Table of Contents

• Introduction
• Installation
• Source code installation
• Restoring the geant-dirac.cmz
• Compiling
• Running the program
• Starting batch version
• Starting interactive version
• Output of the program
• Structure of cmz file
• Program flow chart
• Setup geometry
• Detectors
• Magnetic field
• Generators
• References

Introduction

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The GEANT-DIRAC code is main simulation program for the DIRAC experiment at CERN. The code is written in frame of the GEANT 3.21 package. The Version 2.69 of the GEANT-DIRAC code (the geant-dirac.tar.gz archive) can be downloaded from the directory:

• The geometry, positions and materials of the detectors are initialized in the program by reading the external files common with offline program Ariane (currently det2002_68.dat and mod2002_32.dat for 2002 year) [3]. These datafiles (and datafiles for 1999 - 2001 years) can be downloaded from the directory

  /afs/cern.ch/user/d/diracww/public/offline/ariane/data

• The results of simulation is kept in standard output file (by default buffer.dat, but this name can be changed through appropriate data card). This file contains the full "history" of each detected particle. See "Monte Carlo block format" in [3] about the format of this file. The file includes the information about version of the code, specific format, seeds for random number generator both for geant-dirac and for particle generator, which was used in the case (when the initial kinematics is read from external file, the ordinal event number is written instead of seeds). The information about the reactions, times, parameters of the vertices, particle codes, particle momenta and energies are written for the paricles which hit the detectors and for their "parent" particles. Information on the detectors measurements includes
  • Identification (Detector/Plane)
  • Coordinates X,Y,Z of an intersection of the track with the detector
  • Time of interaction
  • Ionization losses
  • Momentum components PX,PY,PZ at this intersaction.
  The file is written in NETWORK ENDIAN byte order. There is also possible to write this file in simplified form ("reduced" format).
• The approximation [7] of the magnetic field map, based on the measurements [2] is used in the program.
• The following event generators can be used:
  • for the particles coming from dimesoatom ionization
  • for all particles coming from the target
  • for the paticles emitted into the setup channel only.

The program works under operating systems UNIX and Windows 95/98/NT.

For the description of previous versions see version 2.5 [1] and version 2.6 manuals.
 

1. Installation

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Source code installation from cmz file

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• Batch version of the program.
  To install this version the following command should be typed:
  

  cmz -install geant-dirac third batch hall X11 mf

• Interactive version with the X11 graphical interface.
  To install this version the command should be modified:
  

  cmz -install geant-dirac third interact hall X11 mf

• Interactive version with the Motif graphical interface.
  To install this version the command should have the view:
  

  cmz -install geant-dirac third interact hall Motif mf

Remark: There are no "defaults" in the command line. All keys should be typed.
During the installation the following additional files will appear in working directory:


• readme_v2_61, readme_v2.69 - descriptions of the mofifications in the code
• kine_f.dat - input file for the program (100 events for a testing)
• makefile - makefile in accordance with operational system
• jobcrds.dat - data records
• flukaaf.dat - data file for FLUKA
• distr.kumac - macros to draw the histograms from the file "distr.his"
• diracxz2.kumac, diracyz2.kumac etc. - macroses for the interactive version
• the files describing the magnetic field in the directory magnet_data


Additionally the appropriate (according to specific run number) versions of the files which describe the detectors data (det2002_68.dat and mod2002_32.dat for 2002 year) should be copied to the working directory.



Restoring the geant-dirac.cmz

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To restore geant-dirac.cmz from geant-dirac.car


• open CMZ session without any parameters:
  cmz
  
• create new file geant-dirac:
  create geant-dirac
  
• read geant-dirac.car into cmz - file:
  arc geant-dirac.car
  
• close CMZ session:
  exit




Compiling

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During the installation process the appropriate makefile will appear in working directory. This file contains main instructions for a compilation in accordance with the specific platform.


