CERN Program Library Long Writeup W5013 - CERNLIB ...

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Geant 3.16 GEANT User’s Guide BASE040 Origin : Submitted: 01.10.84 Revision : Revised: 16.12.93 Documentation : F.Bruyant, M.Maire 1 Introduction Summary of Data Records GEANT uses the FFREAD [7] package to read free format data records in the routine GFFGO. The keywords accepted by GFFGO can be classified as: 1. general control of the run; 2. control of the physics processes; 3. debug and I/O operations; 4. user applications; 5. Lund event generation. The data records are listed below by category with the following information: KEY N T keyword, any number of characters truncated to the first 4 unless otherwise specified by the user; maximum expected number of variables (NVAR); type of these variables (I=INTEGER, R=REAL or M=MIXED) and for each variable in turn: •variable FORTRAN name; •short description (more detail in [ZZZZ010]); •labelled common where it is stored; •default value, usually from GINIT. When a record is decoded, the values entered by the user in free format are assigned to the variables in order. The number of values can be less than NVAR. In case of a MIXED type the values entered have agree with the type of the corresponding variable. For example the data record: RUNG 5 201 presets the run and event number to 5 and 201 respectively. None of the records mentioned below is mandatory. 2 User defined data records Before calling GFFGO the user may define private data records through calls to FFKEY as follows: CALL FFKEY(’key’,VAR(1),NVAR,’type’) They will be interpreted by GFFGO in the same way as the GEANT pre-defined records. 20 BASE040 – 1
3 Summary of GEANT data records 3.1 General control KEY N I VAR Short description COMMON GINIT HSTA 20 M LHSTA names of required standard histograms, see /GCLIST/ Blank [BASE110] OPTI 1 I IOPTI automatic optimisation of the geometry via /GCOPTI/ 1 GSORD RNDM 2 I NRNDM initial random number seed (2 words) /GCFLAG/ 0 RUNG 2 I IDRUN user run number /GCFLAG/ 1 IDEVT first user event number /GCFLAG/ 1 SORD 1 I ISTORD stack ordering flag /GCSTAK/ 0 TRIG 1 I NEVENT total number of events to process /GCFLAG/ 10000000 TIME 3 M TIMINT time left after initialisation (see Note below) /GCTIME/ TIMEND time required for termination /GCTIME/ 1 ITIME test every ITIME events /GCTIME/ 1 Note: the time allowed for the job after initialisation cannot be set by the user via the data record. To set the total time for the job the user should call the TIMEST routine at the beginning of the program before any call to GEANT routines. This variable in the data record has not been removed for backward compatibility. 3.2 Control of physics processes For more information on the use of these flags, see [PHYS001]. KEY N I VAR Short description COMMON GINIT ANNI 1 I IANNI annihilation /GCPHYS/ 1 AUTO 1 I IGAUTO automatic computation of the tracking medium /GCTRAK/ 1 parameters BREM 1 I IBREM bremsstrahlung /GCPHYS/ 1 CKOV 1 I ICKOV Čerenkov photon generation /GCTMED/ 0 COMP 1 I ICOMP Compton scattering /GCPHYS/ 1 CUTS 16 R Kinetic energy cuts in GeV: CUTGAM cut for for gammas /GCCUTS/ 0.001 CUTELE cut for electrons /GCCUTS/ 0.001 CUTNEU cut for neutral hadrons /GCCUTS/ 0.01 CUTHAD cut for charged hadrons /GCCUTS/ 0.01 CUTMUO cut for muons /GCCUTS/ 0.01 BCUTE cut for electron bremsstrahlung /GCCUTS/ GUTGAM BCUTM cut for muon and hadron bremsstrahlung /GCCUTS/ CUTGAM DCUTE cut for δ-rays by electrons /GCCUTS/ 10 4 DCUTM cut for δ-rays by muons /GCCUTS/ 10 4 PPCUTM total energy cut for direct pair production by /GCCUTS/ 0.01 muons TOFMAX time of flight cut in seconds /GCCUTS/ 10 10 GCUTS 5 user words /GCCUTS/ 0 DCAY 1 I IDCAY decay /GCPHYS/ 1 DRAY 1 I IDRAY δ-ray /GCPHYS/ 1 BASE040 – 2 21
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Page 9 and 10: The routines made available for GEA
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The main drawing routines are: GDRA
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Geant 3.21 GEANT User’s Guide DRA
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Another feature which is available
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z y x C CHARACTER*4 CHNAMS(5) INTEG
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CALL GDRAWC(’OPAL’,2,0.,10.,10.
