[u/mrichter/AliRoot.git] / FMD / AliFMDDigitizer.cxx

/**************************************************************************
 * Copyright(c) 2004, ALICE Experiment at CERN, All rights reserved. *
 *                                                                        *
 * Author: The ALICE Off-line Project.                                    *
 * Contributors are mentioned in the code where appropriate.              *
 *                                                                        *
 * Permission to use, copy, modify and distribute this software and its   *
 * documentation strictly for non-commercial purposes is hereby granted   *
 * without fee, provided that the above copyright notice appears in all   *
 * copies and that both the copyright notice and this permission notice   *
 * appear in the supporting documentation. The authors make no claims     *
 * about the suitability of this software for any purpose. It is          *
 * provided "as is" without express or implied warranty.                  *
 **************************************************************************/
/* $Id$ */
/** @file    AliFMDDigitizer.cxx
    @author  Christian Holm Christensen <cholm@nbi.dk>
    @date    Mon Mar 27 12:38:26 2006
    @brief   FMD Digitizers implementation
    @ingroup FMD_sim
*/
//////////////////////////////////////////////////////////////////////////////
//
//  This class contains the procedures simulation ADC  signal for the
//  Forward Multiplicity detector  : Hits->Digits and Hits->SDigits
// 
//  Digits consists of
//   - Detector #
//   - Ring ID                                             
//   - Sector #     
//   - Strip #
//   - ADC count in this channel                                  
//
//  Digits consists of
//   - Detector #
//   - Ring ID                                             
//   - Sector #     
//   - Strip #
//   - Total energy deposited in the strip
//   - ADC count in this channel                                  
//
// As the Digits and SDigits have so much in common, the classes
// AliFMDDigitizer and AliFMDSDigitizer are implemented via a base
// class AliFMDBaseDigitizer.
//
//                 +---------------------+
//                 | AliFMDBaseDigitizer |
//                 +---------------------+
//                           ^
//                           |
//                +----------+---------+
//                |                    |
//      +-----------------+     +------------------+
//      | AliFMDDigitizer |	| AliFMDSDigitizer |
//      +-----------------+	+------------------+
//
// These classes has several paramters: 
//
//     fPedestal
//     fPedestalWidth
//         (Only AliFMDDigitizer)
//         Mean and width of the pedestal.  The pedestal is simulated
//         by a Guassian, but derived classes my override MakePedestal
//         to simulate it differently (or pick it up from a database).
//
//     fVA1MipRange
//         The dymamic MIP range of the VA1_ALICE pre-amplifier chip 
//
//     fAltroChannelSize
//         The largest number plus one that can be stored in one
//         channel in one time step in the ALTRO ADC chip. 
//
//     fSampleRate
//         How many times the ALTRO ADC chip samples the VA1_ALICE
//         pre-amplifier signal.   The VA1_ALICE chip is read-out at
//         10MHz, while it's possible to drive the ALTRO chip at
//         25MHz.  That means, that the ALTRO chip can have time to
//         sample each VA1_ALICE signal up to 2 times.  Although it's
//         not certain this feature will be used in the production,
//         we'd like have the option, and so it should be reflected in
//         the code.
//
//
// The shaping function of the VA1_ALICE is generally given by 
//
//      f(x) = A(1 - exp(-Bx))
//
// where A is the total charge collected in the pre-amp., and B is a
// paramter that depends on the shaping time of the VA1_ALICE circut.
// 
// When simulating the shaping function of the VA1_ALICe
// pre-amp. chip, we have to take into account, that the shaping
// function depends on the previous value of read from the pre-amp. 
//
// That results in the following algorithm:
//
//    last = 0;
//    FOR charge IN pre-amp. charge train DO 
//      IF last < charge THEN 
//        f(t) = (charge - last) * (1 - exp(-B * t)) + last
//      ELSE
//        f(t) = (last - charge) * exp(-B * t) + charge)
//      ENDIF
//      FOR i IN # samples DO 
//        adc_i = f(i / (# samples))
//      DONE
//      last = charge
//   DONE
//
// Here, 
//
//   pre-amp. charge train 
//       is a series of 128 charges read from the VA1_ALICE chip
//
//   # samples
//       is the number of times the ALTRO ADC samples each of the 128
//       charges from the pre-amp. 
//
// Where Q is the total charge collected by the VA1_ALICE
// pre-amplifier.   Q is then given by 
//
//           E S 
//      Q =  - -
//           e R
//
// where E is the total energy deposited in a silicon strip, R is the
// dynamic range of the VA1_ALICE pre-amp (fVA1MipRange), e is the
// energy deposited by a single MIP, and S ALTRO channel size in each
// time step (fAltroChannelSize).  
//
// The energy deposited per MIP is given by 
//
//      e = M * rho * w 
//
// where M is the universal number 1.664, rho is the density of
// silicon, and w is the depth of the silicon sensor. 
//
// The final ADC count is given by 
//
//      C' = C + P
//
// where P is the (randomized) pedestal (see MakePedestal)
//
// This class uses the class template AliFMDMap<Type> to make an
// internal cache of the energy deposted of the hits.  The class
// template is instantasized as 
//
//  typedef AliFMDMap<std::pair<Float_t, UShort_t> > AliFMDEdepMap;
//
// The first member of the values is the summed energy deposition in a
// given strip, while the second member of the values is the number of
// hits in a given strip.  Using the second member, it's possible to
// do some checks on just how many times a strip got hit, and what
// kind of error we get in our reconstructed hits.  Note, that this
// information is currently not written to the digits tree.  I think a
// QA (Quality Assurance) digit tree is better suited for that task.
// However, the information is there to be used in the future. 
//
//
// Latest changes by Christian Holm Christensen
//
//////////////////////////////////////////////////////////////////////////////

