From a407a2cc81de5383edd54e43d6d849ebe39fb82e Mon Sep 17 00:00:00 2001
From: Marco Giacalone <mgiacalo@gmail.com>
Date: Wed, 12 Nov 2025 11:44:21 +0100
Subject: [PATCH] Forward interaction rate to collision context

---
 DataFormats/simulation/src/DigitizationContext.cxx | 1 +
 Steer/src/CollisionContextTool.cxx                 | 8 ++++++++
 2 files changed, 9 insertions(+)

diff --git a/DataFormats/simulation/src/DigitizationContext.cxx b/DataFormats/simulation/src/DigitizationContext.cxx
index b05889300340c..79e36aa9fa48b 100644
--- a/DataFormats/simulation/src/DigitizationContext.cxx
+++ b/DataFormats/simulation/src/DigitizationContext.cxx
@@ -699,6 +699,7 @@ DigitizationContext DigitizationContext::extractSingleTimeframe(int timeframeid,
   r.mSimPrefixes = mSimPrefixes;
   r.mMuBC = mMuBC;
   r.mBCFilling = mBCFilling;
+  r.mDigitizerInteractionRate = mDigitizerInteractionRate;
   try {
     auto tf_ranges = timeframeindices.at(timeframeid);
 
diff --git a/Steer/src/CollisionContextTool.cxx b/Steer/src/CollisionContextTool.cxx
index 710476bed32f9..6a2fca20afe76 100644
--- a/Steer/src/CollisionContextTool.cxx
+++ b/Steer/src/CollisionContextTool.cxx
@@ -552,8 +552,16 @@ int main(int argc, char* argv[])
   }
   digicontext.setBunchFilling(bunchFillings[0]);
   std::vector<std::string> prefixes;
+  // Signal interaction rate
+  float sgnIRate = -1.;
   for (auto& p : ispecs) {
     prefixes.push_back(p.name);
+    if (p.name == "sgn") {
+      // Setting interaction rate in the digitizer context as provided by the O2DPG workflow
+      LOG(debug) << "Setting signal interaction rate to " << p.interactionRate << " Hz in the digitization context.";
+      sgnIRate = p.interactionRate;
+      digicontext.setDigitizerInteractionRate(p.interactionRate);
+    }
   }
   digicontext.setSimPrefixes(prefixes);