[u/mrichter/AliRoot.git] / TRD / AliTRDltuParam.cxx

#include <stdio.h>

#include "TMath.h"

#include "AliTRDltuParam.h"

// definition of geometry constants
Float_t AliTRDltuParam::fgZrow[6][5] = {
  {301, 177, 53, -57, -181},
  {301, 177, 53, -57, -181},
  {315, 184, 53, -57, -188},
  {329, 191, 53, -57, -195},
  {343, 198, 53, -57, -202},
  {347, 200, 53, -57, -204}};
Float_t AliTRDltuParam::fgX[6] =
  {300.65, 313.25, 325.85, 338.45, 351.05, 363.65};
Float_t AliTRDltuParam::fgTiltingAngle[6] =
  {-2., 2., -2., 2., -2., 2.};
Int_t   AliTRDltuParam::fgDyMax =  63;
Int_t   AliTRDltuParam::fgDyMin = -64;
Float_t AliTRDltuParam::fgBinDy = 140e-6;
Float_t AliTRDltuParam::fgWidthPad[6] =
  {0.635, 0.665, 0.695, 0.725, 0.755, 0.785};
Float_t AliTRDltuParam::fgLengthInnerPadC1[6] =
  {7.5, 7.5, 8.0, 8.5, 9.0, 9.0};
Float_t AliTRDltuParam::fgLengthOuterPadC1[6] =
  {7.5, 7.5, 7.5, 7.5, 7.5, 8.5};
Float_t AliTRDltuParam::fgLengthInnerPadC0 = 9.0;
Float_t AliTRDltuParam::fgLengthOuterPadC0 = 8.0;
Float_t AliTRDltuParam::fgScalePad = 256. * 32.;
Float_t AliTRDltuParam::fgDriftLength = 3.;

AliTRDltuParam::AliTRDltuParam() :
  TObject(),
  fMagField(0.),
  fOmegaTau(0.),
  fPtMin(0.1),
  fNtimebins(20 << 5),
  fScaleQ0(0),
  fScaleQ1(0),
  fPidTracklengthCorr(kFALSE),
  fTiltCorr(kFALSE),
  fPidGainCorr(kFALSE)
{
  // default constructor
}

AliTRDltuParam::~AliTRDltuParam()
{
  // destructor
}

Int_t AliTRDltuParam::GetDyCorrection(Int_t det, Int_t rob, Int_t mcm) const
{
  // calculate the correction of the deflection
  // i.e. Lorentz angle and tilt correction (if active)

  Int_t layer = det % 6;

  Float_t dyTilt = ( fgDriftLength * TMath::Tan(fgTiltingAngle[layer] * TMath::Pi()/180.) *
  		     GetLocalZ(det, rob, mcm) / fgX[layer] );

  // calculate Lorentz correction
  Float_t dyCorr = - fOmegaTau * fgDriftLength;

  if(fTiltCorr)
    dyCorr += dyTilt; // add tilt correction

  return (int) TMath::Nint(dyCorr * fgScalePad / fgWidthPad[layer]);
}

void AliTRDltuParam::GetDyRange(Int_t det, Int_t rob, Int_t mcm, Int_t ch,
				 Int_t &dyMinInt, Int_t &dyMaxInt) const
{
  // calculate the deflection range in which tracklets are accepted

  dyMinInt = fgDyMin;
  dyMaxInt = fgDyMax;

  if (TMath::Abs(fMagField) < 0.1)
    return;

  Float_t e = 0.30;

  Float_t maxDeflTemp = GetPerp(det, rob, mcm, ch)/2. *         // Sekante/2
    (e * TMath::Abs(fMagField) / fPtMin);   // 1/R

  Float_t maxDeflAngle = 0.;

  if (maxDeflTemp < 1.) {
    maxDeflAngle = TMath::ASin(maxDeflTemp);

    Float_t dyMin = ( fgDriftLength *
		      tan(GetPhi(det, rob, mcm, ch) - maxDeflAngle) );

    dyMinInt = Int_t(dyMin / fgBinDy);
    if (dyMinInt < fgDyMin)
      dyMinInt = fgDyMin;

