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Add plasma neutron surface power #4087

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Merged
timothy-nunn merged 3 commits into from
Feb 10, 2026
Merged

Add plasma neutron surface power #4087

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1849ca2
Add average neutron flux variable for plasma surface
chris-ashe Feb 8, 2026
5d59c77
Add average neutron flux calculation for plasma surface
chris-ashe Feb 8, 2026
43e060e
Add average neutron flux display in plasma information plot
chris-ashe Feb 8, 2026
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5 changes: 5 additions & 0 deletions process/data_structure/physics_variables.py
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Original file line number Diff line number Diff line change
Expand Up @@ -1283,6 +1283,9 @@
pflux_fw_neutron_mw: float = None
"""average neutron wall load (MW/m2)"""

plfux_plasma_surface_neutron_avg_mw: float = None
"""Average neutron flux at plasma surface (MW/m2)"""


wtgpd: float = None
"""mass of fuel used per day (g)"""
Expand Down Expand Up @@ -1630,6 +1633,7 @@ def init_physics_variables():
vs_plasma_res_ramp, \
vs_plasma_total_required, \
pflux_fw_neutron_mw, \
plfux_plasma_surface_neutron_avg_mw, \
wtgpd, \
a_plasma_poloidal, \
n_charge_plasma_effective_vol_avg, \
Expand Down Expand Up @@ -1893,6 +1897,7 @@ def init_physics_variables():
vs_plasma_res_ramp = 0.0
vs_plasma_total_required = 0.0
pflux_fw_neutron_mw = 0.0
plfux_plasma_surface_neutron_avg_mw = 0.0
wtgpd = 0.0
a_plasma_poloidal = 0.0
n_charge_plasma_effective_vol_avg = 0.0
Expand Down
5 changes: 3 additions & 2 deletions process/io/plot_proc.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2870,12 +2870,13 @@ def plot_main_plasma_information(
)

textstr_neutron = (
f"$P_{{\\text{{n,total}}}}$ {mfile.get('p_neutron_total_mw', scan=scan):.2f} MW"
f"$P_{{\\text{{n,total}}}}$ {mfile.get('p_neutron_total_mw', scan=scan):.2f} MW \n"
f"$\\phi_{{\\text{{n,avg}}}}$ {mfile.get('plfux_plasma_surface_neutron_avg_mw', scan=scan):.3f} MW/m²"
)

axis.text(
0.775,
0.85,
0.875,
textstr_neutron,
fontsize=9,
verticalalignment="top",
Expand Down
12 changes: 12 additions & 0 deletions process/physics.py
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Original file line number Diff line number Diff line change
Expand Up @@ -2494,6 +2494,10 @@ def physics(self):
- physics_variables.p_plasma_rad_mw
)

physics_variables.plfux_plasma_surface_neutron_avg_mw = (
physics_variables.p_neutron_total_mw / physics_variables.a_plasma_surface
)

# KLUDGE: Ensure p_plasma_separatrix_mw is continuously positive (physical, rather than
# negative potential power), as required by other models (e.g.
# Physics.calculate_density_limit())
Expand Down Expand Up @@ -5646,6 +5650,14 @@ def outplas(self):
physics_variables.pflux_fw_rad_mw,
"OP ",
)
po.ovarre(
self.outfile,
"Average neutron flux at plasma surface (MW/m^2)",
"(plfux_plasma_surface_neutron_avg_mw)",
physics_variables.plfux_plasma_surface_neutron_avg_mw,
"OP ",
)

po.ovarre(
self.outfile,
"Peaking factor for radiation first-wall load",
Expand Down
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