Browsing by Author "Hartmann, D."

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Experimental characterization of the active and passive fast-ion H-alpha emission in W7-X using FIDASIM
(2024-02) Poloskei, Peter Zs; Geiger, B.; Jansen van Vuuren, A.; Äkäslompolo, S.; Ford, O.; Spanier, A.; Neelis, T. W.C.; McNeely, P.; Hartmann, D.; , W7-X Team
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
This paper presents the first results from the analysis of Balmer-alpha spectra at Wendelstein 7-X which contain the broad charge exchange emission from fast-ions. The measured spectra are compared to synthetic spectra predicted by the FIDASIM code, which has been supplied with the 3D magnetic fields from VMEC, 5D fast-ion distribution functions from ASCOT, and a realistic Neutral Beam Injection geometry including beam particle blocking elements. Detailed modeling of the beam emission shows excellent agreement between measured beam emission spectra and predictions. In contrast, modeling of beam halo radiation and Fast-Ion H-Alpha signals (FIDA) is more challenging due to strong passive contributions. While about 50% of the halo radiation can be attributed to passive signals from edge neutrals, the FIDA emission—in particular for an edge-localized line of sights—is dominated by passive emission. This is in part explained by high neutral densities in the plasma edge and in part by edge-born fast-ion populations as demonstrated by detailed modeling of the edge fast-ion distribution.
Experimental confirmation of efficient island divertor operation and successful neoclassical transport optimization in Wendelstein 7-X
(2022-04-01) Pedersen, Thomas Sunn; Abramovic, Ivana; Agostinetti, P.; Torres, M. Agredano; Aekaeslompolo, S.; Belloso, J. Alcuson; Aleynikov, P.; Aleynikova, K.; Alhashimi, M.; Ali, A.; Allen, N.; Alonso, A.; Anda, G.; Andreeva, T.; Angioni, C.; Arkhipov, A.; Arnold, A.; Asad, W.; Ascasibar, E.; Aumeunier, M-H; Avramidis, K.; Aymerich, E.; Baek, S-G; Baehner, J.; Baillod, A.; Balden, M.; Baldzuhn, J.; Ballinger, S.; Banduch, M.; Bannmann, S.; Navarro, A. Banon; Barbui, T.; Beidler, C.; Belafdil, C.; Bencze, A.; Benndorf, A.; Beurskens, M.; Biedermann, C.; Biletskyi, O.; Blackwell, B.; Blatzheim, M.; Bluhm, T.; Boeckenhoff, D.; Bongiovi, G.; Borchardt, M.; Borodin, D.; Boscary, J.; Bosch, H.; Bosmann, T.; Boeswirth, B.; Boettger, L.; Bottino, A.; Bozhenkov, S.; Brakel, R.; Brandt, C.; Braeuer, T.; Braune, H.; Brezinsek, S.; Brunner, K.; Buller, S.; Burhenn, R.; Bussiahn, R.; Buttenschoen, B.; Buzas, A.; Bykov, Yuri; Calvo, Ivan; Mata, K. Camacho; Caminal; Cannas, B.; Cappa, A.; Carls, A.; Carovani, F.; Carr, M.; Carralero, D.; Carvalho, B.; Casas, J.; Castano-Bardawil, D.; Castejon, F.; Chaudhary, N.; Chelis; Chomiczewska, A.; Coenen, J. W.; Cole, M.; Cordella, F.; Corre, Y.; Crombe, K.; Cseh, G.; Csillag, B.; Damm, H.; Day, C.; de Baar, M.; De la Cal, E.; Degenkolbe, S.; Demby, A.; Denk, S.; Dhard, C.; Di Siena, A.; Dinklage, A.; Dittmar, T.; Dreval, M.; Drevlak, M.; Drewelow, P.; Drews, P.; Dunai, D.; Edlund, E.; Effenberg, F.; Ehrke, G.; Endler, M.; Ennis, D. A.; Escoto, F. J.; Estrada, T.; Fable, E.; Fahrenkamp, N.; Fanni, A.; Faustin, J.; Fellinger, J.; Feng, Y.; Figacz, W.; Flom, E.; Ford, O.; Fornal, T.; Frerichs, H.; Freundt, S.; Fuchert, G.; Fukuyama, M.; Fullenbach, F.; Gantenbein, G.; Gao, Y.; Garcia, K.; Regana, J. M. Garcia; Garcia-Cortes; Gaspar, J.; Gates, D. A.; Geiger, J.; Geiger, B.; Giudicotti, L.; Gonzalez, A.; Goriaev, A.; Gradic, D.; Grahl, M.; Graves, J. P.; Green, J.; Grelier, E.; Greuner, H.; Gross, S.; Grote, H.; Groth, M.; Gruca, M.; Grulke, O.; Gruen, M.; Arnaiz, J. Guerrero; Guenter, S.; Haak; Haas, M.; Hacker, P.; Hakola, A.; Hallenbert, A.; Hammond, K.; Han, X.; Hansen, S. K.; Harris, J. H.; Hartfuss, H.; Hartmann, D.; Hathiramani, D.; Hatzky, R.; Hawke, J.; Hegedus, S.; Hein, B.; Heinemann, B.; Helander, P.; Henneberg, S.; Hergenhahn, U.; Hidalgo, C.; Hindenlang, F.; Hirsch, M.; Hoefel, U.; Hollfeld, K. P.; Holtz, A.; Hopf, D.; Hoeschen, D.; Houry, M.; Howard, J.; Huang, X.; Hubeny, M.; Hudson, S.; Ida, K.; Igitkhanov, Y.; Igochine, Valentin; Illy, S.; Ionita-Schrittwieser, C.; Isobe, M.; Jablonski, S.; Jagielski, B.; Jakubowski, M.; Jansen