    Float_t dyMax = ( fgDriftLength *
  		      TMath::Tan(GetPhi(det, rob, mcm, ch) + maxDeflAngle) );

    dyMaxInt = Int_t(dyMax / fgBinDy);
    if (dyMaxInt > fgDyMax)
      dyMaxInt = fgDyMax;
  }
  if ((dyMaxInt - dyMinInt) <= 0) {
    printf("strange dy range: [%i,%i]\n", dyMinInt, dyMaxInt);
  }
}

Float_t AliTRDltuParam::GetElongation(Int_t det, Int_t rob, Int_t mcm, Int_t ch) const
{
  // calculate the ratio of the distance to the primary vertex and the
  // distance in x-direction for the given ADC channel

  Int_t layer = det % 6;

  Float_t elongation = TMath::Abs(GetDist(det, rob, mcm, ch) / fgX[layer]);

  // sanity check
  if(elongation<0.001) {
    elongation=1.;
  }
  return elongation;
}

void AliTRDltuParam::GetCorrectionFactors(Int_t det, Int_t rob, Int_t mcm, Int_t ch,
					  UInt_t &cor0, UInt_t &cor1, Float_t gain) const
{
  // calculate the gain correction factors for the given ADC channel

  if (fPidGainCorr==kFALSE)
    gain=1;

  if (fPidTracklengthCorr == kTRUE ) {
    cor0 = UInt_t ((1.0*fScaleQ0* (1./GetElongation(det, rob, mcm, ch))) / gain );
    cor1 = UInt_t ((1.0*fScaleQ1* (1./GetElongation(det, rob, mcm, ch))) / gain );
  }
  else {
    cor0 = UInt_t (fScaleQ0 / gain);
    cor1 = UInt_t ( fScaleQ1 / gain);
  }
}

Int_t AliTRDltuParam::GetNtimebins() const
{
  // return the number of timebins used

  return fNtimebins;
}

Float_t AliTRDltuParam::GetX(Int_t det, Int_t /* rob */, Int_t /* mcm */) const
{
  // return the distance to the beam axis in x-direction

  Int_t layer = det%6;
  return fgX[layer];
}

Float_t AliTRDltuParam::GetLocalY(Int_t det, Int_t rob, Int_t mcm, Int_t ch) const
{
  // get local y-position (r-phi) w.r.t. the chamber centre

  Int_t layer = det%6;
  // calculate the pad position as in the TRAP
  Float_t ypos = (-4 + 1 + (rob&0x1) * 4 + (mcm&0x3)) * 18 - ch - 0.5; // y position in bins of pad widths
  return ypos*fgWidthPad[layer];
}

Float_t AliTRDltuParam::GetLocalZ(Int_t det, Int_t rob, Int_t mcm) const
{
  // get local z-position w.r.t. to the chamber boundary

  Int_t stack = (det%30) / 6;
  Int_t layer = det % 6;
  Int_t row   = (rob/2) * 4 + mcm/4;

  if (stack == 2) {
    if (row == 0)
      return (fgZrow[layer][stack] - 0.5 * fgLengthOuterPadC0);
    else if (row == 11)
      return (fgZrow[layer][stack] - 1.5 * fgLengthOuterPadC0 - (row - 1) * fgLengthInnerPadC0);
    else
      return (fgZrow[layer][stack] - fgLengthOuterPadC0 - (row - 0.5) * fgLengthInnerPadC0);
  }
  else {
    if (row == 0)
      return (fgZrow[layer][stack] - 0.5 * fgLengthOuterPadC1[layer]);
    else if (row == 15)
      return (fgZrow[layer][stack] - 1.5 * fgLengthOuterPadC1[layer] - (row - 1) * fgLengthInnerPadC1[layer]);
    else
      return (fgZrow[layer][stack] - fgLengthOuterPadC1[layer] - (row - 0.5) * fgLengthInnerPadC1[layer]);
  }
}

