WOONGHEE HAN

AI Scientist at Samsung Electronics

PhD in Physics / Interdisciplinary PhD in Physics and Statistics, MIT

GitHub

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harryhan@alum.mit.edu

RESEARCH HIGHLIGHTS

MIT News

Machine learning facilitates “turbulence tracking” in fusion reactorsResearchers demonstrated the use of computer-vision models to monitor turbulent structures that appear in plasma created in controlled-nuclear-fusion research. They created a synthetic dataset to train these models to identify and track the structures, which can affect the interactions between the plasma and the walls of the plasma vessel.

Articles: Machine learning facilitates “turbulence tracking” in fusion reactors | US Department of Energy, MIT News, Newsweek, EurekAlert!, Newswise

Podcast invited talk: Clubhouse "Quantum Photonics"

U.S. Department of Energy - Fusion Energy Sciences Highlights

To Track Turbulence in Tokamaks, Researchers Turn to Machine LearningMachine learning techniques track turbulent blobs in millions of frames of video from tokamak experiments.

37th of Top 100 Physics Nature Scientific Reports Papers 2022

Paper: Tracking Blobs in the Turbulent Edge Plasma of Tokamak Fusion Reactors | Nature Scientific Reports 12 (2022)

U.S. Department of Energy - Fusion Energy Sciences Highlights

Negative Triangularity—a Positive for Tokamak Fusion ReactorsNew research indicates reversing the conventional shape of plasmas could help with fusion reactor operation.

Paper: Suppression of first-wall interaction in negative triangularity plasmas on TCV | Nuclear Fusion 61 (2021)

Articles: Negative Triangularity—a Positive for Tokamak Fusion Reactors | US Department of Energy, Newswise, Phys.org, Scitech Daily

AREA OF RESEARCH

Plasma physics, experimental fusion research, edge turbulence in Tokamak

Computer vision, NLP

PUBLICATIONS

W. Han, N. Offeddu, T. Golfinopoulos, C. Theiler, J.L. Terry, C. Wüthrich, D. Galassi, C. Colandrea, E.S. Marmar, and the TCV team. Estimating SOL cross-field particle transport via blob-tracking with machine learning in positive and negative triangularity on TCV. 2023 Nucl. Fusion 63 076025.

N. Offeddu, C. Wüthrich, W. Han, C. Theiler, T. Golfinopoulos, J. L. Terry, E. Marmar, A. Ravetta, and G. Van Parys. Analysis techniques for blob properties from gas puff imaging data. Rev. Sci. Instrum. 94, 033512 (2023).

N. Offeddu, C. Wüthrich, W. Han, C. Theiler, T. Golfinopoulos, J.L. Terry, E. Marmar, C. Galperti, Y. Andrebe, R. Bertizzolo, A. Clement, B. Duval, O. Février, H. Elaian, D. Gonczy, J.D. Landis, and the TCV team. Gas Puff Imaging on the TCV Tokamak. Rev. Sci. Instrum. 93, 123504 (2022).

W. Han, R.A. Pietersen, R. Villamor-Lora, M. Beveridge, N. Offeddu, T. Golfinopoulos, C. Theiler, J.L. Terry, E.S. Marmar, I. Drori. Tracking Blobs in the Turbulent Edge Plasma of Tokamak Fusion Reactors. Nature Scientific Reports 12 18142 (2022).

C. Wüthrich, C. Theiler, N. Offeddu, D. Galassi, D.S. de Oliveira, B.P. Duval, O. Février, T. Golfinopoulos, W. Han, E.S. Marmar, J.L. Terry, C.K. Tsui, and the TCV team. X-point and divertor filament dynamics from Gas Puff Imaging on TCV. 2022 Nucl. Fusion 62 106022.

N. Offeddu, W. Han, C. Theiler, T. Golfinopoulos, J.L. Terry, E.S. Marmar, C. Wüthrich, C.K. Tsui, H. de Oliveira, B.P. Duval, D. Galassi, D.S. de Oliveira, D. Mancini, and the TCV team. Cross-field and parallel dynamics of SOL filaments in TCV. 2022 Nucl. Fusion 62 096014.

H. Reimerdes et al. Overview of the TCV tokamak experimental programme. 2022 Nucl. Fusion 62 (4) 042018.

W. Han, N. Offeddu, T. Golfinopoulos, C. Theiler, C.K. Tsui, J.A. Boedo, E.S. Marmar, and the TCV team. Suppression of first-wall interaction in negative triangularity plasmas on TCV. 2021 Nucl. Fusion 61 034003.

