VOYAGER
Voyager LECP Data Analysis Handbook
Instrument Modeling Reports
by Sheela Shodhan
E.7 TRACKSUB5
************************************************************************** * THIS FILE CONTAINS THE SUBROUTINES: * * (1) EVELO : TO DETERMINE THE VELOCITY OF THE ELECTRON FROM THE GIVEN * * ENERGY (E). * * (2) FPHI : FUNCTION TO DETERMINE THE AZIMUTHAL ANGLE PHI FORMED BY THE * * END LINE-SEGMENT OF THE TRAJECTORY OF THE ESCAPING PARTICLE. * * (3) GEOM : IT OPENS THE FILE OF COORDINATES OF THE VERTICES OF THE * * MODELLED POLYGONS OF THE SENSOR SUBSYSTEM AND THE FILE OF * * PLANE COEFFICIENTS AND INITIALISES THE ARRAYS 'COEFF'AND * * 'CHAN' WITH THE VERTICES AND THE PLANE COEFFICIENTS, RESPECTI* * -VELY. * * (4) PASSOUTPUT : IT WRITES THE POLAR AND THE AZIMUTHAL ANGLES OF THE * * ESCAPING PARTICLE AT THE DETECTOR AND AT THE APERTURE * * AND IT ALSO WRITES THE POSITION AND THE VELOCITIES OF * * THE PARTICLE AS IT ESCAPES THE APERTURE. * * (5) VELOPROJ : TO DETERMINE THE VELOCITY COMPONENTS FROM THE TOTAL VELO* * -CITY (V),POLAR ANGLE (THETA) AND THE AZIMUTHAL ANGLE (PHI).* **************************************************************************
SUBROUTINE VELOPROJ(V,VX,VY,VZ,THETA,PHI)
* PURPOSE : GIVEN THE VELOCITY, TO FIND THE COMPONENTS OF VELOCITY * * 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)
* PURPOSE : TO FIND THE RATIO OF THE VELOCITY OF THE e TO THE VELOCITY *
* OF LIGHT. I.E. TO COMPUTE V/C GIVEN THE INITIAL ENERGY OF THE ELECTRON *
* IN MEV. 2 2 *
* FORMULA USED : (V/C) = 1 - (REST MASS) *
* ---------------- 2 *
* (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
* PURPOSE: THIS SUBROUTINE OPENS THE FILES: *
* COOR*.DAT:IT CONTAINS THE COORDINATES OF ALL THE VERTICES OF ALL THE *
* PLANE SURFACES THAT THE PARTICLE IS LIKELY TO HIT *
* COEFF.DAT:IT CONTAINS THE CONSTANT COEFFICIENTS A,B,C,D OF EACH OF THE *
* PLANES THAT THE PARTILCE IS LIKELY TO HIT *
* AND IT INITIALISES THE ARRAYS: *
* CHAN:EACH ROW CORRESPONDS TO A PLANE SURFACE; *
* COL. 1:NO. OF VERTICES OF THAT PLANE POLYGON *
* COL. 2>>>COL. NVERT*3+1 :ALL THE COORDINATES OF THE VERTICES *
* COEFF:EACH ROW CORRESPONDS TO A PLANE POLYGON *
* 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=31,MAXSURF=50)
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
* PURPOSE:THIS PROGRAM OUTPUTS THE POLAR & THE AZIMUTHAL ANGLES * * OF THE ESCAPING PARTICLES ONTO A FILE. * * * * NPAS : TOTAL NO. OF PARTICLES THAT ESCAPE THE SENSOR ASSEMBLY * * PAS(I,J) : 2-D ARRAY * * I : NO. OF ESCAPING PARTICLE * * J=1: POLAR ANGLE AT THE DETECTOR * * =2: AZIMUTHAL ANGLE AT THE DETECTOR * * =3: POLAR ANGLE AT THE APERTURE * * =4: AZIMUTHAL ANGLE AT THE APERTURE * * =5-10 :X,Y,Z,Vx,Vy,Vz OF THE ESCAPING PARTICLE * **************************************************************************
IMPLICIT NONE
CHARACTER*72 FNAME1,FNAME2,FNAME3,FNAME4
INTEGER I,J
REAL*8 PASVEL(10000,2),PI,RAD
COMMON /PASVEL/PASVEL
COMMON /FNAME1/FNAME1
COMMON /FNAME4/FNAME4
COMMON /FNAME2/FNAME2,FNAME3
INCLUDE 'PASS5.CMN'
PI = 4.0D0*DATAN(1.0D0)
RAD = 180.0D0/PI
OPEN(UNIT=8,FILE=FNAME1,ACCESS='SEQUENTIAL',STATUS='OLD')
OPEN(UNIT=1,FILE=FNAME2,ACCESS='SEQUENTIAL',STATUS='OLD')
OPEN(UNIT=2,FILE=FNAME3,ACCESS='SEQUENTIAL',STATUS='OLD')
OPEN(UNIT=3,FILE=FNAME4,ACCESS='SEQUENTIAL',STATUS='OLD')
WRITE(8,*) 'NPAS:',NPAS
WRITE(8,*)
WRITE(8,20)
DO I=1,NPAS
PAS(I,3) = PAS(I,3)*RAD
PAS(I,4) = PAS(I,4)*RAD
PASVEL(I,1) = PASVEL(I,1)*RAD
PASVEL(I,2) = PASVEL(I,2)*RAD
WRITE(8,10) (PAS(I,J),J=1,10)
WRITE(1,30) PAS(I,1),PAS(I,2)
WRITE(2,30) PAS(I,3),PAS(I,4)
WRITE(3,30) PASVEL(I,1),PASVEL(I,2)
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)
30 FORMAT(2(X,F9.3))
RETURN
END
C----------------------------------------------------------------------------
C----------------------------------------------------------------------------
REAL*8 FUNCTION FPHI(XT,YT)
* PURPOSE : THIS ROUTINE DETERMINES THE AZIMUTHAL ANGLE PHI FORMED BY THE *
* LINE-SEGMENTS YT & XT. *
******************************************************************************
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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LECP Data Analysis Handbook Table of Contents.
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Updated 8/9/19, Cameron Crane
VOYAGER 1 ELAPSED TIME
--:--:--:--
Days: Hours:
Minutes: Seconds
*Since official launch
September 5, 1977, 12:56:00:00 UTC
*Since official launch
September 5, 1977, 12:56:00:00 UTC
VOYAGER 2 ELAPSED TIME
--:--:--:--
Days: Hours:
Minutes: Seconds
*Since official launch
August 20, 1977, 14:29:00:00 UTC
*Since official launch
August 20, 1977, 14:29:00:00 UTC
QUICK FACTS
Manufacturer:
Voyagers 1 and 2 were built in the Jet Propulsion
Laboratory in Southern California.
Mission Duration: 40+ years have elapsed for both Voyager 1 and Voyager 2 (both are ongoing).
Destination: Their original destinations were Saturn and Jupiter. Their current destination is interstellar space.
Mission Duration: 40+ years have elapsed for both Voyager 1 and Voyager 2 (both are ongoing).
Destination: Their original destinations were Saturn and Jupiter. Their current destination is interstellar space.