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CALL GSATT(’HB’,’FILL’,3) C
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CALL GDRAW(’CAVE’,40.,40.,0.,10
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Figure 16: Example of use of GDSPEC
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CALL GDOPEN(3) CALL GDRAWC(’ALEF
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6 NKVIEW IVIEW JDRAW NKVIEW JV = IB
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SHAD EDGE when HIDE is ON, selects
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x1xxxx 1xxxxx add the text EVENT NR
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DRAW Bibliography [1] R.Bock et al.
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2 Volumes with contents A volume ca
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The user can position a volume thro
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0 1 2 1 0 1 0 1 2 3 4 5 6 7 Figure
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2 Divisions along arbitrary axis As
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9.BL2 half-length along x of the si
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1.DZ half-length along the z axis;
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ECAL BOX specifications 18/11/93 EC
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ECAL SPHE specifications 18/11/93 E
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Geant 3.16 GEANT User’s Guide GEO
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• if the CHONLY flag is set to MA
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y y x x y y y y z z x x z z y y x x
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CAVE PAR1 specifications 20/10/94 y
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Dynamic ordering The list of neighb
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are represented by their values. A
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Where • @302 is the block number
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GEOM Bibliography [1] French Standa
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Geant 3.16 GEANT User’s Guide HIT
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ITRA NUMBV HITS NHITS (INTEGER) is
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HITS Bibliography 175 HITS510 - 3
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0 if only IER] structures read in o
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Geant 3.16 GEANT User’s Guide IOP
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IOPA Bibliography [1] J.Zoll. ZEBRA
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Geant 3.16 GEANT User’s Guide KIN
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NTRACK ITRA JKINE NTRACK JK 1 2 3 4
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Geant 3.16 GEANT User’s Guide PHY
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Below are listed the data record ke
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Computation of total crosssection o
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7. Update the number of interaction
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1= generation of secondaries enable
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DEEMAX The formula used by GEANT is
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The second problem has been solved
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GPHYSI Initialisation of physics pr
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• the mean number of tries is not
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as function of the variable u = Eθ
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GEANT 3.16 GEANT User’s Guide PHY
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where N Z(Z i ) A(A i ) ρ σ Avoga
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Word # PHFN bank (data area, contin
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2 Method If the energy of the radia
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The Auger or Coster-Kronig transiti
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where: n number of energy bins q i
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• Case dielectric → metal. The
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| ⃗ k| = | ⃗ k ′′ | = k =
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Case dielectric → metal In this c
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5 Processes involving Čerenkov pho
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Much of the difficulty in approxima
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CALL GMOLIE (OMEGA,BETA2,DIN*) OMEG
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where λ 0 = ¯h/p Compton waveleng
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2.3 Sampling of the distribution fu
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X 0 is the radiation length. From (
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where we have set Θ=θ/χ α . To
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The variable DCUTE in common /GCCUT
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2.2 Total cross-sections The integr
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For the other charged particles the
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POTI POTIL (REAL) average ionisatio
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where φ(λ) = 1 ∫ c+i∞ exp (u
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Counts 900 800 Landau 700 40 600 20
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Fast simulation for n 3 ≥ 16 If t
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ξ/E Max (hereafter κ) relative im
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ln(∫ σ γ dE/norm.factor) -4 -6
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VALUE = GBFSIG (T,C) GBFSIG calcula
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∆σ σ = { 12 − 15% for T ≤ 1
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T(MeV) C Pb ∆El 0 ∆E l ∆σ l
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1. sample x from 1 1 ln 1 x c x set
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E bind , eV 10 5 10 20 30 40 50 60
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eV). At present the values recommen
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calculated dE dx − dE measured dx
