CERN Program Library Long Writeup W5013 - CERNLIB ...

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1. Evaluate the stopping range for the threshold energy (STOPC). This was done only once at the beginning of each new track. 2. From the energy of the particle derive the stopping range by a linear interpolation of the range table: R 0 = GEKRT1 × R i + GEKRAT × R i+1 where E i
The second problem has been solved by changing the interpolation algorithm, going from a linear to a quadratic interpolation. Instead of assuming a linear relation between energy and stopping range in every energy bin, we assume a quadratic relation of the sort: E = f(R) =aR 2 +bR +c The only problem now is the determination of the coefficients a, b and c. To do this we recall that the general formula of the parabola which passes through the points (x 1 ,y 1 ), (x 2 ,y 2 ), (x 3 ,y 3 ) is the following: y = (x − x 2)(x − x 3 ) (x 1 − x 2 )(x 1 − x 3 ) y 1 + (x − x 1)(x − x 3 ) (x 2 − x 1 )(x 2 − x 3 ) y 2 + (x − x 1)(x − x 2 ) (x 3 − x 1 )(x 3 − x 2 ) y 3 ( ) = x 2 y 1 (x 1 − x 2 )(x 1 − x 3 ) + y 2 (x 2 − x 1 )(x 2 − x 3 ) + y 3 − (x 3 − x 1 )(x 3 − x 2 ) ( ) y 1 (x 2 + x 3 ) x (x 1 − x 2 )(x 1 − x 3 ) + y 2 (x 1 + x 3 ) (x 2 − x 1 )(x 2 − x 3 ) + y 3 (x 1 + x 2 ) + (x 3 − x 1 )(x 3 − x 2 ) ( ) y 1 x 2 x 3 (x 1 − x 2 )(x 1 − x 3 ) + y 2 x 1 x 3 (x 2 − x 1 )(x 2 − x 3 ) + y 3 x 1 x 2 (x 3 − x 1 )(x 3 − x 2 ) This allows us to calculate and tabulate the coefficients a, b and c just by replacing y i by ELOW(I) and x i by the corresponding stopping range ELOW(i). In the routine GRANGI a table of length 3 × (NEKBIN − 1) is created: Q(JINTRP+3*(I-1)+1) = a(R I , R I+1 , R I+2 , E I , E I+1 , E I+2 ) = A I +2) = 0.5 b(R I, R I+1 , R I+2 , E I , E I+1 , E I+2 ) a(R I , R I+1 , R I+2 , E I , E I+1 , E I+2 ) +3) = c(R I , R I+1 , R I+2 , E I , E I+1 , E I+2 ) a(R I , R I+1 , R I+2 , E I , E I+1 , E I+2 ) = B I = C I where E I = ELOW(I) and R I = R(ELOW(I)). The calculation of the energy loss is now done in the following steps: 1. Evaluate the stopping range for the threshold energy (STOPC), only once at the beginning of each new particle tracking. 2. From the energy of the particle derive the stopping range by a quadratic interpolation of the range table: √ R 0 = −B I + A ( I B 2 I − C I − E ) 0 |A I | A I The value of I is chosen according to the following. Let i be such that ELOW(i)
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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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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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2 Volumes with contents A volume ca
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The user can position a volume thro
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0 1 2 1 0 1 0 1 2 3 4 5 6 7 Figure
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2 Divisions along arbitrary axis As
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9.BL2 half-length along x of the si
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1.DZ half-length along the z axis;
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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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• if the CHONLY flag is set to MA
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y y x x y y y y z z x x z z y y x x
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CAVE PAR1 specifications 20/10/94 y
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Dynamic ordering The list of neighb
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are represented by their values. A
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Where • @302 is the block number
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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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Geant 3.16 GEANT User’s Guide PHY
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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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T(MeV) C Pb ∆El 0 ∆E l ∆σ l
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1. sample x from 1 1 ln 1 x c x set
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E bind , eV 10 5 10 20 30 40 50 60
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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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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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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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GPART, 13, 46, 61, 293 GPCXYZ, 40,
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PATCHY, 278 PCUTS, 399 PDIGI, 389 P
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