Resolve "Update ZDC Material and Cracks"

ip6/far_forward_ZDC_Hcal.xml

@@ -12,9 +12,9 @@
       <rotation x="ffi_ZDC_HCAL_rotateX_angle" y="ffi_ZDC_HCAL_rotateY_angle" z="ffi_ZDC_HCAL_rotateZ_angle"/>
       <dimensions x="ffi_ZDC_HCAL_width" z="ffi_ZDC_HCAL_length"/>
       <layer repeat="ffi_ZDC_PbScint_NRepeat">
-        <slice name="Lead_slice"  material="Pb"               thickness="ffi_ZDC_Lead_Thickness"  vis="AnlGray"/>
-        <slice name="Scint_slice" material="ZDC_Scintillator" thickness="ffi_ZDC_Scint_Thickness" vis="AnlOrange" sensitive="true"/>
-	<slice name="Air_4_slice" material="Air"              thickness="ffi_ZDC_Air_4_Thickness" vis="InvisibleNoDaughters"/>
+        <slice name="Lead_slice"  material="Pb"           thickness="ffi_ZDC_Lead_Thickness"  vis="AnlGray"/>
+        <slice name="Scint_slice" material="PlasticScint" thickness="ffi_ZDC_Scint_Thickness" vis="AnlOrange" sensitive="true"/>
+	<slice name="Air_4_slice" material="Air"          thickness="ffi_ZDC_Air_4_Thickness" vis="InvisibleNoDaughters"/>
       </layer>
     </detector>
   </detectors>

src/ZeroDegreeCalorimeterEcalWSciFi_geo.cpp

@@ -94,7 +94,7 @@ static Ref_t create_detector(Detector& desc, xml::Handle_t handle, SensitiveDete
   double mod_x_pos = 0.0;
   double mod_y_pos = 0.0;
   double mod_z_pos = 0.0 * mm;
-  double mgap = sx/100.; // 0.000001 * mm;
+  double mgap = 0.000001 * mm;
   int mNTowers = floor(width / (sx+mgap));
   //std::cout << "mNTowers: " << mNTowers << std::endl;