CERN Program Library Long Writeup W5013 - CERNLIB ...

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ISYNC = 1 VECT ✲ New ✲ direction ✲ ✲ of e Photons STEP ✟ ✟✟✟✟✟✟✟ Current step ISYNC = 3 VECT New ✲ direction of e ✟ ♣ ✟✟✟✟✟✟✟ ♣ ♣ ♣ ♣ ♣ ♣ ♣ ♣ ♣ ♣ ♣ ♣ ♣ ♣ Photons ✟✯ ✏✶ ✚❃ STEP ✒ Current step Figure 42: The point where the synchrotron radiation photon is generated. The figure on the left describes the situation when ISYNC = 1, and the one on the right when ISYNC = 3. The little arrows are the photons and STEP is the step taken by the e − or e + . VECT is the new direction computed in GTELEC before entering in GSYNC. where p is the momentum of the particle in GeV. B is in tesla and ρ is in meters. Knowing the step length, the energy of the electron and the curvature of the particle track in the magnetic field, the number of photons in a step δx can be sampled from a Poissonian distribution around the mean value n δx =0.01053 γ δx (6) ρ Now, the energies of n δx photons have to be determined. The energy distribution in a step follows the distribution [81] f(ε) = dN dε ∫ ∞ ∝ K 5/3 (x) dx (7) ε/ε c The energy can be sampled from this by inverse transform method: N = F (ε) = ∫ f(ε) dε (8) ε = F −1 (N) (9) The double integral is not analytically solved, and the sampling is done from tabulated values of numerically computes F (ε). Two methods have been implemented. If the flag ISYNC is set to 1, the photons are emitted at the end of the step along the current direction. If ISYNC is set to 3, the photons are emitted randomly along the tangent the real trajectory of the particle. In the case when ISYNC = 3, the magnetic field tracking routines are called for each photon, and therefore this option is considrably slower than ISYNC = 1. PHYS360 – 2 292
Geant 3.16 GEANT User’s Guide PHYS400 Origin : G.N.Patrick Submitted: 30.03.82 Revision : Revised: 16.12.93 Documentation : Simulation of particle decays in flight 1 Subroutines CALL GDECAY GDECAY is the control routine for the simulation of particle decays in flight. For a given parent particle it selects from a list a two- or three-body decay mode using the known branching ratios and calls the routines needed to generate the vertex and secondary tracks. It used the following input and output: input: output: via common blocks /GCTRAK/ and /GCKINE/ via common block /GCKING/ GDECAY is called by the tracking routines. It calls the subroutines GDECA2 for two-body decay, GDECA3 for three-body decay, GLOREN for Lorentz transformation and GDROT for rotation. For the documentation of GLOREN and GDROT, see [PHYS410]. CALL GDECA2 (XM0,XM1,XM2,PCM) XM0 XM1 XM2 PCM(3,4) (REAL) mass of the parent particle (REAL) mass of the first decay product (REAL) mass of the second decay product (REAL) array containing the four-vectors of the decay products GDECA2 simulates the two-body decay with isotropic angular distribution in the center-of-mass system. It is called from GDECAY. CALL GDECA3 (XM0,XM1,XM2,XM3,PCM) XM0 XM1 XM2 XM3 PCM(3,4) (REAL) mass of the parent particle (REAL) mass of the first decay product (REAL) mass of the second decay product (REAL) mass of the third decay product (REAL) array containing the four-vectors of the decay products GDECA3 simulates the three-body decay with isotropic angular distribution in the center-of-mass system. It is called from GDECAY. 293 PHYS400 – 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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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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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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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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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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HITS Bibliography 175 HITS510 - 3
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NTRACK ITRA JKINE NTRACK JK 1 2 3 4
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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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GEANT 3.16 GEANT User’s Guide PHY
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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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YMED R “ Center Y coordinate ”
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following levels (red arrows) and o
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Draw a polyline of ’npoint’ poi
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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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Print matrixes’ specifications. 5
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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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This common contains the threshold
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