From f64a035d72ce4f4f6a16383a8615e5e018bbab89 Mon Sep 17 00:00:00 2001
From: Timothy Nunn <timothy.nunn@ukaea.uk>
Date: Mon, 6 Jul 2026 15:48:50 +0100
Subject: [PATCH] Allow detailed physics profile output to be switched off

---
 process/data_structure/global_variables.py |  5 +++++
 process/main.py                            | 10 ++++++++++
 process/models/physics/physics.py          |  2 ++
 3 files changed, 17 insertions(+)

diff --git a/process/data_structure/global_variables.py b/process/data_structure/global_variables.py
index f3e9849c3e..1b7e89305d 100644
--- a/process/data_structure/global_variables.py
+++ b/process/data_structure/global_variables.py
@@ -35,5 +35,10 @@ class GlobalData:
     convergence_parameter: float = 0.0
     """VMCON convergence parameter 'sum'"""
 
+    no_profiles: bool = False
+    """Reduces the amount of output written to the MFile
+    by stopping detailed physics profiles from being written.
+    """
+
 
 CREATE_DICTS_FROM_DATACLASS = GlobalData
diff --git a/process/main.py b/process/main.py
index bfe683a62d..bca2df3e93 100644
--- a/process/main.py
+++ b/process/main.py
@@ -184,6 +184,12 @@
     is_flag=True,
     help="Run all summary plotting scripts for the output",
 )
+@click.option(
+    "--no-profiles",
+    is_flag=True,
+    help="Reduces the amount of output written to the MFile by removing "
+    "detailed physics profiles.",
+)
 @click.pass_context
 def process_cli(
     ctx,
@@ -195,6 +201,7 @@ def process_cli(
     mfilejson,
     update_obsolete,
     full_output,
+    no_profiles,
 ):
     """
     \b
@@ -223,6 +230,9 @@ def process_cli(
                 indat, solver, update_obsolete=update_obsolete, filepath_out=mfile_path
             )
 
+        if no_profiles:
+            runtype.data.globals.no_profiles = True
+
         runtype.run()
 
         mfile_path = runtype.mfile_path
diff --git a/process/models/physics/physics.py b/process/models/physics/physics.py
index 17e9a0bec7..49a4036b7a 100644
--- a/process/models/physics/physics.py
+++ b/process/models/physics/physics.py
@@ -5895,6 +5895,8 @@ def calculate_spitzer_resistivity(
 
     def output_detailed_physics(self):
         """Outputs detailed physics variables to file."""
+        if self.data.globals.no_profiles:
+            return
         po.oheadr(self.outfile, "Detailed Plasma")
 
         po.osubhd(self.outfile, "Debye lengths:")