• Example: makefile for the interactive version of the geant-dirac program with X11 graphical interface for lxplus (Linux)

       F77 =g77
       CC  =g77
       FFLAGS= -g
       GLOB= -G X11
       GL  = graflib/X11
       LDLIBS=`cernlib $(GLOB) geant321 pawlib graflib $(GL) packlib mathlib`
       #
       geant-dirac: geant-dirac.o
  	$(F77) -o geant-dirac geant-dirac.o $(LDLIBS) -lcrypt
       geant-dirac.o:geant-dirac.f
  	$(F77) -c $(FFLAGS) geant-dirac.f
      

• To compile the program type make. The executable module geant-dirac will be created.
  
  


Figure: Example of the geant-dirac X11 session: tracks from 100 pion pairs from the target along with tracks from secondary interactions



Running the program

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Before running the program one should need to set appropriate parameters in the jobcrds.dat.


• jobcrds.dat:

  C The user's manual of the program is available at:
  C http://gortchak.home.cern.ch/gortchak/geant-dirac/montecarlo/instruction/instruct26.html
  C
    LIST
  C
  C      KRUG=1 means that multiple scattering goes according Kruglov's formula
  C      otherwise(KRUG=0) Molier will be taken
   KRUG 1
  C
  C
    KINE 0
  C
    FILE 'det2002_68.dat'
    MODF 'mod2002_32.dat'
    OUTF 'buffer.dat'
    KINF 'kine_f.dat'
  C
  C...ONLY FOR OLD VERSIONS OF THE DETECTORDATA FILE:
  C DB   'NO'
  C...FOR NEW VERSIONS OF THE DETECTORDATA FILE:
    DB   'YES'
  C
  C...TRIGG N, N - NUMBER OF EVENTS
  C
    TRIG 100
  C
  C...HADR = 4 FOR FLUKA
  C
    HADR 4
  C...
  C   SWIT(1) = K + 10*N + 1000*M
  C                         ==>  K = 0 BASE FORMAT OF BUFFER.DAT
  C                         ==>    = 1 REDUCED FORMAT OF BUFFER.DAT
  C
  C                         ==>  N < 100 - SIZE OF EVENT DATA BLOCK
  C                         ==>  M       - NUMBER OF USER WORDS
  C
  C   SWIT(2) = XYZ*100+L   ==>  X.YZ - GEANT-DIRAC VERSION NUMBER
  C                         ==>  L = 0 INTEGER EVENT WEIGHT
  C                         ==>  L = 1 REAL EVENT WEIGHT
  C   2.69 means  the new numbering of cherenkov and aerogel detectors; + and - signs
  C   which is used from 2007
  C
  C...PARAMETERS FOR EXTERNAL FILE READING
  C
  C   SWIT(3) =  0   ==>  FOR BACKGROUND ESTIMATION
  C   SWIT(3) =  1   ==>  FOR FAST EVENT GENERATOR (GENER)
  C   SWIT(3) =  2   ==>  FOR NEW EVENT GENERATOR (GENTLEMAN)
  C   SWIT(3) =  3   ==>  FOR A2PI EVENT GENERATOR (G)
  C   SWIT(3) =  4   ==>  MULTIPLE INTERACTIONS IN THE TARGET
  C
  C...TARGET
  C
  C   SWIT(10) = 1 - Be
  C            = 2 - Ti
  C            = 3 - Ni
  C            = 4 - Mo
  C            = 5 - Pt
  C
  C...OTHER FLAGS
  C
  C   SWIT(4)  =  1   ==>  CALL GPKINE AND GPVERT
  C            =  2   ==>  CALL GPHITS
  C            =  3   ==>  CALL GPKINE, GPVERT AND GPHITS
  C
  C   SWIT(5)  =  0   ==>  EXISTING GEOMETRY
  C            =  1   ==>  FOR TESTING OF NEW DETECTORS
  C
  C   SWIT(6)  =  0   ==>  FILLING OF  buffer.dat
  C   SWIT(7)  =  0   ==>  FILLING OF  buffer_c.dat
  C   SWIT(8)  =  1   ==>  FILLING OF  geant-dirac.err FILE
  C
  C
  C EXAMPLE: FORMAT OF BUFFER.DAT     --> BASIC,
  C          SIZE OF EVENT DATA BLOCK --> 10,
  C          NO USER WORDS;
  C          EVENT GENERATOR          --> GENTLEMAN,
  C          NO FILLING OF buffer_c.dat
  C          TARGET                   --> Ti
  C
  C......1...2......3...4...5...6...7...8...9...10
  C
    SWIT 100 26900  2   0   0   0   1   0   0   2
  C
  C
    DEBU 1 100 5
    RUNG 4302 1
    RNDM 1933218839   695641158
    AUTO 0
    LOSS 1
    CUTS 0.001 0.001 0.01 0.01 0.01 0.001 0.001 0.001 0.001
    STOP
    END
    EOF
  

