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*DECK MOCDDFS
SUBROUTINE MOCDDFS(N,NREG,NSOUT,M,NOM,NZON,H,SIGANG,EXPT,EXP2,
1 NMU,ZMU)
*
*-----------------------------------------------------------------------
*
*Purpose:
* Calculate coefficients of a track for the cyclic characteristics
* integration: Diamond-Differencing scheme without fix-up and
* 'source term isolation' option turned off.
*
*Copyright:
* Copyright (C) 2002 Ecole Polytechnique de Montreal
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version
*
*Author(s): R. Roy and R. Le Tellier
*
*Parameters: input
* N number of elements in the current track.
* NREG number of volumes.
* NSOUT number of surfaces.
* M number of material mixtures.
* NOM vector containing the region number of the different segments
* of this track.
* NZON index-number of the mixture type assigned to each volume.
* H vector containing the lenght of the different segments of this
* track.
* SIGANG macroscopic total cross sections and albedos.
* NMU order of the polar quadrature set.
* ZMU inverse of polar quadrature cosines.
*
*Parameters: output
* EXPT track coefficient.
* EXP2 quadratic expansion of (1-exp(-a*L))/L with small argument.
*
*-----------------------------------------------------------------------
*
IMPLICIT NONE
*----
* SUBROUTINE ARGUMENTS
*----
INTEGER N,NREG,NSOUT,M,NOM(N),NZON(-NSOUT:NREG),NMU
REAL SIGANG(-6:M),ZMU(NMU)
DOUBLE PRECISION H(N),EXPT(NMU,N),EXP2(2,NMU,N)
*----
* LOCAL VARIABLES
*----
INTEGER I,NOMI,NUMOLD,NZI,IMU
DOUBLE PRECISION HID,TAUD,TEMP,TEMP2
*
NUMOLD=NOM(1)
DO I=1,N
NOMI=NOM(I)
NZI=NZON(NOMI)
IF (NZI.LT.0) THEN
IF (NUMOLD.NE.NOMI) THEN
DO IMU=1,NMU
EXP2(1,IMU,I)=SIGANG(NZI)
EXPT(IMU,I)=EXP2(1,IMU,I)
ENDDO
ELSE
DO IMU=1,NMU
EXP2(1,IMU,I)=1.D0
EXPT(IMU,I)=EXP2(1,IMU,I)
ENDDO
ENDIF
ELSE
DO IMU=1,NMU
HID=DBLE(H(I)*ZMU(IMU))
TAUD=SIGANG(NZI)*HID
TEMP=1.D0/(2.D0+TAUD)
TEMP2=TEMP+TEMP
EXPT(IMU,I)=TEMP2-TAUD*TEMP
EXP2(1,IMU,I)=TEMP2*HID
EXP2(2,IMU,I)=HID*HID*TEMP
ENDDO
ENDIF
NUMOLD=NOMI
ENDDO
*
RETURN
END
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