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101. Design criteria of the bolometer diagnostic for steady-state operation of the W7-X stellaratora

Author: Zhang, D., Burhenn, R., König, R., Giannone, L., Grodzki, P.A., Klein, B., Grosser, K., Baldzuhn, J., Ewert, K., Erckmann, V., Hirsch, M., Laqua, H.P., Oosterbeek, J.W., Zhang, D., Burhenn, R., König, R., Giannone, L., Grodzki, P.A., Klein, B., Grosser, K., Baldzuhn, J., Ewert, K., Erckmann, V., Hirsch, M., Laqua, H.P., and Oosterbeek, J.W.
Abstract: A bolometric diagnostic system with features necessary for steady-state operation in the superconducting stellarator W7-X was designed. During a pulse length of 1800 s with an ECRH (electron cyclotron resonance heating) power of 10 MW, the components suffer not only from a large thermal load but also from stray radiation of the nonabsorbed isotropic microwaves. This paper gives an overview of the technical problems encountered during the design work and the solutions to individual problems to meet the special requirements in W7-X, e.g., component thermal protection, detector offset thermal drift suppression, as well as a microwave shielding technique. © 2010 American Institute of Physics
Published: 2010

102. Diagnostics design for steady-state operation of the Wendelstein 7-X stellarator

Author: König, R., Baldzuhn, J., Biel, W. (Wolfgang), Biedermann, C., Burhenn, R., Bozhenkov, S., Cantarini, J., Dreier, H., Endler, M., Hartfuss, H.J., Hildebrandt, D., Hirsch, M., Jakubowski, M., Jimenez-Gomez, R., Kocsis, G., Kornejev, P., Krychowiak, M., Laqua, H.P., Laux, M., Oosterbeek, J.W., Pasch, E., Richert, T., Schneider, W., Schweer, B., Svensson, J., Thomsen, H., Weller, A., Werner, A., Wolf, R., Zhang, D., Zoletnik, S., König, R., Baldzuhn, J., Biel, W. (Wolfgang), Biedermann, C., Burhenn, R., Bozhenkov, S., Cantarini, J., Dreier, H., Endler, M., Hartfuss, H.J., Hildebrandt, D., Hirsch, M., Jakubowski, M., Jimenez-Gomez, R., Kocsis, G., Kornejev, P., Krychowiak, M., Laqua, H.P., Laux, M., Oosterbeek, J.W., Pasch, E., Richert, T., Schneider, W., Schweer, B., Svensson, J., Thomsen, H., Weller, A., Werner, A., Wolf, R., Zhang, D., and Zoletnik, S.
Abstract: The status of the diagnostic developments for the quasistationary operable stellarator Wendelstein 7-X (maximum pulse length of 30 min at 10 MW ECRH heating at 140 GHz) will be reported on. Significant emphasis is being given to the issue of ECRH stray radiation shielding of in-vessel diagnostic components, which will be critical at high density operation requiring O2 and OXB heating. © 2010 American Institute of Physics
Published: 2010

103. H-Mode Phenomenology in W7-AS Configurations Bounded by Magnetic Islands

Author: Grigull, P., Hirsch, M., McCormick, K., Baldzuhn, J., Brakel, R., Fiedler, S., Fuchs, C., Giannone, L., Hartfuss, H., Hildebrandt, D., Kißlinger, J., König, R., Kühner, G., Maaßberg, H., Wagner, F., and W7-AS, Max Planck Institute for Plasma Physics, Max Planck Society
Published: 1999

104. Spectroscopic Measurement of the Non-Thermal Electron-Root Feature in W7-AS

Author: Baldzuhn, J. and W7-AS-Team
Published: 1998

105. ELM-Like Transport Events and their Impact on Confinement in W7-AS

Author: Hirsch, M., Anton, M., Baldzuhn, J., Chatenet, J., Christou, C., Endler, M., Geiger, J., Geist, T., Hartfuss, H., Holzhauer, E., Kuehner, G., Stroth, U., Zoletnik, S., and W7-AS-Team
Published: 1998

106. 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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107. The Role of the Radial Electric Field and Plasma Rotation for the W7-AS Stellarator Confinement