van Vuuren, Anton; Jelonnek, J.; Jenko, F.; Jensen, T.; Jenzsch, H.; Junghanns, P.; Kaczmarczyk, J.; Kallmeyer, J.; Kamionka, U.; Kandler, M.; Kasilov, S.; Kazakov, Y.; Kennedy, D.; Kharwandikar, A.; Khokhlov, M.; Kiefer, C.; Killer, C.; Kirschner, A.; Kleiber, R.; Klinger, T.; Klose, S.; Knauer, J.; Knieps, A.; Koechl, F.; Kocsis, G.; Kolesnichenko, Ya; Koenies, A.; Koenig, R.; Kontula, J.; Kornejew, P.; Koschinsky, J.; Kozulia, M. M.; Kraemer-Flecken, A.; Krampitz, R.; Krause, M.; Krawczyk, N.; Kremeyer, T.; Krier, L.; Kriete, D. M.; Krychowiak, M.; Ksiazek, I.; Kubkowska, M.; Kuczynski, M.; Kuehner, G.; Kumar, A.; Kurki-Suonio, T.; Kwak, S.; Landreman, M.; Lang, P. T.; Langenberg, A.; Laqua, H. P.; Laqua, H.; Laube, R.; Lazerson, S.; Lewerentz, M.; Li, C.; Liang, Y.; Linsmeier, Ch; Lion, J.; Litnovsky, A.; Liu, S.; Lobsien, J.; Loizu, J.; Lore, J.; Lorenz, A.; Losada, U.; Louche, F.; Lunsford, R.; Lutsenko, VN; Machielsen, M.; Mackel, F.; Maisano-Brown, J.; Maj, O.; Makowski, D.; Manduchi, G.; Maragkoudakis, E.; Marchuk, O.; Marsen, S.; Martines, E.; Martinez-Fernandez, J.; Marushchenko, M.; Masuzaki, S.; Maurer, D.; Mayer, M.; McCarthy, K. J.; Mccormack, O.; McNeely, P.; Meister, H.; Mendelevitch, B.; Mendes, S.; Merlo, A.; Messian, A.; Mielczarek, A.; Mishchenko, O.; Missal, B.; Mitteau, R.; Moiseenko, V. E.; Mollen, A.; Moncada, Victor; Moennich, T.; Morisaki, T.; Moseev, D.; Motojima, G.; Mulas, S.; Mulsow, M.; Nagel, M.; Naujoks, D.; Naulin, Volker; Neelis, T.; Neilson, H.; Neu, R.; Neubauer, O.; Neuner, U.; Nicolai, D.; Nielsen, S. K.; Niemann, H.; Nishiza, T.; Nishizawa, T.; Nuehrenberg, C.; Ochoukov, R.; Oelmann, J.; Offermanns, G.; Ogawa, K.; Okamura, S.; Oelmanns, J.; Ongena, J.; Oosterbeek, J.; Otte, M.; Pablant, N.; Panadero Alvarez, N.; Pandey, A.; Pasch, E.; Pavlichenko, R.; Pavone, A.; Pawelec, E.; Pechstein, G.; Pelka, G.; Perseo, Valeria; Peterson, B.; Pilopp, D.; Pingel, S.; Pisano, F.; Plockl, B.; Plunk, G.; Poloskei, P.; Pompe, B.; Popov, A.; Porkolab, M.; Proll, J.; Pueschel, M. J.; Puiatti, M-E; Sitjes, A. Puig; Purps, F.; Rahbarnia, K.; Rasmussen, J.; Reiman, A.; Reimold, F.; Reisner, M.; Reiter, D.; Richou, M.; Riedl, R.; Riemann, J.; Risse, K.; Roberg-Clark, G.; Rohde, Volker; Romazanov, J.; Rondeshagen, D.; Rong, P.; Rudischhauser, L.; Rummel, T.; Rummel, K.; Runov, A.; Rust, N.; Ryc, L.; Salembier, P.; Salewski, M.; Sanchez, E.; Satake, S.; Satheeswaran, G.; Schacht, J.; Scharff, E.; Schauer, F.; Schilling, J.; Schlisio, G.; Schmid, K.; Schmitt, J.; Schmitz, O.; Schneider, W.; Schneider, M.; Schneider, P.; Schrittwieser, R.; Schroeder, T.; Schroeder, M.; Schroeder, R.; Schweer, B.; Schwoerer, D.; Scott, E.; Shanahan, B.; Sias, G.; Sichta, P.; Singer, M.; Sinha, P.; Sipilä, S.; Slaby, C.; Sleczka, M.; Smith, H.; Smoniewski, J.; Sonnendrucker, E.; Spolaore, M.; Spring, A.; Stadler, R.; Stange, T.; Stepanov, A.Y.; Stephey, L.; Stober, J.; Stroth, U.; Strumberger, E.; Suzuki, C.; Suzuki, Y.; Svensson, J.; Szabolics, T.; Szepesi, T.; Szucs, M.; Tabares, F. L.; Tamura, N.; Tancetti, A.; Tantos, C.; Terry, J.; Thienpondt, H.; Thomsen, H.; Thumm, M.; Travere, J. M.; Traverso, P.; Tretter, J.; Trier, E.; Mora, H. Trimino; Tsujimura, T.; Turkin, Y.; Tykhyi, A.; Unterberg, B.; van Eeten, P.; van Milligen, B. Ph; van Schoor, M.; Vano, L.; Varoutis, S.; Vecsei, M.; Vela, L.; Velasco, J. L.; Vervier, M.; Vianello, N.; Viebke, H.; Vilbrandt, R.; Vogt, N.; Volkhausen, C.; von Stechow, A.; Wagner, F.; Wang, E.; Wang, H.; Warmer, F.; Wauters, T.; Wegener, L.; Wegner, T.; Weir, G.; Wenzel, U.; White, A.; Wilde, F.; Wilms, F.; Windisch, T.; Winkler, M.; Winter, A.; Winters, Victoria; Wolf, R.; Wright, A. M.; Wurden, G. A.; Xanthopoulos, P.; Xu, S.; Yamada, H.; Yamaguchi, H.; Yokoyama, M.; Yoshinuma, M.; Yu, Q.; Zamanov, M.; Zanini, M.; Zarnstorff, M.; Zhang, D.; Zhou, S.; Zhu, J.; Zhu, C.; Zilker, M.; Zocco, A.; Zohm, H.; Zoletnik, S.; Zsuga, L.; Vogel, G.