Float_t AliTRDltuParam::GetPerp(Int_t det, Int_t rob, Int_t mcm, Int_t ch) const
{
  // get transverse distance to the beam axis

  return TMath::Sqrt(GetLocalY(det, rob, mcm, ch)*GetLocalY(det, rob, mcm, ch) +
		     GetX(det, rob, mcm)*GetX(det, rob, mcm) );
}

Float_t AliTRDltuParam::GetPhi(Int_t det, Int_t rob, Int_t mcm, Int_t ch) const
{
  // calculate the azimuthal angle for the given ADC channel

  return TMath::ATan2(GetLocalY(det, rob, mcm, ch), GetX(det, rob, mcm));
}

Float_t AliTRDltuParam::GetDist(Int_t det, Int_t rob, Int_t mcm, Int_t ch) const
{
  // calculate the distance from the origin for the given ADC channel

  return TMath::Sqrt(GetLocalY(det, rob, mcm, ch)*GetLocalY(det, rob, mcm, ch) +
		     GetX(det, rob, mcm)*GetX(det, rob, mcm) +
		     GetLocalZ(det, rob, mcm)*GetLocalZ(det, rob, mcm) );
}
Commit	Line	Data
5e86ff99	1	#include <stdio.h>
	2
	3	#include "TMath.h"
	4
	5	#include "AliTRDltuParam.h"
	6
	7	// definition of geometry constants
	8	Float_t AliTRDltuParam::fgZrow[6][5] = {
	9	{301, 177, 53, -57, -181},
	10	{301, 177, 53, -57, -181},
	11	{315, 184, 53, -57, -188},
	12	{329, 191, 53, -57, -195},
	13	{343, 198, 53, -57, -202},
	14	{347, 200, 53, -57, -204}};
	15	Float_t AliTRDltuParam::fgX[6] =
	16	{300.65, 313.25, 325.85, 338.45, 351.05, 363.65};
	17	Float_t AliTRDltuParam::fgTiltingAngle[6] =
	18	{-2., 2., -2., 2., -2., 2.};
	19	Int_t AliTRDltuParam::fgDyMax = 63;
	20	Int_t AliTRDltuParam::fgDyMin = -64;
	21	Float_t AliTRDltuParam::fgBinDy = 140e-6;
	22	Float_t AliTRDltuParam::fgWidthPad[6] =
	23	{0.635, 0.665, 0.695, 0.725, 0.755, 0.785};
	24	Float_t AliTRDltuParam::fgLengthInnerPadC1[6] =
	25	{7.5, 7.5, 8.0, 8.5, 9.0, 9.0};
	26	Float_t AliTRDltuParam::fgLengthOuterPadC1[6] =
	27	{7.5, 7.5, 7.5, 7.5, 7.5, 8.5};
	28	Float_t AliTRDltuParam::fgLengthInnerPadC0 = 9.0;
	29	Float_t AliTRDltuParam::fgLengthOuterPadC0 = 8.0;
	30	Float_t AliTRDltuParam::fgScalePad = 256. * 32.;
918cceaa	31	Float_t AliTRDltuParam::fgDriftLength = 3.;
5e86ff99	32
	33	AliTRDltuParam::AliTRDltuParam() :
	34	TObject(),
	35	fMagField(0.),
	36	fOmegaTau(0.),
	37	fPtMin(0.1),
	38	fNtimebins(20 << 5),
51380642	39	fScaleQ0(0),
51380642	40	fScaleQ1(0),
5e86ff99	41	fPidTracklengthCorr(kFALSE),
5f7c3c48	42	fTiltCorr(kFALSE),
5f7c3c48	43	fPidGainCorr(kFALSE)
5e86ff99	44	{
6419bebb	45	// default constructor
5e86ff99	46	}
	47
	48	AliTRDltuParam::~AliTRDltuParam()
	49	{
6419bebb	50	// destructor
5e86ff99	51	}
	52
	53	Int_t AliTRDltuParam::GetDyCorrection(Int_t det, Int_t rob, Int_t mcm) const
	54	{
	55	// calculate the correction of the deflection
	56	// i.e. Lorentz angle and tilt correction (if active)
	57
	58	Int_t layer = det % 6;
	59
