Florian Effenberg, PhD
Princeton Plasma Physics Laboratory
Tokamak Experimental Science Department
on research assignment at:
General Atomics / DIII-D, San Diego, CA
Florian Effenberg, PhD
Florian Effenberg is a Staff Research Physicist at the Princeton Plasma Physics Laboratory (PPPL) and Principal Investigator (PI) of a multi-institutional project funded by the U.S. Department of Energy, Office of Fusion Energy Sciences (2025–2030), on plasma–material interactions and wall conditioning in tokamak fusion devices (DOE award DE-SCL0000109). He is based at the DIII-D National Fusion Facility in San Diego, California. He also serves as Deputy Research Coordinator for U.S. plasma–material interaction activities within the Tokamak Research portfolio, coordinating efforts across multiple tokamak facilities, including DIII-D and KSTAR.
Effenberg leads an International Tokamak Physics Activity (ITPA) Divertor and Scrape-Off Layer task on in-situ boron injection for impurity control in ITER-relevant scenarios and serves as Deputy Lead of the DIII-D Wall Change Preparation Task Force. He has also contributed to leadership efforts in the DIII-D Fusion Pilot Plant Wall Materials Thrust, including experimental campaigns on tungsten and alloy plasma-facing materials, as well as wall conditioning studies using real-time low-Z material injection. His research integrates experiments, modeling, and surface and boundary diagnostics to validate predictive models of impurity control and plasma-facing component performance, with emphasis on core–edge compatible power exhaust solutions in reactor-relevant environments. This work contributes to enabling predictive and actively controlled plasma-facing component solutions for ITER and future fusion pilot plants.
Effenberg received his Ph.D. in Nuclear Engineering and Engineering Physics from the University of Wisconsin–Madison, where he conducted research on three-dimensional plasma edge transport and radiative power exhaust in the Wendelstein 7-X stellarator. He led impurity seeding experiments and performed modeling using the EMC3-EIRENE edge transport code, for which he received the James D. Callen Fellowship for Excellence in Plasma Theory. Following his Ph.D., he continued research on plasma–material interactions and power exhaust in stellarator experiments before joining PPPL in 2019 as a Research Associate in the ITER & Tokamaks Department.
- PhD Nuclear Engineering & Engineering Physics
Selected papers
F. Effenberg et al, 'Integrated modeling of boron powder injection for real-time plasma-facing component conditioning', Nuclear Materials and Energy 42, 101832, 2025, https://doi.org/10.1016/j.nme.2024.101832; arXiv:2407.00821
F. Effenberg et al, In-situ coating of silicon-rich films on tokamak plasma-facing components with real-time Si material injection', Nuclear Fusion 63 106004, 2023, https://doi.org/10.1088/1741-4326/acee98; arXiv:2304.03923
F. Effenberg et al, 'Mitigation of plasma-wall interactions with low-Z powders in DIII-D high confinement plasmas', Nuclear Fusion 62 106015, 2022, https://doi.org/10.1088/1741-4326/ac899d; arXiv:2203.15204
F. Effenberg et al, '3D modeling of boron transport in DIII-D L-mode wall conditioning experiments', Nuclear Materials and Energy 26, 100900, 2021, https://doi.org/10.1016/j.nme.2021.100900 , Published manuscript
F. Effenberg et al, 'First demonstration of radiative power exhaust with impurity seeding in the island divertor at Wendelstein 7-X', Nuclear Fusion 59 (10), 106020, 2019, https://doi.org/10.1088/1741-4326/ab32c4 , Accepted manuscript
F. Effenberg et al 'Investigation of 3D effects on heat fluxes in performance-optimized island divertor configurations at Wendelstein 7-X', Nuclear Materials and Energy 18, 262-267, 2019, https://doi.org/10.1016/j.nme.2019.01.006, Published manuscript
F. Effenberg et al, 'Numerical investigation of plasma edge transport and limiter heat fluxes in Wendelstein 7-X startup plasmas with EMC3-EIRENE', Nucl. Fusion 57 036021, 2017, https://doi.org/10.1088/1741-4326/aa4f83, Accepted manuscript
J. Coburn, F. Effenberg et al, 'Overview of advanced plasma-facing materials testing for Fusion Pilot Plants at DIII-D', Nuclear Materials and Energy 46, 102064, 2026, https://doi.org/10.1016/j.nme.2026.102064
M. Morbey, F. Effenberg et al, 'Deuterium retention in pre-lithiated samples and Li–D co-deposits in the DIII-D tokamak', Nuclear Materials and Energy 43, 101915, 2025, https://doi.org/10.1016/j.nme.2025.101915
