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111 results on '"Weissgerber, M."'

8. HIGH-POWER MILLIMETREWAVE TRANSMISSION SYSTEMS AND COMPONENTS FOR ELECTRON CYCLOTRON HEATING OF FUSION PLASMAS

Author

W7-X ECRH Teams IPP Greifswald, IPF Stuttgart, FZK Karlsruhe, ECRH team ASDEX IPP Garching, Kasparek, W., Dammertz, G., Erckmann, V., Gantenbein, G., Grünert, M., Holzhauer, E., Kumric, H., Laqua, H.P., Leuterer, F., Michel, G., Plaum, B., Schwörer, K., Wagner, D., Wacker, R., Weissgerber, M., Garching, Hirshfield, Jay L., editor, and Petelin, Michael I., editor

Published
2005
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11. Remote-Steering Antennas for 140 GHz Electron Cyclotron Heating of the Stellarator W7-X

Author

Lechte C., Kasparek W., Plaum B., Zeitler A., Erckmann V., Laqua H., Schneider N., Weissgerber M., Bechtold A., Busch M., and Szepaniak B.

Subjects
Physics, QC1-999
Abstract

For electron cyclotron resonance heating of the stellarator W7-X at IPP Greifswald, a 140 GHz/10 MW cw millimeter wave system has been built. Two out of 12 launchers will employ a remote-steering design. This paper describes the overall design of the two launchers, and design issues like input coupling structures, manufacturing of corrugated waveguides, optimization of the steering range, integration of vacuum windows, mitrebends and vacuum valves into the launchers, as well as low power tests of the finished waveguides.

Published
2017
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13. ECRH and ECCD with high power gyrotrons at the stellarators W7-AS and W7-X

Author

Erckmann, V., Dammertz, Gunter, Dorst, D., Empacher, L., Forster, W., Gantenbein, G., Geist, T., Kasparek, W., Laqua, H.P., Muller, G.A., Thumm, Manfred, Weissgerber, M., and Wobig, H.

Subjects
Electron accelerators -- Research, Cyclotron -- Research, Millimeter waves -- Research, Cyclotron resonance -- Research, Microwave tubes -- Research, Business, Chemistry, Electronics, Electronics and electrical industries
Abstract

Electron cyclotron resonance heating (ECRH) plays a key role in stellarator research, because it provides net current free plasma start up and heating toward reactor relevant plasma parameters. ECRH was extensively used and investigated in the stellarator experiments at IPP Garching, i.e., the W7-A and the W7-AS stellarators. These experiments provide a solid physics and technological basis for the 10 MW, CW ECRH system, which is under construction for the superconducting next step stellarator W7-X and will become operational in 2005. We briefly describe some of the major stellarator specific physics results on ECRH and electron cyclotron (EC)-current drive from W7A and W7-AS. The scientific goals and the design of W7-X are outlined together with the demands for the ECRH system, which is the main heating system in the first stage of the experiment. The present status of the ECRH engineering design including the gyrotrons, all auxiliary systems, the transmission line, and the launching system are presented. Index Terms - Current drive, electron cyclotron resonance heating, gyrotron, magnetic confinement fusion, millimeter waves, stellarator.

Published
1999

16. Remote-Steering Launchers for the ECRH system on the Stellarator W7-X

Author

Kasparek W., Lechte C., Plaum B., Zeitler A., Erckmann V., Laqua H.P., Weißgerber M., Bechtold A., Busch M., and Szcepaniak B.

Subjects
Physics, QC1-999
Abstract

For electron cyclotron resonance heating of the stellarator W7-X at IPP Greifswald, a 140 GHz/10 MW cw millimeter wave system is in construction. Two out of 12 launchers will employ a remote-steering design. This paper describes the overall design of the two launchers, and design issues like input coupling structures, manufacturing of corrugated waveguides, optimization of the steering range, integration of vacuum windows, mitrebends and vacuum valves into the launchers, as well as tests of prototype parts.

