Nathaniel Chen
About

PhD candidate.

Nathaniel Chen

I'm a Ph.D. candidate in Mechanical & Aerospace Engineering at Princeton, working with Egemen Kolemen in the Plasma Control Group, joint with PPPL. I work on foundation models for fusion data, the real-time signal pipelines that feed them, and the control systems that turn both into something a tokamak can actually use.

I started the Ph.D. in March 2025 after finishing my M.A. at Princeton MAE. Before that I studied physics and cognitive science at UCLA, founded the American Nuclear Society chapter there, and co-founded the California Neurotech Conference (CNTC).

I'm a 2026 Princeton AI Lab Graduate Student Fellow. I've led a real-time ML control experiment at the DIII-D National Fusion Facility and sped up the ORBIT-GPU plasma simulator by 20× on CUDA. Outside research: TKD, the Scully Food Co-Op, the Anime/Manga club, and tuba.

Education

Princeton University
Ph.D., Mechanical & Aerospace Engineering · Plasma Control Group
Mar 2025 — Present
Princeton University
M.A., Mechanical & Aerospace Engineering
Jun 2023 — Mar 2025
University of California, Los Angeles
B.S. Physics & B.S. Cognitive Science (Specialization in Computation)
Aug 2019 — Jun 2023

Research experience

Graduate Researcher — Princeton MAE / PPPL
Plasma Control Group · advised by Egemen Kolemen
Jul 2023 — Present
  • Led the first-of-kind real-time ML-enabled emission front control experiment at the DIII-D National Fusion Facility.
  • Developing foundation models for tokamak plasma data.
  • Built TokEye, a fast signal-extraction pipeline for fluctuating tokamak time series.
Cognitive ML Research Assistant — UCLA Psychology
Hongjing Lu lab
Jan 2023 — Jun 2023
  • Developed reinforcement learning models for visual perception tasks.
Nuclear Physics Research Assistant — UCLA
Physics & Astronomy · Huan Huang lab
Aug 2022 — Jun 2023
  • Contributed to Glauber model verification analyses for heavy-ion collisions.
Plasma Modeling Summer Intern — Princeton Plasma Physics Lab
Mario Podesta
Jun 2022 — Aug 2022
  • Improved simulation speed of ORBIT-GPU by 20× on CUDA.
Biophysics Research Assistant — UCLA
Physics & Psychology · Katsushi Arisaka lab
Oct 2019 — Feb 2022
  • Investigated 3D visual perception of space and shape; co-authored bioRxiv preprint (2022).
Engram Independent Researcher — UCLA Chemistry
Paul Weiss lab
Jan 2020 — Mar 2020
Bioengineering Research Assistant — UCSD
Milan Makale lab
Jun 2017 — Feb 2019

Publications & talks

Towards Large-Scale Heterogeneous Data Organization for Scientific Foundation Models
ICLR 2026 Workshop DATA-FM
Apr 2026
TokEye: Fast Signal Extraction for Fluctuating Time Series
arXiv preprint
Feb 2026
Beyond the Loss Curve: Scaling Laws, Active Learning
arXiv preprint
Feb 2026
Regulation Compliant AI for Fusion
Nuclear Fusion
Feb 2026

Acknowledged in 1000 Layer Networks for Self-Supervised RL (NeurIPS 2025 Best Paper Award) for debugging experiments and HPC infrastructure.

Honors

Princeton Artificial Intelligence Lab Graduate Student Fellow
2026
UCLA College of Letters & Sciences Dean's List
2021
UCLA College of Letters & Sciences Honors Scholars Program
2019

Skills

Programming: Python, PyTorch, MATLAB, C/C++ (CUDA), Bash, Mathematica.
Software & tools: LaTeX, OpenBCI, Microsoft Office Suite, Blender, Photoshop, CAD (SolidWorks, Fusion 360).
Languages: English, Mandarin, Japanese.