//      /1
//      |           A(-1 + B + exp(-B))
//      | f(x) dx = ------------------- = 1
//      |                    B
//      / 0
//
// and B is the a parameter defined by the shaping time (fShapingTime).  
//
// Solving the above equation, for A gives
//
//                 B
//      A = ----------------
//          -1 + B + exp(-B)
//
// So, if we define the function g: [0,1] -> [0:1] by 
//
//               / v
//               |              Bu + exp(-Bu) - Bv - exp(-Bv) 
//      g(u,v) = | f(x) dx = -A -----------------------------
//               |                            B
//               / u
//
// we can evaluate the ALTRO sample of the VA1_ALICE pre-amp between
// any two times (u, v), by 
//       
//
//                                B	    Bu + exp(-Bu) - Bv - exp(-Bv)
//      C = Q g(u,v) = - Q ---------------- -----------------------------
//		           -1 + B + exp(-B)              B	            
//
//               Bu + exp(-Bu) - Bv - exp(-Bv) 
//        = -  Q -----------------------------
//                    -1 + B + exp(-B)
//

#include <TTree.h>		// ROOT_TTree
//#include <TRandom.h>		// ROOT_TRandom
#include <AliLog.h>		// ALILOG_H
#include "AliFMDDigitizer.h"	// ALIFMDDIGITIZER_H
#include "AliFMD.h"		// ALIFMD_H
// #include "AliFMDGeometry.h"	// ALIFMDGEOMETRY_H
// #include "AliFMDDetector.h"	// ALIFMDDETECTOR_H
// #include "AliFMDRing.h"	        // ALIFMDRING_H
// #include "AliFMDHit.h"		// ALIFMDHIT_H
#include "AliFMDDigit.h"	// ALIFMDDIGIT_H
#include "AliFMDParameters.h"   // ALIFMDPARAMETERS_H
#include <AliRunDigitizer.h>	// ALIRUNDIGITIZER_H
#include <AliRun.h>		// ALIRUN_H
#include <AliLoader.h>		// ALILOADER_H
#include <AliRunLoader.h>	// ALIRUNLOADER_H
    
//====================================================================
ClassImp(AliFMDDigitizer)

//____________________________________________________________________
AliFMDDigitizer::AliFMDDigitizer()  
  : AliFMDBaseDigitizer()
{
  // Default ctor - don't use it
}

//____________________________________________________________________
AliFMDDigitizer::AliFMDDigitizer(AliRunDigitizer* manager) 
  : AliFMDBaseDigitizer(manager)
{
  // Normal CTOR
  AliDebug(1," processed");
}

