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Fundamental TechnologiesCassini MIMI Pages |
Numerical Computation of Energy-Dependent Geometric Factors of E and F Electron Detectors of CASSINI/MIMI/LEMMS, Technical Report by Xiaodong Hong and Thomas P. Armstrong, May 10, 1997
******************************************************************************* * * * PROGRAM 2.4 * * * ******************************************************************************* * * * TRACKSUB3.FOR * * THIS IS THE MODIFICATION OF TRACKSUB5 AND SHOULD BE LINKED WITH TRAJ2PT. * * * *******************************************************************************
SUBROUTINE VELOPROJ(V,VX,VY,VZ,THETA,PHI)
C PURPOSE : GIVEN THE VELOCITY, TO FIND THE COMPONENTS OF VELOCITY C IN THE CARTESIAN COORDINATE SYSTEM I.E. TO FIND Vx,Vy,Vz
REAL*8 PHI,PHI1,PI,RAD,THETA,THETA1,V,VX,VY,VZ
PI = 4.0D0 * DATAN(1.0D0)
RAD = PI/180.0D0
THETA1 = THETA * RAD
PHI1 = PHI * RAD
VX = V * DSIN(THETA1) * DCOS(PHI1)
VY = V * DSIN(THETA1) * DSIN(PHI1)
VZ = V * DCOS(THETA1)
RETURN
END
C---------------------------------------------------------------------
C---------------------------------------------------------------------
REAL*8 FUNCTION EVELO(EK)
C PURPOSE : TO FIND THE RATIO OF THE VELOCITY OF THE e TO THE VELOCITY C OF LIGHT. I.E. TO COMPUTE V/C GIVEN THE INITIAL ENERGY OF THE ELECTRON C IN MEV. 2 2 C FORMULA USED : (V/C) = 1 - (REST MASS) C ---------------- 2 C (K.E. + REST MASS)
IMPLICIT NONE
REAL*8 C,E1,EK,TEMP
DATA C/2.998D0/,E1/0.511D0/
TEMP = E1/(E1+EK)
EVELO = C * DSQRT(1 - TEMP*TEMP)
RETURN
END
C---------------------------------------------------------------------
C----------------------------------------------------------------------
SUBROUTINE GEOM
C PURPOSE: THIS SUBROUTINE OPENS THE FILES: C COOR*.DAT:IT CONTAINS THE COORDINATES OF ALL THE VERTICES OF ALL THE C PLANE SURFACES THAT THE PARTICLE IS LIKELY TO HIT C COEFF.DAT:IT CONTAINS THE CONSTANT COEFFICIENTS A,B,C,D OF EACH OF THE C PLANES THAT THE PARTILCE IS LIKELY TO HIT C AND IT INITIALISES THE ARRAYS: C CHAN:EACH ROW CORRESPONDS TO A PLANE SURFACE; C COL. 1:NO. OF VERTICES OF THAT PLANE POLYGON C COL. 2>>>COL. NVERT*3+1 :ALL THE COORDINATES OF THE VERTICES C COEFF:EACH ROW CORRESPONDS TO A PLANE POLYGON C COL. 1>>>COL. 4 :A,B,C,D
IMPLICIT NONE
CHARACTER*72 FNAME,FNAME1
INTEGER HIT,I,I1,I2,J,K,MAXCOO,MAXSURF,NS,NV,NSURF,NVERT,NTY
PARAMETER (MAXCOO=62,MAXSURF=62)
REAL*8 A,B,C,D
REAL*8 CHAN(MAXSURF,MAXCOO),COEFF(MAXSURF,4),TLN(2,3),VERT(10,3),
& Y(6)
COMMON /CHAN/CHAN,/TLN/TLN,/COEFF/COEFF,/NTY/NTY
WRITE(6,*) 'ENTER THE NAME OF THE FILE OF COORDINATES'
READ(5,10) FNAME
OPEN (UNIT=1,STATUS='OLD',FILE=FNAME)
WRITE(6,*) 'ENTER THE NAME OF THE FILE OF COEFFICIENTS'
READ(5,10) FNAME1
OPEN (UNIT=2,STATUS='OLD',FILE=FNAME1)
