| 1 | /***********************************************************************
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| 2 | ** **
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| 3 | ** /----------------------------------------------\ **
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| 4 | ** | Delphes, a framework for the fast simulation | **
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| 5 | ** | of a generic collider experiment | **
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| 6 | ** \------------- arXiv:0903.2225v1 ------------/ **
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| 7 | ** **
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| 8 | ** **
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| 9 | ** This package uses: **
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| 10 | ** ------------------ **
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| 11 | ** ROOT: Nucl. Inst. & Meth. in Phys. Res. A389 (1997) 81-86 **
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| 12 | ** FastJet algorithm: Phys. Lett. B641 (2006) [hep-ph/0512210] **
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| 13 | ** Hector: JINST 2:P09005 (2007) [physics.acc-ph:0707.1198v2] **
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| 14 | ** FROG: [hep-ex/0901.2718v1] **
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| 15 | ** HepMC: Comput. Phys. Commun.134 (2001) 41 **
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| 16 | ** **
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| 17 | ** ------------------------------------------------------------------ **
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| 18 | ** **
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| 19 | ** Main authors: **
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| 20 | ** ------------- **
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| 21 | ** **
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| 22 | ** Severine Ovyn Xavier Rouby **
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| 23 | ** severine.ovyn@uclouvain.be xavier.rouby@cern **
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| 24 | ** **
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| 25 | ** Center for Particle Physics and Phenomenology (CP3) **
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| 26 | ** Universite catholique de Louvain (UCL) **
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| 27 | ** Louvain-la-Neuve, Belgium **
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| 28 | ** **
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| 29 | ** Copyright (C) 2008-2009, **
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| 30 | ** All rights reserved. **
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| 31 | ** **
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| 32 | ***********************************************************************/
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| 33 |
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| 34 | #include "VeryForward.h"
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| 35 | #include "PdgParticle.h"
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| 36 | #include "H_RomanPot.h"
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| 37 |
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| 38 | #include <iostream>
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| 39 | #include <fstream>
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| 40 | #include<cmath>
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| 41 |
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| 42 | using namespace std;
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| 43 |
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| 44 | /* Notes on the correct initialisation for Hector
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| 45 | * -- these notes apply to the LHC beamlines
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| 46 | *
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| 47 | * beam1 : forward direction is for increasing 's' values
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| 48 | * beamline1 = new H_BeamLine(1,...);
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| 49 | * beamline1->fill(DET->RP_beam1Card,1,DET->RP_IP_name);
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| 50 | * beam2 : forward direction is for decreasing 's' values
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| 51 | * beamline2 = new H_BeamLine(-1,...);
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| 52 | * beamline2->fill(DET->RP_beam2Card,-1,DET->RP_IP_name);
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| 53 | *
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| 54 | * relative_energy should be false -- kickers_on should be 1
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| 55 | *
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| 56 | */
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| 57 |
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| 58 | //------------------------------------------------------------------------------
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| 59 | VeryForward::VeryForward() :
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| 60 | DET(new RESOLution()), d_max(1.+std::max(DET->RP_420_s,DET->RP_220_s)),
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| 61 | beamline1(new H_BeamLine(1,d_max)), beamline2(new H_BeamLine(-1,d_max)),
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| 62 | rel_energy(true), // should always be true
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| 63 | kickers(1) // should always be 1
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| 64 | {
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| 65 | init(); //Initialisation of Hector
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| 66 | }
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| 67 |
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| 68 | VeryForward::VeryForward(const string& DetDatacard) :
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| 69 | DET(new RESOLution())
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| 70 | {
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| 71 | DET->ReadDataCard(DetDatacard);
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| 72 | const float d_max = 1.+std::max(DET->RP_420_s,DET->RP_220_s);
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| 73 | beamline1 = new H_BeamLine(1,d_max);
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| 74 | beamline2 = new H_BeamLine(-1,d_max);
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| 75 | init(); //Initialisation of Hector
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| 76 | rel_energy = true; // should always be true
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| 77 | kickers = 1; // should always be 1
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| 78 | }
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| 79 |
