CERN Program Library Long Writeup W5013 - CERNLIB ...

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CALL GFTMED (ITMED,NATMED*,NMAT*,ISVOL*,IFIELD*,FIELDM*,TMAXFD*, STEMAX*,DEEMAX*,EPSIL*,STMIN*,UBUF*,NWBUF*) Extracts the parameters of the tracking medium ITMED from the data structure JTMED. CALL GPTMED (ITMED) Prints the tracking medium parameters for the given medium. ITMED (INTEGER) tracking medium to be printed, all tracking media if ITMED=0. Automatic calculation of the tracking parameters The results of the simulation depend critically on the choice of the tracking medium parameters. To make of GEANT a reliable and consistent predictive tool, the calculation of these parameters has been automated. In a normal GEANT run, the variable IGAUTO in common /GCTRAK/ is set to 1. In this case the following parameters are calculated by the program: { 20 ◦ if TMAXFD ≤ 0 or TMAXFD > 20 TMAXFD = input value if 0 < TMAXFD ≤ 20 STEMAX = BIG(= 10 10 ) ⎧ ⎪⎨ 0.25 if ISVOL =0and X 0 ≤ 2cm, where X 0 is the radiation length of DEEMAX = the material ⎪⎩ 0.25 − √ 0.2 otherwise X0 ⎧ 2R ⎪⎨ √ if ISVOL =0 STMIN = X0 5R ⎪⎩ √ if ISVOL ≠0 X0 where R is the range in cm of an electron of energy CUTELE+200keV. If the IGAUTO variable is set to 0 via the AUTO data record, then value given by the user for the above parameters is accepted as the true parameter value if > 0, while automatic calculation still takes place in case the input value is negative. Users are strongly recommended to begin their simulation with the parameters as calculated by GEANT. Users who want to modify any of the above parameters must be sure they understand their function in the program and the implications of a change. The EPSIL parameter represents the absolute precision with which the tracking is performed. It has a double meaning. When tracking in magnetic field, EPSIL is the minimum distance for which boundaries are checked. A particle nearer than EPSIL to the boundary is considered as exiting the current volume. If the end point of the step of a particle in magnetic field is distant less than EPSIL along each axis from what would be the end point in absence of magnetic field, then no boundary checking is performed. In all cases, when a particle is going to reach the boundary of the current volume with the current step, the step length is increased by a quantity (PREC, common /GCTMED/) which is set to the minimum between 0.1 × EPSIL and 10 micron at the beginning of the tracking. This quantity is recalculated at every step according to the formula: [ ( ) ] EPSIL PREC =max min 10 , 10µ , max [|x|, |y|, |z|,S) × ɛ (1) Where x, y, z are the current coordinates of the particle, S is the length of the track, and ɛ is the assumed machine precision. ɛ (called EPSMAC in the program) is initially set to 10 −6 for 32 bits machines and 10 −11 for 64 bits machines. During the tracking, every fifth time that a particle tries unsuccessfully to exit from the same volume, the machine precision is multiplied by the number of trials. This accounts for additional losses of precision due to transformation of coordinates and region of the floating point range where the real machine precision is different from the above (this happens in particular on IBM mainframes with 370 floating point number representation). CONS200 – 2 58
Geant 3.16 GEANT User’s Guide CONS210 Origin : R.Brun,F.Bruyant Submitted: 11.02.86 Revision : Revised: 08.12.93 Documentation : same Special Tracking Parameters CALL GSTPAR (ITMED,CHPAR,PARVAL) ITMED CHPAR PARVAL (INTEGER) tracking medium number; (CHARACTER*4) character string, name of the variable to be modified; (REAL) new value (must be given as a floating point). Default parameters Parameter name Default value Q(JTMN +1) = CUTGAM CUTGAM 0.001GeV Q(JTMN +2) = CUTELE CUTELE 0.001GeV Q(JTMN +3) = CUTNEU CUTNEU 0.01GeV Q(JTMN +4) = CUTHAD CUTHAD 0.01GeV Q(JTMN +5) = CUTMUO CUTMUO 0.01GeV Q(JTMN +6) = BCUTE BCUTE CUTGAM Q(JTMN +7) = BCUTM BCUTM CUTGAM Q(JTMN +8) = DCUTE DCUTE 10.TeV Q(JTMN +9) = DCUTM DCUTM 10.TeV Q(JTMN+10) = PPCUTM PPCUTM 0.01GeV Q(JTMN+11) = IPAIR PAIR 1 Q(JTMN+12) = ICOMP COMP 1 Q(JTMN+13) = IPHOT PHOT 1 Q(JTMN+14) = IPFIS PFIS 0 Q(JTMN+15) = IDRAY DRAY 2 Q(JTMN+16) = IANNI ANNI 1 Q(JTMN+17) = IBREM BREM 1 Q(JTMN+18) = IHADR HADR 1 Q(JTMN+19) = IMUNU MUNU 0 Q(JTMN+20) = IDCAY DCAY 1 Q(JTMN+21) = ILOSS LOSS 2 Q(JTMN+22) = IMULS MULS 1 Q(JTMN+26) = GHEISHA GHCOR1 see [PHYS700] Q(JTMN+27) = MODEL BIRK1 see [PHYS337] Q(JTMN+28) = RKB BIRK2 see [PHYS337] Q(JTMN+29) = C BIRK3 see [PHYS337] Q(JTMN+31) = ILABS LABS see [PHYS260] Q(JTMN+32) = ISYNC SYNC see [PHYS360] Q(JTMN+33) = ISTRA STRA see [PHYS333] The data structure JTMED contains the standard tracking parameters (CUTS and flags to control the physics processes) which are used by default for all tracking media. It is possible to redefine individually with 59 CONS210 – 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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2 Divisions along arbitrary axis As
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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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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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1= generation of secondaries enable
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DEEMAX The formula used by GEANT is
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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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where N Z(Z i ) A(A i ) ρ σ Avoga
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2 Method If the energy of the radia
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• Case dielectric → metal. The
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| ⃗ k| = | ⃗ k ′′ | = k =
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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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2.2 Total cross-sections The integr
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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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calculated dE dx − dE measured dx
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Figure 43: Stopping powers in Carbo
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VALUE = GBRSGM (Z,T,BCUT) Z T BCUT
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where, (a − 1) 1 f(ν) = ( ) 1 ν
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Hydrogen (bound) Sodium Copper Hydr
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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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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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YES NO 6.7 SCONS name numed inrdw o
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To change lout in /GCUNIT/ Note: un
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8.5 CDIR [ chpath chopt ] CHPATH C
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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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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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GYMAX GZMIN GZMAX GXXXX GYYYY GZZZZ
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NEXT 1 particle has reached the bou
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