diff --git a/detectorSegmentations/include/detectorSegmentations/FCCSWEndcapTurbine_k4geo.h b/detectorSegmentations/include/detectorSegmentations/FCCSWEndcapTurbine_k4geo.h
index 9a68a6e0f..ff50eb3c1 100644
--- a/detectorSegmentations/include/detectorSegmentations/FCCSWEndcapTurbine_k4geo.h
+++ b/detectorSegmentations/include/detectorSegmentations/FCCSWEndcapTurbine_k4geo.h
@@ -172,7 +172,7 @@ namespace DDSegmentation {
     /** return the number of unit cells in each wheel
      * @param[in] iWheel wheel identifier
      */
-    inline int nModules(int iWheel) { return m_nUnitCells[iWheel] / m_mergedModules[iWheel]; }
+    inline int nModules(int iWheel) const { return m_nUnitCells[iWheel] / m_mergedModules[iWheel]; }
     /** return the expected value of the layer index
      * @param[in] iWheel wheel identifier
      * @param[in] iRho rho readout cell identifier
@@ -180,6 +180,23 @@ namespace DDSegmentation {
      */
     unsigned expLayer(unsigned iWheel, unsigned iRho, unsigned iZ) const;
 
+    /**  Get the field name for side.
+     *   return The field name for side.
+     */
+    inline const std::string& fieldNameSide() const { return m_sideID; }
+    /**  Get the field name for the wheel.
+     *   return The field name for wheel.
+     */
+    inline const std::string& fieldNameWheel() const { return m_wheelID; }
+    /**  Get the field name for the module.
+     *   return The field name for module.
+     */
+    inline const std::string& fieldNameModule() const { return m_moduleID; }
+    /**  Get the field name for the layer.
+     *   return The field name for layer.
+     */
+    inline const std::string& fieldNameLayer() const { return m_layerID; }
+
   private:
     /// turbine blade angle in each wheel
     std::vector<double> m_bladeAngle;