Author: Baldzuhn, J., Burhenn, R., Heinrich, O., Wagner, F., Hofmann, J., Kick, M., Maassberg, H., Ohlendorf, W., and W7-AS-Team
Published: 1997

108. Dynamic Behaviour of the H-Mode Edge Transport Barrier in the W7-AS Stellarator

Author: Hirsch, M., Holzhauer, E., Baldzuhn, J., Brakel, R., Fiedler, S., Geist, T., Grigull, P., Hartfuss, H., Hofmann, J., Jaenicke, R., Koponen, J., Wagner, F., Weller, A., Wobig, H., and W7-AS-Team
Published: 1997

109. Feedback Controlled Radiative Edge Cooling Experiments in the Wendelstein 7-AS Stellarator

Author: Grigull, P., Brakel, R., Borrass, K., Baldzuhn, J., Elsner, A., Fiedler, S., Hacker, H., Hartfuss, H., Hildebrandt, D., Schneider, R., Stroth, U., Wagner, F., Weller, A., Zhang, D., W7-AS Team, and ECRH-Group
Published: 1997

110. The Neoclassical 'Electron-Root' Feature in W7-AS

Author: Maassberg, H., Baldzuhn, J., Beidler, C., Dyabilin, K., Erckmann, V., Gasparino, U., Marushchenko, N., Marukami, S., Nakajima, N., Rome, M., and W7-AS-Team
Published: 1997

111. High-Confinment NBI Discharges in W7-AS

Author: Stroth, U., Anton, M., Baldzuhn, J., Burhenn, R., Geiger, J., Geist, T., Giannone, L., Hartfuss, H., Hirsch, M., Jaenecke, R., Koponen, J., Kick, M., Kuehner, G., Penningsfeld, F., Wagner, F., and Weller, A.
Published: 1997

112. Role of Recycling to Achieve High nNtau(E) in W7-AS

Author: Heinrich, O., Maassberg, H., Baldzuhn, J., Fiedler, S., and W7-AS Team, Max Planck Institute for Plasma Physics, Max Planck Society
Published: 1997

113. Analysis of D Pellet Injection Experiments in the W7-AS Stellarator

Author: Lyon, J., Baylor, L., Baldzuhn, J., Fiedler, S., Hirsch, M., Kühner, G., and Weller, A.
Published: 1997

114. The Impact of Microwave Stray Radiation to In-Vessel Diagnostic Components.

Author: Hirsch, M., Laqua, H. P., Hathiramani, D., Oosterbeek, J., Baldzuhn, J., Biedermann, C., Brand, H. v. d., Cardella, A., Erckmann, V., Jimenez, R., König, R., Köppen, M., Parquay, S., and Zhang, D.
Subjects: MICROWAVES, ELECTRON cyclotron resonance heating, ISOTROPIC properties, RADIATION shielding, CERAMIC coating, COOLING, ABSORPTION, PLASMA gases
Abstract: Microwave stray radiation resulting from unabsorbed multiple reflected ECRH / ECCD beams may cause severe heating of microwave absorbing in-vessel components such as gaskets, bellows, windows, ceramics and cable insulations. In view of long-pulse operation of WENDELSTEIN-7X the Microwave STray RAdiation Launch facility, MISTRAL, allows to test in-vessel components in the environment of isotropic 140 GHz microwave radiation at power load of up to 50 kW/m2 over 30 min. The results show that both, sufficient microwave shielding measures and cooling of all components are mandatory. If shielding/cooling measures of in-vessel diagnostic components are not efficient enough, the level of stray radiation may be (locally) reduced by dedicated absorbing ceramic coatings on cooled structures. [ABSTRACT FROM AUTHOR]
Published: 2014
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115. Frequency Shift of Reflectometry Signals due to Rotation of Density Turbulence in W7-AS

Author: Branas, B., Gresillon, D., Hirsch, M., Sitenko, A., Baldzuhn, J., Zagorodny, A., Geist, T., Hartfuss, H., and European Physical Society, Geneva(CH)
Published: 1996

116. W7-AS Contributions to the 111th Topical Conference 'High-Teperatur Plasma Diagnostics' (12.-16.May. 1996 Monterey, Californien) W7-AS Contributions to the 12th International Conference on Plasma Surface Interacions (20.-24. May 1996, St.-Raphael, France) W7-AS Contribution s to the 23rd EPS Conference on Controlled Fusion and Plasma Physics (24.-28.June 1996, Kiev, Ukraine)

