Plasmadynamik und -diagnostik

Plasmaturbulenz, Wellen im Plasma, magnetischer Einschluss, Experimente am Torsatron TJ-K und Tokamak ASDEX Upgrade, Laborplasmen, Fusionsforschung

Forschungsschwerpunkte

Die Forschungsgruppe Plasmadynamik- und diagnostik befasst sich mit Fragestellungen der Fusionsforschung sowie grundlegenden Problemen von Laborplasmen.

Experimente und Computersimulationen werden zum Thema Energie- und Teilchentransport in Fusionsplasmen durchgeführt. Ziel ist ein besseres Verständnis der durch Plasmaturbulenz bedingten Verluste in toroidal eingeschlossenen Plasmen, die letztlich die Ökonomie eines Fusionskraftwerkes bestimmen.

Elektromagnetische Wellen werden in vielfältiger Weise zur Heizung und Diagnostik von Plasmen eingesetzt. In Experiment und Simulation werden die physikalischen Grundlagen von Propagation, Modenkonversion und Absorption der Wellen in magnetisierten und unmagnetisierten Plasmen untersucht.

Experimentiert wird am Torsatron TJ-K und dem großen Tokamak ASDEX Upgrade des MPI für Plasmaphysik (IPP) in Garching, sowie an der eigenen linearen Plasmaanlage FLIPS. Die Arbeiten umfassen den Bau von Diagnostiken, Planung und Durchführung der Experimente sowie die Anwendung moderner Analysetechniken auf die Daten.

Begleitend werden massive Computersimulationen angestellt. Dazu verfügt das Institut über den 3-dimensionalen Code IPF-FD3D für elektromagnetische Wellen im Plasma, über einen PIC-Code für die Interpretation von Plasmawellen und Plasmarandschicht, sowie den Plasmaturbulenzcode GEM3 des IPP zur Simulation der Plasmaturbulenz.

Experimente und Simulationscodes

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Publikationen

  1. 2025

    1. A. Köhn-Seemann and R. B. Morales, “From electron cyclotron emission and reflectometry to microwave imaging diagnostics in fusion plasmas: Progress and perspectives,” Physics of Plasmas, vol. 32, Art. no. 6, Jun. 2025, doi: 10.1063/5.0259713.
    2. R. Sarkis, G. E. M. Tovar, and M. Ramisch, “Transport regulation and energy transfer dynamics during zonal flow formation,” Nucl. Fusion, vol. 66, Art. no. 1, 2025, doi: 10.1088/1741-4326/ae2525.
    3. R. Sarkis, N. Dumerat, B. Schmid, G. E. M. Tovar, and M. Ramisch, “Interplay of turbulent transport and Reynolds stress in drift-wave turbulence,” Phys. Rev. E, vol. 111, Art. no. 4, 2025, doi: 10.1103/PhysRevE.111.045207.
    4. N. Dumérat, R. Sarkis, G. E. M. Tovar, and M. Ramisch, “Causal coupling of edge-SOL coherent structures with zonal flows,” Plasma Phys. Control. Fusion, vol. 67, Art. no. 11, 2025, doi: 10.1088/1361-6587/ae1530.
    5. C. Vagkidis et al., “Advanced microwave method for electron density profile reconstruction of an atmospheric plasma torch,” Plasma Sources Sci. Technol., vol. 34, Art. no. 10, 2025, doi: 10.1088/1361-6595/ae0762.
    6. R. Sarkis, G. E. M. Tovar, and M. Ramisch, “Turbulence Regulation and Energy Transfer Dynamics During Zonal Flow Formation,” in Proc. of the 51st EPS Conference on Plasma Physics, Vilnius, Lithuania, 2025. [Online]. Available: https://lac913.epfl.ch/epsppd3/2025/html/PDF/P1-044.pdf
    7. C. Vagkidis, S. Majumder, M. Ramisch, G. E. M. Tovar, and A. Köhn-Seemann, “Numerical investigation of the O-X mode conversion in a tokamak plasma,” in Proc. of the 51st EPS Conference on Plasma Physics, Vilnius, Lithuania, 2025. [Online]. Available: https://lac913.epfl.ch/epsppd3/2025/html/PDF/P4-280.pdf

