THE EGS5 CODE SYSTEM

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accumulated over the given distance, and can be specified by the parameters EFRACH and EFRACL, which correspond to the fractional energy loss over the step at the upper energy range of the problem UE and the lower energy limit AE, respectively. Thus EFRACH and EFRACL, which are set in the PEGS input file, pgs5job.pegs5inp, correspond to ESTEPE from EGS4. In the first tutor4.f example, the material in the slab is named “SI with long steps” and EFRACH and EFRACL are set to 0.30. It should be noted that these values were chosen to be artificially high (the defaults in EGS5 are 0.05 and 0.20, respectively) to help illustrate step-size dependence, since on this problem, EGS5 shows little dependence on step-size with the default values). In the second example, the material is switched to one named “SI with short steps,” and EFRACH and EFRACL are set to be 0.01 and 0.02, respectively. (Thus this example problem also illustrates a method for creating different “media” which are actually the same material with different physics options invoked.) In the third pass through tutor4.f, the first material is again used, but the step-size is selected by the specification of the characteristic dimension, CHARD. When CHARD is positive, EGS5 ignores step-sizes which correspond to EFRACH and EFRACL and instead automatically chooses values of the initial scattering strength which provide converged values for electron tracklength (to within 1% accuracy) for electrons impinging on a cylinders of diameter and thickness CHARD. For the current problem, CHARD can be taken to be equivalent to the slab thickness, as seen below. Following is the source code (except for subroutine HOWFAR, which is not changed from tutor2.f) used by tutor4.f. !*********************************************************************** ! ! ************** ! * * ! * tutor4.f * ! * * ! ************** ! ! An EGS5 user code. It lists the particles escaping from the back ! of a 2 mm Si plate when a pencil beam of 2 MeV electrons ! is incident on it normally. ! ! For SLAC-R-730/KEK Report 2005-8: A simple example which scores ! reflected, deposited, and transmitted particles and energy and ! demonstrates step-size selection ! ! The following units are used: unit 6 for output !*********************************************************************** !23456789|123456789|123456789|123456789|123456789|123456789|123456789|12 !----------------------------------------------------------------------- !------------------------------- main code ----------------------------- !----------------------------------------------------------------------- !----------------------------------------------------------------------- ! Step 1: Initialization 156
!----------------------------------------------------------------------- implicit none ! ------------ ! EGS5 COMMONs ! ------------ include ’include/egs5_h.f’ ! Main EGS "header" file include ’include/egs5_bounds.f’ include ’include/egs5_media.f’ include ’include/egs5_misc.f’ include ’include/egs5_thresh.f’ include ’include/egs5_useful.f’ include ’include/egs5_usersc.f’ include ’include/randomm.f’ ! bounds contains ecut and pcut ! media contains the array media ! misc contains med ! thresh contains ae and ap ! useful contains RM ! usersc contains emaxe common/geom/zbound real*8 zbound ! geom passes info to our howfar routine common/score/escore(3),iscore(3) real*8 escore integer iscore real*8 ein,xin,yin,zin, * uin,vin,win,wtin integer iqin,irin real*8 anorm,total real * tarray(2),tt,tt0,tt1,cputime integer loop,i,j,ncase character*24 medarr(2) ! Arguments ! Local variables real etime ! ---------- ! Open files ! ---------- open(UNIT= 6,FILE=’egs5job.out’,STATUS=’unknown’) do loop = 1,3 157
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THE EGS5 CODE SYSTEM 1 Hideo Hiraya
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Contents 1 INTRODUCTION 1 1.1 Inten
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2.15.6 Electron Step-Size Selection
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B.4.9 Output of Results (Step 9) .
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List of Figures 2.1 Program flow an
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C.4 Subprogram relationships in PEG
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B.5 Variable descriptions for COMMO
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PREFACE In the nineteen years since
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Chapter 1 INTRODUCTION 1.1 Intent o
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“shower book”. For various reas
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1.2.2 EGS1 About this time Nelson b
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MSCAT. These versions of EGS, PEGS,
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ten for energies less than 100 MeV
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- Molière multiple scattering (i.e
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EGS5. The primary advantages of thi
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ICRU37-compliant using the NIST dat
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high Z materials. Del Guerra et al.
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One of these six cross sections is
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at low energies. The latter, couple
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If E 1 and E 2 are expressions invo
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The result of this algorithm is tha
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2.4 Particle Transport Simulation T
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from appropriate distribution funct
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parameters which may be needed. The
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arrived at their values in a very m
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Math FORTRAN Program Table 2.1 (con
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Figure 2.2: Feynman diagrams for br
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defined by δ ij = 1 if i = j, 0 ot
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Davies, Bethe and Maximon[49] (e.g.
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cross section given in Equation 2.4
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and use this as the variable to be
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we have Now define δ ′ = ∆ C
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This agrees with formula (10) of Bu
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That is, using Equations 2.122 and
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d˘Σ P air, Run−time dE = [ 2 3
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Angular distribution formulas The f
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at either x = 0, x = (πE 0 ) 2 (i.