Author: Baldzuhn, J., Giannone, L., Hartfuss, H. J., Kühner, G., Feng, Y., Grigull, P., Herre, G., Sardei, F., Brakel, R., Branas, B., Cattanei, G., Fiedler, S., Geiger, J., Heinrich, O. P., Hofmann, J. V., Laqua, H. P., Maaßberg, H., Rome, M., and Bleuel, J.
Published: 1996

117. Diagnostics development for quasi-steady-state operation of the Wendelstein 7-X stellarator (invited)

Author: König, R., primary, Baldzuhn, J., additional, Biedermann, C., additional, Burhenn, R., additional, Bozhenkov, S., additional, Cardella, A., additional, Endler, M., additional, Hartfuss, H.-J., additional, Hathiramani, D., additional, Hildebrandt, D., additional, Hirsch, M., additional, Jakubowski, M., additional, Kocsis, G., additional, Kornejev, P., additional, Krychowiak, M., additional, Laqua, H. P., additional, Laux, M., additional, Oosterbeek, J. W., additional, Pasch, E., additional, Richert, T., additional, Schneider, W., additional, Sunn-Pedersen, T., additional, Thomsen, H., additional, Weller, A., additional, Werner, A., additional, Wolf, R., additional, Zhang, D., additional, and Zoletnik, S., additional
Published: 2012
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118. Paschen Problems in Large Coil Systems

Author: Lange, C., primary, Baldzuhn, J., additional, Fink, S., additional, Heller, R., additional, Hollik, M., additional, and Fietz, W. H., additional
Published: 2012
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119. Diagnostics Development for Steady State Operation of the Stellarator Wendelstein 7-X

Author: Burhenn, R., primary, Baldzuhn, J., additional, Biel, W., additional, Dreier, H., additional, Endler, M., additional, Jimenez-Gomez, R., additional, Grosser, K., additional, Hartfuss, H.J., additional, Hildebrandt, D., additional, Hirsch, M., additional, König, R., additional, Kornejew, P., additional, Krychowiak, M., additional, Laqua, H.P., additional, Laux, M., additional, Oosterbeek, J.W., additional, Pasch, E., additional, Schneider, W., additional, Thomsen, H., additional, Weller, A., additional, Werner, A., additional, Wolf, R., additional, and Zhang, D., additional
Published: 2011
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120. Characterization of turbulence in L- and ELM-free H-mode Wendelstein 7-AS plasmas

Author: Basse, N.P., Zoletnik, S., Antar, G.Y., Baldzuhn, J., Werner, A., Basse, N.P., Zoletnik, S., Antar, G.Y., Baldzuhn, J., and Werner, A.
Published: 2003

121. Zeff Measurement and Analysis of Reheat-Mode Discharges in W7-AS

Author: Morita, S. and Baldzuhn, J.
Published: 1994

122. W7-AS Contributions to the 11th Conference on Plasma Surface Interactions in controlled Dusion Devices, (Mito, Ibaraki, Japan, May 23.-27. 1994) W7-AS Contributions to the 21st EPS Conference on Controlled Fusion and Plasma Physics, (Montpellier, France, June 27.-July 1., 1994). W7-AS Contributions to the 15th International Conference on Plasma Physics and Controlled Nuclear Fusion Research, (Sevilla, Spain, September 25. - October 1., 1994)

Author: Endler, M., Sardei, F., Hartfuss, H., Baldzuhn, J., Brakel, R., Erckmann, V., Geiger, J., Hirsch, M., Hofmann, J., Jaenicke, R., Mandel, W., Maassberg, H., Rau, F., Sattler, S., Weller, A., Kisslinger, J., Strumberger, E., Schwenn, U., Herrnegger, F., Kühner, G., and Wagner, F.
Published: 1994