//____________________________________________________________________
void
AliFMDDigitizer::Exec(Option_t*) 
{
  // Get the output manager 
  TString outFolder(fManager->GetOutputFolderName());
  AliRunLoader* out = 
    AliRunLoader::GetRunLoader(outFolder.Data());
  // Get the FMD output manager 
  AliLoader* outFMD = out->GetLoader("FMDLoader");

  // Get the input loader 
  TString inFolder(fManager->GetInputFolderName(0));
  fRunLoader = 
    AliRunLoader::GetRunLoader(inFolder.Data());
  if (!fRunLoader) {
    AliError("Can not find Run Loader for input stream 0");
    return;
  }
  // Get the AliRun object 
  if (!fRunLoader->GetAliRun()) fRunLoader->LoadgAlice();

  // Get the AliFMD object 
  AliFMD* fmd = 
    static_cast<AliFMD*>(fRunLoader->GetAliRun()->GetDetector("FMD"));
  if (!fmd) {
    AliError("Can not get FMD from gAlice");
    return;
  }

  Int_t nFiles= fManager->GetNinputs();
  for (Int_t inputFile = 0; inputFile < nFiles; inputFile++) {
    AliDebug(1,Form(" Digitizing event number %d",
		    fManager->GetOutputEventNr()));
    // Get the current loader 
    fRunLoader = 
      AliRunLoader::GetRunLoader(fManager->GetInputFolderName(inputFile));
    if (!fRunLoader) Fatal("Exec", "no run loader");
    // Cache contriutions 
    SumContributions(fmd);
  }
  // Digitize the event 
  DigitizeHits(fmd);

  // Load digits from the tree 
  outFMD->LoadDigits("update");
  // Get the tree of digits 
  TTree* digitTree = outFMD->TreeD();
  if (!digitTree) {
    outFMD->MakeTree("D");
    digitTree = outFMD->TreeD();
  }
  digitTree->Reset();
  // Make a branch in the tree 
  TClonesArray* digits = fmd->Digits();
  fmd->MakeBranchInTree(digitTree, fmd->GetName(), &(digits), 4000, 0);
  // TBranch* digitBranch = digitTree->GetBranch(fmd->GetName());
  // Fill the tree 
  Int_t write = 0;
  write = digitTree->Fill();
  AliDebug(1, Form("Wrote %d bytes to digit tree", write));
  
  // Write the digits to disk 
  outFMD->WriteDigits("OVERWRITE");
  outFMD->UnloadHits();
  outFMD->UnloadDigits();

  // Reset the digits in the AliFMD object 
  fmd->ResetDigits();
}


//____________________________________________________________________
UShort_t
AliFMDDigitizer::MakePedestal(UShort_t  detector, 
			      Char_t    ring, 
			      UShort_t  sector, 
			      UShort_t  strip) const 
{
  // Make a pedestal 
  AliFMDParameters* param =AliFMDParameters::Instance();
  Float_t           mean  =param->GetPedestal(detector,ring,sector,strip);
  Float_t           width =param->GetPedestalWidth(detector,ring,sector,strip);
  return UShort_t(TMath::Max(gRandom->Gaus(mean, width), 0.));
}

//____________________________________________________________________
void
AliFMDDigitizer::AddDigit(AliFMD*  fmd,
			  UShort_t detector, 
			  Char_t   ring,
			  UShort_t sector, 
			  UShort_t strip, 
			  Float_t  /* edep */, 
			  UShort_t count1, 
			  Short_t  count2, 
			  Short_t  count3) const
{
  // Add a digit
  fmd->AddDigitByFields(detector, ring, sector, strip, count1, count2, count3);
}

//____________________________________________________________________
void
AliFMDDigitizer::CheckDigit(AliFMDDigit*    digit,
			    UShort_t        nhits,
			    const TArrayI&  counts) 
{
  // Check that digit is consistent
  AliFMDParameters* param = AliFMDParameters::Instance();
  UShort_t          det   = digit->Detector();
  Char_t            ring  = digit->Ring();
  UShort_t          sec   = digit->Sector();
  UShort_t          str   = digit->Strip();
  Float_t           mean  = param->GetPedestal(det,ring,sec,str);
  Float_t           width = param->GetPedestalWidth(det,ring,sec,str);
  UShort_t          range = param->GetVA1MipRange();
  UShort_t          size  = param->GetAltroChannelSize();
  Int_t             integral = counts[0];
  if (counts[1] >= 0) integral += counts[1];
  if (counts[2] >= 0) integral += counts[2];
  integral -= Int_t(mean + 2 * width);
  if (integral < 0) integral = 0;
  
