Publications

Featured Articles

Azarakhsh Jalalvand, Max Curie, SangKyeun Kim, Jaemin Seo, Peter Steiner, Qiming Hu, Andrew Oakleigh Nelson, Egemen Kolemen, M. Curie, Y.-S Na (2025). Multimodal Super-Resolution: Discovering hidden physics and its application to fusion plasmas. Nature Communications, 16, 8506. Link
T. Bechtel Amara, S. P. Smith, Z. A. Xing, T. F. Neiser, C. Simpson, A. O. Nelson, et al. (2025). Accelerating Discoveries at DIII-D With the Integrated Research Infrastructure. Frontiers of Physics, 12, 1524041. DOI
S. K. Kim, R. Shousha, S. M. Yang, Q. Hu, S. H. Hahn, A. Jalalvand, J.-K. Park, N. C. Logan, A. O. Nelson, et al. (2024). Highest fusion performance without harmful edge energy bursts in tokamak. Nature Communications, 15(1), 3990. DOI
Craig Michoski, Todd A Oliver, David R Hatch, Ahmed Diallo, Mike Kotschenreuther, David Eldona, Matthew Wallerb, Richard Groebnera, A. O. Nelson (2024). A Gaussian Process Guide for Signal Regression in Magnetic Fusion. Nuclear Fusion, 64, 035001. Link
A O Nelson, L Schmitz, C Paz-Soldan, K E Thome, T B Cote, N Leuthold, F Scotti, M E Austin, A Hyatt, T Osborne (2023). Robust Avoidance of Edge-Localized Modes alongside Gradient Formation in the Negative Triangularity Tokamak Edge. Physical Review Letters, 131, 195101. Link
A. Jalalvand, A. A. Kappatou, A. V. Garcia, A. O. Nelson, J. Abbate, M. Austin, G. Verdoolaege, S. L. Brunton, W. W. Heidbrink, E. Kolemen (2022). Alfvén eigenmode classification based on ECE diagnostics at DIII-D using deep recurrent neural networks. Nuclear Fusion, 62, 026007. Link
T. A. Bechtel, A. O. Nelson, L. L. Lao, Z. A. Xing, S. P. Smith, R. Nazikian, S. Flanagan, D. Schissel, L. Stephey, R. Thomas, S. Williams, O. Antepara, E. Dart, E. Koleman, W. Tang (2022). Accelerated Workflow for Advanced Kinetic Equilibria. 2022 First Combined International Workshop on Interactive Urgent Supercomputing (CIW-IUS), 1–5. DOI
Viraj Mehta, Ian Char, Willie Neiswanger, Youngseog Chung, A. O. Nelson, Mark D Boyer, Egemen Kolemen, Jeff Schneider (2021). Neural Dynamical Systems: Balancing Structure and Flexibility in Physical Prediction. 2021 60th IEEE Conference on Decision and Control (CDC), 3735–3742. Link
Youngseog Chung, Ian Char, Willie Neiswanger, Kirthevasan Kandasamy, A. O. Nelson, Mark D Boyer, Egemen Kolemen, Jeff Schneider (2020). Offline Contextual Bayesian Optimization for Nuclear Fusion. Machine Learning and the Physical Sciences Workshop at the 33rd Conference on Neural Information Processing Systems (NeurIPS), 1–12. Link

First Author Publications

[116] A. O. Nelson, C. Vincent, H. Anand, J. Lovell, J. F. Parisi, H. S. Wilson, K. Imada, W. P. Wehner, M. Kochan, S. Blackmore, G. McArdle, S. Guizzo, L. Rondini, S. Freiberger, Carlos Paz-Soldan (2024). First Access to ELM-free Negative Triangularity at Low Aspect Ratio. Nuclear Fusion, 64, 124004. DOI
[115] A. O. Nelson, et al. (2024). Characterization of the ELM-free Negative Triangularity Edge on DIII-D. Plasma Physics and Controlled Fusion, 66, 105014. Link
[114] A. O. Nelson, D. T. Garnier, D.J. Battaglia, C. Paz-Soldan, I. Stewart, M. Reinke, A.J. Creely, J. Wai (2024). Implications of vertical stability control on the SPARC tokamak. Nuclear Fusion, 64(8), 086040. DOI
[113] A. O. Nelson, A. W. Hyatt, W. P. Wehner, A. S. Welander, C. Paz-Soldan, T. H. Osborne, H. Anand, K. E. Thome (2023). Vertical Control of DIII-D Discharges with Strong Negative Triangularity. Plasma Physics and Controlled Fusion, 65, 044002. DOI
[112] A O Nelson, L Schmitz, C Paz-Soldan, K E Thome, T B Cote, N Leuthold, F Scotti, M E Austin, A Hyatt, T Osborne (2023). Robust Avoidance of Edge-Localized Modes alongside Gradient Formation in the Negative Triangularity Tokamak Edge. Physical Review Letters, 131, 195101. Link
[111] A. O. Nelson, Carlos Paz-Soldan, Samuli Saarelma (2022). Prospects for H-mode inhibition in negative triangularity tokamak reactor plasmas. Nuclear Fusion, 62, 096020. DOI
[110] A. O. Nelson, Z. A. Xing, O. Izacard, F. M. Laggner, E. Kolemen (2021). Interpretative SOL modeling throughout multiple ELM cycles in DIII-D. Nuclear Materials and Energy, 26, 100883. Link
[109] A. O. Nelson, F. M. Laggner, A. Diallo, D. R. Smith, Z. A. Xing, R. Shousha, E. Kolemen (2021). Time-dependent experimental identification of inter-ELM microtearing modes in the tokamak edge on DIII-D. Nuclear Fusion, 61, 116083. Link
[108] A. O. Nelson, N. Logan, E. Choi, E. J. Strait, E. Kolemen (2020). Experimental evidence of ECCD-based NTM suppression threshold reduction during mode locking on DIII-D. Plasma Physics and Controlled Fusion, 62, 094002. DOI
[107] A. O. Nelson, F. M. Laggner, R. J. Groebner, B. A. Grierson, O. Izacard, D. Eldon, M. Shafer, A. W. Leonard, D. Shiraki, A. C. Sontag, E. Kolemen (2020). Setting the H-mode pedestal structure: variations of particle source location using gas puff and pellet fueling. Nuclear Fusion, 60, 046003. DOI
[106] A. O. Nelson, R. J. La Haye, M. E. Austin, A. S. Welander, E. Kolemen (2019). Simultaneous detection of neoclassical tearing mode and electron cyclotron current drive locations using electron cyclotron emission in DIII-D. Fusion Engineering and Design, 141, 25–29. DOI
[105] A. O. Nelson, M. E. Austin, E. Kolemen (2019). Electron cyclotron emission based q-profile measurement and concept for equilibrium reconstruction. Plasma Physics and Controlled Fusion, 61, 085013. DOI
[104] A. O. Nelson, R. Dee, M. S. Gudipati, M. Horányi, D. James, S. Kempf, T. Munsat, Z. Sternovsky, Z. Ulibarri (2016). New experimental capability to investigate the hypervelocity micrometeoroid bombardment of cryogenic surfaces. Review of Scientific Instruments, 871(87), 24502–24502. Link
[103] A. O. Nelson, E. N. Grossman (2014). Advanced designs for non-imaging submillimeter-wave Winston cone concentrators. Proceedings of SPIE, 9102, 91020U. DOI