123. Diagnostics design for steady-state operation of the Wendelstein 7-X stellarator

Author: König, R., primary, Baldzuhn, J., additional, Biel, W., additional, Biedermann, C., additional, Burhenn, R., additional, Bozhenkov, S., additional, Cantarini, J., additional, Dreier, H., additional, Endler, M., additional, Hartfuss, H.-J., additional, Hildebrandt, D., additional, Hirsch, M., additional, Jakubowski, M., additional, Jimenez-Gomez, R., additional, Kocsis, G., additional, Kornejev, P., additional, Krychowiak, M., additional, Laqua, H. P., additional, Laux, M., additional, Oosterbeek, J. W., additional, Pasch, E., additional, Richert, T., additional, Schneider, W., additional, Schweer, B., additional, Svensson, J., additional, Thomsen, H., additional, Weller, A., additional, Werner, A., additional, Wolf, R., additional, Zhang, D., additional, and Zoletnik, S., additional
Published: 2010
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124. Design criteria of the bolometer diagnostic for steady-state operation of the W7-X stellarator

Author: Zhang, D., primary, Burhenn, R., additional, Koenig, R., additional, Giannone, L., additional, Grodzki, P. A., additional, Klein, B., additional, Grosser, K., additional, Baldzuhn, J., additional, Ewert, K., additional, Erckmann, V., additional, Hirsch, M., additional, Laqua, H. P., additional, and Oosterbeek, J. W., additional
Published: 2010
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125. Cold Tests of the Superconducting Coils for the Stellarator W7-X

Author: Baldzuhn, J., primary, Ehmler, H., additional, Genini, L., additional, Hertel, K., additional, Hoelting, A., additional, Sborchia, C., additional, and Schild, T., additional
Published: 2008
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126. W7-AS/W7-X Contributions to the 19th European Conference on controlled Fusion and Plasma Heating, Innsbruck, June 29 to Juli, 3, 1992. W7-AS Contributions to the 10th PSI Conference, Monterey, USA, March 30 to April 3, 1992

Author: Erckmann, V., Baldzuhn, J., Estrada, T., Gasparino, U., Giannone, L., Hartfuß, H., Hofmann, J., Maaßberg, H., Rau, F., Renner, H., Teubel, A., Weller, A., Wolff, H., Zöpfel, S., Beidler, C., Kißlinger, J., Wobig, H., Zheng, L., Burhenn, R., Grigull, P., and Sardei, F.
Published: 1992

127. Paschen Testing on W7-X Coils and Components in the BNN Test Facility

Author: Scheller, H., primary, Langenberg, H.-P., additional, Kuhnberg, M., additional, Baldzuhn, J., additional, Petersen-Zarling, B., additional, Gustke, D., additional, and Fillunger, H., additional
Published: 2006
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128. Progress in the Design, Manufacture and Testing of the W7-X Superconducting Magnets

Author: Sborchia, C., primary, Baldzuhn, J., additional, Feist, J.H., additional, Risse, K., additional, Rummel, T., additional, Viebke, H., additional, and Wanner, M., additional
Published: 2006
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129. Comparative Analysis of Impulse and Impedance Tests to Detect Short Circuits Within the W7-X Magnets

Author: Ehmler, H., primary, Fillunger, H., additional, Baldzuhn, J., additional, Maix, R.K., additional, Jeckle, A., additional, Parodi, S., additional, Rummel, T., additional, Ribe, K., additional, and Scheller, H., additional
Published: 2006
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130. Dynamics of poloidal flows and turbulence at the H-mode transition in W7-AS

Author: Hirsch, M, primary, Baldzuhn, J, additional, Ehmler, H, additional, Holzhauer, E, additional, and Wagner, F, additional
Published: 2006
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131. W7-AS: One step of the Wendelstein stellarator line

