Udo von Toussaint


Numerical Methods of Plasma Physics

Plasma-Material Interaction/ Reactive Plasma Processes

Surface Physics/ Material Research Division /E2M (Max-Planck-Institute for Plasmaphysics)


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Publications of the Bayes Group at IPP (up to 2010)

PD Udo von Toussaint

Group Leader of the Data Analysis and Active Learning/AI group (DAAL) (formerly Plasma-Material Modeling and Foundations (PMMF) group) at IPP

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 Contact:

Udo von Toussaint
Max-Planck-Institut fuer Plasmaphysik
Boltzmannstrasse 2
85748 Garching, Germany
udo.v.toussaint@ipp.mpg.de
tel: +49 89 3299 1817
room: L3, 336 2nd floor

 Secretary:

Laura Fahrner (NMPP)
laura.fahrner@ipp.mpg.de
tel: +49 89 3299 2421
fax: +49 89 3299 1011


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News

Editor's pick of manuscript

The article Plasma parameter profile inference from limited data utilizing second-order derivative priors and physics-based constraints, in Physics of Plasmas 28(3), DOI: 10.1063/5.0039011 (2021) has been selected as Editor's pick.

Lectures in 2021/2022

Due to the Corona situation no face-to-face lectures are presently possible. Hopefully the situation will improve in or after WS 2021/2022.

MaxEnt 2019

PMMF/IPP hosted in July 2019 the Workshop on Bayesian Inference and Maximum Entropy Methods in Science and Engineering (MaxEnt 2019) in Garching, Germany. The previous MaxEnt 2018 was hosted by the Alan Turing Institute, London.

Uncertainty Quantification of plasma transport models using Polynomial Chaos Expansion

Seminar on Castle Ringberg
Lecturer: Dr. Udo v. Toussaint
Nov 2018

Lectures on Bayesian Experimental Design in Science and Engineering (2019)

Lecturer: Dr. Udo v. Toussaint
Location: TU Graz (Austria)
03 Feb 2019 - 08 Feb 2019

Reduced Complexity Models

Within the central research initiative of the Helmholtz society on Information and Data Science our proposal on new approaches for the development of Reduced Complexity Models was one of only 5 proposals to be selected and fully funded. For details please see the press release.

Research interests
The PMMF group pursues two main lines of research, the interaction of energetic and/or reactive species with surfaces and modern simulation techniques, data analysis methods and optimal experimental design. Machine learning approaches (i.e. Gaussian processes), Artificial Intelligence techniques (ANNs) and multiscale modelling are an integral part of the activities. Recent activities include
  • Model complexity reduction approaches
  • Polynomial Chaos Expansion methods for Uncertainty Quantification
  • ill-posed inverse problems (e.g. time resolved power density estimation in ASDEX Upgrade, deconvolutions)
  • Molecular Dynamics Simulations:
  • Bayesian Inference: Bayesian Experimental Design, Integrated Data Analysis, Probabilistic Prediction, Intelligent instruments
  • High-dimensional integration: Markov Chain Monte Carlo methods (eg thermodynamic integration, slice sampling, nested sampling,...)
  • Real-time data analysis (e.g. using Bayesian Neural Networks (BNN)) e.g. for Mass spectrometer analysis or Ellipsometry

Publications

For Publications after 2011: Please use the search engines of the Max-Planck Digital Library (MPDL), Google Scholar or Web of Science.