Invited Talks and Seminars

A. O. Nelson (2026). Separatrix Shape Dependence of the H-mode Power Threshold, Confinement Quality, and ELM Type. 20th International Workshop on H-mode Physics and Transport Barriers.
A. O. Nelson (2026). Flipping the Shape of Plasmas to Solve the Tokamak Heat-Flux Problem. CIPS Seminar at CU Boulder.
A. O. Nelson (2026). Applied plasma physics: the magnetic pursuit of fusion energy. CIPS Seminar at CU Boulder.
A. O. Nelson (2026). Design and Optimization of Tokamaks for Fusion Energy. Energy Frontier Seminars at the Institute of Renewable Energies in Mexico.
A. O. Nelson (2025). Using Magnets to Build a Star on Earth. Caltech Astronomy on Tap.
A. O. Nelson (2024). The Negative Triangularity Tokamak: Power Handling in a Fusion Power Plant. CU Boulder Saturday Physics Series.
A. O. Nelson (2024). The Negative Triangularity Edge. Physics World Webinar: Negative triangularity tokamaks: a power plant plasma solution from the core to the edge?.
A. O. Nelson (2024). The Negative Triangularity Tokmak: Ensuring Robust Access to a High-Performance, ELM-Free Fusion Power Plant. Symposium on Plasma And Nuclear Systems (SPANS-2024).
A. O. Nelson (2024). The Negative Triangularity Tokmak: Ensuring Robust Access to a High-Performance, ELM-Free Fusion Power Plant. UCI Physics Seminar Series.
A. O. Nelson (2023). Negative Triangularity: The Holy Grail for Tokamak Core-Edge Integration?. UCLA Plasma Science and Technology Institute Seminar Series.
A. O. Nelson (2023). Plasma Waves. Introduction to Fusion Energy and Plasma Physics Course. Link
A. O. Nelson (2023). Robust avoidance of edge localized modes alongside pedestal formation in negative triangularity plasmas. 65th Annual Meeting of the APS Division of Plasma Physics.
A. O. Nelson, et al. (2023). Initial Experimental Results from the DIII-D Negative Triangularity Campaign. 2nd International Fusion and Plasma Conference.
A. O. Nelson, L. Schmitz, T.B. Cote, C. Paz-Soldan, N. Leuthold, K. E. Thome, M. E. Austin, G. Yu, G. Kramer, S. Stewart (2023). Robust avoidance of peeling-ballooning instabilities through gradient reduction in the negative triangularity edge. 2023 US Transport Task Force Workshop.
A. O. Nelson (2022). H-mode Inhibition in Negative Triangularity Tokamak Reactors (Topical Plenary). 6th Asia-Pacific Conference on Plasma Physics.
A. O. Nelson (2021). Experimental identification of inter-ELM pedestal MTMs through edge current perturbations. 2021 US Transport Task Force Workshop.
A. O. Nelson (2020). Introduction to Outstanding Problems in Magnetic Confinement Fusion. APS-DPP Student Day.
A. O. Nelson (2020). A practical introduction to the H-mode pedestal: ELMs and ELM-free regimes. Fusion-EP Seminar Series.
A. O. Nelson, R J La Haye, M E Austin, A S Welander, E Kolemen (2019). ECE-based Tearing Mode Suppression and Equilibrium Reconstruction. 24th Workshop on MHD Stability Control.

Co-Author Publications

2027

[102] P Quinn, S. Haskey, L. Horvath, A.O. Nelson, J. Dunsmore, G. Wilkie, R. Gerru (2027). Experimental inference of 2D ionization sources and limitations on inward particle fluxes in DIII-D H-mode pedestals. 53rd European Conference on Plasma Physics.