Author: Wagner, F., primary, Bäumel, S., additional, Baldzuhn, J., additional, Basse, N., additional, Brakel, R., additional, Burhenn, R., additional, Dinklage, A., additional, Dorst, D., additional, Ehmler, H., additional, Endler, M., additional, Erckmann, V., additional, Feng, Y., additional, Gadelmeier, F., additional, Geiger, J., additional, Giannone, L., additional, Grigull, P., additional, Hartfuss, H.-J., additional, Hartmann, D., additional, Hildebrandt, D., additional, Hirsch, M., additional, Holzhauer, E., additional, Igitkhanov, Y., additional, Jänicke, R., additional, Kick, M., additional, Kislyakov, A., additional, Kisslinger, J., additional, Klinger, T., additional, Klose, S., additional, Knauer, J. P., additional, König, R., additional, Kühner, G., additional, Laqua, H. P., additional, Maassberg, H., additional, McCormick, K., additional, Niedermeyer, H., additional, Nührenberg, C., additional, Pasch, E., additional, Ramasubramanian, N., additional, Ruhs, N., additional, Rust, N., additional, Sallander, E., additional, Sardei, F., additional, Schubert, M., additional, Speth, E., additional, Thomsen, H., additional, Volpe, F., additional, Weller, A., additional, Werner, A., additional, Wobig, H., additional, Würsching, E., additional, Zarnstorff, M., additional, and Zoletnik, S., additional
Published: 2005
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132. Charge exchange spectroscopy by Fabry–Pérot spectrometer in W7-AS

Author: Yoshinuma, M., primary, Ida, K., additional, and Baldzuhn, J., additional
Published: 2004
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133. Experiments on Gas Jet in the Wendelstein 7-AS Stellarator

Author: Lianghua, Yao, primary and Baldzuhn, J, additional
Published: 2003
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134. Bolometer tomography at the density limit of the HDH mode in the W7-AS stellarator

Author: Giannone, L, primary, Brakel, R, additional, Burhenn, R, additional, Ehmler, H, additional, Feng, Y, additional, Grigull, P, additional, McCormick, K, additional, Wagner, F, additional, Baldzuhn, J, additional, Igitkhanov, Y, additional, Knauer, J, additional, Nishimura, K, additional, Pasch, E, additional, Peterson, B J, additional, Ramasubramanian, N, additional, Rust, N, additional, Weller, A, additional, Werner, A, additional, and Team, the W7-AS, additional
Published: 2003
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135. Perpendicular neutral beam injection into the stellarator W7-AS

Author: Baldzuhn, J, primary, Werner, A, additional, Wobig, H, additional, Rust, N, additional, Klose, S, additional, and Team, W7-AS, additional
Published: 2003
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136. Characterization of turbulence in L- and ELM-free H-mode Wendelstein 7-AS plasmas

Author: Basse, N P, primary, Zoletnik, S, additional, Antar, G Y, additional, Baldzuhn, J, additional, Werner, A, additional, and Team, the W7-AS, additional
Published: 2003
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137. Charge-exchange spectroscopy at the W7-AS stellarator employing a high-energy Li beam

Author: Ehmler, H, primary, Baldzuhn, J, additional, McCormick, K, additional, Kreter, A, additional, Klinger, T, additional, and Team, W7-AS, additional
Published: 2002
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138. A new quasi-stationary, very high density plasma regime on the W7-AS stellarator

Author: Jaenicke, R, primary, Baeumel, S, additional, Baldzuhn, J, additional, Brakel, R, additional, Burhenn, R, additional, Ehmler, H, additional, Endler, M, additional, Erckmann, V, additional, Feng, Y, additional, Gadelmeier, F, additional, Geiger, J, additional, Giannone, L, additional, Grigull, P, additional, Hartfuss, H J, additional, Hartmann, D, additional, Hildebrandt, D, additional, Hirsch, M, additional, Holzhauer, E, additional, Kick, M, additional, Kisslinger, J, additional, Klinger, T, additional, Klose, S, additional, Knauer, J, additional, Koenig, R, additional, Kuehner, G, additional, Laqua, H, additional, Maassberg, H, additional, McCormick, K, additional, Narayanan, R, additional, Niedermeyer, H, additional, Pasch, E, additional, Ruhs, N, additional, Rust, N, additional, Saffert, J, additional, Sardei, F, additional, Schneider, F, additional, Schubert, M, additional, Speth, E, additional, Wagner, F, additional, Weller, A, additional, Wenzel, U, additional, Werner, A, additional, and Wuersching, E, additional
Published: 2002
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139. Effects of the New Island Divertor on the Plasma Performance in the W7-AS Stellarator.

