| 1 |
mocchiut |
1.1 |
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| 2 |
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************************************************************* |
| 3 |
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* |
| 4 |
pam-fi |
1.2 |
* Routines to compute the NPOINT track intersection points |
| 5 |
mocchiut |
1.1 |
* with planes of z-coordinate given by ZIN |
| 6 |
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* given the track parameters |
| 7 |
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* |
| 8 |
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* The routine is based on GRKUTA, which computes the |
| 9 |
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* trajectory of a charged particle in a magnetic field |
| 10 |
pam-fi |
1.2 |
* by solving the equations of motion with Runge-Kuta method |
| 11 |
mocchiut |
1.1 |
* |
| 12 |
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* Variables that have to be assigned when the subroutine |
| 13 |
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* is called: |
| 14 |
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* |
| 15 |
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* ZIN(1-NPOINT) ----> z coordinates of the planes |
| 16 |
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* AL_P(1-5) ----> track-parameter vector |
| 17 |
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* |
| 18 |
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* NB !!! |
| 19 |
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* The routine works properly only if the |
| 20 |
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* planes are numbered in descending order |
| 21 |
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* |
| 22 |
pam-fi |
1.2 |
* Routines: |
| 23 |
mocchiut |
1.1 |
* |
| 24 |
pam-fi |
1.2 |
* DOTRACK(NPOINT,ZIN,XOUT,YOUT,AL_P,IFAIL) |
| 25 |
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* - old routine |
| 26 |
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* |
| 27 |
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* DOTRACK2(NPOINT,ZIN,XOUT,YOUT,THXOUT,THYOUT,AL_P,IFAIL) |
| 28 |
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* - as the old one, but: |
| 29 |
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* -- the projected angles are given as output |
| 30 |
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* -- the track lengths are given as output: |
| 31 |
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* ---- for planes above the reference plane, the length until |
| 32 |
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* the lower closest plane (reference plane included) |
| 33 |
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* ---- for planes below the reference plane, the length until |
| 34 |
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* the higher closest plane (reference plane included) |
| 35 |
mocchiut |
1.1 |
* |
| 36 |
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************************************************************** |
| 37 |
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| 38 |
pam-fi |
1.2 |
SUBROUTINE |
| 39 |
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$ DOTRACK2(NPOINT,ZIN,XOUT,YOUT,THXOUT,THYOUT,TLOUT,AL_P,IFAIL) |
| 40 |
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| 41 |
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IMPLICIT DOUBLE PRECISION (A-H,O-Z) |
| 42 |
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| 43 |
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DIMENSION VECT(8),VECTINI(8),VOUT(8) |
| 44 |
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DATA TOLL/1.d-8/ |
| 45 |
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* tolerance in reaching the next plane during the tracking procedure |
| 46 |
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* ----------------------------------------------- |
| 47 |
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* I/O parameters |
| 48 |
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PARAMETER (NPOINT_MAX=100) |
| 49 |
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DIMENSION ZIN(NPOINT_MAX) |
| 50 |
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DIMENSION XOUT(NPOINT_MAX),YOUT(NPOINT_MAX) |
| 51 |
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DIMENSION THXOUT(NPOINT_MAX),THYOUT(NPOINT_MAX) |
| 52 |
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DIMENSION TLOUT(NPOINT_MAX) |
| 53 |
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DIMENSION AL_P(5) |
| 54 |
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* ----------------------------------------------- |
| 55 |
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DATA ZINI/23.5/ !z coordinate of the reference plane |
| 56 |
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| 57 |
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* ================================================================== |
| 58 |
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* divide the track in two parts: below and above the reference plane |
| 59 |
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* ================================================================== |
| 60 |
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IUPDOWN=0 |
| 61 |
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DO I=1,NPOINT |
| 62 |
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IF(ZIN(I).LT.ZINI)THEN |
| 63 |
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if(i.ne.1)IUPDOWN=I |
| 64 |
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GOTO 88 |