Where


• DB - flag indicating that input file is written in "DB" format
  • = 'YES'
  • = 'NO'
• FILE - geometry file name
• MODF - "materials" file name
• OUTF - output file name
• KINF - input (kinematics) file name
• TRIG - total number of events to process
• HADR - hadronic process
  = 4 for FLUKA
  others for GHEISHA
• SWIT - user flags
  
  • SWIT(1) = K + 10*N + 1000*M
    - K choice between standard (=0) and reduced (=1) output format
    - N size of event data block in output file (currently 10)
    - M opportunity to add M user words to the output file for each event (by default M=0)
  • SWIT(2) = XYZ*100+L
    - setting the version number of the geant-dirac code (current version 2.61) and opportunity to use event weight as real*4 word
  • SWIT(3) - type of generator
    = 0 Generator of proton-nucleus interactions
    = 1 GENER code
    = 2 GENtLeman code
    = 3 A2pi generator
    = 4 multipurposes generator (with possibility of using multiple interactions in the target)
  • SWIT(4)
    this switch is used for debugging
    = 1 - printing the contents of KINE and VERT banks for each event
    = 2 - printing the contents of HITS bank only
    = 3 - printing the contents of KINE, VERT and HITS banks
  • SWIT(5)
    switching to test version of the setup geometry (=1)
  • SWIT(6)
    to switch off filling of buffer.dat file (=1)
  • SWIT(7)
    to switch off filling of buffer_c.dat file (=1)
  • SWIT(8)
    to control of program performance by filling of geant-dirac.err file (=1)
  • SWIT(10) - choosing of target type:
    = 1 Beryllium
    = 2 Titanium
    = 3 Nickel
    = 4 Molybden
    = 5 Platinum
    
• DEBU - 3 words: first event to debug, last event to debug, control frequency
• RUNG - 2 words: run number, first event number in the run
• RNDM - 2 words: initial random number seed
• AUTO
  = 1 automatic computation of the tracking medium parameters
  = 0 user tracking medium parameters
• LOSS - energy losses fluctuations
  = 1 resticted fluctuations (in case of generation of delta-rays)
  = 2 full fluctuations
• CUTS - energy cuts in GeV




Starting batch version:

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• Simplest way to start the program is to type
  geant-dirac (Enter)
  
• Other possibility is to use LSF Batch system which provides a Motif - based Graphical User Interface for submitting a job in the queue
  
  

Starting interactive version:

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• Type
  geant-dirac
  
• Then in reply on "Workstation type", press Enter in case of X11 or motif (then Enter ) in case of Motif user interface
  
• To draw the setup, type the name of needed macros (for example, for viewing top view of the whole setup) exec diracxz2
  
• Then to see the tracks (from, for example, 100 interactions in the target), type trig 100
  
• To quit the program, type
  quit
  




Output of the program:

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• buffer.dat - binary MC block. This file can be read by ARIANE [3], by READBUFFER code (for simple testing) [11] and by PICASSO code (for vizualization and debugging) [12]
• buffer_c.dat - ASCII MC block (for debugging)
• distr.his - RZ file with histograms (hitmaps and ionization losses distributions for the setup detectors)
• rndm.dat - contains random number seeds (recorded at every 500 events)
  
  

