@article{MTMT:2211222, title = {Experimental results with an optimized magnetic field configuration for JET breakdown}, url = {https://m2.mtmt.hu/api/publication/2211222}, author = {Albanese, R and Maviglia, F and Lomas, PJ and Manzanares, A and Mattei, M and Neto, A and Rimini, FG and de Vries, PC}, doi = {10.1088/0029-5515/52/12/123010}, journal-iso = {NUCL FUSION}, journal = {NUCLEAR FUSION}, volume = {52}, unique-id = {2211222}, issn = {0029-5515}, year = {2012}, eissn = {1741-4326} } @article{MTMT:1847524, title = {Electromagnetic analysis of breakdown conditions in JET}, url = {https://m2.mtmt.hu/api/publication/1847524}, author = {Maviglia, F and Albanese, R and Alonso, A and Lomas, PJ}, doi = {10.1016/j.fusengdes.2010.12.042}, journal-iso = {FUSION ENG DES}, journal = {FUSION ENGINEERING AND DESIGN}, volume = {86}, unique-id = {1847524}, issn = {0920-3796}, abstract = {This paper presents the breakdown studies carried out in the framework of JET Enhancement Projects for Plasma Control Upgrade (PCU) and Enhanced Radial Field Amplifier (ERFA), to obtain plasma formation with different sets of coil turns in the radial field circuit. The electromagnetic conditions to reach the plasma breakdown in the JET machine are strongly dependent on the properties of JET iron core and the effects of the eddy currents driven by the transient electric field on the present passive structures. The study has been carried out by using a linearized dynamic model of JET provided by 2D axisymmetric finite element code CREATE-L [R. Albanese, et al., Nucl. Fusion 38 (1998) 723-738]. The dynamic simulations have been compared with the experimental data. A new fast visible camera has been installed and has been used for the first time at JET for studies of plasma breakdown. The images show, coherently with the model, that the avalanche evolves dynamically towards a region where the stray field is perpendicular to the first wall. (C) 2010 EURATOM. Published by Elsevier B.V. All rights reserved.}, year = {2011}, eissn = {1873-7196}, pages = {675-679} } @article{MTMT:1451487, title = {Experimental studies of ITER demonstration discharges}, url = {https://m2.mtmt.hu/api/publication/1451487}, author = {Sips, ACC and Casper, TA and Doyle, EJ and Giruzzi, G and Gribov, Y and Hobirk, J and Hogeweij, GMD and Horton, LD and Hubbard, AE and Hutchinson, I and Ide, S and Isayama, A and Imbeaux, F and Jackson, GL and Kamada, Y and Kessel, C and Kochl, F and Lomas, P and Litaudon, X and Luce, TC and Marmar, E and Mattei, M and Nunes, I and Oyama, N and Parail, V and Portone, A and Saibene, G and Sartori, R and Stober, JK and Suzuki, T and Wolfe, SM and Anda, Gábor and Dunai, Dániel and Gál-Hobirk, Kinga Izabella and Kálvin, Sándor Csaba and Kocsis, Lajos Gábor and Petravich, Gábor Tamás and Szepesi, Tamás Zoltán and Zoletnik, Sándor and Mayer, M and Andrzejczuk, M and Dux, R and Fortuna-Zalesna, E and Hakola, A and Koivuranta, S and Krieger, K and Kurzydlowski, KJ and Likonen, J and Matern, G and Neu, R and Ramos, G and Rasinski, M and Rohde, V and Sugiyama, K and Wiltner, A and Zielinski, W and Kallenbach, A and Adamek, J and Aho-Mantila, L and Äkäslompolo, S and Angioni, C and Atanasiu, C V and Balden, M and Behler, K and Belonohy, E and Bergmann, A and Bernert, M and Bilato, R and Bobkov, V and Boom, J and Bottino, A and Braun, F and Brüdgam, M and Buhler, A and Burckhart, A and Chankin, A and Classen, I G J and Conway, G D and Coster, D P and de Marné, P and D'Inca, R and Drube, R and Dux, R and Eich, T and Endstrasser, N and Engelhardt, K and Esposito, B and Fable, E and Fahrbach, H -U and Fattorini, L and Fischer, R and Flaws, A and Fünfgelder, H and Fuchs, J C and García, Muñoz M and Geiger, B and Gemisic, Adamov M and Giannone, L and Giroud, C and Görler, T and da Graca, S and Greuner, H and Gruber, O and Gude, A and Günter, S and Haas, G and Hakola, A H