  2. 2024

    1. J. Joshi-Thompson and M. Ramisch, “A neural network for the analysis of Langmuir-probe characteristics,” Plasma Phys. Control. Fusion, vol. 66, Art. no. 10, Sep. 2024, doi: 10.1088/1361-6587/ad7289.
    2. C. Vagkidis, E. Holzhauer, A. Köhn-Seemann, M. Ramisch, and G. Tovar, “Numerical investigation of the ELM effect on microwave propagation,” in Proc. of the 50th EPS Conference on Plasma Physics, Salamanca, Spain, 2024. [Online]. Available: https://lac913.epfl.ch/epsppd3/2024/html/PDF/P5-033.pdf
    3. A. Köhn-Seemann et al., “EBW Experiments on the TJ-K Stellarator,” Jan. 2024, [Online Video]. Available: https://ukaeaevents.com/uk-microwaves-in-beams-and-plasmas/

  3. 2023

    1. L. A. Holland, A. Köhn-Seemann, and R. G. L. Vann, “Parametric dependence of microwave beam broadening by plasma density turbulence,” Nuclear Fusion, May 2023, doi: 10.1088/1741-4326/acc25e.
    2. M. W. Brookman et al., “Broadening of microwave heating beams in the DIII-D tokamak by edge turbulence,” Nuclear Fusion, vol. 63, Art. no. 4, Mar. 2023, doi: 10.1088/1741-4326/acbb8e.
    3. A. J. Coelho et al., “Validation of GBS plasma turbulence simulation of the TJ-K stellarator,” Plasma Phys. Control. Fusion, vol. 65, Art. no. 8, 2023, doi: 10.1088/1361-6587/ace4f3.
    4. N. Müller, P. Manz, and M. Ramisch, “Nondiffusive particle transport in the stellarator experiment TJ-K,” Phys. Plasmas, vol. 30, Art. no. 9, 2023, doi: 10.1063/5.0156125.
    5. A. Köhn-Seemann, B. E. Eliasson, S. J. Freethy, L. A. Holland, and R. G. L. Vann, “Benchmarking full-wave codes for studying the O-SX mode conversion in MAST Upgrade,” in EPJ Web of Conferences, 2023, p. 1010. doi: 10.1051/epjconf/202327701010.
    6. N. Dumérat, M. Ramisch, B. Schmid, and G. E. M. Tovar, “Investigation of the coupling between zonal flow activity and multi-scale turbulent phenomena at the stellarator TJ-K,” in Proc. of the 49th EPS Conference on Plasma Physics, Bordeaux, France, 2023. [Online]. Available: https://lac913.epfl.ch/epsppd3/2023/html/Fr/Fr_MCF65_Dumerat.pdf
    7. T. Wilson et al., “Electron Bernstein Wave (EBW) Current Drive Profiles and Efficiency for STEP,” in EPJ Web of Conferences, E. Poli, Y. Liu, and V. Udintsev, Eds., 2023, p. 1011. doi: 10.1051/epjconf/202327701011.
    8. S. Freethy et al., “Microwave Current Drive for STEP and MAST Upgrade,” in EPJ Web of Conferences, E. Poli, Y. Liu, and V. Udintsev, Eds., 2023, p. 4001. doi: 10.1051/epjconf/202327704001.
    9. C. Vagkidis et al., “Full-wave investigation of microwave propagation through plasma density inhomogeneities,” in Proc. of the 49th EPS Conference on Plasma Physics, Bordeaux, France, 2023.

  4. 2022

    1. A. Köhn-Seemann et al., “Plasma electron acceleration in a non-resonant microwave heating scheme below the electron cyclotron frequency,” New Journal of Physics, Jun. 2022, doi: 10.1088/1367-2630/ac747a.
    2. A. Köhn-Seemann et al., “Plasma electron acceleration in a non-resonant microwave heating scheme below the electron cyclotron frequency,” New J. Phys., vol. 24, Art. no. 6, 2022, doi: 10.1088/1367-2630/ac747a.
    3. U. Stroth and ASDEX Upgrade Team, “Progress from ASDEX Upgrade experiments in preparing the physics basis of ITER operation and DEMO scenario development,” Nucl. Fusion, vol. 62, Art. no. 4, 2022, doi: 10.1088/1741-4326/ac207f.