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The following table, derived from t
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Figure 2.3: Feynman diagrams for tw
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where X 0 = radiation length (cm),
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where α ′ 1 = α ′ 2 = k 0 ′
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+ 1 E 2 ′ − 1 E 1 ′ − C 2 l
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PEGS functions BHABDM, BHABRM, and
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To find the limits of E, we first c
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Figure 2.5: Feynman diagram for sin
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Ī adj = average adjusted mean ioni
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Table 2.2 (cont.) Z Symbol Atomic D
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Table 2.3 (cont.) LABEL a m s x 0 x
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(c) If 10.5 ≤ −C < 11.0 then x
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obtain the real scattering angle. E
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ρ = material mass density (g/cm 3
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Hence, so that ln [1.13 + 3.76(αZ
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g 3 (θ) = θ4 ( ) λf (0) (θ) + f
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Actually, b = 0 does not correspond
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Assume that an electron starts off
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At small path lengths t, a very lar
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x Final Direction φ Θ ∆x t Init
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shown that this version of the rand
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and as we noted earlier, they are d
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Final Direction x Energy Hinges φ
Page 121 and 122: Transport Steps, ∆ E = E x ESTEPE
Page 123 and 124: tranport step 1 DEINITIAL1 DERESID1
Page 125 and 126: = ∆E ( ∣ ∣∣∣ dE −1 ∣
Page 127 and 128: Since the CSDA range is uniquely de
Page 129 and 130: short steps accurate, but slow step
Page 131 and 132: Table 2.4: Materials used in refere
Page 133 and 134: Average Lateral Displacement (cm) 0
Page 135 and 136: 100 MeV Electrons 0.01 0.001 Li C L
Page 137 and 138: actions involving photons with ener
Page 139 and 140: Cu 40 keV Counts (/keV/sr/source) 1
Page 141 and 142: Table 2.6: Data sources for general
Page 143 and 144: 2.16.2 Photoelectron Angular Distri
Page 145 and 146: where r 0 is the classical electron
Page 147 and 148: second term on the right-hand side
Page 149 and 150: Z θ k Y O φ e 0 X k 0 Figure 2.23
Page 151 and 152: Note the similarities and differenc
Page 153 and 154: X Z ω k 0 O e 0 Y Figure 2.25: Dir
Page 155 and 156: W = Atomic, molecular and mixture w
Page 157 and 158: In order to use EGS5 to answer the
Page 159 and 160: write(6,100) 100 FORMAT(’ PEGS5-c
Page 161 and 162: ! plate is 1 mm thick !------------
Page 163 and 164: implicit none include ’include/eg
Page 165 and 166: 0.989 MeV kinetic energy Brem photo
Page 167 and 168: ! locally (in fact EDEP = particles
Page 169 and 170: inmax=max(binmax,ebin(j)) end do wr
Page 171: 0.40 0.0058 * 0.60 0.0054 * 0.80 0.
Page 175 and 176: endif if(loop.lt.3) then write(6,12
Page 177 and 178: 180 FORMAT(/’ Knock-on electrons
Page 179 and 180: common/score/escore(3), iscore(3) r
Page 181 and 182: Brem photons can be created and any
Page 183 and 184: in any combination of 31 well speci
Page 185 and 186: end do end do ! nmed and dunit defa
Page 187 and 188: ! ------------------------------ cl
Page 189 and 190: if (iarg.eq.17) then ! A Compton sc
Page 191 and 192: ! the general purpose geometry subr
Page 193 and 194: eturn end !------------------------
Page 195 and 196: open(UNIT= 6,FILE=’egs5job.out’
Page 197 and 198: write(6,130) 130 format(/’ Start
Page 199 and 200: icol= * int(dlog10(ebin(j)*10000.0/
Page 201 and 202: 0.0300 0.0000* 0.0320 0.0001* 0.034
Page 203 and 204: 0.0780 0.0014 * 0.0800 0.0012 * 0.0
Page 205 and 206: The main purpose of this section, h
Page 207 and 208: 4.1.3 Leading Particle Biasing The
Page 209 and 210: • Sum the weighted energy deposit
Page 211 and 212: 4 z 6 Vac 11 5 Pb 6 5 Air 7 4 9 10
Page 213 and 214: Figure 4.3: UCBEND simulation at 3.