Figure: Screen view for the geant-dirac session with the Motif user interface

2. Structure of CMZ file

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• BD (blockdata)
• MAIN (dirac; head program for batch version)
• GXINT1 (gxint321; head program for interactive version with X11 graphical interface)
• GXINT2 (gxint321; head program for interactive version with the Motif graphical interface)
• GEOM1 (obsolete)
• GEOM2 (obsolete)
• GEOM4 (ugeom, parculc, rcntyz, a1, a2, a3, prod, sec2pr, pr2sec, st2tl, st2tr, dginit, dginitdb, rotatematrix, geometry, geometrydb, materials, transp, euler, axes, mxv, matx, maty, matz, fshgeometry, fshgeometry, scifigeometry, msgcgeometry, mdcgeometry, horhodoscopesgeometry, cherenkovcountersgeometry, preshowersgeometry, muoncountersgeometry, verhodoscopesgeometry;
  subroutines for specification of the setup geometry)
• INIT
  • uginit; program initialization
  • ubook; booking of histograms
• GENERAL
  • gukine; initial kinematics
  • gustep; user operations on each step of tracking: recording of hits in data structure JHITS etc.
  • gutrak; control of tracking for each track
  • gutrev; control of event
  • uglast; program termination
  • umate; materials definition
  • guphad, guhadr; the user routines which are called at each step when a hadronic process has been selected
  • udet; detectors definition
  • guout; perform all the processing at the end of the event and output the relevant data structures
  • guout2; filling of histograms
  • targint1, targint2, targint3; find the interaction number and the time of interaction in the target
  • hitscorr; correction of hits coordinates
  • mech2; copies the character-type names of the interaction mechanisms into Hollerith characters
  • byteswp; performs byte swapping
• MAGNET (gufld, trackd, a0take, entr1, bfield, jjfun, test; magnetic field subroutines)
• FOPEN (ufiles1, ufiles2)
• $KUMACS
  • install, incl; macroses for installation of the source code and needed environment
  • makefile
  • jobcrds; data records
  • flukaaf; data file for FLUKA
  • diracxz2, diracyz2, diryzm21, diryzm22, dirxzm21, diracyz1, dirxzm22; macroses for the interactive version
  • instruct; instruction, html file
  • distr; macros to process file "distr.his"
  • kine; input file for testing
• $VERSION (v2.00, . . . , v2.60, v2.61, v2.69)
• GCDES (obsolete)
• DDES (obsolete)
• GCM ($gclist, $gccuts, etc.; various geant321 sequences)
• DDESM (ddesm; various user defined sequences)
• BACKGR (not used in this version)
• TEST

3. Program flow chart

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• MAIN (GXINT)
  • GZEBRA initialization of ZEBRA system, dynamic core allocation
  • UGINIT user initializations
    • GINIT initialize the GEANT common blocks
    • UFILES1 open data records file (jobcrds.dat)
    • GFFGO read data records
    • UFILES2 open input, output and others files
    • GZINIT initialize the memory manager
    • GPART fill the data structure JPART with the particle properties
    • GPIONS store the standard ions constants in the JPART
    • GMATE creation of the material data structure JMATE
    • DGINITdb read geometrical information from external file /DGINIT
      • GEOMETRYdb /GEOMETRY
    • UGEOM define the geometry of the components of the setup, tracking medium parameters etc.
      • FSHgeometry
      • SCIFIgeometry
      • MSGCgeometry
      • MDCgeometry
      • VerHodoscopesGeometry
      • HorHodoscopesGeometry
      • CherenkovCountersGeometry
      • CherenkovCountersGeometrynew
      • CherenkovCountersGeometryHeavy
      • AeroGelCountersGeometry
      • PreshowersGeometryNew
      • PreshowersGeometry
      • MuonCountersGeometry
      • GGCLOS process the geometrical information for particle transport
    • UMATE define additional materials
    • UDET define the detectors parameters
    • GPHYSI compute energy loss and cross-section tables and store them in the JMATE
    • UBOOK booking of histograms
    • GRUN event processing
      • GTRIGI initialization
      • GTRIG process one event
        • GUKINE define initial kinematics
        • GUTREV control of event
          • GTREVE
            • GUTRAK control of tracking for each track
              • GTRACK
                • GTGAMA /GTELEC
                  • GUSWIM
                    • GRKUTA /CHELIX
                      • GUFLD magnetic field subroutines
                        • BFIELD
                    • /CHELX3
                • /GTMUON
                  • GUSWIM
                    • GRKUTA /CHELIX
                      • GUFLD magnetic field subroutines
                        • BFIELD
                    • /CHELX3
                • /GTNINO
                • /GTNEUT
                • /GTHADR
                  • GUPHAD the user routines which are called at each step when a hadronic process has been selected
                    • GPGHEI /FLDIST
                  • GUHADR the user routines which are caled at each step when a hadrinic process has been selected
                    • GHEISH /FLUFIN
                      • GUSTEP user operations on each step of tracking: recording of hits in data structure JHITS etc.
                        • GSXYZ
                        • (GDCXYZ)
                  • GUSWIM
                    • GRKUTA /CHELIX
                      • GUFLD
                        • BFIELD
                    • /CHELX3
        • GUOUT perform all the processing at the end of the event and output the relevant data structures
          • GUOUT2 fill the histograms (hitmaps and energy losses)
    • GTRIGC cleaning of memory for next event
    • UGLAST user actions at the end of the program
      • GLAST standard GEANT termination