  Float_t convF = Float_t(range) / size;
  Float_t mips  = integral * convF;
  if (mips > Float_t(nhits) + .5 || mips < Float_t(nhits) - .5) 
    Warning("CheckDigit", "Digit -> %4.2f MIPS != %d +/- .5 hits", 
	    mips, nhits);
}

//____________________________________________________________________
//
// EOF
//
Commit	Line	Data
4347b38f	1	/**************************************************************************
4347b38f	2	* Copyright(c) 2004, ALICE Experiment at CERN, All rights reserved. *
66d2ede1	3	* *
	4	* Author: The ALICE Off-line Project. *
	5	* Contributors are mentioned in the code where appropriate. *
	6	* *
	7	* Permission to use, copy, modify and distribute this software and its *
	8	* documentation strictly for non-commercial purposes is hereby granted *
	9	* without fee, provided that the above copyright notice appears in all *
	10	* copies and that both the copyright notice and this permission notice *
	11	* appear in the supporting documentation. The authors make no claims *
	12	* about the suitability of this software for any purpose. It is *
	13	* provided "as is" without express or implied warranty. *
	14	**************************************************************************/
4347b38f	15	/* $Id$ */
c2fc1258	16	/** @file AliFMDDigitizer.cxx
	17	@author Christian Holm Christensen <cholm@nbi.dk>
	18	@date Mon Mar 27 12:38:26 2006
	19	@brief FMD Digitizers implementation
02a27b50	20	@ingroup FMD_sim
c2fc1258	21	*/
4347b38f	22	//////////////////////////////////////////////////////////////////////////////
	23	//
	24	// This class contains the procedures simulation ADC signal for the
	25	// Forward Multiplicity detector : Hits->Digits and Hits->SDigits
	26	//
	27	// Digits consists of
	28	// - Detector #
	29	// - Ring ID
	30	// - Sector #
	31	// - Strip #
	32	// - ADC count in this channel
	33	//
	34	// Digits consists of
	35	// - Detector #
	36	// - Ring ID
	37	// - Sector #
	38	// - Strip #
	39	// - Total energy deposited in the strip
	40	// - ADC count in this channel
	41	//
	42	// As the Digits and SDigits have so much in common, the classes
	43	// AliFMDDigitizer and AliFMDSDigitizer are implemented via a base
	44	// class AliFMDBaseDigitizer.
	45	//
	46	// +---------------------+
	47	// \| AliFMDBaseDigitizer \|
	48	// +---------------------+
	49	// ^
	50	// \|
	51	// +----------+---------+
	52	// \| \|
	53	// +-----------------+ +------------------+
	54	// \| AliFMDDigitizer \| \| AliFMDSDigitizer \|
	55	// +-----------------+ +------------------+
	56	//
	57	// These classes has several paramters:
	58	//
	59	// fPedestal
	60	// fPedestalWidth
	61	// (Only AliFMDDigitizer)
	62	// Mean and width of the pedestal. The pedestal is simulated
	63	// by a Guassian, but derived classes my override MakePedestal
	64	// to simulate it differently (or pick it up from a database).
	65	//
	66	// fVA1MipRange
	67	// The dymamic MIP range of the VA1_ALICE pre-amplifier chip
	68	//
	69	// fAltroChannelSize
	70	// The largest number plus one that can be stored in one
	71	// channel in one time step in the ALTRO ADC chip.
	72	//
	73	// fSampleRate
	74	// How many times the ALTRO ADC chip samples the VA1_ALICE
	75	// pre-amplifier signal. The VA1_ALICE chip is read-out at
	76	// 10MHz, while it's possible to drive the ALTRO chip at
	77	// 25MHz. That means, that the ALTRO chip can have time to
	78	// sample each VA1_ALICE signal up to 2 times. Although it's
