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Geant 3.16 GEANT User’s Guide GEOM410 Origin : F.Bruyant, A.C.McPherson Submitted: 16.12.83 Revision : Revised: 14.12.93 Documentation : F.Carminati, M.Lefebvre Ordering the contents of a volume In the case of a mother volume containing a large number of daughters, tracking can be rather slow. This is due to the fact that each time GEANT requires to know in which daughter it is or will be tracking, it search through the whole list of daughter volumes. This is done by GEANT creating for every daughter volume a list which contain pointers to all the daughters of the same mother. Clearly this may be avoided, because at any step of tracking, the coordinates and direction cosines of the current step are known. From this and the knowledge of the geometry, a restricted list of daughter volumes to be searched can be built. This can be accomplished in GEANT in two ways, which are described in this chapter. Note: the user must be aware that the following routines alter the default search list of daughters of a given mother. A user mistake can cause wrong transport because GEANT does not make any check on the correctness of the list of neighbours provided by the user. Static ordering CALL GSNEXT (CHMOTH,IN,NLIST,LIST) CHMOTH IN NLIST LIST (CHARACTER*4) name of the mother volume to be ordered; (INTEGER) number of the content for which a list is established; (INTEGER) number of neighbours to be considered during tracking; (INTEGER) list of neighbours to volume IN. This routine stores a given ordered LIST of NLIST daughter volumes to search when leaving the IN th daughter of the mother volume CHMOTH. If IN=0, for each content, GSNEXT builds a list limited to the contents IN+1 (if it exists), IN-1 (if it exists) and IN itself. CALL GSNEAR (CHMOTH,IN,NLIST,LIST) CHMOTH IN NLIST LIST (CHARACTER*4) name of the mother volume to be ordered; (INTEGER) number of the content for which a list is established; (INTEGER) number of neighbours to be considered during tracking; (INTEGER) list of neighbours to volume IN. This routine stores a given ordered LIST of NLIST daughter volumes to search when leaving the IN th daughter of the mother volume CHMOTH. If LIST(1)=0 the particle is back into the mother when leaving the IN th daughter. This means that the IN th is not contiguous to any other daughter or to the boundary of the mother. If IN=-1, the mother does not have contents contiguous to its boundaries (status bit 4 set in mother volume bank for action in GGCLOS). If IN=0 for each content GSNEAR sets LIST(1)=0. GSNEAR must be called after all contents have been position ( except when IN=-1) 140 GEOM410 – 1
Dynamic ordering The list of neighbours to search when exiting from the IN th content may depend also on the direction and position of the particle. In case where it is necessary, for performance reasons, to exploit also this information, GEANT offers the possibility to the user to build a dynamic search list. CALL GSUNEA (CHNAME,ISEARC) CHNAME ISEARCH (CHARACTER*4) name of the volume where the user search has to be activated; (INTEGER) specifies the kind of search list to be used: a positive value must be specified with this routine to activate user search lists. This routine should be called once for every volume where user volume search is activated. CALL GUNEAR (ISEARC,ICALL,XC,JNEAR) ISEARCH ICALL XC JNEAR (INTEGER) number associated to the volume in which the user search is used, it is the same number set by the user with GSUNEA; (INTEGER) type of question that the list of volumes must answer: 1 GMEDIA-like call, where am I? 2 GTNEXT-like call, where can I go? (REAL) array of 6 containing the position and the direction cosines of the particle (x, y, z, p x /p, p y /p, p x /p); (INTEGER) pointer to the volume list bank which has to be filled by the user; The list of volumes where GEANT has to search to answer the question specified by ICALL is returned by the user starting at Q(JNEAR+1. GEANT will only look at the volumes specified by the user and in the order in which they appear in the list. Daughters are numbered from 1 to N according to the order with which they have been positioned in the mother. The list should be filled in the following way: IQ(JNEAR+1) = N, number of volumes in the list IQ(JNEAR+1+1) = number of the first daughter to search IQ(JNEAR+1+2) = number of the second daughter to search . . . IQ(JNEAR+1+N) = number of the N th daughter to search The user should be aware that this routine is called very often, almost at every tracking step, so it should be coded with the maximum efficiency in mind. An example of GUNEAR could be the following: SUBROUTINE GUNEAR(ISEARC,ICALL,XC,JNEAR) *--- Make sure to add GEANT main store +SEQ, GCBANK. DIMENSION XC(6), MYLIST(100) *--- Executable code IF(ISEARC.EQ.1) THEN *--- Build a list using XC and ISEARC for a GMEDIA type call *--- Put all the daughters where the particle may be in MYLIST(1) = .... . GEOM410 – 2 141
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CERN Program Library Long Writeup W
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Chapter 1: Catalog of Geant section
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IOPA500 KINE001 KINE100 KINE199 KIN
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Geant 3.21 GEANT User’s Guide AAA
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The routines made available for GEA
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outines, then you can type the foll
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AAAA Bibliography [1] H.J. Klein an
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2 Event simulation framework The fr
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• after each tracking step along
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GUDIGI GUOUT GTRIGC UGLAST GLAST GU
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Particles JPART Materials JMATE/JTM
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3 Summary of GEANT data records 3.1
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3.4 User applications KEY N I VAR S
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Geant 3.16 GEANT User’s Guide BAS
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SUBROUTINE UGEOM + (’TGT ’,2,
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LQ(JHEAD-1) user link IQ(JHEAD+1) I
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VALUE = GARNDM (DUMMY) DUMMY (REAL)
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1 Energy binning IDECAD Bin number
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Particle No. Mass(GeV) Charge Life
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Geant 3.16 GEANT User’s Guide DRA
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The main drawing routines are: GDRA
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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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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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1= generation of secondaries enable
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DEEMAX The formula used by GEANT is
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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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5 Processes involving Čerenkov pho
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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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2.2 Total cross-sections The integr
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POTI POTIL (REAL) average ionisatio
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VALUE = GBFSIG (T,C) GBFSIG calcula
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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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[CONS]). Usually, this is done toge
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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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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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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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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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SMULS SOMULS STMULS DPHYS3 ILABS SL
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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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