  5. 2021

    1. T. Ullmann, B. Schmid, P. Manz, G. E. M. Tovar, and M. Ramisch, “Turbulent energy transfer into zonal flows from the weak to the strong flow shear regime in the stellarator TJ-K,” Physics of Plasmas, vol. 28, Art. no. 5, May 2021, doi: 10.1063/5.0039959.

  6. 2020

    1. T. Ullmann, B. Schmid, P. Manz, B. van Milligen, G. E. M. Tovar, and M. Ramisch, “Experimental observation of resonance manifold shrinking under zonal flow shear,” Physical Review E, vol. 102, Art. no. 6, Dec. 2020, doi: 10.1103/physreve.102.063201.
    2. S. Garland, P. Manz, and M. Ramisch, “The influence of magnetic field curvature on intermittency in drift-wave turbulence in the stellarator TJ-K,” Physics of Plasmas, vol. 27, Art. no. 5, May 2020, doi: 10.1063/5.0004963.

  7. 2019

    1. T. Ullmann, P. Manz, B. Schmid, and M. Ramisch, “Shrinking of resonant manifold under flow shear at the stellarator TJ-K,” 46th EPS Conference on Plasma Physics, EPS 2019, 2019.

  8. 2018

    1. P. Manz et al., “Magnetic configuration effects on the Reynolds stress in the plasma edge,” Physics of Plasmas, vol. 25, Art. no. 7, Jul. 2018, doi: 10.1063/1.5037511.
    2. A. Köhn et al., “Microwave beam broadening due to turbulent plasma density fluctuations within the limit of the Born approximation and beyond,” Plasma Physics and Controlled Fusion, Apr. 2018, doi: 10.1088/1361-6587/aac000.
    3. A. Snicker et al., “The effect of density fluctuations on electron cyclotron beam broadening and implications for ITER,” Nuclear Fusion, vol. 58, Art. no. 1, 2018, doi: 10.1088/1741-4326/aa8d07.
    4. T. Ullmann, P. Manz, B. Schmid, and M. Ramisch, “Enhancement of zonal flow drive through equilibrium shear flows,” in Proc. of the 45th EPS Conference on Plasma Physics, Prague, Czech Republic, 2018.

  9. 2017

    1. S. Garland, K. Reuther, M. Ramisch, and P. Manz, “The collisionality dependence of intermittency level in drift-wave turbulence in the stellarator TJ-K,” Physics of Plasmas, vol. 24, Art. no. 11, Nov. 2017, doi: 10.1063/1.4991609.
    2. A. Snicker et al., “Interaction of the electron density fluctuations with electron cyclotron waves from the equatorial launcher in ITER,” Plasma Physics and Controlled Fusion, vol. 60, Art. no. 1, Nov. 2017, doi: 10.1088/1361-6587/aa8f1a.
    3. B. Schmid, P. Manz, M. Ramisch, and U. Stroth, “Spatio-temporal structure of turbulent Reynolds stress zonal flow drive in 3D magnetic configuration,” New Journal of Physics, vol. 19, Art. no. 5, May 2017, doi: 10.1088/1367-2630/aa67af.
    4. B. Schmid, P. Manz, M. Ramisch, and U. Stroth, “Collisional Scaling of the Energy Transfer in Drift-Wave Zonal Flow Turbulence,” Physical Review Letters, vol. 118, Art. no. 5, Jan. 2017, doi: 10.1103/physrevlett.118.055001.
    5. P. Manz et al., “Magnetic configuration effects on the radial electric field and the Reynolds stress in the plasma edge,” 44th EPS Conference on Plasma Physics, EPS 2017, 2017.
    6. X. Yang et al., “Simulations of High Harmonic Fast Wave Heating on the C-2U Advanced Beam-Driven Field-Reversed Configuration Device,” EPJ Web of Conferences, vol. 157, p. 3065, 2017, doi: 10.1051/epjconf/201715703065.
    7. G. Sichardt, L. Bock, E. Holzhauer, A. Kohn, M. Ramisch, and T. Hirth, “Electron cyclotron emission measurements at the optically thin plasmas of the stellarator TJ-K,” 44th EPS Conference on Plasma Physics, EPS 2017, 2017.
    8. G. Sichardt, E. Holzhauer, A. Köhn, M. Ramisch, and T. Hirth, “Electron cyclotron emission measurements at the optically thin plasmas of the stellarator TJ-K,” in Proc. of the 44th EPS Conference on Plasma Physics, Belfast, Northern Ireland, 2017.