Publications (2011)
  • U. von Toussaint: Bayesian Inference in Physics, Review of Modern Physics 83 p. 943-999, (2011), DOI:http://dx.doi.org/10.1103/RevModPhys.83.943
  • Accepted: U. von Toussaint, S. Gori, A. Manhardt, T. Höschen and C. Höschen: Hydrogen transport in tungsten grain boundaries, In: Physica Scripta
  • Accepted: K. Tichmann, U. von Toussaint, W. Jacob: Determination of the sticking coefficient of energetic hydrocarbon molecules by molecular dynamics, In: Journal of Nuclear Materials
  • Accepted: M. Mayer, U. von Toussaint, J. Dewalque, O. Dubreuil, C. Henrist, R. Cloots, F. Mathis: RBS analysis of porous thin TiO2 films, In: Nuclear Instruments and Methods in Physics ResearchB: Beam Interactions with Materials and Atoms
  • H. Greuner, U. von Toussaint, B. Böswirth, J. Boscary, H. Maier, A. Peacock and H. Traxler: Performance and statistical quality assessment of CFC tile bonding on the pre-series elements of the Wendelstein 7-X divertor, In: Fusion Engineering and Design 86, p. 1685-1688 (2011), DOI:http://dx.doi.org/10.1016/j.fusengdes.2010.12.025
  • Accepted: A. Manhardt, K. Schmid, U. von Toussaint, W. Jacob: Analysis of Blisters using TDS and SEM, In: Physica Scripta
  • U. von Toussaint and S. Gori: Digital Particle Image Velocimetry using Splines in tension, In: Bayesian inference and Maximum Entropy methods in Science and Engineering, AIP 1305, p. 337-345 (2011)
  • M. Mayer and W. Eckstein and H. Langhuth and F. Schiettekatte and U. von Toussaint: Computer simulation of ion beam analysis: Possibilities and limitations, In: Nuclear Instruments and Methods in Physics ResearchB: Beam Interactions with Materials and Atoms, DOI: http://dx.doi.org/10.1016/j.nimb.2011.04.066 (2011)
  • P.R. Harris and F.W. Meyer and W. Jacob and T. Schwarz-Selinger and U. von Toussaint: Molecular size effect in the chemical sputtering of a-C:H thin films by low energy H+,H2+ and H3+ ions, In: Nuclear Instruments and Methods in Physics ResearchB: Beam Interactions with Materials and Atoms 269, 11, 1276-1279 (2011)
  • Rohde, V. and Endstrasser, N. and von Toussaint, U. and Balden, M. and Hakola, T.L.R.N.A. and Bucalossi, J. and ASDEX Upgrade Team: Tungsten Erosion by Arcs in ASDEX Upgrade, In: Journal of Nuclear Materials, DOI: http://dx.doi.org/10.1016/j.jnucmat.2010.11.045 (2011)

Publications (2010)
  • Mayer, M., K. Arstila and U. von Toussaint: Skewness of energy straggling distributions. In: Nuclear Instruments and Methods in Physics ResearchB: Beam Interactions with Materials and Atoms 268, 11-12, 1744-1748 (2010).
  • von Toussaint, U., M. Frey and S. Gori: Bayesian Fitting of Functions with Uncertainities in Dependent and Independent Variables, In: Maximum Entropy and Bayesian Methods, AIP 1193, p. 302-310 (2010)
  • von Toussaint, U., T. Schwarz-Selinger, M. Mayer and S. Gori: Optimizing NRA Depth profiling using Bayesian Experimental Design, In: Nuclear Instruments and Methods in Physics ResearchB: Beam Interactions with Materials and Atoms 268, 11-12, 2115-2118 (2010).
  • F.W. Meyer and P.R. Harris and H. Zhang and W. Jacob and T. Schwarz-Selinger and U. von Toussaint: Erosion of a-C:D thin films by low energy D+,D2+ and D3+ ions, In: Journal of Nuclear Materials, DOI: http://dx.doi.org/10.1016/j.jnucmat.2010.08.037