READ (1,*)
2 READ(1,*,END=70) NTY
READ(1,*) NVERT
CHAN(NTY,1) = DFLOAT(NVERT)
I1=2
3 READ(1,20,ERR=2) (CHAN(NTY,K),K=I1,I1+2)
I1=K
GO TO 3
70 CLOSE(1)
I2=1
4 READ(2,30,END=80) NS,NV,(COEFF(I2,J),J=1,4)
I2=I2+1
GO TO 4
80 CLOSE(2)
D DO I=1,NTY D WRITE(6,*) 'SURFACE NO.:',I D WRITE(6,*)'COORDINATES ARE:' D WRITE(6,*) (CHAN(I,J),J=2,IDINT(CHAN(I,1))*3+1) D WRITE(6,*) 'THE PLANE COEFFICIENTS ARE:' D WRITE(6,*) (COEFF(I,J),J=1,4) D END DO
10 FORMAT(A72) 20 FORMAT(3(X,F9.6)) 30 FORMAT(1X,I3,1X,I3,4(1X,D13.6))
RETURN
END
C-------------------------------------------------------------------------
C-------------------------------------------------------------------------
SUBROUTINE PASSOUTPUT
C PURPOSE:THIS PROGRAM OUTPUTS THE POLAR & THE AZIMUTHAL ANGLES C OF THE ESCAPING PARTICLES ONTO A FILE. C C NPAS : TOTAL NO. OF PARTICLES THAT ESCAPE THE SENSOR ASSEMBLY C PAS(I,J) : 2-D ARRAY C I : NO. OF ESCAPING PARTICLE C J=1: POLAR ANGLE AT THE DETECTOR C =2: AZIMUTHAL ANGLE AT THE DETECTOR C =3: POLAR ANGLE AT THE APERTURE C =4: AZIMUTHAL ANGLE AT THE APERTURE C =5-10 :X,Y,Z,Vx,Vy,Vz OF THE ESCAPING PARTICLE
IMPLICIT NONE
CHARACTER*72 FNAME1
INTEGER I,J,NPAS,NTRAJ
REAL*8 PI,RAD
COMMON /FNAME1/FNAME1
INCLUDE 'PASS.CMN'
PI = 4.0D0*DATAN(1.0D0)
RAD = 180.0D0/PI
c OPEN(UNIT=8,FILE=FNAME1,ACCESS='SEQUENTIAL',STATUS='OLD')
c WRITE(8,*) 'NPAS:',NPAS
c WRITE(8,*)
c WRITE(8,20)
DO I=1,NPAS
PAS(I,3) = PAS(I,3)*RAD
PAS(I,4) = PAS(I,4)*RAD
c WRITE(8,10) (PAS(I,J),J=1,10)
END DO
10 FORMAT(1X,4(F7.2,X),6(D15.8,X))
20 FORMAT (1X,' THETA ',1X,' PHI ',1X,' OMEGA ',1X,' PSI ',
& X,6X,'X(+02)',3X,X,6X,'Y(+02)',3X,X,6X,'Z(+02)',3X,X,4X,
& 'VX(+10)',4X,X,4X,'VY(+10)',4X,X,4X,'VZ(+10)',4X)
RETURN
END
C----------------------------------------------------------------------------
C----------------------------------------------------------------------------
REAL*8 FUNCTION FPHI(XT,YT)
C
IMPLICIT NONE
REAL*8 PI,TOL,XT,YT
PARAMETER (TOL=0.1D-10)
D PRINT *,'TOL: ',TOL
PI=4.0D0*DATAN(1.0D0)
IF (DABS(XT).LT.TOL .AND. YT.GT.0.0D0) THEN
FPHI=PI/2.0D0
D PRINT *,'I AM IN 1'
ELSE
IF (DABS(XT) .LT. TOL .AND. YT.LT.0.0D0) THEN
FPHI=1.5D0*PI
D PRINT *,'I AM IN 2'
ELSE
IF (XT.GT.0.D0.AND.YT.GE.0.0D0) THEN
FPHI=DATAN(YT/XT)
D PRINT *,'I AM IN 3'
ELSE
IF (XT.LT.0.0D0.AND.YT.GE.0.D0) THEN
FPHI=PI-DATAN(YT/DABS(XT))
D PRINT *,'I AM IN 4'
ELSE
IF (XT.LT.0.D0.AND.YT.LE.0.0D0) THEN
FPHI=PI+DATAN(YT/XT)
D PRINT *,'I AM IN 5'
ELSE
FPHI=2*PI-DATAN(DABS(YT)/XT)
D PRINT *,'I AM IN 6'
END IF
END IF
END IF
END IF
END IF
RETURN
END
C------------------------------------------------------------------------
C------------------------------------------------------------------------
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Updated 6/6/02, T. Hunt-Ward
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