2026

[101] Justin Cohen, Jason Kaufmann, Maxim Umansky, Adriana Ghiozzi, David Smith, Oak Nelson, Benedikt Zimmermann (2026). Yinsen: A low power density HTS tokamak fusion reactor for marine and off-grid applications. DOI
[100] R Perillo, A Redl, T Eich, C J Lasnier, A Nelson, D Silvagni, R J A Boedo, A McLean, P Traverso, N Vianello (2026). Multi machine small-ELM energy scaling. Plasma Phys. Control. Fusion, in review.
[99] S Benjamin, D. Burgess, A.O. Nelson, Z Keith, C. Hansen, C. Rea, T. Odstrcil (2026). An uncertainty-aware, general m,n tearing analysis workflow for large-scale tearing database generation. 30th Workshop on MHD Stability Control.
[98] A O Nelson, T Odstrčil, T Slendebroek, C F B Zimmermann, Z Li, N Leuthold (2026). Statistical EPED Predictions form ELM-Free Scenarios in DIII-D and Implications for Fusion Pilot Plant Design. 30th Workshop on MHD Stability Control.
[97] C F B Zimmermann, E Bursch, C Paz-Soldan, J Hanson, N Leuthold, N Logan, A O Nelson (2026). Assessing the effect of error field penetration during plasma current ramp-up in the DIII-D tokamak. 30th Workshop on MHD Stability Control.
[96] Alexandra Dudkovskaia, J. Candy, E. Belli, Michail Anastopoulos Tzanis, S McNamara, A. O. Nelson, R. Yang, TIm Stoltzfus-Dueck, C.F.B. Zimmerman (2026). Electromagnetic gyrokinetic analysis in Tokamak Energy’s pre-concept design of the ST-E1 fusion power plant. Nuclear Fusion, in review.
[95] A Lvovskiy, C Vincent, H Anand, A S Welander, S Blackmore, M Kochan, G McArdle, S Silburn, A O Nelson (2026). First Experimental Realization of Robust Negative Triangularity Plasma Control in a Spherical Tokamak. Plasma Phys. Control. Fusion, 68, 085016.
[94] K E Thome, M E Austin, S Coda, A Marinoni, A Hyatt, A. O. Nelson, T Odstrčil, C A Paz-Soldan, O Sauter, F Scotti, B Vanovac (2026). The Negative Triangularity Tokamak Path for Fusion Pilot Plants: Experimental Progress and Future Prospects. Physics of Plasmas, in review.
[93] K Yasoda, D Panici, A. O. Nelson, F M Laggner, S K Kim, E Kolemen (2026). Characterization of ELM Pacing via Vertical Jogs on DIII-D. Nuclear Fusion, in review.
[92] J Willis, S A M McNamara, E N J Maartensson, J Astbury, E Yildirim, N Hinton, C L Wilson, X Zhang, J W Berkery, L Baylor, M Shimada, H Flynn, A O Nelson, et al. (2026). Tokamak Energy’s Pre-Concept Design for a Fusion Power Plant: An Overview of ST-E. Nuclear Fusion, in press.
[91] S Ku, C.S. Chang, R. Hager, L. Schmitz, A.O. Nelson (2026). Difference in Neoclasscial Edge Flows Between Strongly Negative and Positive Triangularities in the XGC Gyrokinetic Simulation. Physics of Plasmas, 33, 032501. Link
[90] B. Vanovac, J. Hobirk, A.O. Nelson, O. Sauter, M. Faitsch, T. Puetterich, X. Liu, A. E. White (2026). Pedestal and core database of NT discharges in ASDEX Upgrade. 2026 Joint US-EU Transport Task Force Workshop.
[89] P Mantica, L Aucone, A Balestri, A Mariani, R Ambrosino, J Ball, A Castaldo, S Coda, T Happel, J Hobirk, B Labit, P Lang, G Merlo, A. O. Nelson, O Sauter, T Puetterich, G Tardini, B Vanovac, B Zimmerman (2026). Negative triangularity studies in view of DTT operations. Plasma Phys. Control. Fusion, in review.
[88] T. Slendebroek, A.O. Nelson, O. M. Meneghini, G. Dose, A. G. Ghiozzi, J. Harvey, B. C. Lyons, J. McClenaghan, T. F. Neiser, D. B. Weisberg, M. G. Yoo, E. Bursch, C. Holland (2026). Exploring the fusion power plant design space: comparative analysis of positive and negative triangularity tokamaks through optimization. Nuclear Fusion, 66, 026032. DOI
[87] A. Marinoni, C. Chrystal, S. Coda, R. Coosemans, C. Marini, M. Podesta, O. Sauter, M. Agostini, M. E. Austin, J. Barr, E. Belli, J. Candy, M. Gorelenkova, D. Hamm, A. W. Hyatt, M. Knolker, M. La Matina, P. Lunia, S. Mordijck, A. O. Nelson, et al. (2026). Non-dimensional confinement scaling in similar negative triangularity plasmas on the DIII-D and TCV tokamaks. Nuclear Fusion, in press.
[86] A. M. Wang, Z. Keith, M. D. Boyer, A. O. Nelson, A. Saperstein, A. Pau, C. Rea (2026). Technical Aspects of Plasma Operational Simulation (POPSIM): A Framework for Data-Driven Simulation and Control. IEEE Transactions on Plasma Science, in review.
[85] N. Leuthold, N.C. Logan, D.A. Burgess, A.O. Nelson, S.R. Benjamin, C. Hansen, A. Kumar, C. F. B. Zimmermann, F. Carpanese, A. J. Creely, J. C. Hillesheim, M. Muraca, C Paz-Soldan (2026). ARC Physics Basis - MHD. Journal of Plasma Physics, in review.
[84] N. Cao, D. R. Hatch, C. Michoski, T.A. Oliver, D. Eldon, A. O. Nelson, M. Waller (2026). Quantifying Resolution Limits in Pedestal Profile Measurements with Gaussian Process Regression. Nuclear Fusion, 66, 026016.
[83] J. C. Hillesheim, A. J. Creely, T. Eich, N. T. Howard, N. Leuthold, R. Sweeny, A. LeViness, A. O. Nelson, L. Nichols, R. A. Tinguely, M. Usoltseva, D.J. Battaglia, T.A.J. Body, C. Hansen, N. C. Logan, R.T. Mumgaard, P. Rodriguez Fernandez, P.B. Snyder, B.N. Sorbom, J.C. Wright (2026). Overview of the physics basis for the ARC fusion power plant. Journal of Plasma Physics, 92(3), E69.