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
We present recent highlights from the most recent operation phases of Wendelstein 7-X, the most advanced stellarator in the world. Stable detachment with good particle exhaust, low impurity content, and energy confinement times exceeding 100 ms, have been maintained for tens of seconds. Pellet fueling allows for plasma phases with reduced ion-temperature-gradient turbulence, and during such phases, the overall confinement is so good (energy confinement times often exceeding 200 ms) that the attained density and temperature profiles would not have been possible in less optimized devices, since they would have had neoclassical transport losses exceeding the heating applied in W7-X. This provides proof that the reduction of neoclassical transport through magnetic field optimization is successful. W7-X plasmas generally show good impurity screening and high plasma purity, but there is evidence of longer impurity confinement times during turbulence-suppressed phases.
Major results from the first plasma campaign of the Wendelstein 7-X stellarator
(2017-07-27) Wolf, R.C.; Ali, Anwaar; Alonso, A.; Baldzuhn, Jürgen; Beidler, Craig; Beurskens, M.; Biedermann, C.; Bosch, H. S.; Bozhenkov, S.; Brakel, Rudolf; Dinklage, Andreas; Feng, Yue; Fuchert, G; Geiger, J.; Grulke, Olaf; Helander, P.; Hirsch, M.; Höfel, Udo; Jakubowski, M.; Knauer, Jens; Kocsis, G; König, R.; Kornejew, Petra; Kràmer-Flecken, A.; Krychowiak, M.; Landreman, Matt; Langenberg, Andreas; Laqua, H.P.; Lazerson, S.; Maaßberg, H.; Marsen, S.; Marushchenko, M.; Moseev, D; Niemann, Holger; Pablant, Novimir; Pasch, Ekkehard; Rahbarnia, Kian; Schlisio, G.; Stange, Torsten; Sunn Pedersen, T.; Svensson, J.; Szepesi, T; Trimino Mora, H.; Turkin, Yuriy; Wauters, T; Weir, Gavin; Wenzel, U.; Windisch, Thomas; Wurden, G.; Zhang, D.; Abramovic, Ivana; Äkàslompolo, S.; Aleynikov, P.; Aleynikova, Ksenia; Alzbutas, R.; Anda, G.; Andreeva, T.; Ascasibar, Enrique; Assmann, J.; Baek, S. G.; Banduch, Martin; Barbui, Tullio; Barlak, M.; Baumann, Kristin; Behr, W.; Benndorf, Andree; Bertuch, O.; Biel, Wolfgang; Birus, Dietrich; Blackwell, Boyd; Blanco, E.; Blatzheim, Marko; Bluhm, Torsten; Böckenhoff, Daniel; Bolgert, Peter; Borchardt, Matthias; Borsuk, V.; Boscary, J.; Böttger, Lukas Georg; van den Brand, H; Brandt, Ch; Bràuer, T.; Braune, H.; Brezinsek, S; Brunner, K. J.; Brünner, B.; Burhenn, R.; Buttenschön, Birger; Bykov, Victor; Calvo, Ivan; Cannas, B.; Cappa, Alvaro; Carls, Andre; Carraro, L.; Carvalho, B. B.; Castejon, Francisco; Charl, A.; Chernyshev, F.; Cianciosa, Mark; Citarella, R.; Ciupiński; Claps, G.; Cole, Elizabeth M.; Cole, M. J.; Cordella, F.; Cseh, G; Czarnecka, A; Czermak, A.; Czerski, K.; Czerwinski, M.; Czymek, G.; Da Molin, A.; Da Silva, A.; Dammertz, G.; Danielson, J.; De La Pena, Angel; Degenkolbe, Sven; Denner, P; Dhard, D. P.; Dostal, Marion; Drevlak, Michael; Drewelow, P.; Drews, Ph; Dudek, Andrzej; Dundulis, G.; Durodie, F.; Von Eeten, Paul; Effenberg, Florian; Ehrke, G.; Endler, M; Ennis, D.; Erckmann, E.; Esteban, H.; Estrada, T.; Fahrenkamp, Nils; Feist, J. H.; Fellinger, Joris; Fernandes, H.; Fietz, W. H.; Figacz, Waldemar; Fontdecaba, J.; Ford, O; Fornal, Tomasz; Frerichs, H.; Freund, A.; Führer, M.; Funaba, T.; Galkowski, A.; Gantenbein, G.; Gao, Y.; García Regaña, J.; Garcia-Munoz, M; Gates, D.; Gawlik, G.; Geiger, B.; Giannella, V.; Gierse, N.; Gogoleva, Alena; Goncalves, Bruno; Goriaev, A.; Gradic, Dorothea; Grahl, Michael; Green, J.; Grosman, A.; Grote, Heinz; Gruca, M.; Guerard, Carlos; Haiduk, L.; Han, Xiaofeng; Harberts, F.; Harris, J. H.; Hartfuß, H.