16477104	60	Float_t dyTilt = ( fgDriftLength * TMath::Tan(fgTiltingAngle[layer] * TMath::Pi()/180.) *
5e86ff99	61	GetLocalZ(det, rob, mcm) / fgX[layer] );
	62
	63	// calculate Lorentz correction
	64	Float_t dyCorr = - fOmegaTau * fgDriftLength;
	65
	66	if(fTiltCorr)
	67	dyCorr += dyTilt; // add tilt correction
	68
	69	return (int) TMath::Nint(dyCorr * fgScalePad / fgWidthPad[layer]);
	70	}
	71
	72	void AliTRDltuParam::GetDyRange(Int_t det, Int_t rob, Int_t mcm, Int_t ch,
	73	Int_t &dyMinInt, Int_t &dyMaxInt) const
	74	{
	75	// calculate the deflection range in which tracklets are accepted
	76
	77	dyMinInt = fgDyMin;
	78	dyMaxInt = fgDyMax;
	79
39e4e4cf	80	if (TMath::Abs(fMagField) < 0.1)
5e86ff99	81	return;
	82
	83	Float_t e = 0.30;
	84
	85	Float_t maxDeflTemp = GetPerp(det, rob, mcm, ch)/2. * // Sekante/2
	86	(e * TMath::Abs(fMagField) / fPtMin); // 1/R
	87
	88	Float_t maxDeflAngle = 0.;
	89
	90	if (maxDeflTemp < 1.) {
	91	maxDeflAngle = TMath::ASin(maxDeflTemp);
	92
	93	Float_t dyMin = ( fgDriftLength *
	94	tan(GetPhi(det, rob, mcm, ch) - maxDeflAngle) );
	95
	96	dyMinInt = Int_t(dyMin / fgBinDy);
	97	if (dyMinInt < fgDyMin)
	98	dyMinInt = fgDyMin;
	99
	100	Float_t dyMax = ( fgDriftLength *
	101	TMath::Tan(GetPhi(det, rob, mcm, ch) + maxDeflAngle) );
	102
	103	dyMaxInt = Int_t(dyMax / fgBinDy);
	104	if (dyMaxInt > fgDyMax)
	105	dyMaxInt = fgDyMax;
	106	}
	107	if ((dyMaxInt - dyMinInt) <= 0) {
	108	printf("strange dy range: [%i,%i]\n", dyMinInt, dyMaxInt);
	109	}
	110	}
	111
	112	Float_t AliTRDltuParam::GetElongation(Int_t det, Int_t rob, Int_t mcm, Int_t ch) const
	113	{
6419bebb	114	// calculate the ratio of the distance to the primary vertex and the
	115	// distance in x-direction for the given ADC channel
	116
5e86ff99	117	Int_t layer = det % 6;
	118
	119	Float_t elongation = TMath::Abs(GetDist(det, rob, mcm, ch) / fgX[layer]);
	120
	121	// sanity check
	122	if(elongation<0.001) {
	123	elongation=1.;
	124	}
	125	return elongation;
	126	}
	127
	128	void AliTRDltuParam::GetCorrectionFactors(Int_t det, Int_t rob, Int_t mcm, Int_t ch,
5f7c3c48	129	UInt_t &cor0, UInt_t &cor1, Float_t gain) const
5e86ff99	130	{
6419bebb	131	// calculate the gain correction factors for the given ADC channel
6419bebb	132
5f7c3c48	133	if (fPidGainCorr==kFALSE)
	134	gain=1;
	135
5e86ff99	136	if (fPidTracklengthCorr == kTRUE ) {
5f7c3c48	137	cor0 = UInt_t ((1.0fScaleQ0 (1./GetElongation(det, rob, mcm, ch))) / gain );
5f7c3c48	138	cor1 = UInt_t ((1.0fScaleQ1 (1./GetElongation(det, rob, mcm, ch))) / gain );
5e86ff99	139	}
5e86ff99	140	else {
5f7c3c48	141	cor0 = UInt_t (fScaleQ0 / gain);
5f7c3c48	142	cor1 = UInt_t ( fScaleQ1 / gain);
5e86ff99	143	}
	144	}
	145
	146	Int_t AliTRDltuParam::GetNtimebins() const
	147	{
6419bebb	148	// return the number of timebins used
