Princeton Plasma Physics Laboratory

TRANSP for interpretive & predictive analysis of tokamak plasmas

Model integrated heating, current drive, turbulence, and MHD stability with a production-proven workflow used across DIII‑D, NSTX‑U, MAST-U and more. Built to interoperate with IMAS and modern HPC.

~300 users
running TRANSP
1000+ papers
citing TRANSP.
Open
Academic license

Research highlights

Selected results from the fast-ion and power balance analyses for the STAR tokamak using the NUBEAM module in TRANSP.

Fast-ion density map with separatrix outline, pitch–energy panel, and power balance vs time.
Fast ions

Beam-driven fast-ion behavior

Poloidal density map (a), pitch–energy distribution (b), and Pbeam/Pcx/Porbit (c).

Power losses distribution for He4 fusion in STAR-LM across poloidal section.
Power balance

He-4 power losses in STAR-LM

Spatial loss distribution and total deposited power summary.

Do more with TRANSP

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GX integration

GPU-accelerated gyrokinetic flux model for turbulence-aware transport.

Docs What’s new
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IMAS & Data

IMAS-friendly I/O to simplify cross‑device analysis and code coupling.

Enabling IMAS inputs in TRANSP TRANSP IMAS tools
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Run anywhere

Docker images for a consistent, reproducible environment.

Docker guide
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Get help

Reach the team, report an issue, or request a feature.

Contact us

Documentation

Top links below — search all docs.

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FAQ & How‑to

Answers to common questions and workflows.
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Docker guide

Run TRANSP in a reproducible container.
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TRANSP output

Browse the output variables and formats.
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TGLF module

Transport model configuration and details.

Tutorials

Top tutorials below — find more.

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Intro for users

Slides from a user tutorial session.
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Equilibrium options

Overview of EFIT and alternatives.
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DIII‑D setup

How to set up runs for DIII‑D.
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MAST‑U setup

How to set up runs for MAST‑U.

Latest news

October 2025Release
TRANSP v24.8 released — TGLF surrogates and RMP models for DIII-D pedestal
September 2025Feature
GPEC interface, and new pedestal models
Read more
All releases