Braune, H., primary, Erckmann, V., additional, Hollmann, F., additional, Kasparek, W., additional, Noke, F., additional, Purps, F., additional, Schulz, T., additional, and Wagner, D., additional

Published
2011
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42. Extended operation of the 1 MW, CW gyrotrons for W7-X

Author

Braune, H., primary, Brand, P., additional, Dammertz, G., additional, Erckmann, V., additional, Gantenbein, G., additional, Kasparek, W., additional, Laqua, H.P., additional, Lechte, C., additional, Leonhardt, W., additional, Mellein, D., additional, Michel, G., additional, Noke, F., additional, Purps, F., additional, Schluter, K.-H., additional, Schmid, M., additional, and Thumm, M., additional

Published
2007
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43. The electron cyclotron heating system for the stellarator W7-X: Status and recent achievements

Author

Kasparek, W., primary, Brand, P., additional, Braune, H., additional, Dammertz, G., additional, Erckmann, V., additional, Gantenbein, G., additional, Hollmann, F., additional, Jonitz, L., additional, Kumric, H., additional, Laqua, H.P., additional, Lechte, C., additional, Leonhardt, W., additional, Michel, G., additional, Noke, F., additional, Plaum, B., additional, Purps, F., additional, Schmid, M., additional, Schulz, T., additional, Thumm, M., additional, Uhren, P., additional, and Weissgerber, M., additional

Published
2007
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44. High-Power Experiments with 140 GHz Series Gyrotrons for W7-X

Author

Gantenbein, G., primary, Braune, H., additional, Dammertz, G., additional, Alberti, S., additional, Erckmann, V., additional, Hogge, J.P., additional, Illy, S., additional, Kasparek, W., additional, Laqua, H. P., additional, Legrand, F., additional, Leonhardt, W., additional, Lievin, C., additional, Michel, G., additional, Neffe, G., additional, Noke, F., additional, Piosczyk, B., additional, Purps, F., additional, Schmid, M., additional, Thumm, M., additional, and Tran, M.Q., additional

Published
2007
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45. Status of the 140GHz, 10MW CW transmission system for ECRH on the stellarator W7-X

Author

Kasparek, W., primary, Brand, P., additional, Braune, H., additional, Dammertz, G., additional, Erckmann, V., additional, Gantenbein, G., additional, Hollmann, F., additional, Grünert, M., additional, Kumric, H., additional, Jonitz, L., additional, Laqua, H.P., additional, Leonhardt, W., additional, Michel, G., additional, Noke, F., additional, Plaum, B., additional, Purps, F., additional, Schmid, M., additional, Schulz, T., additional, Schwörer, K., additional, Thumm, M., additional, and Weissgerber, M., additional

Published
2005
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46. High-power tests of a remote steering launcher mock-up at 140 GHz

Author

Plaum, B, primary, Gantenbein, G, additional, Kasparek, W, additional, Schwörer, K, additional, Grünert, M, additional, Braune, H, additional, Erckmann, V, additional, Hollmann, F, additional, Jonitz, L, additional, Laqua, H, additional, Michel, G, additional, Noke, F, additional, Purps, F, additional, Bruschi, A, additional, Cirant, S, additional, Gandini, F, additional, Verhoeven, A G A, additional, Greifswald, ECRH group at IPP, additional, Karlsruhe, ECRH group at FZK, additional, and Stuttgart, ECRH group at IPF, additional

Published
2005
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47. High-Power Performance of a Resonant Diplexer for Advanced ECRH

Author

Kasparek, W., Van Den Braber, R., Doelman, N., Fritz, E., Erckmann, V., Hollmann, F., Michel, G., Noke, F., Purps, F., Bongers, W., Krijger, B., Petelin, M., Lubyako, L., and Bruschi, A.

Abstract

AbstractElectron cyclotron resonance heating (ECRH) systems for next-step large fusion devices operate in continuous wave power in the multimegawatt range. The unique feature of narrow and well-localized power deposition assigns a key role to ECRH for different tasks, such as plasma start-up, electron heating, current drive, magnetohydrodynamic (MHD) control and profile shaping. The integration of high-power microwave diplexers in the transmission lines will improve the flexibility and efficiency while simultaneously reducing the complexity of large ECRH systems. They can serve as power or beam combiners, as slow and fast directional switches to toggle the power from continuously operating gyrotrons between two launchers, and as discriminators of low-power electron cyclotron emission (ECE) signals from high-power ECRH using a common transmission line and antenna. Among various design options a resonant diplexer with a narrow resonance was selected for application at ASDEX Upgrade. The design is driven by the specific physics requirements for MHD control experiments and possible use for line-of-sight ECE. The compact, waveguide-compatible design features a feedback-controlled mirror drive for tracking of the resonator to the gyrotron frequency. High-power, long-pulse tests were performed with the 140-GHz ECRH system for the stellarator W7-X. Results on the transmission characteristics, power combination, and stationary and controlled distribution of the input power to two outputs are presented. The qualification for in-line ECE was investigated.

Published
2011
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49. First high-power tests of the 140 GHz, 10 MW CW transmission system for ECRH on the stellarator W7-X

Author

Kasparek, W., primary, Dammertz, G., additional, Erckmann, V., additional, Gantenbein, G., additional, Grunert, M., additional, Hollmann, F., additional, Jonitz, L., additional, Laqua, H.P., additional, Michel, G., additional, Noke, F., additional, Plaum, B., additional, Purps, F., additional, Schultz, T., additional, Schworer, K., additional, and Weissgerber, M., additional

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