-J.; Hartmann, D.; Hathiramani, Dag; Hein, Bernd; Heinemann, B; Heitzenroeder, P.; Henneberg, Sophia; Hennig, C.; Hernandez Sanchez, J.; Hidalgo, C.; Hölbe, Hauke; Hollfeld, K. P.; Hölting, Alf; Höschen, D.; Houry, Michael; Howard, J.; Huang, X.; Huber, M.; Huber, Valentina; Hunger, H.; Ida, K.; Ilkei, T; Illy, S.; Israeli, Ben; Ivanov, A.; Jablonski, Slowomir; Jagielski, J.; Jelonnek, J.; Jenzsch, Hartmut; Junghans, P.; Kacmarczyk, J.; Kaliatka, T.; Kallmeyer, Johann Peter; Kamionka, Ute; Karalevicius, R.; Kasahara, Hiroshi; Kasparek, W.; Kenmochi, Naoki; Keunecke, M.; Khilchenko, A.; Kinna, D. J.; Kleiber, Ralf; Klinger, T.; Knaup, M.; Kobarg, Th; Köchl, F.; Kolesnichenko, Yaroslav; Könies, Axel; Köppen, M.; Koshurinov, J.; Koslowski, R; Köster, Friedemann; Koziol, R.; Kràmer, M.; Krampitz, Rüdiger; Kraszewsk, P.; Krawczyk, N.; Kremeyer, Thierry; Krings, Th; Krom, JG; Krzesinski, G.; Ksiazek, I.; Kubkowska, M.; Kühner, Georg; Kurki-Suonio, T.; Kwak, Sehyun; Lang, Karl R.; Langish, S.; Laqua, H.; Laube, Ralph; Lechte, C.; Lennartz, M.; Leonhardt, W.; Lewerentz, L.; Liang, Y.; Linsmeier, Ch.; Liu, S. C.; Lobsien, Jim Felix; Loesser, D.; Loizu Cisquella, J.; Lore, J. D.; Lorenz, A.; Losert, M.; Lubyako, L.; Lücke, A.; Lumsdaine, A.; Lutsenko, VN; Majano-Brown, J.; Marchuk, O.; Mardenfeld, M.; Marek, P.; Massidda, S.; Masuzaki, S.; Maurer, D.; McCarthy, Kieran; McNeely, Paul; Meier, A.; Mellein, D.; Mendelevitch, B.; Mertens, Ph.; Mikkelsen, DR; Mishchenko, O.; Missal, Bernd; Mittelstaedt, Joseph; Mizuuchi, T.; Mollen, Albert; Moncada, Victor; Mönnich, Thomas; Morizaki, T.; Munk, R.; Murakami, S.; Musielok, F.; Náfrádi, G.; Nagel, Mathias; Naujoks, Dirk; Neilson, G. Hutch; Neubauer, O.; Neuner, U.; Ngo, Tran Tranh; Nocentini, R.; Nührenberg, Carolin; Nührenberg, Jürgen; Obermayer, S.; Offermanns, G.; Ogawa, K.; Ongena, J.; Oosterbeek, J. W.; Orozco, G.; Otte, M.; Pacios Rodriguez, L.; Pan, Wei; Panadero, N.; Panadero Alvarez, N.; Panin, A.; Papenfuß, D.; Paqay, S.; Pavone, Andrea; Pawelec, Ewa; Pelka, G.; Peng, Xiaoniu; Perseo, Valeria; Peterson, Ben; Pieper, A.; Pilopp, Dirk; Pingel, S.; Pisano, F.; Plaum, B; Plunk, Gabriel; Povilaitis, M.; Preinhaelter, J.; Proll, Josefine; Puiatti, M.E.; Puig Sitjes, A.; Purps, Frank; Rack, M.; Récsei, S.; Reiman, A.; Reiter, D.; Remppel, F.; Renard, S.; Riedl, R; Riemann, Jörg; Rimkevicius, S.; Riße, K.; Rodatos, A.; Röhlinger, H.; Romé, M.; Rong, Peter; Roscher, H. J.; Roth, B.; Rudischhauser, Lukas; Rummel, Kerstin; Rummel, Thomas; Runov, A.; Rust, Norbert; Ryc, L.; Ryosuke, S.; Sakamoto, R.; Samartsev, A.; Sanchez, M.; Sano, F.; Satake, Shinsuke; Satheeswaran, G.; Schacht, Jörg; Schauer, F.; Scherer, T.; Schlaich, A.; Schlüter, K. H.; Schmitt, J.; Schmitz, Hans Christian; Schmitz, O; Schmuck, S.; Schneider, M; Schneider, W; Scholz, M.; Scholz, P.; Schrittwieser, R; Schröder, Michael; Schröder, Timo; Schroeder, R.; Schumacher, Hans Werner; Schweer, B.; Shanahan, B.; Shikhovtsev, I. V.; Sibilia, M.; Sinha, Priyanjana; Sipilä, Seppo; Skodzik, J.; Slaby, Christoph; Smith, Håkan; Spiess, W.; Spong, D. A.; Spring, Anett; Stadler, Rolf; Standley, Brian; Stephey, Laurie; Stoneking, Matthew; Stridde, Uwe; Sulek, Z.; Surko, C.; Suzuki, Y.; Szabó, V.; Szabolics, T.; Szökefalvi-Nagy, Z.; Tamura, Naoyuki; Terra, A.; Terry, J.L.; Thomas, J. D.; Thomsen, H.; Thumm, M.; Thun, C.P; Timmermann, D.; Titus, P.; Toi, K.; Travere, J. M.; Traverso, Paolo; Tretter, J.; Tsuchiya, Hayato; Tsujimura, T.; Tulipán, S.; Turnyanskiy, M.; Unterberg, B.; Urban, Maximilian J.; Urbonavicius, E.; Vakulchyk, I.; Valet, Swetlana; Van Millingen, B.; Vela, Luis; Velasco, Jose Luis; Vergote, Maarten; Vervier, M.; Vianello, N; Viebke, Holger; Vilbrandt, Reinhard; Vorkörper, A.; Wadle, S.; Wagner, Friedrich; Wang, Erhui; Wang, Nan; Warmer, Felix; Wegener, Lutz; Weggen, J.; Wei, Y.; Wendorf, Jörg; Werner, Andreas; Wiegel, Burkhard; Wilde, Fabian; Winkler, E.; Winters, Victoria; Wolf, N. S.; Wolowski, J.; von Wright, A.; Xanthopoulos, Pavlos; Yamada, Hirofumi; Yamada, Ichihiro; Yasuhara, Ryo; Yokoyama, Masayuki; Zajac, J.; Zarnstorff, MC; Zeitler, J. Axel; Zhang, H.; Zhu, Jun; Zilker, Manfred; Zimbal, Andreas; Zocco, Alessandro; Zoletnik, S.; Zuin, M.