Published
2015
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17. IN-VESSEL CRYO PUMP FOR ASDEX UPGRADE DIVERTOR II

Author

Streibl, B., primary, Deschka, S., additional, Gruber, O., additional, Jüttner, B., additional, Lang, P., additional, Mattes, K., additional, Pautasso, G., additional, Perchermeier, J., additional, Schippl, K., additional, Schneider, H., additional, Seidel, U., additional, Suttrop, W., additional, Teller, G., additional, and Weissgerber, M., additional

Published
1997
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19. 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

20. Large Scale CW ECRH Systems: Some considerations

Author

Turkin Y., Michel G., Marushchenko N. B., Lubiako L., Laqua H. P., Gantenbein G., Braune H., Petelin M.I., Lechte C., Plaum B., Kasparek W., Erckmann V., and Weissgerber M.

Subjects
Physics, QC1-999
Abstract

Electron Cyclotron Resonance Heating (ECRH) is a key component in the heating arsenal for the next step fusion devices like W7-X and ITER. These devices are equipped with superconducting coils and are designed to operate steady state. ECRH must thus operate in CW-mode with a large flexibility to comply with various physics demands such as plasma start-up, heating and current drive, as well as configurationand MHD - control. The request for many different sophisticated applications results in a growing complexity, which is in conflict with the request for high availability, reliability, and maintainability. ‘Advanced’ ECRH-systems must, therefore, comply with both the complex physics demands and operational robustness and reliability. The W7-X ECRH system is the first CW- facility of an ITER relevant size and is used as a test bed for advanced components. Proposals for future developments are presented together with improvements of gyrotrons, transmission components and launchers.

Published
2012
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21. Collective Thomson scattering diagnostic at Wendelstein 7-X

Author

Moseev, D., Stejner, M., Stange, T., Abramovic, I., Laqua, H.P., Marsen, S., Schneider, N., Braune, H., Hoefel, U., Kasparek, W., Korsholm, S.B., Lechte, C., Leipold, F., Nielsen, S.K., Salewski, M., Rasmussen, J., Weißgerber, M., Wolf, R.C., Moseev, D., Stejner, M., Stange, T., Abramovic, I., Laqua, H.P., Marsen, S., Schneider, N., Braune, H., Hoefel, U., Kasparek, W., Korsholm, S.B., Lechte, C., Leipold, F., Nielsen, S.K., Salewski, M., Rasmussen, J., Weißgerber, M., and Wolf, R.C.

Abstract

A Collective Thomson Scattering (CTS) diagnostic is installed at Wendelstein 7-X for ion temperature measurements in the plasma core. The diagnostic utilizes 140 GHz gyrotrons usually used for electron cyclotron resonance heating (ECRH) as a source of probing radiation. The CTS diagnostic uses a quasi-optical transmission line covering a distance of over 40 m. The transmission line is shared between the ECRH system and the CTS diagnostic. Here we elaborate on the design, installation, and alignment of the CTS diagnostic and present the first measurements at Wendelstein 7-X.

Published
2019

24. 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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25. Collective Thomson scattering diagnostic at Wendelstein 7-X

Author

Moseev, D., primary, Stejner, M., additional, Stange, T., additional, Abramovic, I., additional, Laqua, H. P., additional, Marsen, S., additional, Schneider, N., additional, Braune, H., additional, Hoefel, U., additional, Kasparek, W., additional, Korsholm, S. B., additional, Lechte, C., additional, Leipold, F., additional, Nielsen, S. K., additional, Salewski, M., additional, Rasmussen, J., additional, Weißgerber, M., additional, and Wolf, R. C., additional

Published
2019
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26. Optics for electron cyclotron resonance heating and collective Thomson scattering at the stellarator W7-X