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| 80 | VeryForward::VeryForward(const RESOLution * DetDatacard) :
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| 81 | DET(new RESOLution(*DetDatacard)), d_max(1.+std::max(DET->RP_420_s,DET->RP_220_s)),
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| 82 | beamline1(new H_BeamLine(1,d_max)), beamline2(new H_BeamLine(-1,d_max)),
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| 83 | rel_energy(true), // should always be true
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| 84 | kickers(1) // should always be 1
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| 85 | {
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| 86 | init(); //Initialisation of Hector
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| 87 | }
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| 88 |
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| 89 | VeryForward::VeryForward(const VeryForward& vf) :
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| 90 | DET(new RESOLution(*(vf.DET))), d_max(vf.d_max),
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| 91 | beamline1(new H_BeamLine(*(vf.beamline1))), beamline2(new H_BeamLine(*(vf.beamline2))),
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| 92 | rel_energy(vf.rel_energy),
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| 93 | kickers(vf.kickers) {
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| 94 | }
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| 95 |
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| 96 | VeryForward& VeryForward::operator=(const VeryForward& vf){
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| 97 | if (this==&vf) return *this;
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| 98 | DET = new RESOLution(*(vf.DET));
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| 99 | d_max = vf.d_max;
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| 100 | beamline1 = new H_BeamLine(*(vf.beamline1));
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| 101 | beamline2 = new H_BeamLine(*(vf.beamline2));
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| 102 | rel_energy =vf.rel_energy;
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| 103 | kickers = vf.kickers;
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| 104 | return *this;
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| 105 | }
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| 106 |
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| 107 |
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| 108 | void VeryForward::init() {
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| 109 | //Initialisation of Hector
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| 110 | static unsigned int counter;
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| 111 | counter =0;
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| 112 | extern bool relative_energy;
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| 113 | extern int kickers_on;
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| 114 | relative_energy = rel_energy; // should always be true
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| 115 | kickers_on = kickers; // should always be 1
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| 116 | beamline1->fill(DET->RP_beam1Card,1,DET->RP_IP_name);
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| 117 | beamline1->offsetElements(DET->RP_offsetEl_s,-DET->RP_offsetEl_x); // relative energy: does not change anything
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| 118 | H_RomanPot * rp220_1 = new H_RomanPot("rp220_1",DET->RP_220_s,DET->RP_220_x*1E6);
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| 119 | // RP 220m, 2mm, beam 1
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| 120 | H_RomanPot * rp420_1 = new H_RomanPot("rp420_1",DET->RP_420_s,DET->RP_420_x*1E6);
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| 121 | // RP 420m, 4mm, beam 1
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| 122 | //rp220_1->printProperties();
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| 123 | //rp420_1->printProperties();
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| 124 | beamline1->add(rp220_1);
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| 125 | beamline1->add(rp420_1);
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| 126 | //beamline1->alignElement("\"MQXA.1R5\"",+0.0005,0);
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| 127 | //beamline1->alignElement("\"MQM.9R5.B1\"",-0.0001,0);
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| 128 | //beamline1->alignElement("\"MQML.5R5.B1\"",+0.0001,0);
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| 129 |
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| 130 | beamline2->fill(DET->RP_beam2Card,-1,DET->RP_IP_name);
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| 131 | beamline2->offsetElements(DET->RP_offsetEl_s,-DET->RP_offsetEl_x); // relative energy: does not change anything
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| 132 | H_RomanPot * rp220_2 = new H_RomanPot("rp220_2",DET->RP_220_s,DET->RP_220_x*1E6);
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| 133 | // RP 220m, 2mm, beam 2
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| 134 | H_RomanPot * rp420_2 = new H_RomanPot("rp420_2",DET->RP_420_s,DET->RP_420_x*1E6);
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| 135 | // RP 420m, 4mm, beam 2
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| 136 | //rp220_2->printProperties();
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| 137 | //rp420_2->printProperties();
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| 138 | beamline2->add(rp220_2);
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| 139 | beamline2->add(rp420_2);
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| 140 | //beamline2->alignElement("\"MQXA.1L5\"",+0.0005,0);
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| 141 | // rp220_1, rp220_2, rp420_1 and rp420_2 will be deallocated in ~H_AbstractBeamLine
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| 142 | // do not put explicit delete
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| 143 | }
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| 144 |
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| 145 |
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| 146 | float VeryForward::time_of_flight(TRootGenParticle *particle, const float detector_s, const float detector_etamin, const float detector_t_resolution) {
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| 147 | // time of flight t is t = T + d/[ cos(theta) v ]
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| 148 | float cos_theta = 1; //very good approximation, if detector_etamin >3
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| 149 | if (detector_etamin<3) { // if smaller eta -> make the complete calculation
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| 150 | double tx = atan(particle->Px/particle->Pz);
