| 1 | SUBROUTINE HOWFAR
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| 2 | C
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| 3 | C*********************************************************************
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| 4 | C DESIGN : D. HECK IK3 FZK KARLSRUHE
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| 5 | C DATE : SEP 05, 1988
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| 6 | C*********************************************************************
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| 7 | C THE FOLLOWING IS A GENERAL SPECIFICATION OF HOWFAR:
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| 8 | C GIVEN A PARTICLE AT (X,Y,Z) IN REGION IR AND GOING IN DIRECTION
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| 9 | C (U,V,W), THIS ROUTINE ANSWERS THE QUESTION, CAN THE PARTICLE GO
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| 10 | C A DISTANCE USTEP WITHOUT CROSSING A BOUNDARY OR OBSERVATION LEVEL?
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| 11 | C IF YES, IT CALCULATES DNEAR AND RETURNS.
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| 12 | C IF NO, IT SETS USTEP=DISTANCE TO BOUNDARY OR DETECTOR IN
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| 13 | C IN THE CURRENT DIRECTION.
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| 14 | C IT SETS IRNEW TO THE REGION NUMBER ON THE FAR SIDE
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| 15 | C OF THE BOUNDARY (THIS CAN BE MESSY IN GENERAL!);
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| 16 | C IT SETS NEWOBS TO THE DETECTOR NUMBER NEXT AFTER THE
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| 17 | C DETECTOR JUST PASSING.
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| 18 | C THE USER CAN TERMINATE A HISTORY BY SETTING IDISC>0. THE USER
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| 19 | C CAN TRANSPORT THE LAST PARTICLE BY SETTING IDISC<0. HERE WE
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| 20 | C TERMINATE ALL HISTORIES WHICH ENTER REGION 6 OR ARE GOING
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| 21 | C BACKWARDS IN REGION 1 OR HAVE PASSED THE LAST OBSERVATION LEVEL.
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| 22 | C*********************************************************************
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| 23 | C ELECTRON OR PHOTON POSITIVE Z-DIRECTION (W>0) IS DOWNWARDS
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| 24 | C |
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| 25 | C | REGION 1 (VACUUM)
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| 26 | C V
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| 27 | C--------------------------- STARTING PLANE AT -BOUND(1) = -ZALTIT
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| 28 | C
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| 29 | C REGION 2 (AIR WITH EXPONENTIALLY
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| 30 | C INCREASING DENSITY)
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| 31 | C
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| 32 | C--------------------------- BOUNDARY AT -BOUND(2)
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| 33 | C
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| 34 | C REGION 3 (AIR WITH EXPONENTIALLY
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| 35 | C INCREASING DENSITY)
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| 36 | C
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| 37 | C--------------------------- BOUNDARY AT -BOUND(3)
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| 38 | C
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| 39 | C REGION 4 (AIR WITH EXPONENTIALLY
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| 40 | C INCREASING DENSITY)
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| 41 | C
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| 42 | C--------------------------- BOUNDARY AT -BOUND(4)
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| 43 | C
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| 44 | C REGION 5 (AIR WITH EXPONENTIALLY
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| 45 | C INCREASING DENSITY)
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| 46 | C
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| 47 | C-------------------------Z=0 BOUNDARY AT -BOUND(5) (SEA LEVEL)
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| 48 | C////////////|/////////
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| 49 | C////////////|///////// REGION 6 (VACUUM)
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| 50 | C////////////V///////// (MAY CONTAIN DETECTOR)
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| 51 | C ELECTRON OR PHOTON
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| 52 | C------------------------ BOUNDARY AT -BOUND(6)
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| 53 | C
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| 54 | C*********************************************************************
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| 55 | *KEEP,EPCONT.
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| 56 | COMMON/EPCONT/ EDEP,RATIO,TSTEP,TUSTEP,USTEP,TVSTEP,VSTEP,IDISC,
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| 57 | * IROLD,IRNEW,RHOFAC, EOLD,ENEW,EKE,ELKE,BETA2,GLE,
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| 58 | * TSCAT,IAUSFL
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| 59 | DOUBLE PRECISION EDEP,RATIO
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| 60 | REAL TSTEP,TUSTEP,USTEP,TVSTEP,VSTEP,RHOFAC,EOLD,ENEW,
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| 61 | * EKE,ELKE,BETA2,GLE,TSCAT
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| 62 | INTEGER IDISC,IROLD,IRNEW,IAUSFL(29)
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| 63 | *KEND.
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| 64 | COMMON/GEOM/ZALTIT,BOUND(6),NEWOBS,OBSLVL(10)
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| 65 | *KEEP,OBSPAR.