4. Setup geometry

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• VOLM ­ general volume
• TARG ­ target
• MARG, MARV, MARH ­ target station
• FLN1, FLV1 ­ flange
• BEL1, BEV1 ­ sylphon
• TR11, TV11 ­ tube
• TRB1, TRV1, OPZ2, OSZ2 ­ wide tube
• TR12, TV12 ­ tube for primary beam
• TR13, TV13 ­ tube for secondary beam
• FLB1 exit flange of thick vacuum tube
• FLM1, FVM1 ­ flange
• FLM2, FVM2 ­ flange
• MEM1 ­ membrane
• FLN2, FLV2 ­ flange
• TRB2, TRV2 ­ tube for primary beam
• MSG1, MSG2, MSG3, MSG4, MS1, MS2, MS3, MS4 basic volumes for microstrip gas chambers
  • VMC1 - VMC9, VM10 - VM17 elements of MSGC construction
• FIB1, FIB2, FBS1, FBS2 ­ fibre detector volumes
• Ionization hodoscope (IH)
  • First plane DDX1
    Slabs S11 - S19, S110 - S116
  • Second plane DDX2
    Slabs S21 - S29, S210 - S216
  • Third plane DDXH (Slabs SH1-SH8) for run numbers less than 3428
    Third plane DDX3 (Slabs S31-S39, S310-S316) for run numbers greater or equal to 3428
    
  • Forth plane DDX4 (Slabs S41-S49, S410-S416) only for run numbers greater or equal to 3428
    
  • SUPI, SUP1, SUP2, ROWI, PHML, PHMV ­ support and photomultipliers for DEDX - for run numbers less than 3428
    
  • VIH1 - VIH9 elements of new ionisation hodoscope construction - only for run numbers greater or equal to 3428
    