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
After completing the main construction phase of Wendelstein 7-X (W7-X) and successfully commissioning the device, first plasma operation started at the end of 2015. Integral commissioning of plasma start-up and operation using electron cyclotron resonance heating (ECRH) and an extensive set of plasma diagnostics have been completed, allowing initial physics studies during the first operational campaign. Both in helium and hydrogen, plasma breakdown was easily achieved. Gaining experience with plasma vessel conditioning, discharge lengths could be extended gradually. Eventually, discharges lasted up to 6 s, reaching an injected energy of 4 MJ, which is twice the limit originally agreed for the limiter configuration employed during the first operational campaign. At power levels of 4 MW central electron densities reached 3 1019 m-3, central electron temperatures reached values of 7 keV and ion temperatures reached just above 2 keV. Important physics studies during this first operational phase include a first assessment of power balance and energy confinement, ECRH power deposition experiments, 2nd harmonic O-mode ECRH using multi-pass absorption, and current drive experiments using electron cyclotron current drive. As in many plasma discharges the electron temperature exceeds the ion temperature significantly, these plasmas are governed by core electron root confinement showing a strong positive electric field in the plasma centre.
Overview of first Wendelstein 7-X high-performance operation
(2019-11) Klinger, T.; Andreeva, T.; Bozhenkov, S.; Brandt, C.; Burhenn, R.; Buttenschoen, B.; Fuchert, G.; Geiger, B.; Grulke, O.; Laqua, H. P.; Pablant, N.; Rahbarnia, K.; Stange, T.; von Stechow, A.; Tamura, N.; Thomsen, H.; Turkin, Y.; Wegner, T.; Abramovic, Ivana; Aekaeslompolo, S.; Alcuson, J.; Aleynikov, P.; Aleynikova, K.; Ali, A.; Alonso, A.; Anda, G.; Ascasibar, E.; Baehner, J. P.; Baek, S. G.; Balden, M.; Baldzuhn, J.; Banduch, M.; Barbui, T.; Behr, W.; Beidler, C.; Benndorf, A.; Biedermann, C.; Biel, W.; Blackwell, B.; Blanco, E.; Blatzheim, M.; Ballinger, S.; Bluhm, T.; Boeckenhoff, D.; Boeswirth, B.; Boettger, L-G; Borchardt, M.; Borsuk, Mark; Boscary, J.; Bosch, H-S; Beurskens, M.; Brakel, R.; Brand, H.; Braeuer, T.; Braune, H.; Brezinsek, S.; Brunner, K-J; Bussiahn, R.; Bykov, I.; Cai, J.; Calvo, Iván; Cannas, B.; Cappa, A.; Carls, A.; Carralero, D.; Carraro, L.; Carvalho, B.; Castejon, F.; Charl, A.; Chaudhary, N.; Chauvin, D.; Chernyshev, F.; Cianciosa, M.; Citarella, R.; Claps, G.; Coenen, J.; Cole, M. J.; Cordella, F.; Cseh, G.; Czarnecka, A.; Czerski, K.; Czerwinski, M.; Czymek, G.; da Molin, A.; da Silva, A.; Damm, H.; de la Pena, A.; Degenkolbe, S.; Dhard, C. P.; Dibon, M.; Dinklage, A.; Dittmar, T.; Drevlak, M.; Drewelow, P.; Drews, P.; Durodie, F.; Edlund, E.; van Eeten, P.; Effenberg, F.; Ehrke, G.; Elgeti, S.; Endler, M.; Ennis, D.; Esteban, H.; Estrada, T.; Fellinger, J.; Feng, Y.; Flom, E.; Fernandes, H.; Fietz, W. H.; Figacz, W.; Fontdecaba, J.; Ford, O.; Fornal, T.; Frerichs, H.; Freund, A.; Funaba, T.; Galkowski, A.; Gantenbein, G.; Gao, Y.; Garcia Regana, J.; Gates, D.; Geiger, J.; Giannella, R.; Gogoleva, A.; Goncalves, B.; Goriaev, A.; Gradic, D.; Grahl, M.; Green, J.; Greuner, H.; Grosman, A.; Grote, H.; Gruca, M.; Guerard, C.; Hacker, P.; Han, X.; Harris, J. H.; Hartmann, D.; Hathiramani, D.; Hein, B.; Heinemann, B.; Helander, P.; Henneberg, S.; Henkel, M.; Hernandez Sanchez, J.; Hidalgo, C.; Hirsch, M.; Hollfeld, K. P.; Hoefel, U.; Hoelting, A.; Hoeschen, D.; Houry, M.; Howard, J.; Huang, X.; Huang, Z.; Hubeny, M.; Huber, M.; Hunger, H.; Ida, K.; Ilkei, T.; Illy, S.; Israeli, B.; Jablonski, S.; Jakubowski, M.; Jelonnek, J.; Jenzsch, H.; Jesche, T.; Jia, M.; Junghanns, P.; Kacmarczyk, J.; Kallmeyer, J-P; Kamionka, U.; Kasahara, H.; Kasparek, W.; Kazakov, Y. O.; Kenmochi, N.; Killer, C.; Kirschner, A.; Kleiber, R.; Knauer, J.; Knaup, M.; Knieps, A.; Kobarg, T.; Kocsis, G.; Koechl, F.; Kolesnichenko, Y.; Koenies, A.; Koenig, R.; Kornejew, P.; Koschinsky, J-P; Koester, F.; Kraemer, M.; Krampitz, R.; Kraemer-Flecken, A.; Krawczyk, N.; Kremeyer, T.; Krom, J.; Krychowiak, M.; Ksiazek, I.; Kubkowska, M.; Kuehner, G.; Kurki-Suonio, T.; Kurz, P. A.; Kwak, S.; Landreman, M.; Lang, P.; Lang, R.; Langenberg, A.; Langish, S.; Laqua, H.; Laube, R.; Lazerson, S.; Lechte, C.; Lennartz, M.; Leonhardt, W.; Li, C.; Li, Y.; Liang, Y.; Linsmeier, C.; Liu, S. C.; Lobsien, J-F; Loesser, D.; Cisquella, J. Loizu; Lore, J.; Lorenz, A.; Losert, M.; Lucke, A.; Lumsdaine, A.; Lutsenko, VN; Maassberg, H.; Marchuk, O.; Matthew, J. H.; Marsen, S.; Marushchenko, M.; Masuzaki, S.; Maurer, D.; Mayer, M.; McCarthy, K.; McNeely, P.; Meier, A.; Mellein, D.; Mendelevitch, B.; Mertens, P.; Mikkelsen, D.; Mishchenko, A.; Missal, B.; Mittelstaedt, J.; Mizuuchi, T.; Mollen, A.; Moncada, Victor; Moennich, T.; Morisaki, T.; Moseev, D.; Murakami, S.; Nafradi, G.; Nagel, M.; Naujoks, D.; Neilson, H.; Neu, R.; Neubauer, O.; Neuner, U.; Ngo, T.; Nicolai, D.; Nielsen, S. K.; Niemann, H.; Nishizawa, T.; Nocentini, R.; Nuehrenberg, C.; Nuehrenberg, J.; Obermayer, S.; Offermanns, G.; Ogawa, K.; Oelmanns, J.; Ongena, J.; Oosterbeek, J. W.; Orozco, G.; Otte, M.; Pacios