diff --git a/script/Alignment/Laser_gun_alignment.py b/script/Alignment/Laser_gun_alignment.py
index 38bd7ee..1e55a70 100755
--- a/script/Alignment/Laser_gun_alignment.py
+++ b/script/Alignment/Laser_gun_alignment.py
@@ -6,16 +6,8 @@
     # switch off all the magnets between the gun solenoid and the screen or BPM used for the measurement
     # change the phase of the gun RF
     # look at the centroid position (BPM or screen) downstream of the gun.
-
-if get_context().source == CommandSource.ui:
-    phi1 = 20.0
-    phi2 = 30.0
-    dphi = 1.0
-    settling_time = 0.1
-
-import org.apache.commons.math3.linear.Array2DRowRealMatrix as Matrix
-import ch.psi.utils.Convert.toBidimensional as mono_to_bidi
 import datetime
+from camtool import CamTool
 
 if get_context().source == CommandSource.ui:
     phi1 = 95.0
@@ -53,15 +45,23 @@ if zero_solenoids:
 
 # add here gun phase setting see wiki page
 
-def br():
-    pass
+def br():    
+    if multiple_background:
+        camtool.captureBackground(number_backgrounds)
+        laser_on()            
+    camtool.update()
+    
 def ar():
-    pass   
+    if multiple_background:
+        laser_off()
      
 r = None
-laser_on()
+if not multiple_background:
+    laser_on()
 try:
-    sensors =  [cam_x, cam_y, cam_img] if plot_image else  [cam_x, cam_y]
+    sensors =  [camtool.com_x_mean, camtool.com_y_mean, camtool.com_x_var, camtool.com_y_var] 
+    if plot_image:
+        sensors.append(camtool.image)
     r = lscan(gun_solenoid, sensors , I1, I2, dI, settling_time, before_read = br, after_read = ar)
 finally:
     laser_off()
@@ -72,6 +72,7 @@ if centroid_excursion_plot:
 else:   
     (hx,hy)= convex_hull(x=r.getReadable(0), y=r.getReadable(1))
     hx.append(hx[0]); hy.append(hy[0])        
+    
 
 # save the entry in the logbook
 if do_elog: