CERN Program Library Long Writeup W5013 - CERNLIB ...

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Geant 3.16 GEANT User’s Guide DRAW300 Origin : R.Brun, P.Zanarini Submitted: 01.10.83 Revision : S.Giani Revised: 13.12.93 Documentation : P.Zanarini, S.Giani, F.Carminati 1 The view banks Handling View banks The basic detector drawing routines (GDRAW, GDRAWC, GDRAWX) scan the data structure JVOLUM repeatedly to extract position and dimension information on the volumes. This can be a rather lengthy process even on fast computer. Hidden line removal drawing requires an auxiliary data structure and the relative visibility of all the volumes has to be analysed. With complicated detectors the time spent in this process can be substantial, depending on the drawing options chosen and on the speed of the machine on which the program is run. In order to alleviate this problem the graphic banks and the associated routines have been developed. The interpretation of the structure (for instance scanning of the volumes’ data structure to convert the 3D geometry structure into a set of 2D lines, visibility analysis, surface creation or light processing) is thus separate from the drawing itself. In this way, the interpretation is performed only once and all the 2D information is stored in view banks (data structure JDRAW [DRAW399]). These views can then be displayed quickly, having only to draw the 2D vectors or the fill areas previously stored. For a detector with more than 100 different volumes, for example, this costs only a few thousand words of memory for each drawing stored. If the drawing routines are called while a view bank, identified by a positive integer, is open (GDOPEN) only interpretation will be made, no output will be generated until the bank is closed (GDCLOS). When a view bank has been closed it cannot be modified, but it can be displayed as many times as wanted (GDSHOW) or deleted (GDELET). Once a drawing (detectors, tracks or hits) is in a view bank, it is possible to scan it in detail via the LENS or ZOOM interactive commands (only available with X11). For more information see the [XINT] section. CALL GDOPEN (IVIEW) IVIEW (INTEGER) view bank number (IVIEW>0). Opens a view bank, used to store 2D graphics information coming from the interpretation of 3D structures (but also 2D annotation). All subsequent calls to the drawing routines will fill the view bank IVIEW, without generating any output. CALL GDCLOS Closes the current opened view bank. Once a view bank has been closed no more drawing can be added to it. A call to GDCLOS also restores the screen. CALL GDSHOW (IVIEW) IVIEW (INTEGER) view bank number (IVIEW>0). Displays view bank IVIEW. GDSHOW can be called either before or after a view bank has been closed. If a view bank is currently open, the content of bank IVIEW will be added to it. 92 DRAW300 – 1
CALL GDOPEN(3) CALL GDRAWC(’ALEF’,2,5.,10.,10.,0.013,0.013) CALL GDCLOS CALL GDSHOW(3) . . CALL GDXYZ(0) Figure 17: Example of use of view banks CALL GDELET (IVIEW) IVIEW (INTEGER) view bank number (IVIEW>0). Deletes a view bank from memory. If called before a bank has been closed, GDELET will also restore the screen mode. Note: the JDRAW data structure has a top level bank which contains one word for each view bank in Q(JDRAW+IVIEW). This word is a key which determines the status of the bank. If this key is 3, the bank itself is protected against deletion, and it cannot be deleted by GDELET. An example of use of view banks is shown in Fig. 17. DRAW300 – 2 93
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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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Page 73 and 74: The main drawing routines are: GDRA
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Page 87 and 88: CALL GDRAW(’CAVE’,40.,40.,0.,10
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Page 97 and 98: 6 NKVIEW IVIEW JDRAW NKVIEW JV = IB
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Page 103 and 104: DRAW Bibliography [1] R.Bock et al.
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Geant 3.16 GEANT User’s Guide GEO
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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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Geant 3.16 GEANT User’s Guide IOP
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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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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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