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Geant 3.16 GEANT User’s Guide GEOM300 Origin : R.Brun, A.C.McPherson, F.Bruyant Submitted: 18.12.83 Revision : S.Giani Revised: 14.12.93 Documentation : Finding in which volume a point is CALL GMEDIA (X,NUMED*) X NUMED (REAL) array of dimension 3 with the coordinates in the MRS; (INTEGER) medium number, if this is zero the point is outside the detector. Searches the geometrical tree structure to find in which volume the point X is. The tracking medium is returned in NUMED, and the common /GCVOLU/ is updated. GMEDIA uses the geometry data structure to conduct its search starting its search from the last volume where a point was found. If no previous search has been conducted, the first volume is used as a starting point. If the point is not inside the current volume, GMEDIA looks in its mother and so on, until it finds a volume which contains the point. It then looks at the contents of this object and so on until the point is in a volume but in none of its contents (if any). If this downward search terminates in a ’MANY’ object, GMEDIA looks for another candidate. See [GEOM110] for a description of the ‘MANY’ volumes tratment. The physical geometrical tree from the first volume to the current one is stored in the common block GCVOLU (see [BASE030]) and in the structure JGPAR (see [GEOM199]). CALL GTMEDI (X,NUMED*) X NUMED (REAL) array of dimension 3 with the coordinates in the MRS; (INTEGER) medium number, if this is zero the point is outside the detector. This routine performs the same function than GMEDIA, but it uses the dynamical information of the particle history to speed-up the search: • when INWVOL=2 (common /GCTRAK/) the particle just came out of a volume. In this case, if INFROM (common /GCVOLU/) is positive, it is interpreted by GTMEDI as the number IN of the content just left, inside the mother volume where the point X is assumed to be. This content will not be searched again. • the daughter of the current volume which limits the geometrical step of the particle (i.e. where the particle would be heading moving along a straight line) is searched first. INGOTO (common /GCVOLU/) is set by GTNEXT, to transmit the information on this one volume which has limited the geometrical step SNEXT as follows: >0 IN th content; =0 current volume;
Geant 3.21 GEANT User’s Guide GEOM310 Origin : R.Brun, A.C.McPherson Submitted: 01.06.83 Revision : S.Giani Revised: 15.12.93 Documentation : Finding distance to next boundary CALL GNEXT (X,SNEXT*,SAFETY*) CALL GTNEXT (X,SNEXT*,SAFETY*) Finds distance to the next boundary. It takes explicit account of shape content and uniqueness. X SNEXT SAFETY (REAL) array of 6 of coordinates and direction cosines; (REAL) distance to the nearest volume boundary along the particle direction; (REAL) safety distance, that is smaller distance to any boundary; This routine evaluates the two distances which are needed by the GEANT tracking routines. GTNEXT and GNEXT perform the same function, but GNEXT is a static routine which can be called by the user, while GTNEXT is the routines used internally by GEANT during tracking, and it should not be called by the user. If INFROM (common /GCVOLU/) is different from 0, GTNEXT interprets it as the daughter out of which the particle just came, and uses the list of daughters stored with that volume, possibly modified by GSNEXT/GSNEAR to calculate the distance to the next boundary. The first action of GTNEXT is to calculate the SAFETY distance. If this is larger than the current step candidate, no other calculation is performed and the IGNEXT flag (common /GCTRAK/) is set to 0, indicating that no change of volume is occurring at the end of the current step. If the step is smaller than safety, then SNEXT is computed. If the step is smaller than SNEXT, again there will not be any change of volume during the step and IGNEXT is set to 0. If on the contrary the candidate step is larger than SNEXT, a change of volume will occur at the end of the step, and IGNEXT is set to 1 and INGOTO (common /GCTRAK/) is set to the number of the daughter where the particle is entering, if any. Charged particles in magnetic field are transported with a similar logic. However, even if the candidate step is smaller than SNEXT, the particle can still cross into another volume due to its bent path. When tracking in magnetic field, after every step greater than SAFETY it is checked whether the particle is still in the same volume. If this is not the case, the step is divided by two and transport is tried again. Conversely a charged particle in magnetic field may still be in the current volume even after having travelled the distance to the nearest boundary along a straight line. So boundary crossing is declared only when IGNEXT is different from 0 and the difference between the real trajectory and the bent one is smaller than EPSIL (common /GCTMED/). 137 GEOM310 – 1
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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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Geant 3.16 GEANT User’s Guide CON
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1 Energy binning IDECAD Bin number
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Particle No. Mass(GeV) Charge Life
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¯Ω + ¯Ξ 0 π + 23.60 ¯ΛK + 67
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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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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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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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Counts 900 800 Landau 700 40 600 20
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Fast simulation for n 3 ≥ 16 If t
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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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eV). At present the values recommen
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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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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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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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9 GEANT/FZ ZEBRA/FZ commands 9.1 FZ
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Check the structure of one or more
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12 GEANT/PHYSICS Commands to set ph
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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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GYMAX GZMIN GZMAX GXXXX GYYYY GZZZZ
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PCUTNE parameterisation threshold f
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C COMMON/GCVOL2/NLEVE2,NAMES2(15),N
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C ESHELL - Shells potentials in eV
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GFKINE KINE001, KINE100, KINE199 GF
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GPSTAT GEOM700 GPTMED CONS001, CONS
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CDRSGA, 297 CGMULO, 221 CHANGEWK, 3
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