Publications of J. Geiger

Zehrfeld, H. P.; Geiger, J.: Growth Rates of Resistive Ballooning Modes in ASDEX Upgrade and W7-AS. In: 24th European Physical Society Conference on Controlled Fusion and Plasma Physics, pp. 1561 - 1564 (Eds. Schittenhelm, M.; Bartiromo, R.; Wagner, F.). 24th EPS Conference on Controlled Fusion and Plasma Physics, Berchtesgaden, June 09, 1997 - June 13, 1997. European Physical Society, Geneva (1997)

Geiger, J.; Gresillon, D.; Weller, A.; Sitenko, A.; Jaenicke, R.; Zagorodny, A.; W7-AS-Team; NI-Team: Stability of W7-AS Configurations with Reduced Vacuum Magnetic Wall. 23rd EPS Conference on Controlled Fusion and Plasma Physics, Kiev (UA). ECA 20C, 2, pp. 491 - 494 (1996)

Holzhauer, E.; Gresillon, D.; Baldzuhn, J.; Sitenko, A.; Fiedler, S.; Zagorodny, A.; Geiger, J.; Hirsch, M.; Jaenicke, R.; Konrad, C. et al.; Weller, A.; W7-AS-Team; NI-Team: Edge Turbulence and Transport Barrier Associated with the H-Mode in the W7-AS Stellarator. 23rd EPS Conference on Controlled Fusion and Plasma Physics, Kiev (UA). ECA 20C, 2, pp. 467 - 470 (1996)

Penningsfeld, F.-P.; Geiger, J.; Ott, W.; Speth, E.; W7-AS-Team: 3 MW Neutral Injection into the Stellarator Wendelstein 7-AS- Heating Efficiency at High-Beta Operation. In: 23rd European Physical Society Conference on Controlled Fusion and Plasma Physics, pp. 483 - 486 (Eds. Gresillon, D.; Sitenko, A.; Zagorodny, A.). 23rd EPS Conference on Controlled Fusion and Plasma Physics, Kiev (UA), June 24, 1996 - June 28, 1996. European Physical Society, Geneva (1996)

Beidler, C. D.; Geiger, J.; Kißlinger, J.; Maaßberg, H.: Neoclassically optimized configurations in W7-AS. In: Proceedings of the 10th International Conference on Stellarators, pp. 326 - 329 (Eds. Ascasibar, E.; Aradna, D.). 10th International Conference on Stellarators, Madrid, May 22, 1995 - May 26, 1995. (1995)

Beidler, C. D.; Kick, M.; Baldzuhn, J.; Geiger, J.; Kislyakov, A. I.; Kißlinger, J.; Kühner, G.; Maaßberg, H.; Ohlendorf, W.; Penningsfeld, F.-P. et al.; Rust, N.; W7-AS Team, Max Planck Institute for Plasma Physics, Max Planck Society; W7-X ECRH Team, Max Planck Institute for Plasma Physics, Max Planck Society: Ion Confinement in "Transport Optimized" Configurations of the Stellarator W7-AS. In: Proceedings of the 10th International Conference on Stellarators, Vol. 1, pp. 330 - 333 (Eds. Ascasibar, E.; Aradna, D.). 10th International Conference on Stellarators, Madrid, May 22, 1995 - May 26, 1995. (1995)

Geiger, J.; Weller, A.; Kühner, G.; W7-AS Team, Max Planck Institute for Plasma Physics, Max Planck Society: Stability Analysis of Low Configurations with Different Toroidal Ripples in W7-AS. In: Proceedings of the 10th International Conference on Stellarators, pp. 57 - 60 (Eds. Ascasibar, E.; Aradna, D.). 10th International Conference on Stellarators, Madrid, May 22, 1995 - May 26, 1995. (1995)

Rau, F.; Beidler, C. D.; Erckmann, V.; Geiger, J.; Grigull, P.; Harmeyer, E.; Hofmann, J.; Kick, M.; Kißlinger, J.; Kühner, G. et al.; Ringler, H.; Wobig, H.; W7-AS Team, Max Planck Institute for Plasma Physics, Max Planck Society; W7-X ECRH Team, Max Planck Institute for Plasma Physics, Max Planck Society: W7-AS with Modified Mirror Ratio – Review of Recent Experiments. In: Proceedings of the 10th International Conference on Stellarators, pp. 26 - 29 (Eds. Ascasibar, E.; Aradna, D.). 10th International Conference on Stellarators, Madrid, May 22, 1995 - May 26, 1995. (1995)