Author: Grigull, P., McCormick, K., Baldzuhn, J., Burhenn, R., Brakel, R., Ehmler, H., Feng, Y., Gadelmeier, F., Giannone, L., Hartmann, D., Hildebrandt, D., Hirsch, M., Jaenicke, R., Kisslinger, J., Klinger, T., Knauer, J., König, R., Naujoks, D., and Niedermeyer, H.
Subjects: PLASMA confinement, PINCH effect (Physics), CONTROLLED fusion, HIGH temperature plasmas
Abstract: The island divertor in the W7-AS stellarator enables access to a new NBI-heated, high density operating regime with promising confinement properties. This regime -- the High Density H-Mode -- displays no evident mode activity, is extant above a threshold density and characterized by flat density profiles, high energy- and low impurity-confinement times and edge localized radiation. Impurity accumulation, normally associated with ELM-free H-modes, is avoided. Quasi steady-state discharges with &nmacr;e up to 4 10[SUP20]m[SUP-3], edge radiation levels up to 90%, and partial plasma detachment at the divertor targets can be simultaneously realized. [ABSTRACT FROM AUTHOR]
Published: 2003

140. Doppler reflectometry for the investigation of propagating density perturbations

Author: Hirsch, M, primary, Holzhauer, E, additional, Baldzuhn, J, additional, Kurzan, B, additional, and Scott, B, additional
Published: 2001
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141. Doppler reflectometry for the investigation of propagating density perturbations

Author: Hirsch, M., primary, Holzhauer, E., additional, Baldzuhn, J., additional, and Kurzan, B., additional
Published: 2001
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142. Operational conditions and characteristics of ELM-events during H-mode plasmas in the stellarator W7-AS

Author: Hirsch, M, Grigull, P, Wobig, H, Kisslinger, J, McCormick, K, Anton, M, Baldzuhn, J, Fiedler, S, Fuchs, Ch, Geiger, J, Giannone, L, Hartfuss, H-J, Holzhauer, E, Hirsch, M, Grigull, P, Wobig, H, Kisslinger, J, McCormick, K, Anton, M, Baldzuhn, J, Fiedler, S, Fuchs, Ch, Geiger, J, Giannone, L, Hartfuss, H-J, Jaenicke, R, Kick, M, Maassberg, H, Wagner, F, and Weller, A
Abstract: H-mode operation in the low-shear stellarator W7-AS is achieved for specific plasma edge topologies characterized by three `operational windows' of the edge rotational transform. An explanation for this strong influence of the magnetic configuration could be the increase of viscous damping if rational surfaces and thus island structures occur withinthe relevant plasma edge layer, thereby impeding the development of an edge transport barrier. Prior to the final transition to a quiescent state, the plasma edge passes a rich phenomenology of dynamic behaviour such as dithering and ELMs. Plasma edge parameters indicate that a quiescent H-mode occurs if a certain edge pressure is achieved.
Published: 2000
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143. Plasma diagnostics and physics in the W7-AS stellarator

Author: Weller, A, primary, Baldzuhn, J, additional, Brakel, R, additional, Burhenn, R, additional, Erckmann, V, additional, Feng, Y, additional, Fiedler, S, additional, Geiger, J, additional, Giannone, L, additional, Grigull, P, additional, Hartfuss, H.J, additional, Hirsch, M, additional, Hofmann, J.V, additional, Kick, M, additional, Konrad, C, additional, Maassberg, H, additional, Rust, N, additional, Sardei, F, additional, and Suvorov, E.V, additional
Published: 1997
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144. High power heating experiments on WENDELSTEIN 7-AS stellarator

Author: Jaenicke, R, primary, Baldzuhn, J, additional, Erckmann, V, additional, Geiger, J, additional, Grigull, P, additional, Hofmann, J V, additional, Kick, M, additional, Kisslinger, J, additional, Kuhner, G, additional, Maassberg, H, additional, Niedermeyer, H, additional, Ott, W, additional, Penningsfeld, F P, additional, Ringler, H, additional, Stroth, U, additional, and Weller, A, additional
Published: 1995
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145. Recent transport experiments in W7-AS on the stellarator-tokamak comparison

Author: Stroth, U, primary, Brañas, B, additional, Estrada, T, additional, Giannone, L, additional, Hartfuβ, H -J, additional, Hirsch, M, additional, Kick, M, additional, Kühner, G, additional, Sattler, S, additional, Baldzuhn, J, additional, Brakel, R, additional, Erckmann, V, additional, Jänicke, R, additional, Ringler, H, additional, Wagner, F, additional, Group, the ECRH, additional, and Team, the W7-AS, additional
Published: 1995
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146. Recent Transport Experiments in W7-AS