T. Golfinopoulos , B. LaBombard , D. Brunner , J.L. Terry , S.G. Baek, P. Ennever, E. Edlund, W. Han, W.M. Burke, S.M. Wolfe, J.H. Irby, J.W. Hughes , E.W. Fitzgerald, R.S. Granetz, M.J. Greenwald, R. Leccacorvi, E.S. Marmar, S.Z. Pierson, M. Porkolab, R.F. Vieira, S.J. Wukitch and The Alcator C-Mod Team. Edge transport and mode structure of a QCM-like fluctuation driven by the Shoelace antenna. 2018 Nucl. Fusion 58 056018.

B. Lahmann, L. M. Milanese, W. Han, M. Gatu Johnson, F. H. Séguin, J. A. Frenje, R. D. Petrasso, K. D. Hahn, and B. Jones. Application of the coincidence counting technique to DD neutron spectrometry data at the NIF, OMEGA, and Z. Rev. Sci. Instrum. 87, 11D801 (2016).

PRESENTATIONS

W. Han, R.A. Pietersen, R. Villamor-Lora, M. Beveridge, N. Offeddu, S. Ahmed, G. Decristoforo, T. Golfinopoulos, C. Theiler, J.L. Terry, E.S. Marmar, I. Drori, and the TCV team “Tracking Blobs with Machine Learning in the Turbulent Edge Plasma of a Tokamak.” Oral presentation at the 64th annual meeting of the American Physical Society Division of Plasma Physics, Oct. 2022.

W. Han, N. Offeddu, T. Golfinopoulos, C. Theiler, C.K. Tsui, J.A. Boedo, J.L. Terry, R.A. Pietersen, R. Villamor-Lora, M. Beveridge, I. Drori, E.S. Marmar, and TCV team “Exploring the Edge/SOL Fluctuations in Negative Triangularity Plasmas on TCV.” Oral presentation at the 63rd annual meeting of the American Physical Society Division of Plasma Physics, Nov. 2021.

W. Han, N. Offeddu, T. Golfinopoulos, C. Theiler, C.K. Tsui, J.A. Boedo, J.L. Terry, E.S. Marmar, and the TCV team "Suppression of First-wall Interaction in Negative Triangularity Plasmas on TCV." Poster presented at the 24th annual meeting of the International Conference on Plasma Surface Interactions in Controlled Fusion Devices, Jan. 2021.

W. Han, N. Offeddu, T. Golfinopoulos, C. Theiler, C.K. Tsui, J.A. Boedo, J.L. Terry, E.S. Marmar, and the TCV team "Suppression of First-wall Interaction in Negative Triangularity Plasmas on TCV." Oral presentation at the 62nd annual meeting of the American Physical Society Division of Plasma Physics, Nov. 2020.

W. Han, N. Offeddu, T. Golfinopoulos, C. Theiler, C.K. Tsui, J.A. Boedo, J.L. Terry, E.S. Marmar, and the TCV team "Exploring the Dependence of Edge/SOL Turbulence Characteristics on Triangularity Using Gas Puff Imaging on TCV." Poster presented at the 61st annual meeting of the American Physical Society Division of Plasma Physics, Fort Lauderdale, Florida, Oct. 2019.

W. Han, N. Offeddu, T. Golfinopoulos, C. Theiler, J.L. Terry, S.G. Baek, Y. Andrebe, B.P. Duval, B. LaBombard, E.S. Marmar, and the TCV team "Design and Implementation of a Gas Puff Imaging System on TCV." Poster presented at the 60th annual meeting of the American Physical Society Division of Plasma Physics, Portland, Oregon, Nov. 2018.

W. Han, J.L. Terry, T. Golfinopoulos, S.G. Baek, D. Brunner, P. Ennever, B. LaBombard, E. Marmar "Gas-Puff Imaging Observations of the Edge Mode Driven by the Shoelace Antenna." Poster presented at the 58th annual meeting of the American Physical Society Division of Plasma Physics, San Jose, California, Oct. 2016.

W. Han, H. Kim, Y. Lim, J. Seon, W. Choe "Cold cathode optimization through Object-Oriented Particle-in-Cell plasma simulation." Poster presented at the meeting of the Korean Physical Society, Gwangju, Republic of Korea, Oct. 2014.