and Hangan, D and Happel, T and Hauff, T and Heinemann, B and Herrmann, A and Hicks, N and Hobirk, J and Höhnle, H and Hölzl, M and Hopf, C and Horton, L and Huart, M and Igochine, V and Ionita, C and Janzer, A and Jenko, F and Käsemann, C -P and Kardaun, O and Kaufmann, M and Kirk, A and Klingshirn, H -J and Kocan, M and Kollotzek, H and Konz, C and Koslowski, R and Krieger, K and Kurki-Suonio, T and Kurzan, B and Lackner, K and Lang, P T and Lauber, P and Laux, M and Leipold, Frank and Leuterer, F and Lohs, A and Luhmann, N C Jr and Lunt, T and Lyssoivan, A and Maier, H and Maggi, C and Mank, K and Manso, M -E and Maraschek, M and Martin, P and Mayer, M and McCarthy, P J and McDermott, R and Meister, H and Menchero, L and Meo, Fernando and Merkel, P and Merkel, R and Mertens, V and Merz, F and Mlynek, A and Monaco, F and Müller, H W and Münich, M and Murmann, H and Neu, G and Neu, R and Nold, B and Noterdaeme, J -M and Park, H K and Pautasso, G and Pereverzev, G and Podoba, Y and Pompon, F and Poli, E and Polochiy, K and Potzel, S and Prechtl, M and Püschel, M J and Pütterich, T and Rathgeber, S K and Raupp, G and Reich, M and Reiter, B and Ribeiro, T and Riedl, R and Rohde, V and Roth, J and Rott, M and Ryter, F and Sandmann, W and Santos, J and Sassenberg, K and Sauter, P and Scarabosio, A and Schall, G and Schmid, K and Schneider, P A and Schneider, W and Schramm, G and Schrittwieser, R and Schweinzer, J and Scott, B and Sempf, M and Serra, F and Sertoli, M and Siccinio, M and Sigalov, A and Silva, A and Sips, A C C and Sommer, F and Stäbler, A and Stober, J and Streibl, B and Strumberger, E and Sugiyama, K and Suttrop, W and Tardini, G and Tichmann, C and Told, D and Treutterer, W and Urso, L and Varela, P and Vincente, J and Vianello, N and Vierle, T and Viezzer, E and Vorpahl, C and Wagner, D and Weller, A and Wenninger, R and Wieland, B and Wigger, C and Willensdorfer, M and Wischmeier, M and Wolfrum, E and Würsching, E and Yadikin, D and Yu, Q and Zammuto, I and Zasche, D and Zehetbauer, T and Zhang, Y and Zilker, M and Zohm, H}, doi = {10.1088/0029-5515/49/8/085015}, journal-iso = {NUCL FUSION}, journal = {NUCLEAR FUSION}, volume = {49}, unique-id = {1451487}, issn = {0029-5515}, abstract = {Key parts of the ITER scenarios are determined by the capability of the proposed poloidal field (PF) coil set. They include the plasma breakdown at low loop voltage, the current rise phase, the performance during the flat top (FT) phase and a ramp down of the plasma. The ITER discharge evolution has been verified in dedicated experiments. New data are obtained from C-Mod, ASDEX Upgrade, DIII-D, JT-60U and JET. Results show that breakdown for E-axis < 0.23-0.33 V m(-1) is possible unassisted (ohmic) for large devices like JET and attainable in devices with a capability of using ECRH assist. For the current ramp up, good control of the plasma inductance is obtained using a full bore plasma shape with early X-point formation. This allows optimization of the flux usage from the PF set. Additional heating keeps l(i)(3) < 0.85 during the ramp up to q(95) = 3. A rise phase with an H-mode transition is capable of achieving l(i)(3) < 0.7 at the start of the FT. Operation of the H-mode reference scenario at q(95) similar to 3 and the hybrid scenario at q(95) = 4-4.5 during the FT phase is documented, providing data for the l(i) (3) evolution after the H-mode transition and the li (3) evolution after a back-transition to L-mode. During the ITER ramp down it is important to remain diverted and to reduce the elongation. The inductance could be kept <= 1.2 during the first half of the current decay, using a slow I-p ramp down, but still consuming flux from the transformer. Alternatively, the discharges can be kept in H-mode during most of the ramp down, requiring significant amounts of additional heating.}, year = {2009}, eissn = {1741-4326} }