Error Trying to run sample openmc-plasma-source script

User Support
1

I installed openmc from source on Linux (Ubuntu 20.04.4) and am trying to use a separate package with it, called “openmc-plasma-source,” but when I try and run the sample script from its Github I get this:

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             | The OpenMC Monte Carlo Code
   Copyright | 2011-2022 MIT, UChicago Argonne LLC, and contributors
     License | https://docs.openmc.org/en/latest/license.html
     Version | 0.13.0
    Git SHA1 | cff247e35785e7236d67ccf64a3401f0fc50a469
   Date/Time | 2022-03-06 18:25:07

OpenMP Threads | 8

Reading settings XML file…
ERROR: No cross_sections.xml file was specified in materials.xml or in the
OPENMC_CROSS_SECTIONS environment variable. OpenMC needs such a file to
identify where to find data libraries. Please consult the user’s guide
at https://docs.openmc.org/ for information on how to set up data
libraries.
Traceback (most recent call last):
File “plasma.py”, line 64, in
model.run()
File “/home/agilan/.local/lib/python3.8/site-packages/openmc/model/model.py”, line 580, in run
openmc.run(particles, threads, geometry_debug, restart_file,
File “/home/agilan/.local/lib/python3.8/site-packages/openmc/executor.py”, line 276, in run
_run(args, output, cwd)
File “/home/agilan/.local/lib/python3.8/site-packages/openmc/executor.py”, line 116, in _run
raise RuntimeError(error_msg)
RuntimeError: No cross_sections.xml file was specified in materials.xml or in the OPENMC_CROSS_SECTIONS environment variable. OpenMC needs such a file to identify where to find data libraries.

Does anyone know why this error is occurring?

2

I am not too sure, but try typing this into your terminal once you enter the openmc conda environment (openmc-env)

export=OPENMC_CROSS_SECTIONS=Path to Cross Section File

In “Path to Cross Section File” make sure that it goes something like

/home/…/…/…/cross_sections.xml

3

@hacer Please see the user’s guide section on cross section configuration, which explains the OPENMC_CROSS_SECTIONS environment variable as well as where to find cross section libraries.