  10. 2016

    1. C. Hidalgo, J. Talmadge, and M. Ramisch, “Advancing the understanding of plasma transport in mid-size stellarators,” Plasma Physics and Controlled Fusion, vol. 59, Art. no. 1, Nov. 2016, doi: 10.1088/0741-3335/59/1/014051.
    2. G. Fuchert, G. Birkenmeier, M. Ramisch, and U. Stroth, “Characterization of the blob generation region and blobby transport in a stellarator,” Plasma Physics and Controlled Fusion, vol. 58, Art. no. 5, Apr. 2016, doi: 10.1088/0741-3335/58/5/054005.
    3. S. Garland, G. Fuchert, M. Ramisch, and T. Hirth, “The structure and poloidal dynamics of blob filaments in TJ-K,” Plasma Physics and Controlled Fusion, vol. 58, Art. no. 4, Mar. 2016, doi: 10.1088/0741-3335/58/4/044012.
    4. S. Garland, G. Fuchert, M. Ramisch, and T. Hirth, “The effect of magnetic field geometry on filamentary plasma structures in TJ-K,” 43rd European Physical Society Conference on Plasma Physics, EPS 2016, 2016.

  11. 2015

    1. B. Schmid, P. Manz, M. Ramisch, and U. Stroth, “Investigation of the energy transfer to zonal flows at the stellarator TJ-K,” 42nd European Physical Society Conference on Plasma Physics, EPS 2015, 2015.
    2. S. Garland, M. Ramisch, and T. Hirth, “Effect of magnetic field geometry on blob structure and dynamics in TJ-K,” 42nd European Physical Society Conference on Plasma Physics, EPS 2015, 2015.
    3. A. Köhn et al., “Influence of density fluctuations on the O-X mode conversion and on microwave propagation,” in EPJ Web of Conferences: EC18 - 18th Joint Workshop on Electron Cyclotron Emission and Electron Cyclotron Resonance Heating, Nara, Japan, 2015.

  12. 2014

    1. B. Nold et al., “Turbulent transport across shear layers in magnetically confined plasmas,” Physics of Plasmas, vol. 21, Art. no. 10, Oct. 2014, doi: 10.1063/1.4897312.
    2. G. Fuchert et al., “Blob properties in L- and H-mode from gas-puff imaging in ASDEX upgrade,” Plasma Physics and Controlled Fusion, vol. 56, Art. no. 12, Oct. 2014, doi: 10.1088/0741-3335/56/12/125001.
    3. P. Simon et al., “Scaling and transport analyses based on an international edge turbulence database,” Plasma Physics and Controlled Fusion, vol. 56, Art. no. 9, Jul. 2014, doi: 10.1088/0741-3335/56/9/095015.
    4. B. Ph. van Milligen, G. Birkenmeier, M. Ramisch, T. Estrada, C. Hidalgo, and A. Alonso, “Causality detection and turbulence in fusion plasmas,” Nuclear Fusion, vol. 54, Art. no. 2, Feb. 2014, doi: 10.1088/0029-5515/54/2/023011.
    5. B. Schmid, M. Ramisch, and U. Stroth, “Zonal flow formation in the stellarator TJ-K,” in Proc. of the 41st EPS Conference on Plasma Physics, Berlin, Germany, 2014.
    6. A. Köhn, E. Holzhauer, R. B. Morales, S. Wolf, and M. Ramisch, “Microwave heating by electron Bernstein waves at the stellarator TJ-K,” in Proc. of the 41st EPS Conference on Plasma Physics, Berlin, Germany, 2014.
    7. G. Fuchert et al., “Blob properties in L- and H-mode plasmas of ASDEX Upgrade,” in Proc. of the 41st EPS Conference on Plasma Physics, Berlin, Germany, 2014.
    8. G. Fuchert et al., “Blob properties in L- and H-mode plasmas of ASDEX Upgrade,” in Proc. of the 41st EPS Conference on Plasma Physics, Berlin, Germany, 2014.

