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Add setting to optionally disable atomic relaxation (#3855)

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Co-authored-by: Paul Romano <paul.k.romano@gmail.com>
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Amanda Lund 2026-03-09 23:00:10 -05:00 • committed by GitHub
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12 changed files with 150 additions and 9 deletions
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13
docs/source/io_formats/settings.rst
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@ -7,6 +7,19 @@ Settings Specification -- settings.xml
All simulation parameters and miscellaneous options are specified in the
settings.xml file.
-------------------------------
``<atomic_relaxation>`` Element
-------------------------------
The ``<atomic_relaxation>`` element determines whether the atomic relaxation
cascade, the X-ray fluorescence photons and Auger electrons emitted when an
inner-shell vacancy is filled, is simulated following photoelectric and
incoherent (Compton) scattering interactions. Disabling this can speed up
photon transport calculations where the detailed secondary particle cascade is
not of interest.
*Default*: true
---------------------
``<batches>`` Element
---------------------

7
docs/source/usersguide/settings.rst
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@ -604,6 +604,13 @@ transport::
settings.photon_transport = True
Atomic relaxation (the cascade of fluorescence photons and Auger electrons
emitted when an inner-shell vacancy is filled) is enabled by default whenever
photon transport is on. It can be disabled using the
:attr:`Settings.atomic_relaxation` attribute::
settings.atomic_relaxation = False
The way in which OpenMC handles secondary charged particles can be specified
with the :attr:`Settings.electron_treatment` attribute. By default, the
:ref:`thick-target bremsstrahlung <ttb>` (TTB) approximation is used to generate