Set the alpha of sense wire

Author: myliu

Detector/DetDriftChamber/compact/det.xml

@@ -36,7 +36,7 @@
     <constant name="DC_rend" value="1800*mm"/>
 
     <constant name="DC_layer_number" value="55"/>
-    <constant name="Alpha" value="0*deg"/>
+    <constant name="Alpha" value="12*deg"/>
 
     <constant name="Gas_radius_min" value="DC_rbegin+DC_inner_wall_thickness+DC_safe_distance"/>