| 65 |
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ENDIF |
| 66 |
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IUPDOWN=NPOINT+1 |
| 67 |
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ENDDO |
| 68 |
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88 CONTINUE |
| 69 |
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| 70 |
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* ================================================================== |
| 71 |
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* track from reference plane DOWN |
| 72 |
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* ================================================================== |
| 73 |
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* parameters for GRKUTA |
| 74 |
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IF(AL_P(5).NE.0) CHARGE=AL_P(5)/DABS(AL_P(5)) |
| 75 |
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IF(AL_P(5).EQ.0) CHARGE=1. |
| 76 |
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VOUT(1)=AL_P(1) |
| 77 |
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VOUT(2)=AL_P(2) |
| 78 |
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VOUT(3)=ZINI |
| 79 |
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VOUT(4)=AL_P(3)*DCOS(AL_P(4)) |
| 80 |
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VOUT(5)=AL_P(3)*DSIN(AL_P(4)) |
| 81 |
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VOUT(6)=-1.*DSQRT(1.-AL_P(3)**2) |
| 82 |
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IF(AL_P(5).NE.0.) VOUT(7)=DABS(1./AL_P(5)) |
| 83 |
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IF(AL_P(5).EQ.0.) VOUT(7)=1.E8 |
| 84 |
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DO I=MAX(IUPDOWN,1),NPOINT |
| 85 |
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step=vout(3)-zin(i) |
| 86 |
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VOUT(8)= 0 |
| 87 |
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c$$$ print*,'DOWN ',i,' - Track from ', |
| 88 |
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c$$$ $ vout(3),' to ',zin(i),' step ',step |
| 89 |
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10 DO J=1,8 |
| 90 |
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VECT(J)=VOUT(J) |
| 91 |
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VECTINI(J)=VOUT(J) |
| 92 |
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ENDDO |
| 93 |
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11 continue |
| 94 |
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CALL GRKUTA2(CHARGE,STEP,VECT,VOUT) |
| 95 |
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IF(VOUT(3).GT.VECT(3)) THEN |
| 96 |
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IFAIL=1 |
| 97 |
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c$$$ PRINT *,'=== WARNING ===> tracciamento invertito (DOWN)' |
| 98 |
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c$$$ print*,'charge',charge |
| 99 |
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c$$$ print*,'vect',vect |
| 100 |
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c$$$ print*,'vout',vout |
| 101 |
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c$$$ print*,'step',step |
| 102 |
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RETURN |
| 103 |
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ENDIF |
| 104 |
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Z=VOUT(3) |
| 105 |
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IF(Z.LE.ZIN(I)+TOLL.AND.Z.GE.ZIN(I)-TOLL) GOTO 100 |
| 106 |
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IF(Z.GT.ZIN(I)+TOLL) GOTO 10 |
| 107 |
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IF(Z.LE.ZIN(I)-TOLL) THEN |
| 108 |
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STEP=STEP*(ZIN(I)-VECT(3))/(Z-VECT(3)) |
| 109 |
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DO J=1,8 |
| 110 |
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VECT(J)=VECTINI(J) |
| 111 |
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ENDDO |
| 112 |
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GOTO 11 |
| 113 |
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ENDIF |
| 114 |
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100 XOUT(I)=VOUT(1) |
| 115 |
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YOUT(I)=VOUT(2) |
| 116 |
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ZIN(I)=VOUT(3) |
| 117 |
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IF(VOUT(3).ne.0)THEN |
| 118 |
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THXOUT(I)=DATAN(VOUT(4)/VOUT(6))*180./ACOS(-1.) |
| 119 |
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THYOUT(I)=DATAN(VOUT(5)/VOUT(6))*180./ACOS(-1.) |
| 120 |
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ENDIF |
| 121 |
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TLOUT(I) = VOUT(8) |
| 122 |
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c print*,'D ',VECT(3),VOUT(3),VOUT(8),STEP |
| 123 |
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ENDDO |
| 124 |
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| 125 |
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| 126 |
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| 127 |
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* ================================================================== |
| 128 |
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* track from reference plane UP |
| 129 |
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* ================================================================== |
| 130 |