Publications (2009)
  • Tichmann, K., U. von Toussaint, T. Schwarz-Selinger and W. Jacob: Determination of the sticking probability of hydrocarbons on an amorphous hydrocarbons surface, In: Physica Scripta T138, 014015
  • von Toussaint, U., P. N. Maya and C. Hopf: Molecular dynamics modeling of chemical erosion of hydrocarbon films. In: Journal of Nuclear Materials 386-388, 353-355 (2009).
    doi: 10.1016/j.jnucmat.2008.12.130 url: http://dx.doi.org/10.1016/j.jnucmat.2008.12.130
  • Mayer, M., E. Gauthier, K. Sugiyama and U. von Toussaint: Quantitative depth profiling of deuterium up to very large depths. In: Nuclear Instruments and Methods in Physics ResearchB: Beam Interactions with Materials and Atoms 267, 3, 506-512 (2009).
    doi: 10.1016/j.nimb.2008.11.033 url: http://dx.doi.org/10.1016/j.nimb.2008.11.033
  • de Rooij, E. D., U. von Toussaint, A. W. Kleyn and W. J. Goedheer: Molecular dynamics simulations of amorphous carbon surfaces under extremely high hydrogen fluxes. In: Physical Chemistry and Chemical Physics 11, 42, 9823-9830 (2009).
    doi: 10.1039/b908389h url: http://dx.doi.org/10.1039/b908389h
  • von Toussaint, U., P. N. Maya, C. Hopf and M. Schlüter: Molecular Dynamics simulations of synergistic erosion of amorphous hydrocarbon films. In: Physica Scripta, T138, 014018.
    url: http://dx.doi.org/doi:10.1088/0031-8949/T135/4/000000
  • Schwarz-Selinger, T., von Toussaint, U., Hopf, C. and Jacob W., Fuel removal from tile gaps with oxygen discharges: reactivity of neutrals. In: Physica Scripta, T138, 014009.
  • Andreeva, T., T. Bräuer, M. Endler, J. Kißlinger and U. von Toussaint: Influence of construction errors on Wendelstein 7-X magnetic configurations. In: Fusion Engineering and Design 84, 2-6, 408-412 (2009).
    doi: 10.1016/j.fusengdes.2008.12.073 url: http://dx.doi.org/10.1016/j.fusengdes.2008.12.073
  • Optimizing NRA measurements using Bayesian Experimental Design Udo von Toussaint, Thomas Schwarz-Selinger, Silvio Gori. In Maximum Entropy and Bayesian Methods, AIP 1073, p. 348-358 (2009). (See the MaxEnt-Conference 2008.)
See also ...
Open positions at the PMMF-group
  • Sorry - at present all available positions are filled.
  • Please contact udo.v.toussaint@ipp.mpg.de for further informations.
Presently occupied positions at the PMMF group
  • Degree theses: (2+1)dim-deconvolution of thermography measurements
  • Humboldt-Fellowship: Machine learning approaches for automated MD-potential design
Finished projects at the PMMF and the Reactive Plasma Processes group
  • Degree theses: Design, Implementation and statistical analysis of a world-wide data base of dust particles in fusion devices (in collaboration with IAEA (Vienna))
  • Degree theses: Design, implementation and evaluation of GPU(OpenCL)-based algorithms (Hardware: NVIDIA Tesla system with 4 FX5800 GPUs) for Markov chain Monte Carlo (MCMC) algorithms for stochastic integration
  • Degree theses: Design, implementation and evaluation of GPU(OpenCL)-based algorithms (Hardware: NVIDIA Tesla system with 4 FX5800 GPUs) for Adaption of a fast Grad-Shafranov-equation solver.

    in collaboration with the Technical University of Munic, Faculty of Informatics, Prof. A. Bode
  • degree theses: design and characterization of a quartz-microbalance suited for UHV-environments (in collaboration with the Universität der Bundeswehr)
  • PhD theses: Detection and modeling of the most important chemical interactions in a low-temperature hydrocarbon plasma and comparison with absolutely quantified results from molecular beam mass spectroscopy.



Positions
2008-current Head of the Scientist Council of the Max-Planck-Institute for Plasmaphysics.
2007-current Member of the Special Experts Working Group on Plasma-Wall-Interactions of EFDA (European Fusion Programme)
2006-current Member of the scientific-technical council of the Helmholtz Society
2010-current Senior scientist in the Plasma-Material-Interaction Group at the E2M Division (Prof. U. Stroth/Dr. W. Jacob), Max-Planck-Institute for Plasmaphysics.
2002-2010 Senior scientist in the Reactive Plasma Processes Group at the Material Research Division (Prof. Bolt/Dr. Joachim Roth), Max-Planck-Institute for Plasmaphysics.
2000-2001 guest scientist at the NASA Ames Research Center, at the Research Institute for Advanced Computer Science (RIACS)(Peter Cheeseman) in Mountain View, CA, USA.
1997-2000 PhD student at the Max-Planck-Institute for Plasmaphysics, Surface Physics Division (Prof. Volker Dose), Garching.
1991-1996 student at the University of Bayreuth (Prof. Friedrich Küppers), Institute for Experimental Physics III, U Bayreuth.
Current research interests
  • Bayesian Inference: Bayesian Experimental Design, Integrated Data Analysis, Probabilistic Prediction, Intelligent instruments, Active Learning approaches
  • Molecular Dynamics Simulations: Chemical erosion of amorphous hydrocarbon films (a-CH-films), plasma-wall interaction. See this example: Snapshot of an a-CH-sample under Argon bombardment
  • Ion Beam Methods: Nuclear Reaction Analysis (NRA), RBS, ERDA, PIXE
  • High-dimensional integration: Markov Chain Monte Carlo methods (eg thermodynamic integration, slice sampling, nested sampling,...)
  • Real-time data analysis (e.g. using Bayesian Neural Networks (BNN))
Impressum