Author: Stroth, U., primary, Baldzuhn, J., additional, Brañas, B., additional, Erckmann, V., additional, Estrada, T., additional, Giannone, L., additional, Hirsch, M., additional, Hartfuß, H.-J., additional, Kick, M., additional, Kühner, G., additional, Ringler, H., additional, and Wagner, F., additional
Published: 1995
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147. A Summary on H-Mode Studies in W7-AS

Author: Wagner, F., primary, Baldzuhn, J., additional, Brakel, R., additional, Branas, B., additional, Burhenn, R., additional, Das, J., additional, De La Luna, E., additional, Erckmann, V., additional, Feng, Y., additional, Fiedler, S., additional, Gianonne, L., additional, Grigull, P., additional, Hartfuß, H.-J., additional, Heinrich, O., additional, Herre, G., additional, Hirsch, M., additional, Hofmann, J.V., additional, Holzhauer, E., additional, Jaenicke, R., additional, Konrad, Ch., additional, Kocsis, G., additional, Ohlendorf, W., additional, Pech, P., additional, Sardei, F., additional, Wuersching, E., additional, and Zoletnik, S., additional
Published: 1995
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148. H-mode of W7-AS stellarator

Author: Wagner, F, primary, Baldzuhn, J, additional, Brakel, R, additional, Burhenn, R, additional, Erckmann, V, additional, Estrada, T, additional, Grigull, P, additional, Hartfuss, H J, additional, Herre, G, additional, Hirsch, M, additional, Hofmann, J V, additional, Jaenicke, R, additional, Rudyj, A, additional, Stroth, U, additional, and Weller, A, additional
Published: 1994
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149. Inter-machine validation study of neoclassical transport modelling in medium- to high-density stellarator-heliotron plasmas.

Author: Dinklage, A., Yokoyama, M., Tanaka, K., Velasco, J. L., López-Bruna, D., Beidler, C. D., Satake, S., Ascasibar, E., Arévalo, J., Baldzuhn, J., Feng, Y., Gates, D., Geiger, J., Ida, K., Isaev, M., Jakubowski, M., López-Fraguas, A., MaaBberg, H., Miyazawa, J., and Morisaki, T.
Subjects: PLASMA confinement devices, TRANSPORT theory, ELECTRIC discharges, PARAMETER estimation, ELECTRIC fields, FLUX (Energy)
Abstract: A comparative study of energy transport for medium- to high-density discharges in the stellarator-heliotrons TJ-II, W7-AS and LHD is carried out. The specific discharge parameters are chosen to apply a recently concluded benchmarking study of neoclassical (NC) transport coefficients (Beidler et al 2011 Nucl. Fusion 51 076001) to perform this validation study. In contrast to previous experiments at low densities for which electron transport was predominant (Yokoyama et al 2007 Nucl. Fusion 47 1213), the current discharges also exhibit significant ion energy transport. As it affects the energy transport in 3D devices, the ambipolar radial electric field is addressed as well. For the discharges described, ion-root conditions, i.e. a small negative radial electric field were found. The energy transport in the peripheral region cannot be explained by NC theory. Within a 'core region' (r/a < 1/2 ~ 2/3), the predicted NC energy fluxes comply with experimental findings for W7-AS. For TJ-II, compliance in the core region is found for the particle transport and the electron energy transport. For the specific LHD discharges, the core energy transport complied with NC theory except for the electron energy transport in the inward-shifted magnetic configuration. The NC radial electric field tends to agree with experimental results for all devices but is measured to be more negative in the core of both LHD and TJ-II. As a general observation, the energy confinement time approaches the gyro-Bohm-type confinement scaling ISS04 (Yamada et al 2005 Nucl. Fusion 45 1684). This work is carried out within the International Stellarator-Heliotron Profile Database (www.ipp.mpg.de/ISS and http://ishpdb.nifs.ac.jp/index.html). [ABSTRACT FROM AUTHOR]
Published: 2013
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150. Analysis of luminescence signals observed during pellet injection

Author: Baldzuhn, J, primary and Sandmann, W, additional
Published: 1993
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