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| 151 | double ty = atan(particle->Py/particle->Pz);
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| 152 | double theta = sqrt( pow(tx,2) + pow(ty,2) );
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| 153 | // cout << "tx = " << tx << " ty = " << ty << " theta = " << theta << " cos(theta) = " << cos(theta) << endl;
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| 154 | // NB: in practice, eta= 8 <-> theta 0.038° <-> 7x10^-4 rad <-> cos(theta) ~1
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| 155 | // eta = 2.6 <-> cos(theta) = 0.99
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| 156 | // eta = 3.0 <-> cos(theta) = 0.995
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| 157 | cos_theta = cos(theta);
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| 158 | }
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| 159 | // units from StdHEP : Z [mm] T[mm/c]
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| 160 | // units from Delphes : VFD_s_zdc [m] speed_of_light [m/s]
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| 161 | double flight_distance = (detector_s - particle->Z*(1E-3))/cos_theta ;
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| 162 | // assumes highly relativistic particles
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| 163 | double flight_time = (flight_distance + 1E-3 * particle->T )/speed_of_light;
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| 164 | double timeS = gRandom->Gaus(flight_time,detector_t_resolution);
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| 165 | return timeS;
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| 166 | }
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| 167 |
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| 168 |
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| 169 |
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| 170 | void VeryForward::ZDC(ExRootTreeWriter *treeWriter, ExRootTreeBranch *branchZDC, TRootGenParticle *particle)
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| 171 | {
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| 172 | TRootZdcHits *elementZdc;
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| 173 | float energy = particle->E;
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| 174 |
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| 175 | // Zero degree calorimeter, for forward neutrons and photons
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| 176 | if (particle->Status ==1 && ( (particle->PID==pN && energy>DET->ZDC_n_E) ||
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| 177 | (particle->PID==pGAMMA && energy>DET->ZDC_gamma_E) )
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| 178 | && fabs(particle->Eta) > DET->VFD_min_zdc ) {
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| 179 | elementZdc = (TRootZdcHits*) branchZDC->NewEntry();
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| 180 |
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| 181 | TLorentzVector genMomentum;
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| 182 | genMomentum.SetPxPyPzE(particle->Px, particle->Py, particle->Pz, particle->E);
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| 183 | elementZdc->Set(genMomentum); // initialises the gen-level data
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| 184 | elementZdc->pid = particle->PID;
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| 185 |
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| 186 | // 1) energy smearing
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| 187 | float energyS = -1.;
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| 188 | if (particle->PID == pGAMMA)
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| 189 | energyS = gRandom->Gaus(particle->E, sqrt( pow(DET->ELG_Nzdc,2) +
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| 190 | pow(DET->ELG_Czdc*particle->E,2) +
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| 191 | pow(DET->ELG_Szdc*sqrt(particle->E),2) ));
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| 192 | else // smearing with hadronic resolution
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| 193 | energyS = gRandom->Gaus(particle->E, sqrt( pow(DET->HAD_Nzdc,2) +
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| 194 | pow(DET->HAD_Czdc*particle->E,2) +
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| 195 | pow(DET->HAD_Szdc*sqrt(particle->E),2) ));
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| 196 | elementZdc->E = energyS;
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| 197 |
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| 198 | // 2) time of flight t is t = T + d/[ cos(theta) v ] + detector smearing on time
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| 199 | elementZdc->T = time_of_flight(particle, DET->VFD_s_zdc, DET->VFD_min_zdc, DET->ZDC_T_resolution);
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| 200 |
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| 201 | // 3) side: which ZDC has been hit?
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| 202 | elementZdc->side = sign(particle->Eta);
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| 203 |
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| 204 | // 4) object nature : e.m. (photon) or had (neutron) ?
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| 205 | elementZdc->hadronic_hit = (bool) (particle->PID!=pGAMMA);
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| 206 | } // if neutrons or photons over E_threshold
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| 207 |
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| 208 | }
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| 209 |
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| 210 |
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| 211 | void VeryForward::RomanPots(ExRootTreeWriter *treeWriter, ExRootTreeBranch *branchRP220,ExRootTreeBranch *branchFP420,TRootGenParticle *particle)
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| 212 | {
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| 213 | if(particle->Status != 1) return; // reject particles that are not final ones
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| 214 | extern bool relative_energy;
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| 215 | relative_energy = rel_energy;
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| 216 | extern int kickers_on;
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| 217 | kickers_on = kickers;
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| 218 |
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| 219 | float charge = particle->Charge, mass = particle->M;
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| 220 | //float charge, mass, ctau;
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| 221 | //charge = mass = ctau = UNDEFINED;
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| 222 | if (mass<-999) { // unitialised!