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Figure 43: Stopping powers in Carbo
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esults can be seen in table 2 and 3
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VALUE = GBRSGM (Z,T,BCUT) Z T BCUT
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The functions F i (Z,X,Y) (i = σ,
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where, (a − 1) 1 f(ν) = ( ) 1 ν
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where: Γ = kα 2π [ ɛ = W E 1 1
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NLM DENS CORR IPART (INTEGER) numbe
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Hydrogen (bound) Sodium Copper Hydr
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[25] M. Gavrila. Relativistic l-she
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[78] R.W.Williams. Fundamental Form
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[CONS]). Usually, this is done toge
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Geant 3.16 GEANT User’s Guide TRA
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VECT,SNEXT,SAFETY Compute distance
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VECT,SNEXT,SAFETY Compute distance
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VECT,SNEXT,SAFETY Compute SFIELD,SM
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SUBROUTINE GUSTEP +SEQ,GCKING,GCVOL
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CALL GRKUTA (CHARGE,STEP,VECT,VOUT*
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Geant 3.16 GEANT User’s Guide XIN
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Clicking then on the right button o
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YMED R “ Center Y coordinate ”
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HIDE is ON, the detector can be exp
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e drawn. NAMNUM contain the arrays
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following levels (red arrows) and o
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Draw a polyline of ’npoint’ poi
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a dynamical 3-D analysis of the sim
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1. position the cursor at (uz0,vz0)
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CHUSET C “User set identifier”
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Set current attribute. 4.8 SSETVA [
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CALL GDCOL(-abs(icol)) 4.12 LWID lw
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5 GEANT/GEOMETRY Geometry commands.
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Print matrixes’ specifications. 5
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6 GEANT/CREATE It creates volumes o
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YES NO 6.7 SCONS name numed inrdw o
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7 GEANT/CONTROL Control commands. 7
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To change lout in /GCUNIT/ Note: un
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IPART I “Particle number” NAPAR
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8.5 CDIR [ chpath chopt ] CHPATH C
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9 GEANT/FZ ZEBRA/FZ commands 9.1 FZ
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Check the structure of one or more
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FACTL R “Scale factor for SL” D
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12 GEANT/PHYSICS Commands to set ph
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Possible IDRAY values are: 0 1 2 To
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12.14 PAIR [ ipair ] IPAIR C “Fla
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PPCUTM R “Cut for e+e- pairs by m
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LGET_15 C “user word” LGET_16 C
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13.6 GEOM [ lgeom˙1 lgeom˙2 lgeom
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LSTAT_7 C “user word” LSTAT_8 C
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XINT Bibliography [1] R.Brun and P.
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This common contains the threshold
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ITR3D track being scanned (used tog
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NCLAS1 NCLAS2 NCLAS3 IHOLE CGXMIN C
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* PARAMETER (MAXJMP=30) COMMON/GCJU
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GYMAX GZMIN GZMAX GXXXX GYYYY GZZZZ
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DENS density of current material in
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RADDEG radiants to degrees conversi
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PCUTNE parameterisation threshold f
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SMULS SOMULS STMULS DPHYS3 ILABS SL
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NTETA TETMIN TETMAX MODTET number o
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S2 S3 SS1 SS2 SS3 LEP IPORLI ISUBLI
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CFIELD constant for field step eval
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NEXT 1 particle has reached the bou
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C COMMON/GCVOL2/NLEVE2,NAMES2(15),N
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STEP PLIN PLOG BE2 PLASM TRNSMA BOS
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C ESHELL - Shells potentials in eV
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Geant 3.11 GEANT User’s Guide ZZZ
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GFKINE KINE001, KINE100, KINE199 GF
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GPSTAT GEOM700 GPTMED CONS001, CONS
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ZZZZ Bibliography [1] T.Sjöstrand
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CDRSGA, 297 CGMULO, 221 CHANGEWK, 3
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GEANT/DRAWING/KHITS, 372 GEANT/DRAW
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GPART, 13, 46, 61, 293 GPCXYZ, 40,
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PATCHY, 278 PCUTS, 399 PDIGI, 389 P
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