	79	// not certain this feature will be used in the production,
	80	// we'd like have the option, and so it should be reflected in
	81	// the code.
	82	//
4347b38f	83	//
e802be3e	84	// The shaping function of the VA1_ALICE is generally given by
4347b38f	85	//
e802be3e	86	// f(x) = A(1 - exp(-Bx))
4347b38f	87	//
e802be3e	88	// where A is the total charge collected in the pre-amp., and B is a
	89	// paramter that depends on the shaping time of the VA1_ALICE circut.
	90	//
	91	// When simulating the shaping function of the VA1_ALICe
	92	// pre-amp. chip, we have to take into account, that the shaping
	93	// function depends on the previous value of read from the pre-amp.
	94	//
	95	// That results in the following algorithm:
	96	//
	97	// last = 0;
	98	// FOR charge IN pre-amp. charge train DO
	99	// IF last < charge THEN
	100	// f(t) = (charge - last) * (1 - exp(-B * t)) + last
	101	// ELSE
	102	// f(t) = (last - charge) * exp(-B * t) + charge)
	103	// ENDIF
	104	// FOR i IN # samples DO
	105	// adc_i = f(i / (# samples))
	106	// DONE
	107	// last = charge
	108	// DONE
	109	//
	110	// Here,
	111	//
	112	// pre-amp. charge train
	113	// is a series of 128 charges read from the VA1_ALICE chip
	114	//
	115	// # samples
	116	// is the number of times the ALTRO ADC samples each of the 128
	117	// charges from the pre-amp.
4347b38f	118	//
	119	// Where Q is the total charge collected by the VA1_ALICE
	120	// pre-amplifier. Q is then given by
	121	//
	122	// E S
	123	// Q = - -
	124	// e R
	125	//
	126	// where E is the total energy deposited in a silicon strip, R is the
	127	// dynamic range of the VA1_ALICE pre-amp (fVA1MipRange), e is the
	128	// energy deposited by a single MIP, and S ALTRO channel size in each
	129	// time step (fAltroChannelSize).
	130	//
	131	// The energy deposited per MIP is given by
	132	//
	133	// e = M * rho * w
	134	//
	135	// where M is the universal number 1.664, rho is the density of
	136	// silicon, and w is the depth of the silicon sensor.
	137	//
	138	// The final ADC count is given by
	139	//
	140	// C' = C + P
	141	//
	142	// where P is the (randomized) pedestal (see MakePedestal)
	143	//
	144	// This class uses the class template AliFMDMap<Type> to make an
	145	// internal cache of the energy deposted of the hits. The class
	146	// template is instantasized as
	147	//
	148	// typedef AliFMDMap<std::pair<Float_t, UShort_t> > AliFMDEdepMap;
	149	//
	150	// The first member of the values is the summed energy deposition in a
	151	// given strip, while the second member of the values is the number of
	152	// hits in a given strip. Using the second member, it's possible to
	153	// do some checks on just how many times a strip got hit, and what
	154	// kind of error we get in our reconstructed hits. Note, that this
	155	// information is currently not written to the digits tree. I think a
	156	// QA (Quality Assurance) digit tree is better suited for that task.
	157	// However, the information is there to be used in the future.
	158	//
	159	//
	160	// Latest changes by Christian Holm Christensen
	161	//
	162	//////////////////////////////////////////////////////////////////////////////
	163
e802be3e	164	// /1
	165	// \| A(-1 + B + exp(-B))
	166	// \| f(x) dx = ------------------- = 1
	167	// \| B
	168	// / 0
	169	//
	170	// and B is the a parameter defined by the shaping time (fShapingTime).
	171	//
	172	// Solving the above equation, for A gives
	173	//
	174	// B
	175	// A = ----------------