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| 223 | PdgParticle pdg_part = DET->PDGtable[particle->PID];
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| 224 | charge = pdg_part.charge(); // e+
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| 225 | mass = pdg_part.mass(); // GeV
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| 226 | // ctau = pdg_part.ctau(); // m
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| 227 | // cout << "ctau = " << ctau << endl;
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| 228 | }
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| 229 |
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| 230 |
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| 231 | if(particle->Charge==0) return; // only particles with Q=+1 can hope to reach RP200/FP420
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| 232 | //cout << "particle ("<< particle->PID << "): m = " << mass << " \t Q= " << charge << endl;
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| 233 | TRootRomanPotHits* elementRP220;
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| 234 | //TRootForwardTaggerHits* elementFP420;
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| 235 | TRootRomanPotHits* elementFP420;
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| 236 |
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| 237 | TLorentzVector genMomentum;
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| 238 | genMomentum.SetPxPyPzE(particle->Px, particle->Py, particle->Pz, particle->E);
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| 239 |
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| 240 | // to go faster, why not rejecting particles already going into the ZDC?
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| 241 |
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| 242 | // K_L^0 has a ctau of ~16m ; only pi+ and p+ can beat it ;
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| 243 | // so if RP/FP too far away, the particle must be a proton or a mu+
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| 244 | if( std::min(DET->RP_420_s,DET->RP_220_s) > 17 && (particle->PID != pP && particle->PID != 13)) return;
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| 245 | if( fabs(genMomentum.Eta()) > DET->CEN_max_calo_fwd )
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| 246 | {
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| 247 | H_BeamParticle p1(mass,charge);
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| 248 | double tx = 1E6*atan(particle->Px/particle->Pz); // in microrad
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| 249 | double ty = 1E6*atan(particle->Py/particle->Pz); // in microrad
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| 250 | //p1.smearAng(); p1.smearPos(); // vertex smearing do not put it here !!!
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| 251 |
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| 252 | /* cout << "x = " << particle->X << " + " << p1.getX() << " + " << DET->RP_cross_x
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| 253 | << " y= " << particle->Y << " + " << p1.getY() << " + " << DET->RP_cross_y
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| 254 | << " tx= " << tx << " + " << p1.getTX() << " - " << kickers_on*DET->RP_cross_ang_x
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| 255 | << " ty= " << ty << " + " << p1.getTY() << " - " << kickers_on*DET->RP_cross_ang_y
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| 256 | << " z= " << particle->Z << endl;*/
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| 257 |
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| 258 | // here below, p1.getX(), p1.getY(), p1.getTX() and p1.getTY() =0 unless some smearing is done
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| 259 | // all in micrometers or microradians
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| 260 |
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| 261 | // for checking purposes
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| 262 | /*p1.smearAng(); p1.smearPos(); tx=0; ty=0; // to be removed !!!! test only !!!!