6419bebb	149
5e86ff99	150	return fNtimebins;
	151	}
	152
	153	Float_t AliTRDltuParam::GetX(Int_t det, Int_t /* rob /, Int_t / mcm */) const
	154	{
6419bebb	155	// return the distance to the beam axis in x-direction
6419bebb	156
5e86ff99	157	Int_t layer = det%6;
	158	return fgX[layer];
	159	}
	160
	161	Float_t AliTRDltuParam::GetLocalY(Int_t det, Int_t rob, Int_t mcm, Int_t ch) const
	162	{
6419bebb	163	// get local y-position (r-phi) w.r.t. the chamber centre
6419bebb	164
5e86ff99	165	Int_t layer = det%6;
5e86ff99	166	// calculate the pad position as in the TRAP
39e4e4cf	167	Float_t ypos = (-4 + 1 + (rob&0x1) * 4 + (mcm&0x3)) * 18 - ch - 0.5; // y position in bins of pad widths
5e86ff99	168	return ypos*fgWidthPad[layer];
	169	}
	170
	171	Float_t AliTRDltuParam::GetLocalZ(Int_t det, Int_t rob, Int_t mcm) const
	172	{
6419bebb	173	// get local z-position w.r.t. to the chamber boundary
6419bebb	174
5e86ff99	175	Int_t stack = (det%30) / 6;
	176	Int_t layer = det % 6;
	177	Int_t row = (rob/2) * 4 + mcm/4;
	178
	179	if (stack == 2) {
	180	if (row == 0)
	181	return (fgZrow[layer][stack] - 0.5 * fgLengthOuterPadC0);
	182	else if (row == 11)
	183	return (fgZrow[layer][stack] - 1.5 * fgLengthOuterPadC0 - (row - 1) * fgLengthInnerPadC0);
	184	else
	185	return (fgZrow[layer][stack] - fgLengthOuterPadC0 - (row - 0.5) * fgLengthInnerPadC0);
	186	}
	187	else {
	188	if (row == 0)
	189	return (fgZrow[layer][stack] - 0.5 * fgLengthOuterPadC1[layer]);
	190	else if (row == 15)
	191	return (fgZrow[layer][stack] - 1.5 * fgLengthOuterPadC1[layer] - (row - 1) * fgLengthInnerPadC1[layer]);
	192	else
	193	return (fgZrow[layer][stack] - fgLengthOuterPadC1[layer] - (row - 0.5) * fgLengthInnerPadC1[layer]);
	194	}
	195	}
	196
	197	Float_t AliTRDltuParam::GetPerp(Int_t det, Int_t rob, Int_t mcm, Int_t ch) const
	198	{
6419bebb	199	// get transverse distance to the beam axis
6419bebb	200
5e86ff99	201	return TMath::Sqrt(GetLocalY(det, rob, mcm, ch)*GetLocalY(det, rob, mcm, ch) +
	202	GetX(det, rob, mcm)*GetX(det, rob, mcm) );
	203	}
	204
	205	Float_t AliTRDltuParam::GetPhi(Int_t det, Int_t rob, Int_t mcm, Int_t ch) const
	206	{
6419bebb	207	// calculate the azimuthal angle for the given ADC channel
6419bebb	208
5e86ff99	209	return TMath::ATan2(GetLocalY(det, rob, mcm, ch), GetX(det, rob, mcm));
	210	}
	211
	212	Float_t AliTRDltuParam::GetDist(Int_t det, Int_t rob, Int_t mcm, Int_t ch) const
	213	{
6419bebb	214	// calculate the distance from the origin for the given ADC channel
6419bebb	215
5e86ff99	216	return TMath::Sqrt(GetLocalY(det, rob, mcm, ch)*GetLocalY(det, rob, mcm, ch) +
	217	GetX(det, rob, mcm)*GetX(det, rob, mcm) +
	218	GetLocalZ(det, rob, mcm)*GetLocalZ(det, rob, mcm) );
	219	}