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*DECK XELTSA
SUBROUTINE XELTSA(NDIM,ITYPBC,ABSC,INDC,DENS,ANGTSA)
*
*-----------------------------------------------------------------------
*
*Purpose:
* To compute the integration points and periodic density
* for cyclic tracking.
*
*Copyright:
* Copyright (C) 1994 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
*
*Parameters: input
* NDIM number of dimensions for the problem.
* ITYPBC type of boundary condition (=0/2: Cartesian/hexagonal).
* ABSC multidimensional width of the cell.
* INDC index of each coordinate of the angles.
*
*Parameters: output
* DENS effective periodic density.
* ANGTSA tracking direction and its normal.
*
*Reference:
* R. Roy, G. Marleau, A. Hebert and D. Rozon,
* A Cyclic Tracking Procedure for Collision Probability Calculations
* in 2-D Lattice', Advances in Mathematics, Computations and
* Reactor Physics, Pittsburgh, PA, April 28 - May 2 (1991).
*
*-----------------------------------------------------------------------
*
IMPLICIT NONE
*----
* SUBROUTINE ARGUMENTS
*----
INTEGER NDIM,ITYPBC
DOUBLE PRECISION ABSC(2)
INTEGER INDC(NDIM)
DOUBLE PRECISION DENS
DOUBLE PRECISION ANGTSA(NDIM,NDIM)
*----
* LOCAL PARAMETERS
*----
INTEGER IOUT
CHARACTER NAMSBR*6
PARAMETER (IOUT=6,NAMSBR='XELTSA')
*----
* LOCAL VARIABLES
*----
INTEGER IDIM
IF(NDIM .NE. 2) CALL XABORT(NAMSBR//
>': Only 2-D problems permitted yet')
DENS=0.0D0
DO 10 IDIM= 1,NDIM
IF(ITYPBC.EQ.0) THEN
! Cartesian boundary
ANGTSA(IDIM,1)= REAL(INDC(IDIM))/ABSC(NDIM+1-IDIM)
ELSE
! hexagonal boundary
IF(IDIM.EQ.1) THEN
ANGTSA(IDIM,1)= REAL(INDC(IDIM))*SQRT(3.D0)
ELSE
ANGTSA(IDIM,1)= REAL(INDC(IDIM))
ENDIF
ENDIF
DENS= DENS + ANGTSA(IDIM,1)*ANGTSA(IDIM,1)
10 CONTINUE
DENS= SQRT(DENS)
*----
* ANGTSA(*,1) is the track direction
*----
DO 20 IDIM= 1,NDIM
ANGTSA(IDIM,1)= ANGTSA(IDIM,1)/DENS
20 CONTINUE
*----
* ANGTSA(*,2) is a normal to track direction
*----
ANGTSA(2,2)= -ANGTSA(1,1)
ANGTSA(1,2)= ANGTSA(2,1)
*----
* Processing finished, return
*----
RETURN
END
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