Changeset 5275 for trunk/MagicSoft/Simulation/Detector/Camera/camera.cxx

Timestamp:

10/14/04 17:56:43 (20 years ago)

Author:

moralejo

Message:

- Added calibration_run option to produce calibration MC files.

- Added jitter of pulse position +- 0.5 slices due to FADC clock noise.

File:

• trunk/MagicSoft/Simulation/Detector/Camera/camera.cxx (modified) (9 diffs)

trunk/MagicSoft/Simulation/Detector/Camera/camera.cxx

@@ -21 +21 @@
 //
 // $RCSfile: camera.cxx,v $
-// $Revision: 1.75 $
+// $Revision: 1.76 $
 // $Author: moralejo $ 
-// $Date: 2004-10-14 12:55:02 $
+// $Date: 2004-10-14 16:56:43 $
 //
 ////////////////////////////////////////////////////////////////////////
@@ -4025 +4025 @@
   float C1, C2, C3, rho;
 
+  // A. Moralejo, October 2004
+  // Introduced the FADC jitter of 1 FADC slice. This is a time to be added to the 
+  // time of all photons in an event, before digitalization of the signal. We use 
+  // a positive value between 0 and 1 slice for technical reasons, but it is 
+  // totally equivalent to having made  +- 1 FADC slice
+
+  float fadc_jitter = (1./fadc->GetFadcSlicesPerNanosec()) * random.Uniform(0., 1.);
 
   //- - - - - - - - - - - - - - - - - - - - - - - - - 
@@ -4195 +4202 @@
     // store the new photoelectron
 
-    fadc->Fill(ipixnum,(t-*tmin_ns) , 
-               trigger->FillShow(ipixnum,t-*tmin_ns),
+    fadc->Fill(ipixnum,(t-*tmin_ns) + fadc_jitter , 
+               trigger->FillShow(ipixnum, t-*tmin_ns + fadc_jitter),
                !((*camgeom)[ipixnum].GetD()>(*camgeom)[0].GetD()));
     
@@ -4597 +4604 @@
           Fadc_CT[ict]->Pedestals();
 
-          // Set the trigger time. The 3 ns are such that the pulse appears well 
-          // centered if the FADC range is the usual 50 ns.
-          // If you want to shift the pulse position, do not change the value here,
+          // Set the trigger time. The 3 ns are such that the calibration pulses
+          // appear roughly at the same position as for the case of real data.
+          // If you want to shift the pulse position, do not change this value here,
           // use the option trigger_delay in the input card instead.
-
-          Fadc_CT[ict]->TriggeredFadc(13.);
+          // The additional value 3*sigma_time makes that the pulse maximum is, in 
+          // average, in the same position no matter of the time width of the pulse
+          // (see in produce_calib_phes(...) that in order to avoid negative times 
+          // we shift the time of the photons by this same amount!)
+
+          Fadc_CT[ict]->TriggeredFadc(3.+3*sigma_time);
 
           //
@@ -4686 +4697 @@
   random.SetSeed(seed);
 
+  // Introduce the FADC jitter of 1 FADC slice. This is a time to be added to the 
+  // time of all photons in an event, before digitalization of the signal. We use 
+  // a positive value between 0 and 1 slice for technical reasons, but it is 
+  // totally equivalent to having made  +- 1 FADC slice
+
+  float fadc_jitter = (1./fadc->GetFadcSlicesPerNanosec()) * random.Uniform(0., 1.);
+
   //
   // Create photons and "map" them into the pixels
@@ -4715 +4733 @@
 
       // time
-      //      time = random.Gaus(0., sigma_time);
-      time = 10.;
+      // We do not want negative times, so center the gaussian at 3 sigma 
+      // and reject negative values:
+
+      do
+        time = random.Gaus(3*sigma_time, sigma_time);
+      while (time < 0.);
 
       // wavelength
-      wl = lambda;
+      wl = random.Gaus(lambda, sigma_lambda);
 
       if( (wl > WAVEBANDBOUND6) || (wl < WAVEBANDBOUND1))
@@ -4792 +4814 @@
 
       //
-      // Apply incient angular correction due to Light Guides, plexiglas,
+      // Apply incident angular correction due to Light Guides, plexiglas,
       // 1st dynode collection efficiency, double crossings... etc. 
       // This information is contained in the file Data/LightCollection.dat,
@@ -4837 +4859 @@
       // store the new photoelectron
 
-      fadc->Fill(ipixnum,(time) , 
-                 trigger->FillShow(ipixnum, time),
+      fadc->Fill(ipixnum, time + fadc_jitter, 
+                 trigger->FillShow(ipixnum, time + fadc_jitter),
                  !((*camgeom)[ipixnum].GetD()>(*camgeom)[0].GetD()));
     
@@ -4860 +4882 @@
 //
 // $Log: not supported by cvs2svn $
+// Revision 1.75  2004/10/14 12:55:02  moralejo
+// *** empty log message ***
+//
 // Revision 1.74  2004/10/13 17:05:05  moralejo
 // *** empty log message ***