• FLN3, FLV3 ­ flange
• FL31, FV31 ­ flange
• MCOL ­ membrane
• TRB3, TRV3 ­ tube for secondary beam
• FLN4, FLV4 ­ flange
• FL41, FV41 ­ flange
• CWAL, CWLO, CWUP ­ wall for collimator
• COLL, HCOL ­ collimator
• FLN5, FLV5 ­ flange
• PHOL ­ hole for primary beam
• TRB4, TRV4 ­ tube for primary beam
• TRB5, TRV5 ­ tube for primary beam
• FLN6, FLV6 ­ flange
• BEL2, BEV2 ­ sylphon
• FLN7, FLV7 ­ flange
• TRB6, TRV6 ­ tube for secondary beam
• FLN8, FLV8 ­ flange
• TRB7, TRV7 ­ tube for secondary beam
• FLN9, FLV9 ­ flange
• TRB8 ­ tube for secondary beam
• TRB9, TRV9 ­ tube for secondary beam
• FLNA, FLVA ­ flange before flat vacuum chamber
• MAG1, MAG2, MAG3, MAG4, MAG5 ­ magnet
• MGC1, MGC2, MGC3, MGC4, MGC5 ­ coils
• MGAP ­ gap between magnet poles
• SCR1 - SCR7 ­ magnetic screens
• FLNB, FLVB ­ flange before flat vacuum chamber
• FCH1 - FCH6, VCH1 - VCH6 ­ flat vacuum chamber
• FLNC, FLVC ­ flange after flat vacuum chamber
• VCMB ­ membrane of flat vacuum chamber
• EPOX, EPOA, FLND, FLVD ­ flange after flat vacuum chamber
• VFF1 - VMF4 - additional volumes for magnetic field setting
• FLOO ­ floor
• STN1 ­ support for magnet
• WAL1, WAL2, WAL3, WAL4 ­ left shielding walls
• WAL5, WAL6, WAL7, WAL8 ­ right shielding walls
• WAL9 ­ transverse shielding wall
• HWAL ­ hole for primary beam
• CLN1, CLN2, CLN3, CLN4, CLN5 ­ ceiling
• BLK1 - BLK3 beton blocks supporting muon filters and preshowers
• BM1 - BM3 beton blocks supporting some other elements of the setup
• Front drift chamber
  • VD01, VL01, VD1L, VD1R, FA00, FR00, FRA0, FRR0 ­ frames
• Additional elements for the drift chambers
  • Support frames for the drift chambers
    CRD1 - CRD5, CRA1 - CRA5, PLAT
  • Support for the drift chambers
    STT1 - STT8, STA1 - STA8, STD1, SHV1 - SHV3, SHA1 - SHA3, STB1, STB2
• LEFT - auxiliary volume for left telescope
  • Left telescope drift chambers
    D1XL, D1YL, D1Wl, D2XL, D2YL, D2WL, VD11, VL11, VD12, VL12, VD13, VL13 L_1X, L_1Y, L_2X, L_2Y, L31X, L31Y, L32X, L32Y,
    VW11, VW12, VW13 - mylar windows
    WXA, WXF, WYA1 - WYA3, WYF1 - WYF3 ­ wares
    FA00, FR00, FRA0, FRA1 - FRA3, FRR1 - FRR3 ­ frames
    
  • Left vertical hodoscope
    VH1, VL1 - VL18
  • Left horizontal hodoscope
    HH1, HL1 - HL18
  • Left Cherenkov counter
    VC1, VC1I, VC10, VC1U, VC11, VC12, V101-V105, CHL1, CHL2
  • Left preshower
    PRLE, PRE1, PL1 - PL8
  • Left absorber
    BOXL
    BOX1 - BOX5 (these blocks are the same for both telescopes)
  • Left muon counter
    MUSL, ML1 - ML28
• RIGH - auxiliary volume for right telescope
  • Right telescope drift chambers
    D1XR, D1YR, D1WR, D2XR, D2YR, D2WR, VD21, VL21, VD22, VL22, VD23, VL23, R_1X, R_1Y, R_2X , R_2Y, R31X, R31Y, R32X, R32Y,
    VW21, VW22, VW23 - mylar windows
    WXA, WXF, WYA1 - WYA3, WYF1 - WYF3, ­ wares
    FA00, FR00, FRA0, FRA1 - FRA3, FRR1 - FRR3 ­ frames
    
  • Right vertical hodoscope
    VH2, VR1 - VR18
  • Right horizontal hodoscope
    HH2, HR1 - HR18
  • Right Cherenkov counter
    VC2, VC2I, VC20, VC2U, VC21, VC22, V201-V205, CHR1, CHR2
  • Right preshower
    PRLE, PRE2, PR1 - PR8
  • Right absorber
    BOXR
    BOX1 - BOX5 (these blocks are the same for both telescopes)
  • Right muon counter
    MUSR, MR1 - MR28

5. Detectors

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• MSGC set - Microstrip Gas Chamber
  • Detectors MS1 - MS4
• FIBR set - Fiber Detector
  • Detectors FBS1, FBS2
• FSH set - Ionization Hodoscope (Forward Scintillation Hodoscope)
  • FSHV1:
    Detectors (separate slabs) S11 - S19, S110 - S116
    
  • FSHV2:
    Detectors (separate slabs) S21 - S29, S210 - S216
    
  • FSHH :
    Detectors (separate slabs) SH1 - SH8
• DRFT set - Drift Chambers
  • Detectors
    D1XL, D1XR, D1YL, D1YR, D2XL, D2XR, D2YL, D2YR,
    L_1X, L_1Y, L_2X, L_2Y, L31X, L31Y, L32X, L32Y,
    R_1X, R_1Y, R_2X, R_2Y, R31X, R31Y, R32X, R32Y,
    
