diff --git a/beam.mac b/beam.mac
index 638b8d57d450ec96da73d82837730f8b4fb317e9..dfe1ba063c3ee774013af747299311d3a754bf60 100644
--- a/beam.mac
+++ b/beam.mac
@@ -9,17 +9,17 @@
 
 #----- Set the beam geometry -----
 # Circular beam source. Simulates a single fiber optic
-/gps/pos/type Beam
-/gps/pos/shape Circle
+#/gps/pos/type Beam
+#/gps/pos/shape Circle
 #/gps/pos/radius 0.75 mm
-/gps/pos/radius 102 mm
+#/gps/pos/radius 102 mm
 #/gps/pos/sigma_r 0.002 mm
 
 # Rectangular plane for infinite resolution
-#/gps/pos/type Plane
-#/gps/pos/shape Rectangle
-#/gps/pos/halfx 40 mm
-#/gps/pos/halfy 68 mm
+/gps/pos/type Plane
+/gps/pos/shape Rectangle
+/gps/pos/halfx 40 mm
+/gps/pos/halfy 68 mm
 
 # the incident surface is in the x-z plane just below the gas
 /gps/pos/rot1 1 0 0
diff --git a/geometry.mac b/geometry.mac
index 64a63da37d0d34a34ba680ee021f86c08c51d6a7..8a6b9ceee828f2af110b9edd535aa8f49991f684 100644
--- a/geometry.mac
+++ b/geometry.mac
@@ -2,8 +2,9 @@
 /lightGuide/worldVolume 0.25 0.25 0.25 m
 /lightGuide/envelope 89.75 113. 165. mm
 
-#/lightGuide/model/nSegmentsX 1
-#/lightGuide/model/nSegmentsZ 1
+/lightGuide/model/PMTDiameter 53 mm
+/lightGuide/model/nSegmentsX 2
+/lightGuide/model/nSegmentsZ 2
 
 
 
@@ -53,9 +54,9 @@
 
 
 #----- Set surface properties of the light guide -----
-/lightGuide/surface/Model unified
-/lightGuide/surface/Type dielectric_metal
-/lightGuide/surface/Finish ground
+#/lightGuide/surface/Model unified
+#/lightGuide/surface/Type dielectric_metal
+#/lightGuide/surface/Finish ground
 #/lightGuide/surface/SigmaAlpha .1
 #/lightGuide/surface/Property SPECULARLOBECONSTANT 0.000002 .4 0.000008 .4
 #/lightGuide/surface/Property SPECULARSPIKECONSTANT 0.000002 .1 0.000008 .1
diff --git a/run1.mac b/run1.mac
index 0df87e19d7662dd11018e38d24ebd2a5c4ea6efb..9e22f98604ac7313064f6b2a501624b25ae90821 100644
--- a/run1.mac
+++ b/run1.mac
@@ -23,14 +23,14 @@
 ##############################################################
 #Uncomment to generate events from ASCII file, set the file path here.
 #make sure /run/beamOn is commented out below
-/Input/FileName Out_target1.txt
+#/Input/FileName Out_target1.txt
 
 
 #Uncomment to use gps style of setting the beam profile
-#/control/execute beam.mac
+/control/execute beam.mac
 #set number of photons per event
-#/gps/number 10
+/gps/number 100
 # number of events
-#/run/beamOn 1
+/run/beamOn 1
 ##############################################################
 ##############################################################