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* parameters for GRKUTA: |
| 131 |
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* -opposite charge |
| 132 |
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* -opposite momentum direction |
| 133 |
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IF(AL_P(5).NE.0) CHARGE=-AL_P(5)/DABS(AL_P(5)) |
| 134 |
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IF(AL_P(5).EQ.0) CHARGE=-1. |
| 135 |
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VOUT(1)=AL_P(1) |
| 136 |
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VOUT(2)=AL_P(2) |
| 137 |
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VOUT(3)=ZINI |
| 138 |
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VOUT(4)=-AL_P(3)*DCOS(AL_P(4)) |
| 139 |
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VOUT(5)=-AL_P(3)*DSIN(AL_P(4)) |
| 140 |
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VOUT(6)=1.*DSQRT(1.-AL_P(3)**2) |
| 141 |
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IF(AL_P(5).NE.0.) VOUT(7)=DABS(1./AL_P(5)) |
| 142 |
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IF(AL_P(5).EQ.0.) VOUT(7)=1.E8 |
| 143 |
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DO I=MIN((IUPDOWN-1),NPOINT),1,-1 |
| 144 |
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step=vout(3)-zin(i) |
| 145 |
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step = -step |
| 146 |
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VOUT(8)=0 |
| 147 |
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c$$$ print*,'UP ',i,' - Track from ', |
| 148 |
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c$$$ $ vout(3),' to ',zin(i),' step ',step |
| 149 |
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20 DO J=1,8 |
| 150 |
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VECT(J)=VOUT(J) |
| 151 |
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VECTINI(J)=VOUT(J) |
| 152 |
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ENDDO |
| 153 |
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22 continue |
| 154 |
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CALL GRKUTA2(CHARGE,STEP,VECT,VOUT) |
| 155 |
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IF(VOUT(3).LT.VECT(3)) THEN |
| 156 |
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IFAIL=1 |
| 157 |
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c$$$ PRINT *,'=== WARNING ===> tracciamento invertito (UP)' |
| 158 |
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c$$$ print*,'charge',charge |
| 159 |
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c$$$ print*,'vect',vect |
| 160 |
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c$$$ print*,'vout',vout |
| 161 |
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c$$$ print*,'step',step |
| 162 |
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RETURN |
| 163 |
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ENDIF |
| 164 |
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Z=VOUT(3) |
| 165 |
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IF(Z.LE.ZIN(I)+TOLL.AND.Z.GE.ZIN(I)-TOLL) GOTO 200 |
| 166 |
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IF(Z.LT.ZIN(I)-TOLL) GOTO 20 |
| 167 |
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IF(Z.GE.ZIN(I)+TOLL) THEN |
| 168 |
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STEP=STEP*(ZIN(I)-VECT(3))/(Z-VECT(3)) |
| 169 |
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DO J=1,8 |
| 170 |
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VECT(J)=VECTINI(J) |
| 171 |
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ENDDO |
| 172 |
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GOTO 22 |
| 173 |
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ENDIF |
| 174 |
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200 XOUT(I)=VOUT(1) |
| 175 |
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YOUT(I)=VOUT(2) |
| 176 |
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ZIN(I)=VOUT(3) |
| 177 |
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IF(VOUT(3).ne.0)THEN |
| 178 |
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THXOUT(I)=DATAN(VOUT(4)/VOUT(6))*180./ACOS(-1.) |
| 179 |
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THYOUT(I)=DATAN(VOUT(5)/VOUT(6))*180./ACOS(-1.) |
| 180 |
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ENDIF |
| 181 |
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TLOUT(I) = VOUT(8) |
| 182 |
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| 183 |
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ENDDO |
| 184 |
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| 185 |
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RETURN |
| 186 |
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END |
| 187 |
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| 188 |
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************************************************************************ |
| 189 |
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* |
| 190 |
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* |
| 191 |
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* |
| 192 |
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* |
| 193 |
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************************************************************************ |
| 194 |
mocchiut |
1.1 |
SUBROUTINE DOTRACK(NPOINT,ZIN,XOUT,YOUT,AL_P,IFAIL) |
| 195 |
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| 196 |
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IMPLICIT DOUBLE PRECISION (A-H,O-Z) |
| 197 |
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| 198 |