• LEFT set - Group of Left Arm Detectors (excluding drift chambers and Cherenkov detectors)
  • VLH:
    Detectors (separate slabs) VL1 - VL18
    
  • HLH:
    Detectors (separate slabs) HL1 - HL16
    
  • PRLEFT:
    Detectors (separate slabs) PL1 - PL8
    
  • MULEFT:
    Detectors (separate slabs) ML1 - ML28
    
• RIGH set - Group of Right Arm Detectors (excluding drift chambers and Cherenkov detectors)
  • VRH:
    Detectors (separate slabs) VR1 - VR18
    
  • HRH:
    Detectors (separate slabs) HR1 - HR16
    
  • PRRIGH:
    Detectors (separate slabs) PR1 - PR8
    
  • MURIGH:
    Detectors (separate slabs) MR1 - MR28
    
• CHER set - Cherenkov detectors
  • CHL1, CHL2 (left arm)
  • CHR1, CHR2 (right arm)
    
    

6. Magnetic field

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Figure: The components of the magnetic field in the median plane at y = 0 (measured area)

7. Generators

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• The generator of proton-nucleus interactions on the base of modified FRITIOF code [4-6]. This generator is used for background estimations. Full archive fritiof6m.zip and the corresponding instruction (compressed postscript file mfritiof.zip) can be downloaded from the directory
  
  

  /afs/cern.ch/user/z/zrelov/public/geant-dirac/version2.6/generator

  
  The file kine_f.dat containing about 10^5 events can be downloaded from the same directory. To read this file by the geant-dirac program SWIT(3) should be set to 0.
• Program GENER [8]. It generates particles coming from the target according to the inclusive angular and momentum distributions obtained using FRITIOF-6. Interactions are generated inside time intervals of 300 ns duration. This generator can be used to study of the trigger scheme. There is a possibility of dimesoatom generation. SWIT(3) = 1.
• New event generator GENtLeman [9]. The generator uses the modified FRITIOF-6m code. It is possible to use any of the targets Be, Ti, Mo, Ni, Pt. SWIT(3) = 2.
• Two specialized A2pi generators. SWIT(3) = 3.
  • written by Oleg Gortchakov.
  • written by Cibran Santamarina Rios (/afs/cern.ch/user/d/diracww/public/offline/generator/).

8. References

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1. P. Zrelov, V. Yazkov: The Geant-Dirac Simulation Program Version 2.5. Installation Remarks. Dirac Note 98-08, December 1998. Back
2. M. Gallas, O. Gorchakov, R. Hosek, A. Kuptsov, L.Nemenov, A. Raimondo, V. Yazkov and P. Zrelov: Magnetic measurement report, DIRAC Note 98-06, 1998. Back
3. D. Drijard, M. Hansroul, V. Yazkov: The DIRAC Offline User Guide. Back
4. V.V. Uzhinskii: Modified code FRITIOF. User's Guide. JINR Comm., 1996,E2­96­192.
5. Gunhuyag B., Uzhinskii V.V.: Modified FRITIOF code: Negative Charged Particle Production in High Energy Nucleus­Nucleus Interactions. JINR Comm., 1996, P2­96­419.
6. M.I.Adamovich et al.: Complex analysis of gold interactions with photoemulsion nuclei at 10.7 GeV/nuclon within the framework of cascade and FRITIOF models. Z.Phys.A 358, 337­351 (1997).
7. The approximation was done by O.Gortchakov. Back
8. S. Trusov, V. Yazkov. On the event generator: utilization. Back
9. J. Saborido and P. Zrelov: New event generator for the DIRAC experiment. Under preparation. Back
10. P. Zrelov: READBUFFER code. This program can be downloded from
    

    /afs/cern.ch/user/z/zrelov/public/readbuffer/220202

    Back
11. P. Zrelov. PICASSO: Software Development Tool For The GEANT-DIRAC Simulation Program. Under Preparation. Back