	176	// -1 + B + exp(-B)
	177	//
	178	// So, if we define the function g: [0,1] -> [0:1] by
	179	//
	180	// / v
	181	// \| Bu + exp(-Bu) - Bv - exp(-Bv)
	182	// g(u,v) = \| f(x) dx = -A -----------------------------
	183	// \| B
	184	// / u
	185	//
	186	// we can evaluate the ALTRO sample of the VA1_ALICE pre-amp between
	187	// any two times (u, v), by
	188	//
	189	//
	190	// B Bu + exp(-Bu) - Bv - exp(-Bv)
	191	// C = Q g(u,v) = - Q ---------------- -----------------------------
	192	// -1 + B + exp(-B) B
	193	//
	194	// Bu + exp(-Bu) - Bv - exp(-Bv)
	195	// = - Q -----------------------------
	196	// -1 + B + exp(-B)
	197	//
	198
56b1929b	199	#include <TTree.h> // ROOT_TTree
02a27b50	200	//#include <TRandom.h> // ROOT_TRandom
56b1929b	201	#include <AliLog.h> // ALILOG_H
e802be3e	202	#include "AliFMDDigitizer.h" // ALIFMDDIGITIZER_H
e802be3e	203	#include "AliFMD.h" // ALIFMD_H
6169f936	204	// #include "AliFMDGeometry.h" // ALIFMDGEOMETRY_H
	205	// #include "AliFMDDetector.h" // ALIFMDDETECTOR_H
	206	// #include "AliFMDRing.h" // ALIFMDRING_H
	207	// #include "AliFMDHit.h" // ALIFMDHIT_H
e802be3e	208	#include "AliFMDDigit.h" // ALIFMDDIGIT_H
8f6ee336	209	#include "AliFMDParameters.h" // ALIFMDPARAMETERS_H
56b1929b	210	#include <AliRunDigitizer.h> // ALIRUNDIGITIZER_H
	211	#include <AliRun.h> // ALIRUN_H
	212	#include <AliLoader.h> // ALILOADER_H
	213	#include <AliRunLoader.h> // ALIRUNLOADER_H
4347b38f	214
4347b38f	215	//====================================================================
925e6570	216	ClassImp(AliFMDDigitizer)
66d2ede1	217
4347b38f	218	//____________________________________________________________________
	219	AliFMDDigitizer::AliFMDDigitizer()
	220	: AliFMDBaseDigitizer()
	221	{
	222	// Default ctor - don't use it
	223	}
66d2ede1	224
4347b38f	225	//____________________________________________________________________
	226	AliFMDDigitizer::AliFMDDigitizer(AliRunDigitizer* manager)
	227	: AliFMDBaseDigitizer(manager)
	228	{
	229	// Normal CTOR
	230	AliDebug(1," processed");
4347b38f	231	}
66d2ede1	232
4347b38f	233	//____________________________________________________________________
	234	void
	235	AliFMDDigitizer::Exec(Option_t*)
	236	{
	237	// Get the output manager
	238	TString outFolder(fManager->GetOutputFolderName());
	239	AliRunLoader* out =
	240	AliRunLoader::GetRunLoader(outFolder.Data());
	241	// Get the FMD output manager
	242	AliLoader* outFMD = out->GetLoader("FMDLoader");
	243
	244	// Get the input loader
	245	TString inFolder(fManager->GetInputFolderName(0));
	246	fRunLoader =
a3537838	247	AliRunLoader::GetRunLoader(inFolder.Data());
4347b38f	248	if (!fRunLoader) {
	249	AliError("Can not find Run Loader for input stream 0");
	250	return;
	251	}
	252	// Get the AliRun object
	253	if (!fRunLoader->GetAliRun()) fRunLoader->LoadgAlice();
	254
	255	// Get the AliFMD object
8f6ee336	256	AliFMD* fmd =
8f6ee336	257	static_cast<AliFMD*>(fRunLoader->GetAliRun()->GetDetector("FMD"));
4347b38f	258	if (!fmd) {
	259	AliError("Can not get FMD from gAlice");
	260	return;
	261	}
	262
	263	Int_t nFiles= fManager->GetNinputs();
	264	for (Int_t inputFile = 0; inputFile < nFiles; inputFile++) {
	265	AliDebug(1,Form(" Digitizing event number %d",
	266	fManager->GetOutputEventNr()));
	267	// Get the current loader
	268	fRunLoader =
	269	AliRunLoader::GetRunLoader(fManager->GetInputFolderName(inputFile));
	270	if (!fRunLoader) Fatal("Exec", "no run loader");
	271	// Cache contriutions