[82] J. Li, F. Ebrahimi, R. Hager, A. O. Nelson (2026). Core turbulence during nonlinear total-f simulations of DIII-D negative triangularity regime. Physics of Plasmas, in review.
[81] R. Sweeney et al. (2026). ARC Disruption Physics and Strategy. Journal of Plasma Physics, in review.
[80] X. Zhang, N. A. Lopez, A. O. Nelson, L. Rondini, F. M. Poli (2026). Application of the Scrape-Off-Layer Fast Ion (SOLFI) code to assess particle motion in mirrors and tokamaks. Fusion Engineering and Design, in review.
[79] A. Kumar, C. Clauser, F. Carpanese, T. Golfinopoulos, A.O. Nelson, J. Wai, D. Battaglia, D. Boyer, D.T. Garnier, R. Granetz (2026). Axisymmetric n = 0 Growth Rate Modeling in Alcator C-Mod and SPARC: Rigid vs. Non-Rigid Body Approaches. Plasma Phys. Control. Fusion, in press.
[78] S. Munaretto et al. (2026). Spherical tokamak physics research in preparation for the operation of NSTX-U. Nuclear Fusion, 66, 035001.
[77] B. Vanovac, J. Hobirk, A. O. Nelson, O. Sauter, M. Dunne, M. Faitsch, T. Puetterich, F. Rainer, D. Stieglitz, E. Strumberger, L. Xianzi, O. Grover, A. Kappatou, P. David, G. Tardini, P. Mantica, A. White (2026). ELM suppression and confinement in negative triangularity with stronger shaping in ASDEX Upgrade. Nuclear Fusion, 66, 106040.
[76] Steven McNamara, Shereen Abouelazayem, Aleksandra Alieva, Michail Anastopoulos Tzanis, John Berkery, Aleksei Dnestrovskii, Alexandra Dudkovskaia, Filip Janky, Jisung Kang, Nicolas Lopez, Erik Maartensson, R. Maingi, Chris Marsden, Sergei Medvedev, A.O. Nelson, et al. (2026). Physics Basis for the Reference Flat-Top Plasma Scenario in the ST-E1 Fusion Power Plant. Nuclear Fusion, in review.
[75] J. Salm, A. O. Nelson, C. Hansen, S. Guizzo, C. Paz-Soldan (2026). Poloidal field coils optimization for the MANTA tokamak using TokaMaker. AIP Advances, 16(6), 065113. DOI
[74] A Pajares, H Al Khawaldeh, T H Pederson, V Graber, S T Paruchuri, E Schuster, D Shiraki, F Turco, A. O. Nelson, J-W Juhn, S-H Park, O Kudlacek, F Pastore, A. Mele, O Sauter, I Carvalho, M Baruzzo, H Anand (2026). Cross-machine Density Control Experiments with Relevance for ITER and FPP. Nuclear Materials and Energy, in review.
[73] Renato Perillo, A. Redl, T. Eich, C. J. Lasnier, A. Nelson, R. Rizkallah, D. Silvagni, A. Stagni, J. A. Boedo, A. McLean, P. Traverso, N. Vianello, the DIII-D. Team, J. E. T. Contributors, the ASDEX Upgrade Team, the TCV Team, the EUROfusion Tokamak Exploitation Team (2026). First step toward multi machine ELM energy scalings and extrapolations to SPARC and ITER. Plasma Physics and Controlled Fusion.
[72] Matthew Waller, Zeyu Li, Rachel Myers, Craig Michoski, Brian Sammuli, David Orozco, Ganatma Nakkina, Xi Chen, Tomáš Odstrčil, A O Nelson, Erik Olofsson, Mitchell Clark (2026). Machine Learning for Classification, Dimension Reduction, Cluster- ing, and Feature Importance Analysis of QH-mode Plasma Regimes. Nuclear Fusion.
[71] Mark Kostuk, S. P. Smith, N. Tyler, C. Simpson, S. Denk, B. S. Sammuli, T. Bechtel Amara, A. Deshpande, C. Zuniga, M. Gahl, Z. A. Xing, G. Prechel, C. M. Clark, A. O. Nelson, R. Nazikian (2026). Remote Supercomputing for Between-Shot Fusion Science at DIII-D: Automated Kinetic Equilibria, Neutral Beam Heat-Load Analysis, and a Control-Room Digital Twin. Nuclear Fusion, in review.
[70] C. F. B. Zimmermann, E. M. Bursch, C. Paz-Soldan, J. M. Hanson, N. Leuthold, N. C. Logan, A. O. Nelson (2026). Assessing the Effect of Error Field Penetration During Plasma Current Ramp-Up in the DIII-D Tokamak. Plasma Physics and Controlled Fusion, in review.
[69] S. K. Kim, S. M. Yang, Q. Hu, J.-K. Park, J. H. Lee, Y. H. Lee, J. W. Kim, G. J. Choi, C. Y. Lee, N. C. Logan, A. O. Nelson, et al. (2026). Decoupling of Tokamak Transport Channels under Magnetic Asymmetry. Physical Review Letters.
[68] T. Abrams, F. Effenberg, J. Barr, L. Cappelli, J. D. Coburn, X. Du, D. Ernst, A. Garofalo, M. Groth, J. Herfindal, S. Haskey, S.-H. Hong, A. Lasa, A. G. McLean, A. O. Nelson, et al. (2026). Advancing Fusion Pilot Plant Readiness through the Tungsten Wall Transition on DIII-D. Nuclear Materials and Energy.
[67] The CENTAUR Collaboration et al. (2026). Compact experimental negative triangularity reactor (CENTAUR): a design study for a compact, affordable breakeven tokamak. Plasma Physics and Controlled Fusion, 68(9), 095025. DOI
[66] N. Leuthold, Z. Li, M. Faitsch, A. Hyatt, C. F. B. Zimmermann, L. Gil, T. Osborne, T. Odstrčil, N. C. Logan, K. Barada, C. Chrystal, R. Gerru, S. Guizzo, R. Hood, L. Huse, S. K. Kim, C. J. Lasnier, A. O. Nelson, et al. (2026). Overview of Enhanced D-alpha and Quasi Continuous Exhaust H-modes at DIII-D. Nuclear Fusion, in review.
[65] Jiayi Geng, Zhengxuan Wu, Kevin S. Chen, Seungone Kim, Joseph Janssen, Zora Zhiruo Wang, Bhupalee Kalita, Runtian Gao, Aaron Ho, Andrew Oakleigh Nelson, Olexandr Isayev, Francisco Villaescusa-Navarro, Ching-Yao Lai, Howard Chen, Graham Neubig (2026). EurekaBench: Measuring Agentic Ability to Discover New Scientific Insights. arXiv preprint arXiv:2610.00492. Link

