volume scattering length to radiation length

src/modules/Tracking4D/README.md

@@ -19,10 +19,8 @@ Clusters from the first plane in Z (named the seed plane) are related to cluster
 * `timestamp_from`: Defines the detector which provides the track timestamp. This detector also needs to be set as `required_detector`. If empty, the average timestamp of all clusters on the track will be used. Empty by default.
 * `track_model`: Select the track model used for reconstruction. A simple line fit ignoring scattering (`straightline`) and a General-Broken-Lines (`gbl`) are currently supported. Defaults to  `straightline`.
 * `momentum`: Set the beam momentum. Defaults to 5 GeV
-* `volume_scattering`: Select if volume scattering will be taken into account
-- defaults to false
-* `volume_scattering_length`: Define the scattering length of the volume
-around the telescope. Defaults to `304.2 m`
+* `volume_scattering`: Select if volume scattering will be taken into account - defaults to false
+* `volume_radiation_length`: Define the radiation length of the volume around the telescope. Defaults to dry air with a radiation length of`304.2 m`
 
 ### Plots produced
 

src/modules/Tracking4D/Tracking4D.cpp

@@ -34,7 +34,7 @@ Tracking4D::Tracking4D(Configuration config, std::vector<std::shared_ptr<Detecto
     timestampFrom = m_config.get<std::string>("timestamp_from", {});
     trackModel = m_config.get<std::string>("track_model", "straightline");
     momentum = m_config.get<double>("momentum", Units::get<double>(5, "GeV"));
-    volumeScatteringLength = m_config.get<double>("volume_scattering_length", Units::get<double>(304.2, "m"));
+    volumeRadiationLength = m_config.get<double>("volume_radiation_length", Units::get<double>(304.2, "m"));
     useVolumeScatterer = m_config.get<bool>("volume_scattering", false);
 
     // print a warning if volumeScatterer are used as this causes fit failures
@@ -194,7 +194,7 @@ StatusCode Tracking4D::run(std::shared_ptr<Clipboard> clipboard) {
         // Add the cluster to the track
         track->addCluster(cluster);
         track->setTimestamp(cluster->timestamp());
-        track->setVolumeScatter(volumeScatteringLength);
+        track->setVolumeScatter(volumeRadiationLength);
         track->useVolumeScatterer(useVolumeScatterer);
         refTrack->addCluster(cluster);
         refTrack->setTimestamp(cluster->timestamp());

src/modules/Tracking4D/Tracking4D.h

@@ -47,7 +47,7 @@ namespace corryvreckan {
         std::map<std::string, TH1F*> pullY;
         // Cuts for tracking
         double momentum{};
-        double volumeScatteringLength{};
+        double volumeRadiationLength{};
         double time_cut_reference_;
         size_t minHitsOnTrack;
         bool excludeDUT;