	272	SumContributions(fmd);
	273	}
	274	// Digitize the event
	275	DigitizeHits(fmd);
	276
	277	// Load digits from the tree
	278	outFMD->LoadDigits("update");
	279	// Get the tree of digits
	280	TTree* digitTree = outFMD->TreeD();
	281	if (!digitTree) {
	282	outFMD->MakeTree("D");
	283	digitTree = outFMD->TreeD();
	284	}
	285	digitTree->Reset();
	286	// Make a branch in the tree
	287	TClonesArray* digits = fmd->Digits();
	288	fmd->MakeBranchInTree(digitTree, fmd->GetName(), &(digits), 4000, 0);
	289	// TBranch* digitBranch = digitTree->GetBranch(fmd->GetName());
	290	// Fill the tree
a1f80595	291	Int_t write = 0;
	292	write = digitTree->Fill();
	293	AliDebug(1, Form("Wrote %d bytes to digit tree", write));
66d2ede1	294
4347b38f	295	// Write the digits to disk
	296	outFMD->WriteDigits("OVERWRITE");
	297	outFMD->UnloadHits();
	298	outFMD->UnloadDigits();
4110645f	299
4347b38f	300	// Reset the digits in the AliFMD object
	301	fmd->ResetDigits();
	302	}
3d44ce66	303
88cb7938	304
4347b38f	305	//____________________________________________________________________
4347b38f	306	UShort_t
8f6ee336	307	AliFMDDigitizer::MakePedestal(UShort_t detector,
	308	Char_t ring,
	309	UShort_t sector,
	310	UShort_t strip) const
4347b38f	311	{
088f8e79	312	// Make a pedestal
8f6ee336	313	AliFMDParameters* param =AliFMDParameters::Instance();
	314	Float_t mean =param->GetPedestal(detector,ring,sector,strip);
	315	Float_t width =param->GetPedestalWidth(detector,ring,sector,strip);
	316	return UShort_t(TMath::Max(gRandom->Gaus(mean, width), 0.));
4347b38f	317	}
88cb7938	318
4347b38f	319	//____________________________________________________________________
	320	void
	321	AliFMDDigitizer::AddDigit(AliFMD* fmd,
	322	UShort_t detector,
	323	Char_t ring,
	324	UShort_t sector,
	325	UShort_t strip,
	326	Float_t /* edep */,
	327	UShort_t count1,
	328	Short_t count2,
	329	Short_t count3) const
	330	{
088f8e79	331	// Add a digit
69b696b9	332	fmd->AddDigitByFields(detector, ring, sector, strip, count1, count2, count3);
4347b38f	333	}
3d44ce66	334
4347b38f	335	//____________________________________________________________________
4347b38f	336	void
8f6ee336	337	AliFMDDigitizer::CheckDigit(AliFMDDigit* digit,
4347b38f	338	UShort_t nhits,
	339	const TArrayI& counts)
	340	{
088f8e79	341	// Check that digit is consistent
8f6ee336	342	AliFMDParameters* param = AliFMDParameters::Instance();
	343	UShort_t det = digit->Detector();
	344	Char_t ring = digit->Ring();
	345	UShort_t sec = digit->Sector();
	346	UShort_t str = digit->Strip();
	347	Float_t mean = param->GetPedestal(det,ring,sec,str);
	348	Float_t width = param->GetPedestalWidth(det,ring,sec,str);
	349	UShort_t range = param->GetVA1MipRange();
	350	UShort_t size = param->GetAltroChannelSize();
	351	Int_t integral = counts[0];
4347b38f	352	if (counts[1] >= 0) integral += counts[1];
4347b38f	353	if (counts[2] >= 0) integral += counts[2];
8f6ee336	354	integral -= Int_t(mean + 2 * width);
4347b38f	355	if (integral < 0) integral = 0;
4347b38f	356
8f6ee336	357	Float_t convF = Float_t(range) / size;
088f8e79	358	Float_t mips = integral * convF;
4347b38f	359	if (mips > Float_t(nhits) + .5 \|\| mips < Float_t(nhits) - .5)
	360	Warning("CheckDigit", "Digit -> %4.2f MIPS != %d +/- .5 hits",
	361	mips, nhits);
	362	}
66d2ede1	363
4347b38f	364	//____________________________________________________________________
	365	//
	366	// EOF
	367	//
88cb7938	368
	369
	370
66d2ede1	371