2025

[64] L. Casali, D. Eldon, T. Odstrcil, A. Welsh, K. Lee, A. O. Nelson, C Paz-Soldan, M. G. Burke, T. Cote, F. Khabanov, C. Lasnier, A. McLean, F. Scotti, K. E. Thome, D. Truong (2025). Progress towards Integrated Tokamak Scenarios for Exhaust: experiments and new self-consistent core-edge modeling framework. 2025 IAEA 5th TM on Divertor Concepts.
[63] G. Kramer, A. O. Nelson, K.E. Thome (2025). On the formation of edge electric ﬁelds in negative triangularity plasmas. Plasma Phys. Control. Fusion, 67, 105010.
[62] D Eldon, L Casali, I Bykov, C Chrystal, K Erickson, A W Hyatt, A W Leonard, A L Moser, A O Nelson, T Odstrčil, C Paz-Soldan, T Pederson, F Scotti, H Shen, K E Thome, H Q Wang, A Welsh, T M Wilks (2025). Characterization and controllability of radiated power via extrinsic impurity seeding in strongly negative triangularity plasmas in DIII-D. Plasma Physics and Controlled Fusion, 67(1), 015018. DOI
[61] Filippo Scotti, Alessandro Marinoni, Adam G McLean, Andrew Oakleigh Nelson, et al. (2025). Divertor characterization and access to dissipative divertor conditions in Negative Triangularity discharges in DIII-D. Plasma Physics and Controlled Fusion, 67, 095030. DOI
[60] L Casali, D Eldon, T Odstrcil, R Mattes, A Welsh, K Lee, A O Nelson, C Paz-Soldan, F Khabanov, T Cote, A G McLean, F Scotti, K E Thome (2025). Achievement of highly radiating plasma in negative triangularity and effect of reactor-relevant seeded impurities on confinement and transport. Plasma Physics and Controlled Fusion, 67(2), 025007. DOI
[59] Sophia Guizzo, Mikhail A. Drabinskiy, Christopher Hansen, Aleksandr G. Kachkin, Eduard N. Khairutdinov, Andrew O. Nelson, Maxim R. Nurgaliev, Matthew Pharr, Georgy F. Subbotin, Carlos Paz-Soldan (2025). Electromagnetic System Conceptual Design for a Negative Triangularity Tokamak. Fusion Engineering and Design, 219, 115257. Link
[58] A Lvovskiy, H Anand, A S Welander, M Kochan, C Vincent, G McArdle, J Lovell, Z A Xing, J L Barr, E Cho, B Sammuli, D A Humphreys, N W Eidietis, V Soukhanovskii, A W Leonard, A O Nelson, A Thornton, J Harrison (2025). Framework for assessment of magnetic equilibrium controller performance on the MAST upgrade spherical tokamak. Plasma Physics and Controlled Fusion, 67(7), 075003. DOI
[57] A Rothstein, V Ailiani, K Krogen, A O Nelson, X Sun, M S Kim, W Boyes, N C Logan, Z A Xing, E Kolemen, the DIII-D Team (2025). Assessing the numerical stability of physics models to equilibrium variation through database comparisons on DIII-D. Plasma Physics and Controlled Fusion, 67(11), 115006. DOI
[56] T Cote, G Yu, A O Nelson, N Leuthold, N Richner, S Stewart, F Khabanov, Y Zhu, F Ebrahimi, J King, C Paz-Soldan, L Schmitz, K E Thome, M E Austin, F Scotti (2025). First observations of edge instabilities in strongly shaped negative triangularity plasmas on DIII-D. Plasma Physics and Controlled Fusion, 67(3), 035033. DOI
[55] Azarakhsh Jalalvand, Max Curie, SangKyeun Kim, Jaemin Seo, Peter Steiner, Qiming Hu, Andrew Oakleigh Nelson, Egemen Kolemen, M. Curie, Y.-S Na (2025). Multimodal Super-Resolution: Discovering hidden physics and its application to fusion plasmas. Nature Communications, 16, 8506. Link
[54] Anirban Samaddar, Qian Gong, Sandeep Madireddy, Christopher J Hansen, Semin Joung, David R Smith, Yixuan Sun, Fatima Ebrahimi, Prasanna Balaprakash, Andrew Oakleigh Nelson (2025). Spatiotemporal Forcasting of the Edge Localized Modes in Tokamak Plasmas Using Neural Networks. Machine Learning: Science and Technology, 6, 035041. DOI
[53] R Perillo, J A Boedo, C J Lasnier, A McLean, C Marini, I Bykov, F Glass, A Kapat, A O Nelson, D L Rudakov (2025). First-wall fluxes from large and small ELMs. Physics of Plasmas, 32, 022501. Link
[52] J F Parisi, J W Berkery, A. Sladkomedova, S. Guizzo, M. R. Hardman, J. R. Ball, A. O. Nelson, S. M. Kaye, M. Anastopoulos-Tzanis, S McNamara, J. Dominski, S. Janhunen, M. Romanelli, D. Dickinson, A. Diallo, A. Dnestrovskii, W. Guttenfelder, C. Hansen, O. Myatra, H. R. Wilson (2025). Doubling fusion power with volumetric optimization in magnetic confinement fusion devices. Physical Review Research, 7, 013139. Link
[51] R. Shousha, C. Hansen, A. Maan, A. O. Nelson, D. P. Boyle, S. Banerjee, R. Majeski (2025). Systematic analysis of magnetic equilibrium reconstruction with eddy currents on LTX-β. Nuclear Fusion, 65, 116009. Link
[50] R. Shousha, S.K. Kim, K. Erickson, S. H. Hahn, A. O. Nelson, et al. (2025). Unified ELM Suppression on KSTAR and DIII-D via Adaptive Feedback Control Strategies. Nuclear Fusion, 65, 086021. Link
[49] S. Stewart, G. McKee, C. Chrystal, T. Cote, B. Geiger, F. Khabanov, A. O. Nelson, X. Qin, C. Paz-Soldan, L. Schmitz, K. E. Thome, Z. Yan (2025). Characterization of Turbulence Properties in Negative Triangularity DIII-D Plasmas. Plasma Physics and Controlled Fusion, 67, 025032. Link
[48] M E Fenstermacher, L R Baylor (2025). Progress in pedestal and edge physics Chapter 3 of the special issue: on the path to tokamak burning plasma operation. Nuclear Fusion, 65, 053001.
[47] F. Ebrahimi, T. B. Cote, J. King, A. O. Nelson, N. Leuthold, G. Yu, C. Paz-Soldan (2025). Extended MHD studies of ELM-free negative triangularity plasmas in DIII-D and the CETOP SciDAC-5 project. 2025 Sherwood Fusion Theory Conference.
[46] T. Bechtel Amara, S. P. Smith, Z. A. Xing, T. F. Neiser, C. Simpson, A. O. Nelson, et al. (2025). Accelerating Discoveries at DIII-D With the Integrated Research Infrastructure. Frontiers of Physics, 12, 1524041. DOI

