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Add missing photon_sample_fraction parameter to QED block #4

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Add missing photon_sample_fraction parameter to QED block #4

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6 changes: 6 additions & 0 deletions content/documentation/input_deck/Input_deck_qed.md
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Expand Up @@ -39,6 +39,12 @@ the emitted photons are not tracked. The default is "F".
Radiation reaction is calculated for photons of all energies, but
photons with energy below this cutoff are not tracked. The default is 0.

- `photon_sample_fraction` - Downscales photon production by only
producing photons during emissions events at the given rate while
increasing the weight of emitted photons by a factor of the reciprocal
of the fraction in order to preserve total real photons. This needs to be
a number in the range of 0 to 1. The default is 1.

- `photon_dynamics` - Logical flag which specifies whether
to push photons. If "F" then photons are generated, but their motion
through the domain is not simulated and they stay where they were
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