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Project Description

Overview

This program is a Particle-In-Cell (PIC) code, whose distinctive feature is to use a spectral decomposition in cylindrical geometry for the fields (Fourier-Bessel decomposition).

This decomposition allows to combine the advantages of spectral 3D Cartesian PIC codes (high accuracy and stability) and those of finite-difference cylindrical PIC codes with azimuthal decomposition (orders-of-magnitude speedup when compared to 3D simulations). Here are some of the specific features of this code :

  • The Maxwell solver uses a Pseudo-Spectral Analytical Time-Domain algorithm (PSATD), and is therefore dispersion-free in all directions, in vacuum.
  • The fields E and B are defined at the same points in space and at the same time (i.e. they are not staggered). This avoids some interpolation errors.
  • The particle pusher uses the Vay algorithm.
  • The moving window is supported.
  • The initialization of charged bunch (with its space-charge fields) is supported.

For more details on the algorithm, see the docs/article folder.

Implementation details:

  • The code is written in Python and calls BLAS and FFTW for computationally intensive parts. Moroever, it will also use Numba, if availabe
  • Single-CPU (with partial use of multi-threading) or single-GPU

Installation

The installation instructions below are for a local computer. For instructions specific to a particular HPC cluster (e.g. Titan, Jureca, Lawrencium, etc.), please see docs/install.

The recommended installation is through the Anaconda distribution:

  • If Anaconda is not your default Python installation, download and install it from here.

  • Clone the fbpic repository using git.

  • cd into the top folder of fbpic and install the dependencies:

    conda install -c conda-forge --file requirements.txt
    
  • Optional: In order to be able to run the code on a GPU:

    conda install accelerate
    conda install accelerate_cudalib
    

    (The accelerate package is not free, but there is a 30-day free trial period, which starts when the above command is entered. For further use beyond 30 days, one option is to obtain an academic license, which is also free. To do so, please visit this link.)

  • Install fbpic

    python setup.py install
    

The installation can be tested by running:

python setup.py test

If you encounter issues with the installation, you may find a documented solution in docs/install.

Running simulations

Simulations are run with a user-written python script, which calls the FBPIC structures. An example script (called lpa_sim.py) can be found in docs/example_input. The simulation can be run simply by entering python -i lpa_sim.py.

The code outputs HDF5 files, that comply with the OpenPMD standard, and which can thus be read as such (e.g. by using the openPMD-viewer).

Release History

Release History

0.1.0

This version

History Node

TODO: Figure out how to actually get changelog content.

Changelog content for this version goes here.

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File Name & Checksum SHA256 Checksum Help Version File Type Upload Date
fbpic-0.1.0-py3-none-any.whl (122.6 kB) Copy SHA256 Checksum SHA256 py3 Wheel Sep 23, 2016
fbpic-0.1.0.tar.gz (98.3 kB) Copy SHA256 Checksum SHA256 Source Sep 23, 2016

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