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| 66 | COMMON /OBSPAR/ OBSLEV,THCKOB,XOFF,YOFF,THETAP,PHIP,
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| 67 | * THETPR,PHIPR,NOBSLV
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| 68 | DOUBLE PRECISION OBSLEV(10),THCKOB(10),XOFF(10),YOFF(10),
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| 69 | * THETAP,THETPR(2),PHIP,PHIPR(2)
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| 70 | INTEGER NOBSLV
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| 71 | *KEEP,RUNPAR.
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| 72 | COMMON /RUNPAR/ FIXHEI,THICK0,HILOECM,HILOELB,
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| 73 | * STEPFC,NRRUN,NSHOW,PATAPE,MONIIN,
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| 74 | * MONIOU,MDEBUG,NUCNUC,
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| 75 | * CETAPE,
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| 76 | * SHOWNO,ISHW,NOPART,NRECS,NBLKS,MAXPRT,NDEBDL,
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| 77 | * N1STTR,MDBASE,
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| 78 | * DEBDEL,DEBUG,FDECAY,FEGS,FIRSTI,FIXINC,FIXTAR,
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| 79 | * FIX1I,FMUADD,FNKG,FPRINT,FDBASE
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| 80 | * ,GHEISH,GHESIG
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| 81 | COMMON /RUNPAC/ DSN,HOST,USER
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| 82 | DOUBLE PRECISION FIXHEI,THICK0,HILOECM,HILOELB
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| 83 | REAL STEPFC
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| 84 | INTEGER NRRUN,NSHOW,PATAPE,MONIIN,MONIOU,MDEBUG,NUCNUC,
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| 85 | * SHOWNO,ISHW,NOPART,NRECS,NBLKS,MAXPRT,NDEBDL,
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| 86 | * N1STTR,MDBASE
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| 87 | INTEGER CETAPE
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| 88 | CHARACTER*79 DSN
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| 89 | CHARACTER*20 HOST,USER
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| 90 |
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| 91 | LOGICAL DEBDEL,DEBUG,FDECAY,FEGS,FIRSTI,FIXINC,FIXTAR,
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| 92 | * FIX1I,FMUADD,FNKG,FPRINT,FDBASE
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| 93 | * ,GHEISH,GHESIG
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| 94 | *KEEP,STACKE.
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| 95 | COMMON/STACKE/ E,TIME,X,Y,Z,U,V,W,DNEAR,IQ,IGEN,IR,IOBS,LPCTE,NP
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| 96 | DOUBLE PRECISION E(60),TIME(60)
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| 97 | REAL X(60),Y(60),Z(60),U(60),V(60),W(60),DNEAR(60)
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| 98 | INTEGER IQ(60),IGEN(60),IR(60),IOBS(60),LPCTE(60),NP
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| 99 | *KEND.
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| 100 | COMMON/ACLOCK/NCLOCK,JCLOCK
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| 101 | C_____IF (NCLOCK.GT.JCLOCK) THEN
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| 102 | C______WRITE(MDEBUG,* )' HOWFAR:NP=',NP,' IR=',IR(NP),' IOBS=',IOBS(NP)
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| 103 | C______CALL AUSGB2
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| 104 | C_____END IF
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| 105 | IF (IR(NP).GT.1 .AND. IR(NP).LT.6) THEN
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| 106 | C *** WE ARE IN THE ATMOSPHERE - CHECK THE GEOMETRY
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| 107 | IRL=IR(NP)
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| 108 | C *** GOING FORWARD - CONSIDER FIRST SINCE MOST FREQUENT
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| 109 | NOBS=IOBS(NP)
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| 110 | IF (W(NP).GT.0.0) THEN
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| 111 | C *** TVAL IS DISTANCE TO NEXT BOUNDARY OR
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| 112 | C *** OBSERVATION LEVEL IN THIS DIRECTION
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| 113 | TVAL=(-Z(NP)-MAX(BOUND(IRL),OBSLVL(NOBS)))/W(NP)
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| 114 | IF (TVAL.GT.USTEP) THEN
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| 115 | C *** CAN TAKE CURRENTLY REQUESTED STEP
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| 116 | DNEAR(NP)=TVAL*W(NP)
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| 117 | ELSE
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| 118 | C *** GO TO DETECTOR OR BOUNDARY, WHICH IS CLOSER
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| 119 | USTEP=MAX(TVAL,0.0001)
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| 120 | IF (BOUND(IRL).GE.OBSLVL(NOBS)) THEN
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| 121 | C *** PARTICLE CROSSES BOUNDARY
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| 122 | IRNEW=IRL+1
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| 123 | C *** PARTICLE LEAVES AIR
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| 124 | IF((IRNEW.GE.6))IDISC=-1
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| 125 | END IF
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| 126 | IF (BOUND(IRL).LE.OBSLVL(NOBS)) THEN
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| 127 | C *** PARTICLE CROSSES DETECTOR
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| 128 | NEWOBS=NOBS+1
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| 129 | C *** MAKE A VERY SMALL STEP TO AVOID HANGUP OF PROGRAM
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| 130 | IF((USTEP.LE.0.0))USTEP = 0.0001