Rodriguez, L.; Panadero, N.; Panadero Alvarez, N.; Papenfuss, D.; Paqay, S.; Pasch, E.; Pavone, A.; Pawelec, E.; Pedersen, T. S.; Pelka, G.; Perseo, Valeria; Peterson, B.; Pilopp, D.; Pingel, S.; Pisano, F.; Plaum, B.; Plunk, G.; Poeloeskei, P.; Porkolab, M.; Proll, J.; Puiatti, M-E; Sitjes, A. Puig; Purps, F.; Rack, M.; Recsei, S.; Reiman, A.; Reimold, F.; Reiter, D.; Remppel, F.; Renard, S.; Riedl, R.; Riemann, J.; Risse, K.; Rohde, Volker; Roehlinger, H.; Rome, M.; Rondeshagen, D.; Rong, P.; Roth, B.; Rudischhauser, L.; Rummel, K.; Rummel, T.; Runov, A.; Rust, N.; Ryc, L.; Ryosuke, S.; Sakamoto, R.; Salewski, M.; Samartsev, A.; Sanchez, E.; Sano, F.; Satake, S.; Schacht, J.; Satheeswaran, G.; Schauer, F.; Scherer, T.; Schilling, J.; Schlaich, A.; Schlisio, G.; Schluck, F.; Schlueter, K-H; Schmitt, J.; Schmitz, H.; Schmitz, O.; Schmuck, S.; Schneider, M.; Schneider, W.; Scholz, P.; Schrittwieser, R.; Schröder, Michael; Schroeder, T.; Schroeder, R.; Schumacher, H.; Schweer, B.; Scott, E.; Sereda, S.; Shanahan, B.; Sibilia, M.; Sinha, P.; Siplia, S.; Slaby, C.; Sleczka, M.; Smith, H.; Spiess, W.; Spong, D. A.; Spring, A.; Stadler, R.; Stejner, M.; Stephey, L.; Stridde, U.; Suzuki, C.; Svensson, J.; Szabo, Susanne J.; Szabolics, T.; Szepesi, T.; Szokefalvi-Nagy, Z.; Tancetti, A.; Terry, J.; Thomas, J.; Thumm, M.; Travere, J. M.; Traverso, P.; Tretter, J.; Mora, H. Trimino; Tsuchiya, H.; Tsujimura, T.; Tulipan, S.; Unterberg, B.; Vakulchyk, I.; Valet, S.; Vano, L.; van Milligen, B.; van Vuuren, A. J.; Vela, L.; Velasco, J-L; Vergote, M.; Vervier, M.; Vianello, N.; Viebke, H.; Vilbrandt, R.; Vorkoeper, A.; Wadle, S.; Wagner, F.; Wang, E.; Wang, N.; Wang, Z.; Warmer, F.; Wauters, T.; Wegener, L.; Weggen, J.; Wei, Y.; Weir, G.; Wendorf, J.; Wenzel, U.; Werner, A.; White, A.; Wiegel, B.; Wilde, F.; Windisch, T.; Winkler, M.; Winter, A.; Winters, Victoria; Wolf, S.; Wolf, R. C.; Wright, A.; Wurden, G.; Xanthopoulos, P.; Yamada, H.; Yamada, Ichihiro; Yasuhara, R.; Yokoyama, M.; Zanini, M.; Zarnstorff, M.; Zeitler, A.; Zhang, D.; Zhang, H.; Zhu, J.; Zilker, M.; Zocco, A.; Zoletnik, S.; Zuin, M.
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
The optimized superconducting stellarator device Wendelstein 7-X (with major radius R = 5.5 m, minor radius a = 0.5 m, and 30 m(3) plasma volume) restarted operation after the assembly of a graphite heat shield and 10 inertially cooled island divertor modules. This paper reports on the results from the first high-performance plasma operation. Glow discharge conditioning and ECRH conditioning discharges in helium turned out to be important for density and edge radiation control. Plasma densities of 1-4.5 x 10(19) m(-3) with central electron temperatures 5-10 keV were routinely achieved with hydrogen gas fueling, frequently terminated by a radiative collapse. In a first stage, plasma densities up to 1.4 x 10(20) m(-3) were reached with hydrogen pellet injection and helium gas fueling. Here, the ions are indirectly heated, and at a central density of 8 . 10(19 )m(-3) a temperature of 3.4 keV with T-e/T-i = 1 was transiently accomplished, which corresponds to nT(i)(0)tau(E) = 6.4 x 10(19) keV s m(-3) with a peak diamagnetic energy of 1.1 MJ and volume-averaged normalized plasma pressure = 1.2%. The routine access to high plasma densities was opened with boronization of the first wall. After boronization, the oxygen impurity content was reduced by a factor of 10, the carbon impurity content by a factor of 5. The reduced (edge) plasma radiation level gives routinely access to higher densities without radiation collapse, e.g. well above 1 x 10(20) m(-2) line integrated density and T-e = T-i = 2 keV central temperatures at moderate ECRH power. Both X2 and O2 mode ECRH schemes were successfully applied. Core turbulence was measured with a phase contrast imaging diagnostic and suppression of turbulence during pellet injection was observed.
