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This method is good for any waveform data from the Acqiris digitizers, just replace the source name (here AmoITof for the AMO Ion Time of flight detector) with some other Acqiris waveform detector.

Include and global variable definitions:

Code Block

#include <TProfile.h>

static int        numChannelsITof;
static int        numSamplesITof;
static double     sampleIntervalITof;
static TProfile*  profileITof = NULL;

In beginjob(), read configuration data and book a profile histogram (for each sample interval (x-axis), draw the average number of samples (y-axis), i.e. the average waveform of all events).

Code Block

  int fail = getAcqConfig( AmoITof, numChannelsITof, numSamplesITof, sampleIntervalITof);
  if ( fail != 0 )
    printf( "begin(): getAcqConfig() failed, code = %d\n", fail );

  profileITof = new TProfile("avg","avg",numSamplesITof,0.0,sampleIntervalITof,"");
  profileITof->SetYTitle("Volts");    //optional
  profileITof->SetXTitle("Seconds");  //optional

In the event() function, get the Acqiris value for this event and add it to the histogram. The getAcqValue function will point timeITof and voltageITof to arrays of readout values.

Code Block

  double* timeITof;    // array: sample interval 
  double* voltageITof; // array: readout values
  int channel = 0;
  int fail = getAcqValue( AmoITof, channel, timeITof, voltageITof);
  if ( fail != 0 )
  {
    printf( "event(): getAcqValue() failed, code = %d\n", fail );
  }
  else
  {
    for (i=0;i<numSamplesITof;i=i+1)
      {
        double t = timeITof[i];
        double v = voltageITof[i];
        profileITof->Fill(t,v);
      }
  }

Beamline data (Bld)

To read out energy, charge and position of the beam from the beamline data, use getEBeam(). The function returns 0 if data is available and assignes values to its arguments from the current event. Call from within event().

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