Weller, A.; Geiger, J.; Spong, D.A.; Hartfuss, H.-J.; Hirsch, M.; Jaenicke, R.; Konrad, C.; Penningsfeld, F.P.; Sattler, S.; W7-AS-Team et al.; NBI-Group: Pressure and Energetic Particle Destabilized Global MHD Modes in the Stellarator W7-AS: 15. Conference Proceedings. In: Plasma Physics and Controlled Nuclear Fusion Research, Vol. 1, pp. 791 - 796. Plasma Physics and Controlled Nuclear Fusion Research, Vol. 1, Seville (ES). (1995)

Geiger, J.; Weller, A.; Rau, F.; W7-AS, Max Planck Institute for Plasma Physics, Max Planck Society; NBI-Team: Stability Analysis of Pressure Driven Modes in Wendelstein 7-AS. In: ECA, Vol. 18B, Part 1, pp. 372 - 375 (Eds. Joffrin, E.; Platz, P.; Stott, P. E.). 21st EPS Conference on Controlled Fusion and Plasma Physics, Montpellier, June 27, 1994 - July 01, 1994. European Physical Society, Geneva (1994)

Hofmann, J.V.; Ida, K.; Geiger, J.; Rau, F.; Baldzuhn, J.; Field, A.R.; Kick, M.; Kuehner, G.; Penningsfeld, F.-P.; Ott, W. et al.; Ringler, H.; W7-AS, Max Planck Institute for Plasma Physics, Max Planck Society; ECRH-Group; NI-Group: Toroidal and Poloidal Rotation in the W7-AS Stellarator. In: ECA, Vol. 18B, Part 1, pp. 392 - 395 (Eds. Joffrin, E.; Platz, P.; Stott, P. E.). 21st EPS Conference on Controlled Fusion and Plasma Physics, Montpellier, June 27, 1994 - July 01, 1994. European Physical Society, Geneva (1994)

Rau, F.; Beidler, C.D.; Brakel, R.; Geiger, J.; Grigull, P.; Harmeyer, E.; Herre, G.; Hofmann, J.V.; Kick, M.; Kisslinger, J. et al.; Kuehner, G.; Mandl, W.; Niedermeyer, H.; Ringler, H.; Walter, H.; Wobig, H.; WVII-AS-Team; ECRH-Group; NBI-Group: Extended Parameter Range in W 7-AS Experiments at Various Values of the Mirror Ratio. In: ECA, Vol. 18B, Part 1, pp. 400 - 403 (Eds. Joffrin, E.; Platz, P.; Stott, P. E.). 21st EPS Conference on Controlled Fusion and Plasma Physics, Montpellier, June 27, 1994 - July 01, 1994. European Physical Society, Geneva (1994)

Beidler, C. D.; Gasparino, U.; Geiger, J.; Harmeyer, E.; Kisslinger, J.; Kuehner, G.; Rau, F.; Ringler, H.; Wobig, H.; W7-AS, Max Planck Institute for Plasma Physics, Max Planck Society et al.; ECRH-Group: Wendelstein 7-AS Configurations at Various Mirror Ratios and iota-Values. In: ECA, Vol. 17C, Part 1, pp. 341 - 344 (Eds. Cabral, J. A. C.; Manso, M. E.; Serra, F. M.). 20th EPS Conference on Controlled Fusion and Plasma Physics, Lisbon, July 26, 1993 - July 30, 1993. European Physical Society, Geneva (1993)

Beidler, C.D.; Gasparino, U.; Geiger, J.; Harmeyer, E.; Kisslinger, J.; Kuehner, G.; Rau, F.; Ringler, H.; Wobig, H.; WVII-AS-Team et al.; ECRH-Group: Wendelstein 7-AS Configurations at Various Mirror Ratios and t-Values. In: 9.International Workshop on Stellarators, pp. 84 - 95. 9.International Workshop on Stellarators, Garching (DE). (1993)