Page 215 and 216: necessary geometry input. The follo
Page 217 and 218: Appendix A EGS5 FLOW DIAGRAMS Hideo
Page 219 and 220: subroutine annih Version 051219-143
Page 221 and 222: ¡ eq 1 anormr = 1./sqrt(anorm2) si
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1 br = max(br,0.D0) ekse2 = br*ekin
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1 2 3 br = br*p esg = eie*br yes es
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¤ ne ¤ ne subroutine collis (lele
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¦ ne ¦ ne call ausgab(iarg) 6 iq(
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subroutine compt Version 051219-143
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3 4 5 6 icprof(medium) .eq. 3 no ye
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subroutine counters_out Version 051
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1 2 3 4 5 6 7 no ii .ne. jj yes no
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© ne 1 2 3 neispl = (2*neispl + 1)
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subroutine electr(ircode) ielectr =
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7 8 9 10 11 12 13 detot = e(np)-ecu
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2324 25 26 27 28 29 30 ustep .gt. d
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4142 43 44 45 46 47 48 49 ecut(irne
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5859 60 61 62 63 64 tmscat .eq. 0.0
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73 74 75 76 no edep .lt. e(np) yes
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subroutine hardx (charge,kEnergy,ke
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1 2 3 4 5 iz = izz iz .eq. 0 no xsi
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13 14 15 16 17 sint .ne. 0. yes rde
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19 im=1 im=im+1 im >nmed no yes no
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22 23 write(kmpo,1610) read(kmpi,12
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26 27 28 iprofm(im) .ne. 1 no yes w
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30 31 32 33 34 esig0(i,im) = esig0(
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36 37 38 no iedgfl(ii).ne.0 .or. ia
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no kaug .eq. 6 call lshell(3) kaug.
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subroutine kxray Version 051219-143
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1 2 3 dfl3aug(5,iz) .eq. 0. no naug
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1 2 3 4 rnnow .le. omegal2(iz) + f2
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1 2 dflx3(6,iz) .eq. 0. no nxray=nx
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1 impacr(ir(np)).eq.1 .and. iedgfl(
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1 2 fject = (ktot - k1grd(iprt,ik1)
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5 6 7 8 9 thr = 1./eta "Central cor
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1 2 3 delta = delcm(medium)*del "Re
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8 9 10 11 12 galpha .ge. 0.0 yes no
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subroutine photo Version 051219-143
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4 5 6 7 8 rnnow .le. pbran(i) no ye
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12 13 14 beta = sqrt((eelec - RM)*(
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subroutine photon Version 051219-14
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6 7 8 9 10 idisc .gt. 0 yes no edep
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17 18 19 20 21 iausfl(iarg+1) ne 0
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27 28 iausfl(iarg+1) ne 0 no ircod
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subroutine rk1 Version 060313-0945
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4 5 6 j=1 j=j+1 j>neke-1 no yes j .
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18 19 20 21 22 23 elkeold = elke k1
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1 2 "end of file; go to 13" read(17
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4 5 "go to 30" no abs(k1mine-k1grd(
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7 8 read(17,'(72a1)') buffer read(1
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subroutine shower (iqi,ei,xi,yi,zi,
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subroutine uphi(ientry,lvl) Version
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subroutine randomset(rndum) Version
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subroutine rluxinit Version 051219-
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1 i=1 i=i+1 i>24 no yes seeds(i) =
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subroutine rluxin Version 051219-14
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Appendix B EGS5 USER MANUAL Hideo H
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Table B.1: Variable descriptions fo
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Table B.12: Variable descriptions f
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Optional parameter modifications Th
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the call to PEGS5 may be skipped if
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egions. Execution of EGS5 is termin
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of the transport in the walls of el
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call rluxinit after specifying LUXL
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END OF FILE ON UNIT 12 PROGRAM STOP
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do i=1,ncases uf(1)=ufi vf(1)=vfi w
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crossed, then USTEP should be set t
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subroutine howfar implicit none inc
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Table B.18: IARG values program sta
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As an example of how to write an AU
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!**********************************
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nreg=3 do i=2,nreg ecut(i)=100.0 pc
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nlines=0 nwrite=15 !---------------
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if (nlines.lt.nwrite) then write(6,
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Appendix C PEGS USER MANUAL Hideo H
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is entered. On each pass through th
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(from previous figure) (to previous
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(from previous figure) | | + ------
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+------+ |BREMTR| +------+ | V +---
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+------+ |PAIRTR| +------+ | V +---
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Name DCSLOAD DCSSTOR DCSTAB ELASTIN
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Name AFFACT AINTP ALKE ALKEI ALIN A
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Table C.5: Functions in PEGS, part
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+------+ +------+ +------+ +------+
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Table C.8: ELEM option input data l
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Table C.10: MIXT option input data
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Table C.12: PWLF option input data
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Table C.17: PLTN option input data
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ICPROF is set to 3, the user must c
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Column Line 12345678911234567892123
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interiors of the intervals. If FEXA
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C.3.6 The TEST Option The TEST opti
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C.3.9 The HPLT Option The Histogram
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Appendix D EGS5 INSTALLATION GUIDE
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egs5 directory (preferably using th
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6. The user is then asked to key-in
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* User code tutor1.f has been compi
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Appendix E CONTENTS OF THE EGS5 DIS
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All of the actual FORTRAN source co
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aprime.data Data for empirical brem
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eryllium iron silicon bismuth krypt
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The tutorial problems and advanced
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Bibliography [1] R. G. Alsmiller Jr
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[28] A. F. Bielajew. HOWFAR and HOW
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[59] K. Flöttmann. Investigations
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[92] H. Kolbenstvedt. Simple theory
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[123] Y. Namito, H. Hirayama, A. Ta
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[156] Y. A. Shreider, editor. The M
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Index “shower book”, 37 AE, 28,
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Klein-Nishina formula, 62 Landau di
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THE EGS5 CODE SYSTEM

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