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*** |
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* subroutine to compute the Integral(B dl) along the trajectory |
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*** |
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*** |
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* |
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* created by paolo papini, 11 oct 2005 |
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* |
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* c$$$ max: modified by massimo bongi, 11 oct 2005 (later...) |
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* |
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*** |
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subroutine CalcBdL(Nstep,BdL,IFAIL) |
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IMPLICIT DOUBLE PRECISION (A-H,O-Z) |
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real BdL,vvv(3),fff(3) |
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real*8 f(3) |
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include 'commontracker.f' !tracker general common |
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include 'common_mini_2.f' !common for the tracking procedure |
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* |
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* set parameters for GRKUTA from ZINI to the first plane |
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* |
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c$$$ max IF(AL(5).NE.0) CHARGE=AL_P(5)/DABS(AL_P(5)) |
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c$$$ max IF(AL(5).NE.0) CHARGE=AL_P(5)/DABS(AL_P(5)) |
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c$$$ IF(AL(5).NE.0) CHARGE=AL(5)/DABS(AL(5)) |
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IF(AL(5).NE.0) CHARGE=AL(5)/DABS(AL(5)) |
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IF(AL(5).EQ.0) CHARGE=1. |
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VOUT(1)=AL(1) |
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VOUT(2)=AL(2) |
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VOUT(3)=ZINI ! DBLE(Z0)-DBLE(ZSPEC) |
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VOUT(4)=AL(3)*DCOS(AL(4)) |
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VOUT(5)=AL(3)*DSIN(AL(4)) |
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VOUT(6)=-1.*DSQRT(1.-AL(3)**2) |
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IF(AL(5).NE.0.) VOUT(7)=DABS(1./AL(5)) |
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IF(AL(5).EQ.0.) VOUT(7)=1.E8 |
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* |
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* first integrate the track from reference plane to first trk plane |
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* |
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* zout=zm(1) |
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zout=zv(1) |
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step=vout(3)-zout |
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10 DO J=1,7 |
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VECT(J)=VOUT(J) |
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VECTINI(J)=VOUT(J) |
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ENDDO |
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11 continue |
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CALL GRKUTA(CHARGE,STEP,VECT,VOUT) |
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IF(VOUT(3).GT.VECT(3)) THEN |
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IFAIL=1 |
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PRINT *,'BdL (grkuta): WARNING ===> backward track!!' |
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print*,'charge',charge |
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print*,'vect',vect |
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print*,'vout',vout |
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print*,'step',step |
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RETURN |
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ENDIF |
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Z=VOUT(3) |
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IF(Z.LE.Zout+TOLL.AND.Z.GE.Zout-TOLL) GOTO 100 |
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IF(Z.GT.Zout+TOLL) GOTO 10 |
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IF(Z.LE.Zout-TOLL) THEN |
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STEP=STEP*(Zout-VECT(3))/(Z-VECT(3)) |
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DO J=1,7 |
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VECT(J)=VECTINI(J) |
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ENDDO |
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GOTO 11 |
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ENDIF |
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* |
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* then integrate B o dL along the track, from the first to the last plane |
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* |
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100 continue |
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BdL=0. |
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* dz=(zm(1)-zm(6))/float(Nstep) |
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dz = (zv(1)-zv(6))/float(Nstep) |
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zout = zv(6) |
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do i=1,10*Nstep |
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BdLstep=0. |
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vvv(1)=sngl(vout(1)) |
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vvv(2)=sngl(vout(2)) |
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vvv(3)=sngl(vout(3)) |
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CALL GUFLD(VVV,FFF) |
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do j=1,3 |
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f(j)=dble(fff(j)) |
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enddo |
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c zout=vout(3)-dz |
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step = dz |
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20 DO J=1,7 |
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VECT(J)=VOUT(J) |
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VECTINI(J)=VOUT(J) |
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ENDDO |
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21 continue |
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CALL GRKUTA(CHARGE,STEP,VECT,VOUT) |
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c$$$ BdLstep=BdLstep+ |
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c$$$ $ (vout(1)-vect(1))*f(1)+ |
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c$$$ $ (vout(2)-vect(2))*f(2)+ |
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c$$$ $ (vout(3)-vect(3))*f(3) |
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BdLstep=BdLstep+ |
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$ sqrt( |
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$ ((vout(2)-vect(2))*f(3)-(vout(3)-vect(3))*f(2))**2+ |
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$ ((vout(3)-vect(3))*f(1)-(vout(1)-vect(1))*f(3))**2+ |
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$ ((vout(1)-vect(1))*f(2)-(vout(2)-vect(2))*f(1))**2 |
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$ ) |
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IF(VOUT(3).GT.VECT(3)) THEN |
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IFAIL=1 |
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PRINT *,'BdL (grkuta): WARNING ===> backward track!!' |
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print*,'charge',charge |
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print*,'vect',vect |
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print*,'vout',vout |
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print*,'step',step |
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RETURN |
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ENDIF |
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200 continue |
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BdL=BdL+sngl(BdLstep*1.D-3) !Tesla * meters |
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c print*,i,' #### ',BdL |
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Z=VOUT(3) |
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IF(Z.LE.Zout+TOLL.AND.Z.GE.Zout-TOLL) GOTO 2000 !end |
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IF(Z.LE.Zout-TOLL) THEN |
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STEP=STEP*(Zout-VECT(3))/(Z-VECT(3)) |
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DO J=1,7 |
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VECT(J)=VECTINI(J) |
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ENDDO |
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BdL=BdL-sngl(BdLstep*1.D-3) !Tesla * meters |
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BdLstep=0. |
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GOTO 21 |
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ENDIF |
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enddo |
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2000 continue |
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c$$$ print*,' #### ',BdL |
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c$$$ print*,' #### ',xgood |
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c$$$ print*,' #### ',ygood |
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c$$$ print*,'=========================================' |
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return |
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end |
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