Predictive simulations of NBI ion power load to the ICRH antenna in Wendelstein 7-X
(2023-07) Kontula, J.; Äkäslompolo, S.; Ikäheimo, A.; Lazerson, S.; Kurki-Suonio, T.; Hartmann, D.; Rust, N.; McNeely, P.; Kazakov, Ye O.; Ongena, J.; , W7-X Team
A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
In Wendelstein 7-X (W7-X), a new ion cyclotron resonance heating (ICRH) antenna will be commissioned during the operational campaign OP2.1. The antenna will have to sustain power loads not only from thermal plasma and radiation but also fast ions. Predictive simulations of fast-ion power loads to the antenna components are therefore important to establish safe operational limits. In this work, the fast-ion power loads from the W7-X neutral beam injection (NBI) system to the ICRH antenna was simulated using the ASCOT suite of codes. Five reference magnetic configurations and five antenna positions were considered to provide an overview of power load behavior under various operating conditions. The NBI power load was found to have an exponential dependence on the antenna insertion depth. Differences between magnetic configurations were significant, with the antenna limiter power load varying between 380 W and 100 kW depending on the configuration. Qualitative differences in power load patterns between configurations were also observed, with the low mirror and low iota configurations exhibiting higher loads to the sensitive antenna straps. The local fast-ion power flux to the antenna limiter was also considered and found to exceed the 2.0 MW m−2 steady-state safety limit only in specific cases. The NBI system might thus pose a safety concern to the ICRH antenna during concurrent NBI-ICRH operation, but additional heat propagation simulations of antenna components are needed to establish more realistic operational time limits.
XIPE: The X-ray imaging polarimetry explorer
(2016) Soffitta, P.; Bellazzini, R.; Bozzo, E.; Burwitz, V.; Castro-Tirado, A. J.; Costa, E.; Courvoisier, T.; Feng, H.; Gburek, S.; Goosmann, R.; Karas, V.; Matt, G.; Muleri, F.; Nandra, K.; Pearce, M.; Poutanen, J.; Reglero, V.; Sabau Maria, D.; Santangelo, A.; Tagliaferri, G.; Tenzer, C.; Vink, J.; Weisskopf, M. C.; Zane, S.; Agudo, I.; Antonelli, A.; Attina, P.; Baldini, L.; Bykov, A.; Carpentiero, R.; Cavazzuti, E.; Churazov, E.; Del Monte, E.; De Martino, D.; Donnarumma, I.; Doroshenko, V.; Evangelista, Y.; Ferreira, I.; Gallo, E.; Grosso, N.; Kaaret, P.; Kuulkers, E.; Laranaga, J.; Latronico, L.; Lumb, D. H.; Macian, J.; Malzac, J.; Marin, F.; Massaro, E.; Minuti, M.; Mundell, C.; Ness, J. U.; Oosterbroek, T.; Paltani, S.; Pareschi, G.; Perna, R.; Petrucci, P. O.; Pinazo, H. B.; Pinchera, M.; Rodriguez, J. P.; Roncadelli, M.; Santovincenzo, A.; Sazonov, S.; Sgro, C.; Spiga, D.; Svoboda, J.; Theobald, C.; Theodorou, T.; Turolla, R.; Wilhelmi De Ona, E.; Winter, B.; Akbar, A. M.; Allan, H.; Aloisio, R.; Altamirano, D.; Amati, L.; Amato, E.; Angelakis, E.; Arezu, J.; Atteia, J. L.; Axelsson, M.; Bachetti, M.; Ballo, L.; Balman, S.; Bandiera, R.; Barcons, X.; Basso, S.; Baykal, A.; Becker, W.; Behar, E.; Beheshtipour, B.; Belmont, R.; Berger, E.; Bernardini, F.; Bianchi, S.; Bisnovatyi-Kogan, G.; Blasi, P.; Blay, P.; Bodaghee, A.; Boer, M.; Boettcher, M.; Bogdanov, S.; Bombaci, I.; Bonino, R.; Braga, J.; Brandt, W.; Brez, A.; Bucciantini, N.; Burderi, L.; Caiazzo, I.; Campana, R.; Campana, S.; Capitanio, F.; Cappi, M.; Cardillo, M.; Casella, P.; Catmabacak, O.; Cenko, B.; Cerda-Duran, P.; Cerruti, C.; Chaty, S.; Chauvin, M.; Chen, Y.; Chenevez, J.; Chernyakova, M.; Cheung Teddy, C. C.; Christodoulou, D.; Connell, P.; Corbet, R.; Coti Zelati, F.; Covino, S.; Cui, W.; Cusumano, G.; D'Ai, A.; D'Ammando, F.; Dadina, M.; Dai, Z.; De Rosa, A.; De Ruvo, L.; Degenaar, N.; Del Santo, M.; Del Zanna, L.; Dewangan, G.; Di Cosimo, S.; Di Lalla, N.; Di Persio, G.; Di Salvo, T.; Dias, T.; Done, C.; Dovciak, M.; Doyle, G.; Ducci, L.; Elsner, R.; Enoto, T.; Escada, J.; Esposito, P.; Eyles, C.; Fabiani, S.; Falanga, M.; Falocco, S.; Fan, Y.; Fender, R.; Feroci, M.; Ferrigno, C.; Forman, W.; Foschini, L.; Fragile, C.; Fuerst, F.; Fujita, Y.; Gasent-Blesa, J. L.; Gelfand, J.; Gendre, B.; Ghirlanda, G.; Ghisellini, G.; Giroletti, M.; Goetz, D.; Gogus, E.; Gomez, J. L.; Gonzalez, D.; Gonzalez-Riestra, R.; Gotthelf, E.; Gou, L.; Grandi, P.; Grinberg, V.; Grise, F.; Guidorzi, C.; Gurlebeck, N.; Guver, T.; Haggard, D.; Hardcastle, M.; Hartmann, D.; Haswell, C.; Heger, A.; Hernanz, M.; Heyl, J.; Ho, L.; Hoormann, J.; Horak, J.; Huovelin, J.; Huppenkothen, D.; Iaria, R.; Inam