Author

Kasparek, W., Erckmann, V., Laqua, H. P., Stange, T., Weissgerber, M., Lechte, C., Plaum, B., Moseev, D., Leipold, Frank, Petelin, M., Brunner, K. J., Braune, H., Marsen, S., Schneider, N., Wolf, R. C., Team, W7-X, Kasparek, W., Erckmann, V., Laqua, H. P., Stange, T., Weissgerber, M., Lechte, C., Plaum, B., Moseev, D., Leipold, Frank, Petelin, M., Brunner, K. J., Braune, H., Marsen, S., Schneider, N., Wolf, R. C., and Team, W7-X

Abstract

This paper will provide a brief review on the optical transmission system, describe its performance and first experiences, and will concentrate on new developments like in-vessel grating reflectors, Remote-steering (RS) antennas used as launchers and receivers for ECRH and collective Thomson scattering (CTS) , as well as possible upgrades.

Published
2017

31. Physics, technologies, and status of the Wendelstein 7-X device

Author

Wagner, F., Andreeva, T., Cardella, A., Czerwinski, M., Damiani, C., Dammertz, G., Duebner, A., Ehmler, J. H., Elio, F., Endler, M., Erckmann, V., Feist, J., Baldzuhn, J., Fillunger, M., Gantenbein, G., Gardebrecht, W., Gasparotto, M., Giesen, B., Greuner, H., Greve, A. B., Grigull, P., Grote, H., Harmeyer, E., Benndorf, A., Hartfuss, H. J., Hartmann, D., Hein, B., Heinemann, B., Holtum, D., Huguet, M., Hurd, F., Jaksic, N., Kasparek, W., Kissliner, J., Bolt, H., Klinger, T., Knauer, J., Krampitz, R., Laqua, H., Lentz, H., Liesenberg, K., Maier, J., Maix, R., Mendelevitch, B., Michel, G., Boscary, J., Nagel, H. Y., Naujoks, D., Niedermeyer, H., Nuehrenberg, C., Opitz, A., Pfeiffer, G., Pietsch, M., Reich, J., Risse, K., Rong, P., Bosch, H. S., Rummel, K., Rummel, T., Sborchia, C., Schauer, F., Schroeder, R., Schultz, U., Schweizer, S., Simon-Weidner, J., Sochor, M., Sonnerup, L., Braeuer, T., Streibl, B., Tretter, J., Thumm, M., Viebke, H., Wanner, M., Wegener, L., Weissgerber, M., Werner, A., Winkler, M., Brakel, R., and Brand, P.