E.M. Hollmann, A. Bortolon, F. Effenberg et al, ' Dynamic measurement of impurity ion transport in runaway electron plateaus in DIII-D', Physics of Plasmas 29, 022503, 2022, https://doi.org/10.1063/5.0080385
K. Schmid, F. Effenberg et al, 'Integrated modeling: Coupling of surface evolution and plasma-impurity transport', Nuclear Materials and Energy, Volume 25, 100821, 2020, https://doi.org/10.1016/j.nme.2020.100821
H. Niemann, M.W. Jakubowski, F. Effenberg et al, 'Features of near and far scrape-off layer heat fluxes on the Wendelstein 7-X inboard limiters', Nucl. Fusion 60 016014, 2020, https://doi.org/10.1088/1741-4326/ab472c
V. Perseo, F. Effenberg et al, 'Direct measurements of counter-streaming flows in a low-shear stellarator magnetic island topology', Nucl. Fusion 59 124003, 2019, https://doi.org/10.1088/1741-4326/ab4320
T. Barbui, F. Effenberg et al, 'Radiative edge cooling experiments in Wendelstein 7-X start-up limiter campaign', Nucl. Fusion 59 076008, 2019, https://doi.org/10.1088/1741-4326/ab18c5, Accepted manuscript
L. Stephey, A. Bader, F. Effenberg et al, 'Impact of magnetic islands in the plasma edge on particle fueling and exhaust in the HSX and W7-X stellarators’, Physics of Plasmas 25, 062501 2018, https://doi.org/10.1063/1.5026324, Accepted manuscript
H. Frerichs, F. Effenberg et al, 'Reconstruction of recycling flux from synthetic camera images, evaluated for the Wendelstein 7-X startup limiter', Nucl. Fusion 57 126022, 2017, https://doi.org/10.1088/1741-4326/aa8515, Accepted manuscript
G.A. Wurden, C. Biedermann, F. Effenberg et al, 'Limiter observations during W7-X first plasmas', Nucl. Fusion 57 056036, 2017, https://doi.org/10.1088/1741-4326/aa6609
Selected conference contributions
F. Effenberg et al, 'In situ growth and replenishment of PFC coatings with real-time material injection for enhanced steady-state plasma operation', contributed talk, The IEEE Symposium on Fusion Engineering, (SOFE 2023), July 9–13, 2023; UK Atomic Energy Authority; Oxford, UK
F. Effenberg et al, 'EMC3-EIRENE modeling of toroidally-localized material injections and its effect on plasma-material interactions', contributed talk, 19th International Conference on Plasma-Facing Materials and Components for Fusion Applications, (PFMC-19), May 22–26, 2023; Bonn, Germany
F. Effenberg et al, 'In-situ growth of silicon-rich layers with Si granule injection in DIII-D H-mode plasmas', poster, 25nd International Conference on Plasma Surface Interactions 2022, (PSI-25), June 13–17, 2022; Jeju, Korea
F. Effenberg et al, 'Mitigation of plasma-material interactions with low-Z powders in DIII-D H-mode discharges', invited talk, video, 63rd Annual Meeting of the APS Division of Plasma Physics, November 8–12, 2021; Pittsburgh, PA, USA
F. Effenberg et al, '3D modeling of boron transport in DIII-D L-mode real-time wall conditioning experiments', poster, video, 24th International Conference on Plasma Surface Interaction in Fusion Devices (PSI-24), Jeju, Korea, May 31st - June 5, 2020
F. Effenberg et al, 'Development of impurity seeding for divertor power flux handling in Wendelstein 7-X long pulse scenarios', poster, The 19th International Conference on Fusion Reactor Materials (ICFRM-19), Oct 27 – Nov 1, 2019, La Jolla, California, USA
F. Effenberg et al, 'Radiative Power Exhaust in the Island Divertor and Access to Controlled Detachment with Impurity Seeding’, contributed talk, 22nd International Stellarator and Heliotron Workshop 2019 (ISHW 2019), Madison, WI, USA
F. Effenberg et al, ‘Power Exhaust Control by Impurity Seeding in the Island Divertor at Wendelstein 7-X', contributed talk, 27th IAEA Fusion Energy Conference (FEC 2018), 22-27 Oct 2018, Ahmedabad, India
F. Effenberg et al, 'Exploration of Radiative Edge Cooling in the Island Divertor at Wendelstein 7-X', contributed talk, 23rd International Conference on Plasma Surface Interactions in Controlled Fusion Devices (PSI 23), Princeton, NJ, 17-22 June 2018
F. Effenberg et al, 'Analysis of the heat flux characteristics in the helical scrape-off layer of Wendelstein 7-X start up scenarios by 3-D modeling', contributed talk, 58th Annual Meeting of the APS Division of Plasma Physics, Oct 31 - Nov 4, 2016, San Jose, CA, USA
Additional publications are available via Google Scholar or NCBI