2024

[45] C.T. Holcomb et al. (2024). DIII-D research to provide solutions for ITER and fusion energy. Nuclear Fusion, 64(11), 112003. DOI
[44] Haley S Wilson, Andrew Oakleigh Nelson, Joseph McClenaghan, Pablo Rodriguez-Fernandez, Jason F Parisi, Carlos Paz-Soldan (2024). Characterizing the negative triangularity reactor core operating space with integrated modeling. Plasma Physics and Controlled Fusion, 67, 015026. DOI
[43] J.R. Harrison et al. (2024). Overview of physics results from MAST upgrade towards core-pedestal-exhaust integration. Nuclear Fusion, 64(11), 112017. DOI
[42] The MANTA Collaboration et al. (2024). MANTA: a negative-triangularity NASEM-compliant fusion pilot plant. Plasma Physics and Controlled Fusion, 66(10), 105006. DOI
[41] C. Paz-Soldan, C. Chrystal, P. Lunia, A.O. Nelson, K.E. Thome, M.E. Austin, T.B. Cote, A.W. Hyatt, N. Leuthold, A. Marinoni, T.H. Osborne, M. Pharr, O. Sauter, F. Scotti, T.M. Wilks, H.S. Wilson (2024). Simultaneous access to high normalized density, current, pressure, and confinement in strongly-shaped diverted negative triangularity plasmas. Nuclear Fusion, 64(9), 094002. DOI
[40] S. Guizzo, A. O. Nelson, C. Hansen, F. Logak, C. Paz-Soldan (2024). Assessment of vertical stability for negative triangularity pilot plants. Plasma Physics and Controlled Fusion, 66, 065018. Link
[39] F. Scotti, A. Marinoni, A.G. McLean, C. Paz-Soldan, K.E. Thome, M. Zhao, S. Allen, M. Austin, M.G. Burke, D. Eldon, M. Fenstermacher, A. Hyatt, C.J. Lasnier, A. Leonard, J. Lore, A.O. Nelson, et al. (2024). High performance power handling in the absence of an H-mode edge in negative triangularity DIII-D plasmas. Nuclear Fusion, 64(9), 094001. DOI
[38] S. K. Kim, R. Shousha, S. M. Yang, Q. Hu, S. H. Hahn, A. Jalalvand, J.-K. Park, N. C. Logan, A. O. Nelson, et al. (2024). Highest fusion performance without harmful edge energy bursts in tokamak. Nature Communications, 15(1), 3990. DOI
[37] Craig Michoski, Todd A Oliver, David R Hatch, Ahmed Diallo, Mike Kotschenreuther, David Eldona, Matthew Wallerb, Richard Groebnera, A. O. Nelson (2024). A Gaussian Process Guide for Signal Regression in Magnetic Fusion. Nuclear Fusion, 64, 035001. Link
[36] J.F. Parisi, A.O. Nelson, W. Guttenfelder, R. Gaur, J.W. Berkery, S.M. Kaye, K. Barada, C. Clauser, A. Diallo, D.R. Hatch, A. Kleiner, M. Lampert, T. Macwan, J.E. Menard (2024). Stability and transport of gyrokinetic critical pedestals. Nuclear Fusion, 64(8), 086034. DOI
[35] J. Yang, A.C.C. Sips, P. De Vries, J. Sinha, H.T. Kim, F. Glass, M. Austin, M. Van Zeeland, J.L. Herfindal, M. Shafer, A.O. Nelson, C. Marini, M.G. Yoo (2024). Toroidal injection angle dependence of EC assisted plasma initiation at DIII-D. Nuclear Fusion, 64(12), 126065. DOI
[34] Kathreen E Thome, Max E Austin, A W Hyatt, Alessandro Marinoni, Andrew Oakleigh Nelson, et al. (2024). Overview of results from the 2023 DIII-D Negative Triangularity campaign. Plasma Physics and Controlled Fusion, 66, 105018. DOI
[33] J.F. Parisi, W. Guttenfelder, A.O. Nelson, R. Gaur, A. Kleiner, M. Lampert, G. Avdeeva, J.W. Berkery, C. Clauser, M. Curie, A. Diallo, W. Dorland, S.M. Kaye, J. McClenaghan, F.I. Parra (2024). Kinetic-ballooning-limited pedestals in spherical tokamak plasmas. Nuclear Fusion, 64(5), 054002. DOI
[32] M A Miller, D Arnold, M Wigram, A O Nelson, J Witham, G Rutherford, H Choudhury, C Cummings, C Paz-Soldan, D G Whyte (2024). Power handling in a highly-radiative negative triangularity pilot plant. Plasma Physics and Controlled Fusion, 66(12), 125004. DOI
[31] J McClenaghan, A Marinoni, A O Nelson, T Neiser, L L Lao, G M Staebler, S P Smith, O M Meneghini, B C Lyons, P B Snyder, M Austin (2024). Examining transport and integrated modeling predictive capabilities for negative-triangularity scenarios. Plasma Physics and Controlled Fusion, 66(11), 115008. DOI
[30] Colin Chrystal, Max E Austin, Tomas Odstrcil, Carlos Paz-Soldan, Kathreen E Thome, Alessandro Marinoni, William Samuel Boyes, Thomas H Osborne, Nikolas Logan, A W Hyatt, Andrew Oakleigh Nelson (2024). Eﬀect of rotation on negative triangularity plasmas in DIII-D. Plasma Physics and Controlled Fusion, 66, 105004. DOI
[29] W. Boyes, F. Turco, J. Hanson, G.A. Navratil, A. Turnbull, A. Hyatt, T. Luce, W. Meyer, A.O. Nelson, T. Odstrcil, T. Osborne, F. Scotti, A. Welander, A. Wingen (2024). Novel intrinsic helical cores and MHD dynamo flux pumping evidence in DIII-D. Nuclear Fusion, 64(12), 124005. DOI
[28] J F Parisi, A O Nelson, R Gaur, S M Kaye, F I Parra, J W Berkery, K Barada, C Clauser, A J Creely, A Diallo, W Guttenfelder, J W Hughes, L A Kogan, A Kleiner, A Q Kuang, M Lampert, T Macwan, J E Menard, M A Miller (2024). Kinetic-ballooning-bifurcation in tokamak pedestals across shaping and aspect-ratio. Physics of Plasmas, 31, 030702. Link
[27] C. Hansen, I G Stewart, D. Burgess, M. Pharr, S. Guizzo, F. Logak, A. O. Nelson, C. Paz-Soldan (2024). TokaMaker: An open-source time-dependent Grad-Shafranov tool for the design and modeling of axisymmetric fusion devices. Computer Physics Communications, 298, 109111. Link