Published
2004

32. Technical challenges in the construction of the steady-state stellarator Wendelstein 7-X

Author

Bosch, H.-S., primary, Wolf, R.C., additional, Andreeva, T., additional, Baldzuhn, J., additional, Birus, D., additional, Bluhm, T., additional, Bräuer, T., additional, Braune, H., additional, Bykov, V., additional, Cardella, A., additional, Durodié, F., additional, Endler, M., additional, Erckmann, V., additional, Gantenbein, G., additional, Hartmann, D., additional, Hathiramani, D., additional, Heimann, P., additional, Heinemann, B., additional, Hennig, C., additional, Hirsch, M., additional, Holtum, D., additional, Jagielski, J., additional, Jelonnek, J., additional, Kasparek, W., additional, Klinger, T., additional, König, R., additional, Kornejew, P., additional, Kroiss, H., additional, Krom, J.G., additional, Kühner, G., additional, Laqua, H., additional, Laqua, H.P., additional, Lechte, C., additional, Lewerentz, M., additional, Maier, J., additional, McNeely, P., additional, Messiaen, A., additional, Michel, G., additional, Ongena, J., additional, Peacock, A., additional, Pedersen, T.S., additional, Riedl, R., additional, Riemann, H., additional, Rong, P., additional, Rust, N., additional, Schacht, J., additional, Schauer, F., additional, Schroeder, R., additional, Schweer, B., additional, Spring, A., additional, Stäbler, A., additional, Thumm, M., additional, Turkin, Y., additional, Wegener, L., additional, Werner, A., additional, Zhang, D., additional, Zilker, M., additional, Akijama, T., additional, Alzbutas, R., additional, Ascasibar, E., additional, Balden, M., additional, Banduch, M., additional, Baylard, Ch., additional, Behr, W., additional, Beidler, C., additional, Benndorf, A., additional, Bergmann, T., additional, Biedermann, C., additional, Bieg, B., additional, Biel, W., additional, Borchardt, M., additional, Borowitz, G., additional, Borsuk, V., additional, Bozhenkov, S., additional, Brakel, R., additional, Brand, H., additional, Brown, T., additional, Brucker, B., additional, Burhenn, R., additional, Buscher, K.-P., additional, Caldwell-Nichols, C., additional, Cappa, A., additional, Carls, A., additional, Carvalho, P., additional, Ciupiński, Ł., additional, Cole, M., additional, Collienne, J., additional, Czarnecka, A., additional, Czymek, G., additional, Dammertz, G., additional, Dhard, C.P., additional, Davydenko, V.I., additional, Dinklage, A., additional, Drevlak, M., additional, Drotziger, S., additional, Dudek, A., additional, Dumortier, P., additional, Dundulis, G., additional, Eeten, P.v., additional, Egorov, K., additional, Estrada, T., additional, Faugel, H., additional, Fellinger, J., additional, Feng, Y., additional, Fernandes, H., additional, Fietz, W.H., additional, Figacz, W., additional, Fischer, F., additional, Fontdecaba, J., additional, Freund, A., additional, Funaba, T., additional, Fünfgelder, H., additional, Galkowski, A., additional, Gates, D., additional, Giannone, L., additional, García Regaña, J.M., additional, Geiger, J., additional, Geißler, S., additional, Greuner, H., additional, Grahl, M., additional, Groß, S., additional, Grosman, A., additional, Grote, H., additional, Grulke, O., additional, Haas, M., additional, Haiduk, L., additional, Hartfuß, H.-J., additional, Harris, J.H., additional, Haus, D., additional, Hein, B., additional, Heitzenroeder, P., additional, Helander, P., additional, Heller, R., additional, Hidalgo, C., additional, Hildebrandt, D., additional, Höhnle, H., additional, Holtz, A., additional, Holzhauer, E., additional, Holzthüm, R., additional, Huber, A., additional, Hunger, H., additional, Hurd, F., additional, Ihrke, M., additional, Illy, S., additional, Ivanov, A., additional, Jablonski, S., additional, Jaksic, N., additional, Jakubowski, M., additional, Jaspers, R., additional, Jensen, H., additional, Jenzsch, H., additional, Kacmarczyk, J., additional, Kaliatk, T., additional, Kallmeyer, J., additional, Kamionka, U., additional, Karaleviciu, R., additional, Kern, S., additional, Keunecke, M., additional