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Continuous kludge to keep pdivt > 0 #3579

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Merged
jonmaddock merged 1 commit into from
Mar 17, 2025
Merged

Continuous kludge to keep pdivt > 0 #3579

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9 changes: 6 additions & 3 deletions process/physics.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2240,9 +2240,12 @@ def physics(self):
- physics_variables.p_plasma_rad_mw
)

# The following line is unphysical, but prevents -ve sqrt argument
# Should be obsolete if constraint eqn 17 is turned on
physics_variables.pdivt = max(0.001e0, physics_variables.pdivt)
# KLUDGE: Ensure pdivt is continuously positive (physical, rather than
# negative potential power), as required by other models (e.g.
# Physics.calculate_density_limit())
physics_variables.pdivt = physics_variables.pdivt / (
1 - np.exp(-physics_variables.pdivt)
)

# if double null configuration share the power
# over the upper and lower divertor, where physics_variables.ftar gives
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