changed layer_7 id to layer_20 to test overlap, corrected

src/cb_CTD_Si.cpp

@@ -50,6 +50,7 @@ static Ref_t createDetector(Detector& desc, xml_h e, SensitiveDetector sens)
       continue; 
     
     string logic_layer_name = detName + _toString(i, "_Logic_lay_%d");
+    if (i==7){logic_layer_name = detName + _toString(20, "_Logic_lay_%d");}
     Volume layerVol(logic_layer_name,Tube(layerRIn[i], layerROut[i], SizeZ / 2.0, 0.0, 360.0 * deg), slice_mat);
     layerVol.setVisAttributes(desc,x_layer.visStr());
     sens.setType("tracker");
@@ -57,9 +58,7 @@ static Ref_t createDetector(Detector& desc, xml_h e, SensitiveDetector sens)
 
     Position     layer_pos = Position(0.0, 0.0, 0.0);
     PlacedVolume layerPV = detVol.placeVolume(layerVol, layer_pos);
-    if (i == 6){i = 20;}
     layerPV.addPhysVolID("layer", i+1);
-    if (i == 20){i = 6;}
   }
 
   DetElement   det(detName, detID);