, Kleiber, R., additional, Knauer, J., additional, Koch, R., additional, Kocsis, G., additional, Könies, A., additional, Köppen, M., additional, Koslowski, R., additional, Koshurinov, J., additional, Krämer-Flecken, A., additional, Krampitz, R., additional, Kravtsov, Y., additional, Krychowiak, M., additional, Krzesinski, G., additional, Ksiazek, I., additional, Kubkowska, M., additional, Kus, A., additional, Langish, S., additional, Laube, R., additional, Laux, M., additional, Lazerson, S., additional, Lennartz, M., additional, Li, C., additional, Lietzow, R., additional, Lohs, A., additional, Lorenz, A., additional, Louche, F., additional, Lubyako, L., additional, Lumsdaine, A., additional, Lyssoivan, A., additional, Maaßberg, H., additional, Marek, P., additional, Martens, C., additional, Marushchenko, N., additional, Mayer, M., additional, Mendelevitch, B., additional, Mertens, Ph., additional, Mikkelsen, D., additional, Mishchenko, A., additional, Missal, B., additional, Mizuuchi, T., additional, Modrow, H., additional, Mönnich, T., additional, Morizaki, T., additional, Murakami, S., additional, Musielok, F., additional, Nagel, M., additional, Naujoks, D., additional, Neilson, H., additional, Neubauer, O., additional, Neuner, U., additional, Nocentini, R., additional, Noterdaeme, J.-M., additional, Nührenberg, C., additional, Obermayer, S., additional, Offermanns, G., additional, Oosterbeek, H., additional, Otte, M., additional, Panin, A., additional, Pap, M., additional, Paquay, S., additional, Pasch, E., additional, Peng, X., additional, Petrov, S., additional, Pilopp, D., additional, Pirsch, H., additional, Plaum, B., additional, Pompon, F., additional, Povilaitis, M., additional, Preinhaelter, J., additional, Prinz, O., additional, Purps, F., additional, Rajna, T., additional, Récsei, S., additional, Reiman, A., additional, Reiter, D., additional, Remmel, J., additional, Renard, S., additional, Rhode, V., additional, Riemann, J., additional, Rimkevicius, S., additional, Riße, K., additional, Rodatos, A., additional, Rodin, I., additional, Romé, M., additional, Roscher, H.-J., additional, Rummel, K., additional, Rummel, Th., additional, Runov, A., additional, Ryc, L., additional, Sachtleben, J., additional, Samartsev, A., additional, Sanchez, M., additional, Sano, F., additional, Scarabosio, A., additional, Schmid, M., additional, Schmitz, H., additional, Schmitz, O., additional, Schneider, M., additional, Schneider, W., additional, Scheibl, L., additional, Scholz, M., additional, Schröder, G., additional, Schröder, M., additional, Schruff, J., additional, Schumacher, H., additional, Shikhovtsev, I.V., additional, Shoji, M., additional, Siegl, G., additional, Skodzik, J., additional, Smirnow, M., additional, Speth, E., additional, Spong, D.A., additional, Stadler, R., additional, Sulek, Z., additional, Szabó, V., additional, Szabolics, T., additional, Szetefi, T., additional, Szökefalvi-Nagy, Z., additional, Tereshchenko, A., additional, Thomsen, H., additional, Timmermann, D., additional, Tittes, H., additional, Toi, K., additional, Tournianski, M., additional, Toussaint, U.v., additional, Tretter, J., additional, Tulipán, S., additional, Turba, P., additional, Uhlemann, R., additional, Urban, J., additional, Urbonavicius, E., additional, Urlings, P., additional, Valet, S., additional, Van Eester, D., additional, Van Schoor, M., additional, Vervier, M., additional, Viebke, H., additional, Vilbrandt, R., additional, Vrancken, M., additional, Wauters, T., additional, Weissgerber, M., additional, Weiß, E., additional, Weller, A., additional, Wendorf, J., additional, Wenzel, U., additional, Windisch, T., additional, Winkler, E., additional, Winkler, M., additional, Wolowski, J., additional, Wolters, J., additional, Wrochna, G., additional, Xanthopoulos, P., additional, Yamada, H., additional, Yokoyama, M., additional, Zacharias, D., additional, Zajac, J., additional, Zangl, G., additional, Zarnstorff, M., additional, Zeplien, H., additional, Zoletnik, S., additional, and Zuin, M., additional