2023

[26] G. Yu, Z. Li, G. Kramer, F. Scotti, A. O. Nelson, A. Diallo, C. Lasnier, M. E. Austin, X. Qin, Y. Chen, Y. Zheng, Y. Zhu, N. C. Luhmann (2023). Understanding the negative triangularity ELM trigger and ELM free state on DIII-D with ECE-imaging. Physics of Plasmas, 30, 062505. DOI
[25] R. Singh, P. Diamond, A. O. Nelson (2023). Geometric dependencies of the mean E × B shearing rate in negative triangularity tokamaks. Nuclear Fusion, 63, 126053. Link

2022

[24] Samuel Frank, Conor J Perks, Andrew Oakleigh Nelson, Tony Qian, Suying Jin, Amelia J Cavallaro, Adam Rutkowski, Allan H Reiman, Jeffrey P Freidberg, Pablo Rodriguez-Fernandez, Dennis G Whyte (2022). Radiative pulsed L-mode operation in ARC-class reactors. Nuclear Fusion, 62, 126036. DOI
[23] J. A. Schwartz, A. O. Nelson, E. Kolemen (2022). To dee or not to dee: costs and benefits of altering the triangularity of a steady-state DEMO-like reactor. Nuclear Fusion, 62, 076006. Link
[22] S. K. Kim, R. Shousha, S. H. Hahn, A. O. Nelson, J. Wai, S. M. Yang, J. K. Park, R. Nazikian, Y. M. Jeon, Y. In, J. H. Lee, J. Kim, Y.-S. Na, E. Kolemen (2022). Optimization of 3D controlled ELM-free state with recovered global confinement for tokamak fusion plasmas. Nuclear Fusion, 62, 026043. Link
[21] A. Jalalvand, A. A. Kappatou, A. V. Garcia, A. O. Nelson, J. Abbate, M. Austin, G. Verdoolaege, S. L. Brunton, W. W. Heidbrink, E. Kolemen (2022). Alfvén eigenmode classification based on ECE diagnostics at DIII-D using deep recurrent neural networks. Nuclear Fusion, 62, 026007. Link
[20] T. A. Bechtel, A. O. Nelson, L. L. Lao, Z. A. Xing, S. P. Smith, R. Nazikian, S. Flanagan, D. Schissel, L. Stephey, R. Thomas, S. Williams, O. Antepara, E. Dart, E. Koleman, W. Tang (2022). Accelerated Workflow for Advanced Kinetic Equilibria. 2022 First Combined International Workshop on Interactive Urgent Supercomputing (CIW-IUS), 1–5. DOI
[19] A. O. Nelson, S. Freiberger, H S Wilson, L. Rondini, C. Paz-Soldan (2022). Initial Simulations of Negative Triangularity Plasmas on MAST-U. 21st International Spherical Torus Workshop.
[18] Ehab Hassan, D. R. Hatch, M. R. Halfmoon, M. Curie, M. T. Kotschenreuther, S. M. Mahajan, G. Merlo, R. J. Groebner, A. O. Nelson, A. Diallo (2022). Identifying Microtearing Modes in the pedestal of DIII-D H-modes in Gyrokinetic Simulations. Nuclear Fusion, 62, 026008. Link
[17] R. Shousha, S. K. Kim, K. G. Erickson, S. H. Hahn, A. O. Nelson, S M Yang, J.-K. Park, J. Wai, Y. M. Jeon, J. H. Lee, J. Jang, D. C. Seo, E. Kolemen (2022). Design and experimental demonstration of Feedback Adaptive RMP ELM Controller towards complete long pulse ELM suppression on KSTAR. Physics of Plasmas, 29, 032514. Link
[16] M R Halfmoon, D R Hatch, M T Kotschenreuther, S. M. Mahajan, A. O. Nelson, E. Kolemen, M. Curie, A. Diallo, R. J. Groebner, E. Hassan, E. A. Belli, J. Candy (2022). Gyrokinetic analysis of inter-edge localized mode transport mechanisms in a DIII-D pedestal. Physics of Plasmas, 29, 112505. Link
[15] M. E. Fenstermacher et al. (2022). DIII-D research advancing the physics basis for optimizing the tokamak approach to fusion energy. Nuclear Fusion, 62(4), 042024. DOI
[14] M. Curie, J. L. Larakers, D. Hatch, A. O. Nelson, A. Diallo, E. Hassan, W. Guttenfelder, M. Halfmoon, M. Kotschenreuther, R. D. Hazeltine, S. M. Mahajan, R. J. Groebner, J. Chen, C. Perez von Thun, L. Frassinetti, S. Saarelma, C. Giroud, M. Tennery (2022). A survey of pedestal magnetic fluctuations using gyrokinetics and a global reduced model for microtearing stability. Physics of Plasmas, 29, 042503. Link

