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| 2 | SUBROUTINE GUTRAK
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| 3 | *
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| 4 | * User routine to control tracking of one track
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| 5 | * Called by : GTREVE
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| 6 | *
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| 7 | #include "geant321/gckine.inc"
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| 8 | #include "geant321/gconst.inc"
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| 9 | #include "geant321/gctrak.inc"
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| 10 | *
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| 11 | #include "geomate.inc"
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| 12 | #include "runinfo.inc"
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| 13 | #include "histo.inc"
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| 14 | *
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| 15 | logical transmit, reflect, charged, neutral
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| 16 | *
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| 17 | * *** beginning of the track
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| 18 | *
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| 19 | charged = (charge.ne.0.)
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| 20 | neutral = .not.charged
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| 21 | *
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| 22 | kflag = 0
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| 23 | if (charge.eq.pkine(10)) kflag = 1
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| 24 | if ((itra.eq.1).and.(istak.eq.0)) kflag = 2
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| 25 | *
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| 26 | * *** perform tracking
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| 27 | *
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| 28 | CALL GTRACK
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| 29 | *
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| 30 | * *** end of the track
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| 31 | *
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| 32 | transmit = (vect(1).ge. 0.49*xworld)
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| 33 | reflect = (vect(1).le.-0.49*xworld)
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| 34 | *
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| 35 | if (transmit) itransmi = max(itransmi,kflag)
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| 36 | if (reflect) ireflect = max(ireflect,kflag)
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| 37 | *
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| 38 | * *** histograms
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| 39 | *
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| 40 | id = 0
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| 41 | *
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| 42 | * energy spectrum at exit
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| 43 | *
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| 44 | if (transmit.and.charged) id = 10
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| 45 | if (transmit.and.neutral) id = 20
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| 46 | if (reflect .and.charged) id = 30
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| 47 | if (reflect .and.neutral) id = 40
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| 48 | if (id.ne.0.and.histo(id)) then
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| 49 | call hfill (id,gekin/histUnit(id),0.,1.)
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| 50 | endif
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| 51 | *
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| 52 | * space angle distribution at exit
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| 53 | *
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| 54 | if (transmit.and.charged) id = 12
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| 55 | if (transmit.and.neutral) id = 22
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| 56 | if (reflect .and.charged) id = 32
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| 57 | if (reflect .and.neutral) id = 42
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| 58 | if (id.ne.0.and.histo(id)) then
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| 59 | unit = histUnit(id)
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| 60 | theta = acos(abs(vect(4)))
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| 61 | dteta = binWidth(id)*unit
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| 62 | dOmega = twopi*sin(theta)*dteta
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| 63 | weight = 0.
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| 64 | if (dOmega.gt.(1./big)) weight = 1./dOmega
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| 65 | call hfill (id,theta/unit,0.,weight*unit*unit)
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| 66 | endif
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| 67 | *
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| 68 | * projected angle distribution at exit
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| 69 | *
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| 70 | if (transmit.and.charged) id = 13
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| 71 | if (transmit.and.neutral) id = 23
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| 72 | if (reflect .and.charged) id = 33
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| 73 | if (reflect .and.neutral) id = 43
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| 74 | if (id.ne.0.and.histo(id)) then
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| 75 | thety = atan(vect(5)/abs(vect(4)))
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| 76 | thetz = atan(vect(6)/abs(vect(4)))
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| 77 | call hfill (id,thety/histUnit(id),0.,1.)
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| 78 | call hfill (id,thetz/histUnit(id),0.,1.)
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| 79 | endif
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| 80 | *
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| 81 | * projected position at exit
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| 82 | *
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| 83 | if (transmit.and.charged) id = 14
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| 84 | if (id.ne.0.and.histo(id)) then
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| 85 | call hfill (id,vect(2)/histUnit(id),0.,1.)
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| 86 | call hfill (id,vect(3)/histUnit(id),0.,1.)
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| 87 | endif
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| 88 | *
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| 89 | END
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