Beidler, C. D.; Gasparino, U.; Geiger, J.; Harmeyer, E.; Kißlinger, J.; Kühner, G.; Rau, F.; Ringler, H.; Wobig, H.; W7-AS Team, Max Planck Institute for Plasma Physics, Max Planck Society et al.; W7-X ECRH Team, Max Planck Institute for Plasma Physics, Max Planck Society: Wendelstein 7-AS Configurations at Various Mirror Ratios and t-Values. In: A Collection of Papers Presented at the IAEA Technical Committee Meeting on Stellarators and other Helical Confinement Systems, pp. 84 - 95. 9th International Workshop on Stellarators, Garching , May 10, 1993 - May 14, 1993. International Atomic Energy Agency, Vienna (1993)

Geiger, J.; WVII-AS-Team: W7-AS Equilibria with Toroidal Current. In: A Collection of Papers Presented at the IAEA Technical Committee Meeting on Stellarators and other Helical Confinement Systems, pp. 222 - 226. 9th International Workshop on Stellarators, Garching, May 10, 1993 - May 14, 1993. International Atomic Energy Agency, Vienna (1993)

Kick, M.; Baldzuhn, J.; Ballico, S.D.; Bomba, B.; Brakel, R.; Buechse, R.; Burhenn, R.; Cattanei, G.; Dohdy, A.; Dorst, D. et al.; Elsner, A.; Endler, M.; Engelhardt, K.; Erckmann, V.; Gasparino, U.; Geiger, J.; Geissler, S.; Geist, T.; Giannone, L.; Grigull, P.; Hacker, H.; Hartfuss, H.J.; Heinrich, O.; Herre, G.; et al.: Experimental Status of the "Advanced Stellarator" W7-AS. In: Jahrestagung Kerntechnik '93, pp. 25 - 28. Jahrestagung Kerntechnik '93, Bonn Koeln (DE). Inforum Verlags- u. Verwaltungsges. (1993)

Knieps, A.; Liang, Y.; Suzuki, Y.; Killer, C.; Grulke, O.; Jakubowski, M.; Niemann, H.; Gao, Y.; Neubauer, O.; Satheeswaran, G. et al.; Drews, P.; Nicolai, D.; Geiger, J.; Endler, M.; W7-X Team, Max Planck Institute for Plasma Physics, Max Planck Society: Plasma beta effects on the island divertor of Wendelstein 7-X. In: Verhandlungen der Deutschen Physikalischen Gesellschaft, (VI) 55 (1), P 10.6. DPG-Frühjahrstagung der Sektion Atome, Moleküle, Quantenoptik und Plasmen (SAMOP), Hannover, March 08, 2020 - March 13, 2020. DPG, Bad Honnef (submitted)

Aleynikova, K.; Ramasamy, R.; Nikulsin, N.; Geiger, J.; Zocco, A.; Hindenlang, F.; Hoelzl, M.; JOREK Team: Exploring sawtooth-like crashes triggered by current drive in Wendelstein 7-X. 2nd European Conference on Magnetic Reconnection in Plasmas (ECMRP 2025), Torino (2025)

Bozhenkov, S. A.; Ford, O.; Wappl, M.; Bannmann, S.; Romba, T.; Perseo, V.; Zhang, D.; Aleynikova, K.; Mohammed, A.; Amri, I. et al.; Baehner, J.P.; Baldzuhn, J.; Baylor, L.; Boumendjel, Y.; Brandt, C.; Brunner, K. J.; Bueschel, C.; Carralero, D.; Dinklage, A.; Estrada, T.; Fuchert, G.; Gao, Y.; Geiger, J.; Gonda, T.; Gradic, D.; Hammond, K.; Hartmann, D.; Hirsch, M.; Jakubowski, M.; Knauer, J.; Knieps, A.; Kriete, M.; Krychowiak, M.; Langenberg, A.; Laqua, H.; Cansino, R. L.; Louwe, J.; Maragkoudakis, M.; McNeely, P.; Moseev, D.; Naujoks, D.; Pablant, N.; Alvarez, N. P.; Pasch, E.; Poloskei, P.; Proll, J.; Rahbarnia, K.; Reimold, F.; Rust, N.; Schmidt, G.; Siddiki, M.; Smith, H.; Stange, T.; Tamura, N.; Thomsen, H.; Tsikouras, A.; Vecsei, M.; Villalobos Granados, E.; Stechow, A. v.; Wagner, J.; Xanthopoulos, P.; Zanini, M.; Wolf, R.; W7-X Team, Max Planck Institute for Plasma Physics, Max Planck Society: Routes to high-performance operation in Wendelstein 7-X (W7-X): turbulence suppression with shaping of the density profile. 51st EPS Conference on Plasma Physics, Vilnius (submitted)