diff --git a/source/detector/detector.cc b/source/detector/detector.cc
index 02d967d6..6b3e8454 100644
--- a/source/detector/detector.cc
+++ b/source/detector/detector.cc
@@ -461,9 +461,19 @@ int detector::create_solid(goptions gemcOpt, map<string, detector> *Map)
 		for(int v=0; v<nz; v++)
 			vertices.push_back(G4TwoVector(dimensions[2*v+1], dimensions[2*v+2]));
 		
-		SolidV = new G4GenericTrap(name,    ///< name
+		if (name.size() > 27 && name.compare(19,8, "ahdccell") == 0) {
+			G4Box*  box = new G4Box("Box",80*mm,80*mm,158*mm);
+			G4GenericTrap* ahdc_cell_nocut = new G4GenericTrap(name + "_nocut", ///< name
 							         dz,    ///< Half z length
 					           vertices);   ///< The (x,y) coordinates of vertices
+			SolidV = new G4IntersectionSolid(name, box, ahdc_cell_nocut);
+
+		} else {
+			SolidV = new G4GenericTrap(name,    ///< name
+							         dz,    ///< Half z length
+					           vertices);   ///< The (x,y) coordinates of vertices
+		}
+		
 		built = 1;
 	}
 	
diff --git a/source/hitprocess/clas12/alert/ahdc_hitprocess.cc b/source/hitprocess/clas12/alert/ahdc_hitprocess.cc
index 217143bf..7f4c5a1d 100644
--- a/source/hitprocess/clas12/alert/ahdc_hitprocess.cc
+++ b/source/hitprocess/clas12/alert/ahdc_hitprocess.cc
@@ -244,10 +244,10 @@ void ahdcSignal::ComputeDocaAndTime(MHit * aHit){
 	// ALERT geometry
 	double X_sigwire_top = 0; // [mm]
 	double Y_sigwire_top = 0;
-	double Z_sigwire_top = -150; 
+	double Z_sigwire_top = -188; 
 	double X_sigwire_bot = 0; // [mm]
 	double Y_sigwire_bot = 0;
-	double Z_sigwire_bot = 150;
+	double Z_sigwire_bot = 162.5;
 	
 	// Compute Y_sigwire_top, Z_sigwire_top, Y_sigwire_bot, Z_sigwire_bot
 	double xV0 = 0.0;