DOI: 10.14468/07jt-s540
title: OpenSTEP: public data release of the STEP Prototype Powerplant scenario SPP-001

description: This dataset contains a curated set of results from key physics simulations performed at UKAEA for the STEP Prototype Power Plant, version 1 (SPP-001). It includes the coilset, equilibrium, and kinetic profiles of the STEP plasma scenario.

The free-boundary equilibrium was computed using Fiesta, a Grad-Shafranov equilibrium solver. Kinetic profiles were simulated using JINTRAC, a 1.5D integrated modelling code incorporating transport, heating, current drive, fuelling, and fixed-boundary equilibrium updates. 

The original data was published in the following papers:
(1) Hudoba, A., et al. "Optimisation of the poloidal field system for advanced divertor configurations in STEP." Nuclear Fusion 64.8 (2024): 086055,
(2) Tholerus, E., et al. "Flat-top plasma operational space of the STEP power plant." Nuclear Fusion 64.10 (2024): 106030.
description: The free-boundary equilibrium data includes:
(1) equilibrium IDS, containing free-boundary equilibrium,
(2) pf_active IDS, containing the coilset and currents,
(3) wall IDS, containing a limiter point only.

The transport data includes:
(1) core_profiles IDS,
(2) core_sources IDS,
(3) core_transport IDS,
(4) equilibrium IDS, containing a fixed boundary equilibrium consistent with the kinetic profiles.
description: NAME,SIZE,TYPE,EXT,LAST_MODIFIED,FORMAT_NAME,MIME_TYPE
openstep.tar.gz,9501154,Container,gz,2025-10-09T13:41:33,GZIP Format,application/gzip
openstep.tar,16076800,Container,tar,,Tape Archive Format,application/x-tar
openstep,,Folder,,2025-10-09T13:41:42,,
scripts,,Folder,,2025-10-09T13:41:42,,
README.md,7075,File,md,2025-10-09T13:16:15,Markdown,text/markdown
LICENSE.txt,18657,File,txt,2023-09-11T22:49:41,Plain Text File,text/plain
plot_equilibrium.ipynb,182209,File,ipynb,2025-10-08T14:13:41,Jupyter Python Notebook,
fiesta_to_imas.m,840,File,m,2025-09-27T13:54:46,,
free_boundary.png,2068807,File,png,2025-10-08T14:13:03,Portable Network Graphics,image/png
plot_ftop.ipynb,95962,File,ipynb,2025-10-08T14:19:22,Jupyter Python Notebook,
ec-hd,,Folder,,2025-10-09T13:41:42,,
ftop,,Folder,,2025-10-09T13:41:42,,
_src,,Folder,,2025-10-09T13:41:42,,
imas_to_nc.py,706,File,py,2025-09-29T11:53:00,Python Script File,
ftop.png,995896,File,png,2025-10-08T14:13:38,Portable Network Graphics,image/png
jetto.ssp1,21724,File,ssp1,2025-10-09T13:25:37,,
jetto.sst1,1776,File,sst1,2025-10-09T13:25:37,,
jetto.ssp2,10296,File,ssp2,2025-10-09T13:25:37,,
jetto.sst2,1484,File,sst2,2025-10-09T13:25:37,,
jetto.eqdsk_out,384341,File,eqdsk_out,2025-10-09T13:25:37,,
imasdb,,Folder,,2025-10-09T13:41:42,,
ntms.h5,13096,File,h5,2025-10-08T13:14:42,,application/x-hdf5
jetto.sst,380,File,sst,2025-10-09T13:23:35,,
jetto.jsp,176330,File,jsp,2025-10-09T13:23:35,Java Servlet Page,text/html