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| 131 | C *** TRANSPORT PARTICLE TO FINAL DETECTOR LEVEL AND DISCARD IT
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| 132 | IF((NEWOBS.GT.NOBSLV))IDISC=-1
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| 133 | END IF
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| 134 | END IF
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| 135 | C *** END OF W(NP)>0 CASE
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| 136 | C *** GOING UPWARD IN ATMOSPHERE
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| 137 | ELSE IF(W(NP).LT.0.0) THEN
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| 138 | C *** NO DETECTOR ABOVE PARTICLE
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| 139 | IF (NOBS.LE.1) THEN
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| 140 | C *** DISTANCE TO BOUNDARY ABOVE
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| 141 | TVAL=(-Z(NP)-BOUND(IRL-1))/W(NP)
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| 142 | IF (TVAL.GT.USTEP) THEN
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| 143 | C *** CAN TAKE CURRENTLY REQUESTED STEP
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| 144 | DNEAR(NP)=MIN(Z(NP)+BOUND(IRL-1),-(Z(NP)+BOUND(IRL)))
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| 145 | ELSE
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| 146 | C *** CROSS BOUNDARY ABOVE
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| 147 | USTEP=MAX(TVAL,0.0001)
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| 148 | IRNEW=IRL-1
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| 149 | END IF
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| 150 | ELSE
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| 151 | C *** BOUNDARY AND DETECTOR ABOVE PARTICLE
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| 152 | TVAL=(-Z(NP)-MIN(BOUND(IRL-1),OBSLVL(NOBS-1)))/W(NP)
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| 153 | IF (TVAL.GT.USTEP) THEN
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| 154 | C *** CAN TAKE CURRENTLY REQUESTED STEP
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| 155 | C *** DNEAR IS CLOSEST DISTANCE TO DETECTOR OR
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| 156 | C *** BOUNDARY ABOVE OR BELOW PARTICLE
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| 157 | DNEAR(NP)=MIN(Z(NP)+MIN(BOUND(IRL-1),OBSLVL(NOBS-1)), -Z(NP) +
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| 158 | * MAX(BOUND(IRL),OBSLVL(NOBS)))
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| 159 | ELSE
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| 160 | C *** TAKE ONLY STEP UP TO BOUNDARY OR DETECTOR
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| 161 | USTEP=MAX(TVAL,0.0001)
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| 162 | IF (BOUND(IRL-1).LE.OBSLVL(NOBS-1)) THEN
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| 163 | C *** PARTICLE CROSSES BOUNDARY ABOVE
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| 164 | IRNEW=IRL-1
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| 165 | C *** PARTICLE LEAVES ATMOSPHERE
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| 166 | IF((IRNEW.LE.1))IDISC=1
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| 167 | END IF
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| 168 | IF ((BOUND(IRL-1).GE.OBSLVL(NOBS-1))) THEN
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| 169 | C *** PARTICLE CROSSES DETECTOR ABOVE; IT IS NOT
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| 170 | C *** PRINTED, BECAUSE IT MUST HIT DETECTOR DOWNWARDS
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| 171 | NEWOBS=NOBS-1
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| 172 | IOBS(NP)=NEWOBS
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| 173 | END IF
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| 174 | END IF
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| 175 | END IF
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| 176 | C *** END W(NP)<0 CASE
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| 177 | C *** PARTICLE IS MOVING HORIZONTALLY, CANNOT HIT BOUNDARY
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| 178 | ELSE IF(W(NP).EQ.0.0) THEN
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| 179 | RETURN
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| 180 | END IF
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| 181 | C *** END OF ATMOSPHERE REGION CASE
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| 182 | ELSE IF(IR(NP).EQ.6) THEN
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| 183 | C *** TERMINATE THIS HISTORY, IT IS PAST THE ATMOSPHERE
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| 184 | IDISC=1
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| 185 | C *** WE ARE IN THE REGION WITH SOURCE ABOVE AIR
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| 186 | ELSE IF(IR(NP).EQ.1) THEN
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| 187 | IF (W(NP).GT.0.0) THEN
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| 188 | C *** IT MUST BE A SOURCE PARTICLE ON BOUNDARY 1
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| 189 | USTEP=0.0001
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| 190 | IRNEW=2
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| 191 | ELSE
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| 192 | C *** IT IS A REFLECTED PARTICLE, DISCARD IT
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| 193 | IDISC=1
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| 194 | END IF
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| 195 | C *** END REGION 1 CASE
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| 196 | END IF
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| 197 | RETURN
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| 198 | END
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