Published
2013
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36. Progress in the 10-MW 140-GHz ECH System for the Stellarator W7-X

Author

Thumm, M., primary, Brand, P., additional, Braune, H., additional, Dammertz, G., additional, Erckmann, V., additional, Gantenbein, G., additional, Illy, S., additional, Kasparek, W., additional, Laqua, H.P., additional, Lechte, C., additional, Leonhardt, W., additional, Michel, G., additional, Neffe, G., additional, Piosczyk, B., additional, Schmid, M., additional, and Weissgerber, M., additional

Published
2008
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37. 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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38. Progress on the 10 MW, 140 GHz ECH System for the Stellarator W7-X

Author

Thumm, M., primary, Dammertz, G., additional, Gantenbein, G., additional, Illy, S., additional, Leonhardt, W., additional, Neffe, G., additional, Piosczyk, B., additional, Schmid, M., additional, Braune, H., additional, Erckmann, V., additional, Laqua, H.P., additional, Michel, G., additional, Weissgerber, M., additional, Brand, P., additional, Kasparek, W., additional, and Lechte, C., additional

Published
2007
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39. ECRH AND W7-X: AN INTRIGUING PAIR.

Author

Erckmann, V., Braune, H., Gantenbein, G., Jelonnek, J., Kasparek, W., Laqua, H. P., Lechte, C., Marushchenko, N. B., Michel, G., Plaum, B., Thumm, M., Weissgerber, M., and Wolf, R.

Subjects
ELECTRON cyclotron resonance heating, HIGH-frequency heating, PLASMA confinement, PLASMA confinement devices, PLASMA devices, CONTROLLED fusion
Abstract

The construction of the W7-X basic machine is almost completed and the device is approaching the commissioning phase. W7-X operation will be supported by ECRH working at 140 GHz in 2nd harmonic X- or O-mode with 10 MW cw power. Presently the activities at W7-X concentrate on the implementation of wall-armour, in-vessel components and diagnostics. The ECRH-system is in stand by with 5 out of 10 gyrotrons operational. The status of both, the W7-X device and the ECRH system is reported. Further R&D activities concentrate on extending the launching capability for sophisticated confinement investigations with remote steering launchers in a poloidal plane with weak magnetic field gradient. [ABSTRACT FROM AUTHOR]

Published
2014
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40. 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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41. Large Scale CW ECRH Systems: Some considerations.

Author

Erckmann, V., Kasparek, W., Plaum, B., Lechte, C., Petelin, M. I., Braune, H., Gantenbein, G., Laqua, H. P., Lubiako, L., Marushchenko, N. B., Michel, G., Turkin, Y., and Weissgerber, M.

Subjects
ELECTRON cyclotron resonance sources, SUPERCONDUCTIVITY, PLASMA gases, GYROTRONS, RELIABILITY in engineering
Abstract

Electron Cyclotron Resonance Heating (ECRH) is a key component in the heating arsenal for the next step fusion devices like W7-X and ITER. These devices are equipped with superconducting coils and are designed to operate steady state. ECRH must thus operate in CW-mode with a large flexibility to comply with various physics demands such as plasma start-up, heating and current drive, as well as configurationand MHD - control. The request for many different sophisticated applications results in a growing complexity, which is in conflict with the request for high availability, reliability, and maintainability. 'Advanced' ECRH-systems must, therefore, comply with both the complex physics demands and operational robustness and reliability. The W7-X ECRH system is the first CW- facility of an ITER relevant size and is used as a test bed for advanced components. Proposals for future developments are presented together with improvements of gyrotrons, transmission components and launchers. [ABSTRACT FROM AUTHOR]

Published
2012
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42. Electron Cyclotron Resonance Heating for W7-X.

Author

Michel, G., Brand, P., Braune, H., Erckmann, V., Gantenbein, G., Kasparek, W., Laqua, H. P., Marushchenko, N., Oosterbeek, J. W., Thumm, M., and Weißgerber, M.

