Legolas, short for Large Eigensystem Generator for One-dimensional pLASmas, is a novel finite element code tailored to (M)HD spectroscopy of 3D Cartesian/cylindrical equilibria with nontrivial 1D variation. The code includes a myriad of physical effects, most of which are fully user-customisable.

Getting started

Legolas is written in object-oriented Fortran (2008 standard) with a complementary Python framework (Pylbo) used for post-processing, data analysis, interfacing and parallel running. Both source codes are extensively documented and we provide a detailed guide on how to get started with the code.

I want to get started


We are happy to answer any questions you may have in using Legolas and/or Pylbo. Feel free to open an issue in the GitHub repository or start a Discussion thread there. We also have a dedicated Slack workspace, which you can also use to ask questions or have a nice chat with the developers. You can also just send us an e-mail.

Join legolas @ Slack!


Legolas is supported by funding from the European Research Council (ERC) under the European Unions Horizon 2020 research and innovation programme, Grant agreement No. 833251 PROMINENT ERC-ADG 2018; from the VSC (Flemish Supercomputer Center), funded by the Research Foundation – Flanders (FWO) and the Flemish Government – department EWI; and from Internal Funds KU Leuven, project C14/19/089 TRACESpace.

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What Legolas can do

Legolas can do a multitude of things, ranging from full spectrum calculations to eigenfunctions of specific modes, to full-on parametric studies of various equilibrium configurations in different geometries. You can take a look at all the various equilibria that are already implemented, or read more on our About section.

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Using Legolas

Legolas is the result of months and months of development and testing. Since this takes a lot of effort and time, we kindly ask that the first published peer-reviewed paper from applying Legolas is done in co-authorship with at least one of the original authors. Additionally, if you use Legolas in a publication we kindly request that you cite the code paper.

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