2021

[13] Viraj Mehta, Ian Char, Willie Neiswanger, Youngseog Chung, A. O. Nelson, Mark D Boyer, Egemen Kolemen, Jeff Schneider (2021). Neural Dynamical Systems: Balancing Structure and Flexibility in Physical Prediction. 2021 60th IEEE Conference on Decision and Control (CDC), 3735–3742. Link
[12] Z.A. Xing, D. Eldon, A. O. Nelson, M. A. Roelofs, W. J. Eggert, O. Izacard, A.S. Glasser, N.C. Logan, O. Meneghini, S. P. Smith, R. Nazikian, E. Kolemen (2021). CAKE: Consistent Automatic Kinetic Equilibrium reconstruction. Fusion Engineering and Design, 163, 112163. DOI
[11] E. J. Strait, S. Munaretto, R. M. Sweeney, N. C. Logan, A. O. Nelson (2021). Electromagnetic torque measurements in DIII-D using internal/external magnetic field decomposition. Review of Scientific Instruments, 92, 043516. DOI
[10] S. K. Kim, R. Shousha, S. H. Hahn, A. O. Nelson, J. Wai, S. M. Yang, J. K. Park, Y. In, J. H. Lee, J. Kim, E. Kolemen (2021). Effect of n=1 RMP-driven Turbulence on Ion Pedestal and its role in Adaptive ELM control in KSTAR. Proceedings of 47th EPS Conference on Plasma Physics, P4, 1067. Link

2020

[9] Youngseog Chung, Ian Char, Willie Neiswanger, Kirthevasan Kandasamy, A. O. Nelson, Mark D Boyer, Egemen Kolemen, Jeff Schneider (2020). Offline Contextual Bayesian Optimization for Nuclear Fusion. Machine Learning and the Physical Sciences Workshop at the 33rd Conference on Neural Information Processing Systems (NeurIPS), 1–12. Link
[8] R. Fitzpatrick, A. O. Nelson (2020). An improved theory of the response of DIII-D H-mode discharges to static resonant magnetic perturbations and its implications for the suppression of edge localized modes. Physics of Plasmas, 27, 072501. DOI
[7] J. T. Wai, P. J. Vail, A. O. Nelson, Z. A. Xing, C. Lasnier, E. Kolemen (2020). Infrared Constrained Equilibria and Application to Snowflake Divertor Studies. Nuclear Materials and Energy, 25, 100835. DOI
[6] F. M. Laggner, David Eldon, A. O. Nelson, Carlos Paz-Soldan, Alessandro Bortolon, Todd E Evans, Max E Fenstermacher, Brian A Grierson, Qiming Hu, Dave A Humphreys, A W Hyatt, Raffi Nazikian, O Meneghini, Philip B Snyder, Ezekial A Unterberg, Egemen Kolemen (2020). Real-time pedestal optimization and ELM control with 3D fields and gas flows on DIII-D. Nuclear Fusion, 60, 076004. DOI

2019

[5] Y. Yang, L. Buzi, A. O. Nelson, R. Kaita, B. E. Koel (2019). Post exposure time dependence of deuterium retention in lithium and lithium compounds. Nuclear Materials and Energy, 19, 161–165. DOI
[4] Ian Char, Youngseog Chung, Willie Neiswanger, Kirthevasan Kandasamy, A. O. Nelson, Mark D Boyer, Egemen Kolemen (2019). Offline Contextual Bayesian Optimization. Advances in Neural Information Processing Systems 32, 4629–4640. Link
[3] L. Buzi, A. O. Nelson, Y. Yang, R. Kaita, P. S. Krstić, B. E. Koel (2019). Sputtering of lithium and lithium compound films under deuterium and helium ion bombardment. Nuclear Materials and Energy, 19, 411–415. DOI

2018

[2] L. Buzi, Y. Yang, F. J. Domínguez-Gutiérrez, A. O. Nelson, M. Hofman, P. S. Krstić, R. Kaita, B. E. Koel (2018). Hydrogen retention in lithium and lithium oxide films. Journal of Nuclear Materials, 502, 161–168. DOI

2014

[1] E. N. Grossman, O. D. Friedman, A. O. Nelson (2014). Non-Imaging Winston Cone Concentrators for Submillimeter-Wave, Overmoded Waveguide. IEEE Transactions on Terahertz Science and Technology, 4(1), 65–74. DOI