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DIMENSION VECT(7),VECTINI(7),VOUT(7) |
| 199 |
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DATA TOLL/1.d-8/ |
| 200 |
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* tolerance in reaching the next plane during the tracking procedure |
| 201 |
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* ----------------------------------------------- |
| 202 |
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* I/O parameters |
| 203 |
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PARAMETER (NPOINT_MAX=100) |
| 204 |
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DIMENSION ZIN(NPOINT_MAX) |
| 205 |
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DIMENSION XOUT(NPOINT_MAX),YOUT(NPOINT_MAX) |
| 206 |
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DIMENSION AL_P(5) |
| 207 |
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* ----------------------------------------------- |
| 208 |
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DATA ZINI/23.5/ !z coordinate of the reference plane |
| 209 |
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| 210 |
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* ================================================================== |
| 211 |
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* divide the track in two parts: below and above the reference plane |
| 212 |
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* ================================================================== |
| 213 |
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IUPDOWN=0 |
| 214 |
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DO I=1,NPOINT |
| 215 |
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IF(ZIN(I).LT.ZINI)THEN |
| 216 |
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if(i.ne.1)IUPDOWN=I |
| 217 |
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GOTO 88 |
| 218 |
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ENDIF |
| 219 |
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IUPDOWN=NPOINT+1 |
| 220 |
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ENDDO |
| 221 |
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88 CONTINUE |
| 222 |
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| 223 |
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* ================================================================== |
| 224 |
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* track from reference plane DOWN |
| 225 |
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* ================================================================== |
| 226 |
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* parameters for GRKUTA |
| 227 |
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IF(AL_P(5).NE.0) CHARGE=AL_P(5)/DABS(AL_P(5)) |
| 228 |
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IF(AL_P(5).EQ.0) CHARGE=1. |
| 229 |
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VOUT(1)=AL_P(1) |
| 230 |
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VOUT(2)=AL_P(2) |
| 231 |
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VOUT(3)=ZINI |
| 232 |
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VOUT(4)=AL_P(3)*DCOS(AL_P(4)) |
| 233 |
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VOUT(5)=AL_P(3)*DSIN(AL_P(4)) |
| 234 |
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VOUT(6)=-1.*DSQRT(1.-AL_P(3)**2) |
| 235 |
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IF(AL_P(5).NE.0.) VOUT(7)=DABS(1./AL_P(5)) |
| 236 |
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IF(AL_P(5).EQ.0.) VOUT(7)=1.E8 |
| 237 |
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DO I=MAX(IUPDOWN,1),NPOINT |
| 238 |
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step=vout(3)-zin(i) |
| 239 |
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c$$$ print*,'DOWN ',i,' - Track from ', |
| 240 |
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c$$$ $ vout(3),' to ',zin(i),' step ',step |
| 241 |
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10 DO J=1,7 |
| 242 |
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VECT(J)=VOUT(J) |
| 243 |
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VECTINI(J)=VOUT(J) |
| 244 |
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ENDDO |
| 245 |
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11 continue |
| 246 |
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CALL GRKUTA(CHARGE,STEP,VECT,VOUT) |
| 247 |
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IF(VOUT(3).GT.VECT(3)) THEN |
| 248 |
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IFAIL=1 |
| 249 |
pam-fi |
1.2 |
c$$$ PRINT *,'=== WARNING ===> tracciamento invertito (DOWN)' |
| 250 |
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c$$$ print*,'charge',charge |
| 251 |
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c$$$ print*,'vect',vect |
| 252 |
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c$$$ print*,'vout',vout |
| 253 |
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c$$$ print*,'step',step |
| 254 |
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RETURN |
| 255 |
mocchiut |
1.1 |
ENDIF |
| 256 |
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Z=VOUT(3) |
| 257 |
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IF(Z.LE.ZIN(I)+TOLL.AND.Z.GE.ZIN(I)-TOLL) GOTO 100 |
| 258 |
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IF(Z.GT.ZIN(I)+TOLL) GOTO 10 |
| 259 |
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IF(Z.LE.ZIN(I)-TOLL) THEN |
| 260 |
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STEP=STEP*(ZIN(I)-VECT(3))/(Z-VECT(3)) |
