Changeset 5318 for trunk/MagicSoft/Simulation/Detector/Camera/camera.cxx

Timestamp:

10/26/04 15:02:32 (20 years ago)

Author:

moralejo

Message:

Added option to switch off gain fluctuations (gain_fluctuations_off)
For calibration file, added writing of fadc_jitter value to the root
output file, in MMcEvt.fTimeFirst, useful for signal extraction tests.

File:

• trunk/MagicSoft/Simulation/Detector/Camera/camera.cxx (modified) (12 diffs)

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

@@ -21 +21 @@
 //
 // $RCSfile: camera.cxx,v $
-// $Revision: 1.78 $
+// $Revision: 1.79 $
 // $Author: moralejo $ 
-// $Date: 2004-10-21 17:44:07 $
+// $Date: 2004-10-26 14:02:32 $
 //
 ////////////////////////////////////////////////////////////////////////
@@ -827 +827 @@
   
   log(SIGNATURE,
-      "%s:\n\t%20s: %s\n\t%20s: %s\n\t%20s: %s\n\t%20s: %s %3.2f, %s %3.2f (%s), %3.2f (%s) + %3.2f (%s) %s\n",
+      "%s:\n\t%20s: %s\n\t%20s: %s\n\t%20s: %s\n\t%20s: %s\n\t\t %s %3.2f,\n\t\t %s %3.2f (%s), %3.2f (%s) \n\t\t + %3.2f (%s)\n\n",
       "Flags",
       "Data_From_STDIN",   ONoff(Data_From_STDIN),  
       "Write_All_Events",  ONoff(Write_All_Images), 
       "Rotate Starfield",  ONoff(Starfield_rotate),
-      "Electronic Noise",  "trigger (rel. noise): ", Trigger_noise, 
-      "FADC (ADC counts): ", FADC_noise_inner, "inner pixels",
-      FADC_noise_outer, "outer pixels", 
-      DIGITAL_noise, "added digital noise at FADC", ONoff(addElecNoise)
+      "Electronic Noise",  ONoff(addElecNoise), 
+      "Trigger noise (amplitude relative to that of single phe): ", 
+      Trigger_noise, 
+      "FADC noise (ADC counts): ", FADC_noise_inner, "inner p.",
+      FADC_noise_outer, "outer p.", 
+      DIGITAL_noise, "added digital noise at FADC"
       );
+
+  if (! apply_gain_fluctuations())
+    log(SIGNATURE, "PMT gain fluctuations have been switched OFF in the input card.\n\n"); 
 
   // log flags information
@@ -931 +936 @@
                     Trigger_response_fwhm, i);  //@< A instance of the Class MTrigger 
     Trigger_CT[i]->SetSeed(UInt_t(i+get_seeds(0)));
+
+    if ( ! apply_gain_fluctuations())
+      Trigger_CT[i]->SetGainFluctuations(kFALSE);
   }
 
@@ -4033 +4041 @@
   // totally equivalent to having made  +- 1 FADC slice
 
-  float fadc_jitter = (1./fadc->GetFadcSlicesPerNanosec()) * random.Uniform(0., 1.);
+  float fadc_jitter = (1./fadc->GetFadcSlicesPerNanosec()) * random.Uniform(0., 1.); //ns
 
   //- - - - - - - - - - - - - - - - - - - - - - - - - 
@@ -4471 +4479 @@
   int *ntotphot = new int[ct_Number];
   float *nphe_from_nsb = new float[ct_Number];
-
-  float timefirst = 0.;
-  float timelast = 0.;
+  float *pulsetime = new float[ct_Number];
   
   float lambda, sigma_lambda, phot_per_pix, sigma_time;
   UInt_t *first_pixel, *last_pixel;
   int selected_pixel;
+
+  TRandom random;
+  random.SetSeed((UInt_t)(get_seeds(0)*get_seeds(0)));
+
+  for (int ict = 0; ict < ct_Number; ict++)
+    pulsetime[ict] = 0.;
 