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| 263 | ofstream xdist("xdist",ios::ios_base::app);
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| 264 | xdist << endl;
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| 265 | xdist << (1E3)*particle->X + p1.getX() + DET->RP_cross_x << " = " << (1E3)*particle->X << " + " << p1.getX() << " + " << DET->RP_cross_x << endl;
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| 266 | xdist << (1E3)*particle->Y + p1.getY() + DET->RP_cross_y << " = " << (1E3)*particle->Y << " + " << p1.getY() << " + " << DET->RP_cross_y << endl;
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| 267 | xdist << tx + p1.getTX()- kickers_on*DET->RP_cross_ang_x << " = " << tx << " + " << p1.getTX() << " - " << kickers_on << "*" << DET->RP_cross_ang_x<< endl;
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| 268 | xdist << ty + p1.getTY()- kickers_on*DET->RP_cross_ang_y << " = " << ty << " + " << p1.getTY() << " - " << kickers_on << "*" << DET->RP_cross_ang_y<< endl;
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| 269 | xdist.close();
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| 270 | */
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| 271 |
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| 272 |
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| 273 | p1.setPosition((1E3)*particle->X + p1.getX() + DET->RP_cross_x,
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| 274 | (1E3)*particle->Y + p1.getY() + DET->RP_cross_y,
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| 275 | tx + p1.getTX()- kickers_on*DET->RP_cross_ang_x,
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| 276 | ty + p1.getTY()- kickers_on*DET->RP_cross_ang_y,
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| 277 | 0*(1E3)*particle->Z);
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| 278 | p1.setE(particle->E);
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| 279 |
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| 280 | H_BeamLine *beamline;
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| 281 | if(genMomentum.Eta() >0) beamline = beamline1;
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| 282 | else beamline = beamline2;
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| 283 |
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| 284 | p1.computePath(beamline,1);
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| 285 |
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| 286 | if(p1.stopped(beamline)) {
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| 287 | // roman pots at 220 m
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| 288 | if (p1.getStoppingElement()->getName()=="rp220_1" || p1.getStoppingElement()->getName()=="rp220_2") {
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| 289 |
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| 290 | /*static unsigned int counter;
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| 291 | counter++;
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| 292 | if (counter==1) {
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| 293 | p1.getPath(0,"p1path.txt");
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| 294 | cout << "RP : " << particle->PID << "\t" << charge << "=" << particle->Charge
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| 295 | << "\t" << mass << "=" << particle->M << "\t E=" << particle->E << endl;
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| 296 | }*/
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| 297 |
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| 298 | p1.propagate(DET->RP_220_s);
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| 299 | elementRP220 = (TRootRomanPotHits*) branchRP220->NewEntry();
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| 300 |
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| 301 | // detector measurements
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| 302 | elementRP220->X = (1E-6)*p1.getX(); // [m]
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| 303 | elementRP220->Y = (1E-6)*p1.getY(); // [m]
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| 304 | elementRP220->Tx = (1E-6)*p1.getTX(); // [rad]
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| 305 | elementRP220->Ty = (1E-6)*p1.getTY(); // [rad]
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| 306 | elementRP220->S = p1.getS(); // [m]
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| 307 | elementRP220->T = time_of_flight(particle, DET->RP_220_s, DET->CEN_max_calo_fwd, DET->RP220_T_resolution);
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| 308 | elementRP220->side = sign(particle->Eta);
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| 309 |
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| 310 | // reconstructed data
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| 311 | float sE = p1.getE(); // apply the smearing here!!!
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| 312 | elementRP220->E = sE; // not yet implemented
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| 313 | elementRP220->q2 = UNDEFINED; // not yet implemented
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| 314 |
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| 315 | // generator level data
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| 316 | elementRP220->pid = particle->PID;
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| 317 | elementRP220->Set(genMomentum);
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| 318 | } // if RP220
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| 319 |
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| 320 | // proton taggers at 420 m
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| 321 | else if (p1.getStoppingElement()->getName()=="rp420_1" || p1.getStoppingElement()->getName()=="rp420_2") {
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| 322 |
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| 323 | p1.propagate(DET->RP_420_s);
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| 324 | elementFP420 = (TRootRomanPotHits*) branchFP420->NewEntry();
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| 325 | //elementFP420 = (TRootForwardTaggerHits*) branchFP420->NewEntry();
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| 326 |
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| 327 | // detector measurements
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| 328 | elementFP420->X = (1E-6)*p1.getX(); // [m]
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| 329 | elementFP420->Y = (1E-6)*p1.getY(); // [m]
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| 330 | elementFP420->Tx = (1E-6)*p1.getTX(); // [rad]
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| 331 | elementFP420->Ty = (1E-6)*p1.getTY(); // [rad]
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| 332 | elementFP420->S = p1.getS(); // [m]
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| 333 | elementFP420->T = time_of_flight(particle, DET->RP_420_s, DET->CEN_max_calo_fwd, DET->RP420_T_resolution);
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| 334 | elementFP420->side = sign(particle->Eta);
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| 335 |
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| 336 | // reconstructed data
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| 337 | elementFP420->E = p1.getE(); // not yet implemented
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| 338 | elementFP420->q2 = UNDEFINED; // not yet implemented
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| 339 |
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| 340 | // generator level data
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| 341 | elementFP420->pid = particle->PID;
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| 342 | elementFP420->Set(genMomentum);
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| 343 | } // if FP420
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| 344 |
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| 345 | } // if stopped
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| 346 | } // if forward proton
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| 347 |
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| 348 | }
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