jetto.sst3,1995,File,sst3,2025-10-09T13:25:37,,
jetto.jst,17781,File,jst,2025-10-09T13:23:35,,
jetto.ssp3,30295,File,ssp3,2025-10-09T13:25:37,,
jetto.ssp,5190,File,ssp,2025-10-09T13:23:35,,
core_sources.h5,176192,File,h5,2025-10-08T13:14:42,,application/x-hdf5
core_transport.h5,336896,File,h5,2025-10-08T13:14:42,,application/x-hdf5
master.h5,2400,File,h5,2025-10-08T13:14:42,,application/x-hdf5
STEP_SPP_001_ECHD_ftop.nc,1260824,File,nc,2025-10-08T10:01:03,HDF5,application/x-netcdf
CITATION.cff,1990,File,cff,2025-10-09T13:28:13,,
eb-cc,,Folder,,2025-10-09T13:41:42,,
ftop,,Folder,,2025-10-09T13:41:42,,
_src,,Folder,,2025-10-09T13:41:42,,
datacite_entry.xml,8268,File,xml,2025-10-09T13:26:10,,text/xml
jetto.ssp3,30295,File,ssp3,2025-10-09T13:25:37,,
jetto.sst2,1484,File,sst2,2025-10-09T13:25:37,,
jetto.sst1,1776,File,sst1,2025-10-09T13:25:37,,
jetto.ssp2,10296,File,ssp2,2025-10-09T13:25:37,,
jetto.sst3,1995,File,sst3,2025-10-09T13:25:37,,
jetto.ssp1,21724,File,ssp1,2025-10-09T13:25:37,,
jetto.jst,17781,File,jst,2025-10-09T13:21:50,,
jetto.eqdsk_out,384341,File,eqdsk_out,2025-10-09T13:25:37,,
jetto.sst,380,File,sst,2025-10-09T13:21:50,,
jetto.ssp,5190,File,ssp,2025-10-09T13:21:50,,
core_profiles.h5,452820,File,h5,2025-10-08T13:14:42,,application/x-hdf5
imasdb,,Folder,,2025-10-09T13:41:42,,
jetto.jsp,176330,File,jsp,2025-10-09T13:21:50,Java Servlet Page,text/html
summary.h5,224079,File,h5,2025-10-08T13:14:42,,application/x-hdf5
ntms.h5,13096,File,h5,2025-10-08T13:48:16,,application/x-hdf5
master.h5,2400,File,h5,2025-10-08T13:47:13,,application/x-hdf5
freeboundary,,Folder,,2025-10-09T13:41:42,,
_src,,Folder,,2025-10-09T13:41:42,,
STEP_SPP_001_EBCC_ftop.nc,1262321,File,nc,2025-10-08T13:47:38,HDF5,application/x-netcdf
jetto.eqdsk_out,384341,File,eqdsk_out,2025-10-08T16:36:32,,
coilset.mat,9164,File,mat,2025-10-08T16:53:52,Level 5 MAT-file format (MATLAB),
equilibrium.mat,1740703,File,mat,2025-10-08T16:53:52,Level 5 MAT-file format (MATLAB),
core_sources.h5,177016,File,h5,2025-10-08T13:47:13,,application/x-hdf5
imasdb,,Folder,,2025-10-09T13:41:42,,
summary.h5,224090,File,h5,2025-10-08T13:47:13,,application/x-hdf5
master.h5,2216,File,h5,2025-10-08T13:14:12,,application/x-hdf5
wall.h5,94128,File,h5,2025-10-08T13:14:12,,application/x-hdf5
core_transport.h5,336864,File,h5,2025-10-08T13:47:13,,application/x-hdf5
STEP_SPP_001_EBCC_freeboundary.nc,1273723,File,nc,2025-10-02T14:55:14,HDF5,application/x-netcdf
pf_active.h5,111701,File,h5,2025-10-08T13:14:12,,application/x-hdf5
equilibrium.h5,780947,File,h5,2025-10-08T13:14:42,,application/x-hdf5
core_profiles.h5,453056,File,h5,2025-10-08T13:47:13,,application/x-hdf5
equilibrium.h5,778660,File,h5,2025-10-08T13:47:13,,application/x-hdf5
equilibrium.h5,1230708,File,h5,2025-10-08T13:14:12,,application/x-hdf5
description: Programme Area:STEP