| 261 |
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DO J=1,7 |
| 262 |
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VECT(J)=VECTINI(J) |
| 263 |
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ENDDO |
| 264 |
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GOTO 11 |
| 265 |
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ENDIF |
| 266 |
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100 XOUT(I)=VOUT(1) |
| 267 |
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YOUT(I)=VOUT(2) |
| 268 |
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ZIN(I)=VOUT(3) |
| 269 |
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* THXOUT(I)= |
| 270 |
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* THYOUT(I)= |
| 271 |
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ENDDO |
| 272 |
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| 273 |
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| 274 |
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| 275 |
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* ================================================================== |
| 276 |
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* track from reference plane UP |
| 277 |
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* ================================================================== |
| 278 |
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* parameters for GRKUTA: |
| 279 |
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* -opposite charge |
| 280 |
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* -opposite momentum direction |
| 281 |
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IF(AL_P(5).NE.0) CHARGE=-AL_P(5)/DABS(AL_P(5)) |
| 282 |
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IF(AL_P(5).EQ.0) CHARGE=-1. |
| 283 |
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VOUT(1)=AL_P(1) |
| 284 |
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VOUT(2)=AL_P(2) |
| 285 |
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VOUT(3)=ZINI |
| 286 |
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VOUT(4)=-AL_P(3)*DCOS(AL_P(4)) |
| 287 |
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VOUT(5)=-AL_P(3)*DSIN(AL_P(4)) |
| 288 |
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VOUT(6)=1.*DSQRT(1.-AL_P(3)**2) |
| 289 |
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IF(AL_P(5).NE.0.) VOUT(7)=DABS(1./AL_P(5)) |
| 290 |
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IF(AL_P(5).EQ.0.) VOUT(7)=1.E8 |
| 291 |
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DO I=MIN((IUPDOWN-1),NPOINT),1,-1 |
| 292 |
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step=vout(3)-zin(i) |
| 293 |
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step = -step |
| 294 |
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c$$$ print*,'UP ',i,' - Track from ', |
| 295 |
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c$$$ $ vout(3),' to ',zin(i),' step ',step |
| 296 |
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20 DO J=1,7 |
| 297 |
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VECT(J)=VOUT(J) |
| 298 |
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VECTINI(J)=VOUT(J) |
| 299 |
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ENDDO |
| 300 |
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22 continue |
| 301 |
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CALL GRKUTA(CHARGE,STEP,VECT,VOUT) |
| 302 |
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IF(VOUT(3).LT.VECT(3)) THEN |
| 303 |
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IFAIL=1 |
| 304 |
pam-fi |
1.2 |
c$$$ PRINT *,'=== WARNING ===> tracciamento invertito (UP)' |
| 305 |
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c$$$ print*,'charge',charge |
| 306 |
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c$$$ print*,'vect',vect |
| 307 |
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c$$$ print*,'vout',vout |
| 308 |
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c$$$ print*,'step',step |
| 309 |
mocchiut |
1.1 |
RETURN |
| 310 |
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ENDIF |
| 311 |
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Z=VOUT(3) |
| 312 |
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IF(Z.LE.ZIN(I)+TOLL.AND.Z.GE.ZIN(I)-TOLL) GOTO 200 |
| 313 |
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IF(Z.LT.ZIN(I)-TOLL) GOTO 20 |
| 314 |
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IF(Z.GE.ZIN(I)+TOLL) THEN |
| 315 |
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STEP=STEP*(ZIN(I)-VECT(3))/(Z-VECT(3)) |
| 316 |
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DO J=1,7 |
| 317 |
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VECT(J)=VECTINI(J) |
| 318 |
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ENDDO |
| 319 |
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GOTO 22 |
| 320 |
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ENDIF |
| 321 |
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200 XOUT(I)=VOUT(1) |
| 322 |
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YOUT(I)=VOUT(2) |
| 323 |
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ZIN(I)=VOUT(3) |
| 324 |
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| 325 |
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ENDDO |
| 326 |
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| 327 |
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RETURN |
| 328 |
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END |
| 329 |
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