   // Get parameters of the calibration:
@@ -4534 +4546 @@
       // Produce the photoelectrons
       for(int ict = 0; ict < ct_Number; ict++)
-        produce_calib_phes( (MGeomCam*)(camgeom.UncheckedAt(ict)),
-                            Trigger_CT[ict],
-                            Fadc_CT[ict],
-                            &(ntotphe[ict]),
-                            pheinpix,
-                            &(ntotphot[ict]),
-                            ict,
-                            lambda,
-                            sigma_lambda,
-                            phot_per_pix,
-                            sigma_time,
-                            selected_pixel
-                            );
+        {
+          // Obtain 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. It is
+          // therefore the same time shift for all pixels in a CT. 
+
+          float fadc_jitter = 
+            (1./Fadc_CT[ict]->GetFadcSlicesPerNanosec()) * random.Uniform(0., 1.); //ns
+
+
+          produce_calib_phes( (MGeomCam*)(camgeom.UncheckedAt(ict)),
+                              Trigger_CT[ict],
+                              Fadc_CT[ict],
+                              &(ntotphe[ict]),
+                              pheinpix,
+                              &(ntotphot[ict]),
+                              ict,
+                              lambda,
+                              sigma_lambda,
+                              phot_per_pix,
+                              sigma_time,
+                              selected_pixel,
+                              fadc_jitter
+                              );
+
+          pulsetime[ict] = fadc_jitter; // Keep value for writing it to output.
+        }
 
       // NSB simulation
@@ -4612 +4637 @@
           // 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 
+          // (see that, in produce_calib_phes(...), 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);
+
+          // Add the "digital noise": electronic noise intrinsic to the FADC and which
+          // therefore is not scaled down in the low gain slices!
+
+          Fadc_CT[ict]->DigitalNoise();
 
           //
@@ -4623 +4653 @@
 
           McEvt[ict]->Fill( 0, 0, 0., -1.0, -1.0, -1.0, 0., 0., 0., 0., 0.,
-                            0., 0., 0., timefirst, timelast, 0., 0., 0.,
+                            0., 0., 0., pulsetime[ict], 0., 0., 0., 0.,
                             0., 0., 0., 0., 0, 0, 0,
                             (UInt_t) ntotphot[ict], 
@@ -4677 +4707 @@
                         float     phot_per_pix,  // Average # of photons per inner pixel
                         float     sigma_time,    // Sigma of time spread of photons
-                        int       selected_pixel // if >= 0, only this pixel is used! 
+                        int       selected_pixel,// if >= 0, only this pixel is used! 
+                        float     fadc_jitter    // Random shift (max 1 slice) of pulses in 
+                                                 // FADC, to simulate FADC clock noise.
                         )
 {
@@ -4698 +4730 @@
   TRandom random;
   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.);
 
   //
@@ -4733 +4758 @@
   for (int iph = 0; iph < total_photons; iph++) 
     {
-
-      // time
+      //
+      // Simulate arrival times of photons to camera plane. We do not simulate the small
+      // delays between pixels due to the different distances to the pulser.
+      //
       // We do not want negative times, so center the gaussian at 3 sigma 
       // and reject negative values:
@@ -4883 +4910 @@
 //
 // $Log: not supported by cvs2svn $
+// Revision 1.78  2004/10/21 17:44:07  moralejo
+//
+//  Fixed error recently introduced in MLons::GetResponse. The NSB database
+//  was not correclt ycopied to the FADC when the randomly selected time was
+//  too close to the end of the database. This happened about 2% of times and
+//  produced some repetitive noise peaks in the FADC.
+//  Changed in camera.cxx the arguments of lons.SetSeed y lons_outer.SetSeed
+//
 // Revision 1.77  2004/10/19 10:35:05  moralejo
 // *** empty log message ***