  13. 2013

    1. G. Fuchert, G. Birkenmeier, B. Nold, M. Ramisch, and U. Stroth, “The influence of plasma edge dynamics on blob properties in the stellarator TJ-K,” Plasma Physics and Controlled Fusion, vol. 55, Art. no. 12, Oct. 2013, doi: 10.1088/0741-3335/55/12/125002.
    2. G. Birkenmeier, M. Ramisch, B. Schmid, and U. Stroth, “Experimental Evidence of Turbulent Transport Regulation by Zonal Flows,” Physical Review Letters, vol. 110, Art. no. 14, Apr. 2013, doi: 10.1103/physrevlett.110.145004.
    3. J. Adámek et al., “Application of the Ball-Pen Probe in Two Low-Temperature Mag-netised Plasma Devices and in Torsatron TJ-K,” Contributions to Plasma Physics, vol. 53, Art. no. 1, Jan. 2013, doi: 10.1002/ctpp.201310007.
    4. A. Köhn, E. Holzuhauer, M. O’Brien, M. Ramisch, R. Vann, and T. Williams, “Influence of density perturbations on the O--X mode conversion,” in Proc. of the 40th EPS Conference on Plasma Physics, Espoo, Finland, 2013.

  14. 2012

    1. G. Birkenmeier, M. Ramisch, G. Fuchert, A. Köhn, B. Nold, and U. Stroth, “Spatial structure of drift-wave turbulence and transport in a stellarator,” Plasma Physics and Controlled Fusion, vol. 55, Art. no. 1, Nov. 2012, doi: 10.1088/0741-3335/55/1/015003.
    2. P. Manz, G. Birkenmeier, M. Ramisch, and U. Stroth, “A link between nonlinear self-organization and dissipation in drift-wave turbulence,” Physics of Plasmas, vol. 19, Art. no. 8, Aug. 2012, doi: 10.1063/1.4748143.
    3. B. Nold et al., “Influence of temperature fluctuations on plasma turbulence investigations with Langmuir probes,” New Journal of Physics, vol. 14, Art. no. 6, Jun. 2012, doi: 10.1088/1367-2630/14/6/063022.
    4. G. Fuchert, B. Bätz, G. Birkenmeier, M. Ramisch, and U. Stroth, “Influence of plasma edge dynamics on blob properties,” 39th EPS Conference on Plasma Physics 2012, EPS 2012 and the 16th International Congress on Plasma Physics, vol. 3, pp. 1999–2002, 2012.

  15. 2008

    1. A. Kohn, H. Hohnle, E. Holzhauer, W. Kasparek, M. Ramisch, and U. Stroth, “ECRH of overdense plasmas in TJ-K,” AIP Conference Proceedings, vol. 993, Art. no. 1, 2008.

News

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Foto: Alf Köhn-Seemann

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Foto: Höfler et al., Nat. Commun. 16, 2558 (2025). CC BY 4.0

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DFG Projekt zur Wechselwirkung von turbulentem Teilchen- und Impulstransport bekommt Verstärkung

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Abschluss des FUSION-EP-Sommertreffens 2023 in Stuttgart

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Jährliches Sommer-Meeting von FUSION-EP (European Master in Nuclear Fusion Science and Engineering Physics)

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Fusionsforschung in die Schule bringen

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Dr. Köhn beim Workshop.

Dr. Köhn als Dozent beim Fusionsworkshop in Costa Rica

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IGVP-Doktorand erhält Itoh Project Prize 2019

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Foto: © IGVP, Universität Stuttgart

IGVP publication among the highlights of 2018 collection

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Inspiring Winter Meeting of the FUSION-EP Master programme at the ITER Site

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Mirko Ramisch

Dr.

Dozent, Leiter Plasmadynamik und -diagnostik, Bibliotheksbeauftragter

Dieses Bild zeigt Alf Köhn-Seemann

Alf Köhn-Seemann

Dr.

Dozent, Principal Investigator Plasmadynamik und -diagnostik

[Bild: Alf Köhn-Seemann]

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