Subjects
ELECTRON cyclotron resonance sources, ELECTRONS, CYCLOTRONS, HEATING, QUANTUM electrodynamics
Abstract

The HELIAS-type Stellarator Wendelstein 7-X, which is currently under construction in Greifswald, Germany, will be equipped with a 140 GHz, 10 MW, CW ECRH system. It will be the main plasma heating system for W7-X. The key features and capabilities of the ECRH plant will be discussed together with the envisaged start-up and heating scenarios. We also report on the ECRH stray radiation test facility MISTRAL and on the extension of the gyrotron frequency range. [ABSTRACT FROM AUTHOR]

Published
2009
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43. THE 10 MW, CW, ECRH-PLANT FOR W7-X: STATUS AND HIGH POWER PERFORMANCE.

Author

ERCKMANN, V., BRAUNE, H., LAQUA, H. P., MARUSHCHENKO, N. B., MICHEL, G., TURKIN, Y., WEISSGERBER, M., GANTENBEIN, G., THUMM, M., BRAND, P., KASPAREK, W., and LECHTE, C.

Subjects
POWER density, ENERGY density, PLASMA gases, PLASMA physics, FUSION reactors
Published
2009

44. The W7-X ECRH Plant: Recent Achievements.

Author

Erckmann, V., Brand, P., Braune, H., Dammertz, G., Gantenbein, G., Kasparek, W., Laqua, H. P., Michel, G., Schmid, M., Thumm, M., and Weissgerber, M.

Subjects
ELECTRIC power, RADIO frequency, ELECTRIC currents, ELECTRIC power distribution, ELECTRICITY
Abstract

The 10 MW, 140 GHz, CW ECRH-plant for W7-X is in an advanced state of commissioning and the installation was used to investigate advanced applications for extended heating- and current drive scenarios. The operation of the TED gyrotrons was recently extended to a 2nd frequency of 103.6 GHz at reduced output power and first results are presented. An improved collector sweep system for the W7-X gyrotrons with enhanced power capability and smooth power distribution was developed, results are reported. [ABSTRACT FROM AUTHOR]

Published
2007
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49. Electron Cyclotron Heating for W7-X: Physics and Technology

Author

Erckmann, V., Brand, P., Braune, H., Dammertz, G., Gantenbein, G., Kasparek, W., Laqua, H. P., Maassberg, H., Marushchenko, N. B., Michel, G., Thumm, M., Turkin, Y., Weissgerber, M., and Weller, A.

Abstract

The Wendelstein 7X (W7-X) stellarator (R= 5.5 m, a= 0.55 m, B< 3.0 T), which at present is being built at Max-Planck-Institut für Plasmaphysik, Greifswald, aims at demonstrating the inherent steady-state capability of stellarators at reactor-relevant plasma parameters. A 10-MW electron cyclotron resonance heating (ECRH) plant with continuous-wave (cw) capability is under construction to meet the scientific objectives. The physics background of the different heating and current drive scenarios is presented. The expected plasma parameters are calculated for different transport assumptions. A newly developed ray-tracing code is used to calculate selected reference scenarios and optimize the electron cyclotron launcher and in-vessel structure. Examples are discussed, and the technological solutions for optimum wave coupling are presented. The ECRH plant consists of ten radio-frequency (rf) modules with 1 MW of power each at 140 GHz. The rf beams are transmitted to the W7-X torus (typically 60 m) via two open multibeam mirror lines with a power-handling capability, which would already satisfy the ITER requirements (24 MW). Integrated full-power, cw tests of two rf modules (gyrotrons and the related transmission line sections) are reported, and the key features of the gyrotron and transmission line technology are presented. As the physics and technology of ECRH for both W7-X and ITER have many similarities, test results from the W7-X ECRH may provide valuable input for the ITER-ECRH plant.

Published
2007
Full Text
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50. Electron cyclotron heating for W7-X: Physics and technology

Author

Erckmann, V., Brand, P., Braune, H., Dammertz, G., Gantenbein, G., Kasparek, W., Laqua, H. P., Maassberg, H., Nikolai Marushchenko, Michel, G., Thumm, M., Turkin, Y., Weissgerber, M., Weller, A., W7-X ECRH Team, and IPF Stuttgart

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