Sitki, C.; Ingram, A.; Israel, G.; Izzo, L.; Burgess, M.; Jackson, M.; Ji, L.; Jiang, J.; Johannsen, T.; Jones, C.; Jorstad, S.; Kajava, J. J E; Kalamkar, M.; Kalemci, E.; Kallman, T.; Kamble, A.; Kislat, F.; Kiss, M.; Klochkov, D.; Koerding, E.; Kolehmainen, M.; Koljonen, K.; Komossa, S.; Kong, A.; Korpela, S.; Kowalinski, M.; Krawczynski, H.; Kreykenbohm, I.; Kuss, M.; Lai, D.; Lan, M.; Larsson, J.; Laycock, S.; Lazzati, D.; Leahy, D.; Li, H.; Li, J.; Li, L. X.; Li, T.; Li, Z.; Linares, M.; Lister, M.; Liu, H.; Lodato, G.; Lohfink, A.; Longo, F.; Luna, G.; Lutovinov, A.; Mahmoodifar, S.; Maia, J.; Mainieri, V.; Maitra, C.; Maitra, D.; Majczyna, A.; Maldera, S.; Malyshev, D.; Manfreda, A.; Manousakis, A.; Manuel, R.; Margutti, R.; Marinucci, A.; Markoff, S.; Marscher, A.; Marshall, H.; Massaro, F.; McLaughlin, M.; Medina-Tanco, G.; Mehdipour, M.; Middleton, M.; Mignani, R.; Mimica, P.; Mineo, T.; Mingo, B.; Miniutti, G.; Mirac, S. M.; Morlino, G.; Motlagh, A. V.; Motta, S. E.; Mushtukov, A.; Nagataki, S.; Nardini, F.; Nattila, J.; Navarro, G. J.; Negri, B.; Negro, M.; Nenonen, S.; Neustroev, V.; Nicastro, F.; Norton, A.; Nucita, A.; O'Brien, P.; O'Dell, S.; Odaka, H.; Olmi, B.; Omodei, N.; Orienti, M.; Orlandini, M.; Osborne, J.; Pacciani, L.; Paliya, V. S.; Papadakis, I.; Papitto, A.; Paragi, Z.; Pascal, P.; Paul, B.; Pavan, L.; Pellizzoni, A.; Perinati, E.; Pesce-Rollins, M.; Piconcelli, E.; Pili, A. G.; Pilia, M.; Pohl, Martin; Ponti, G.; Porquet, D.; Possenti, A.; Postnov, K.; Prandoni, I.; Produit, N.; Puehlhofer, G.; Ramsey, B.; Razzano, M.; Rea, N.; Reig, P.; Reinsch, K.; Reiprich, T.; Reynolds, M.; Risaliti, G.; Roberts, T.; Rodriguez, J.; Rossi, M. E.; Rosswog, S.; Rozanska, A.; Rubini, A.; Rudak, B.; Russell, D.; Ryde, F.; Sabatini, S.; Sala, G.; Salvati, M.; Sasaki, M.; Savolainen, T.; Saxton, R.; Scaringi, S.; Schawinski, K.; Schulz, N. S.; Schwope, A.; Severgnini, P.; Sharon, M.; Shaw, A.; Shearer, A.; Shesheng, X.; Shih, I. C.; Silva, K.; Silva, R.; Silver, E.; Smale, A.; Spada, F.; Spandre, G.; Stamerra, A.; Stappers, B.; Starrfield, S.; Stawarz, L.; Stergioulas, N.; Stevens, A.; Stiele, H.; Suleimanov, V.; Sunyaev, R.; Slowikowska, A.; Tamborra, F.; Tavecchio, F.; Taverna, R.; Tiengo, A.; Tolos, L.; Tombesi, F.; Tomsick, J.; Tong, H.; Torok, G.; Torres, D. F.; Tortosa, A.; Tramacere, A.; Trimble, V.; Trinchieri, G.; Tsygankov, S.; Tuerler, M.; Turriziani, S.; Ursini, F.; Uttley, P.; Varniere, P.; Vincent, F.; Vurgun, E.; Wang, C.; Wang, Z.; Watts, A.; Wheeler, J. C.; Wiersema, K.; Wijnands, R.; Wilms, J.; Wolter, A.; Wood, K.; Wu, K.; Wu, X.; Xiangyu, W.; Xie, F.; Xu, R.; Yan, S. P.; Yang, J.; Yu, W.; Yuan, F.; Zajczyk, A.; Zanetti, D.; Zanin, R.; Zanni, C.; Zappacosta, L.; Zdziarski, A. A.; Zech, A.; Zhang, H.; Zhang, S.; Zhang, W.; Zoghbi, A.
A4 Artikkeli konferenssijulkaisussa
XIPE, the X-ray Imaging Polarimetry Explorer, is a mission dedicated to X-ray Astronomy. At the time of writing XIPE is in a competitive phase A as fourth medium size mission of ESA (M4). It promises to reopen the polarimetry window in high energy Astrophysics after more than 4 decades thanks to a detector that efficiently exploits the photoelectric effect and to X-ray optics with large effective area. XIPE uniqueness is time-spectrally-spatially-resolved X-ray polarimetry as a breakthrough in high energy astrophysics and fundamental physics. Indeed the payload consists of three Gas Pixel Detectors at the focus of three X-ray optics with a total effective area larger than one XMM mirror but with a low weight. The payload is compatible with the fairing of the Vega launcher. XIPE is designed as an observatory for X-ray astronomers with 75 % of the time dedicated to a Guest Observer competitive program and it is organized as a consortium across Europe with main contributions from Italy, Germany, Spain, United Kingdom, Poland, Sweden.