AlpideSignalTrapezoid.cxx

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// Copyright 2019-2020 CERN and copyright holders of ALICE O2.
// See https://alice-o2.web.cern.ch/copyright for details of the copyright holders.
// All rights not expressly granted are reserved.
//
// This software is distributed under the terms of the GNU General Public
// License v3 (GPL Version 3), copied verbatim in the file "COPYING".
//
// In applying this license CERN does not waive the privileges and immunities
// granted to it by virtue of its status as an Intergovernmental Organization
// or submit itself to any jurisdiction.
 
 
/*
 
  This is a simple implementation of the ALPIDE signal time shape
  via trapezoid. Described by the rise time and the flat-top.
  Risetime depends on the injected charge linearly: from mMaxRiseTime for 
  charge=0 to 0. for charge>mChargeRise0.
  Since for the small signals the duration increases, a fraction of the risetime is
  added to the flat-top duration
  The time is in nanoseconds
 
 */
 
#include "ITSMFTSimulation/AlpideSignalTrapezoid.h"
#include <TClass.h>
#include <cassert>
 
using namespace o2::itsmft;
 
//_________________________________________________________________
AlpideSignalTrapezoid::AlpideSignalTrapezoid(float duration, float rise, float qRise0)
{
  init(duration, rise, qRise0);
}
 
//_________________________________________________________________
void AlpideSignalTrapezoid::init(float dur, float rise, float qRise0)
{
  // init with new parameters
  mDuration = dur;
  mMaxRiseTime = rise;
  mChargeRise0 = qRise0;
  assert(mMaxRiseTime > 0.f && qRise0 > 1.f && mDuration > mMaxRiseTime);
  mChargeRise0Inv = 1. / mChargeRise0;
}
 
//_________________________________________________________________
void AlpideSignalTrapezoid::print() const
{
  printf("%s | Duration: %.1f MaxRiseTime: %.1f (RiseTime=0 at q=%.1f) (ns)\n",
         Class()->GetName(), mDuration, mMaxRiseTime, mChargeRise0);
}