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/*******************************************************************************
*
* McXtrace, x-ray tracing package
* Copyright, All rights reserved
* DTU Physics, Kgs. Lyngby, Denmark
* Synchrotron SOLEIL, Saint-Aubin, France
*
* Component: Beamstop
*
* %Identification
*
* Written by: Kristian Nielsen
* Modified by Erik Bergbäck Knudsen
* Date: March 2011
* Release: McXtrace 1.0rc1
* Origin: Risoe
*
* Rectangular/circular beam stop.
*
* %Description
* A simple rectangular or circular beam stop.
* Infinitely thin and infinitely absorbing.
* The beam stop is by default rectangular. You may either
* specify the radius (circular shape), or the rectangular bounds.
*
* Example: Beamstop(xmin=-0.05, xmax=0.05, ymin=-0.05, ymax=0.05)
* Beamstop(radius=0.1)
*
* %Parameters
*
* INPUT PARAMETERS
*
* radius: [m] Radius of the beam stop in the z=0 plane, centered at Origo
* xmin: [m] Lower x bound
* xmax: [m] Upper x bound
* ymin: [m] Lower y bound
* ymax: [m] Upper y bound
* xwidth: [m] Width of beamstop (x). Overrides xmin,xmax.
* yheight:[m] Height of beamstop (y). Overrides ymin,ymax.
*
* %END
*******************************************************************************/
DEFINE COMPONENT Beamstop
SETTING PARAMETERS (xmin=-0.05, xmax=0.05, ymin=-0.05, ymax=0.05,
xwidth=0, yheight=0, radius=0)
/* X-ray parameters: (x,y,z,kx,ky,kz,phi,t,Ex,Ey,Ez,p) */
INITIALIZE
%{
if (xwidth > 0) { xmax = xwidth/2; xmin = -xmax; }
if (yheight > 0) { ymax = yheight/2; ymin = -ymax; }
if (xmin == 0 && xmax == 0 && ymin == 0 & ymax == 0 && radius == 0)
{ fprintf(stderr,"Beamstop: %s: Error: give geometry\n", NAME_CURRENT_COMP); exit(-1); }
%}
TRACE
%{
double dz,z0=z;
ALLOW_BACKPROP;
PROP_Z0;
dz=z-z0;/*dz<0 means photon must travel backwards to hit beamstop*/
if ( ((dz>=0) && ((radius!=0) && (x*x + y*y <= radius*radius)))
|| ((dz>=0) && (radius==0) && (x>xmin && x<xmax && y>ymin && y<ymax)) ){
ABSORB;
} else {
RESTORE_XRAY(INDEX_CURRENT_COMP, x, y, z, kx, ky, kz, phi, t, Ex, Ey, Ez, p);
}
%}
MCDISPLAY
%{
if (radius != 0)
circle("xy", 0, 0, 0, radius);
else
multiline(5, (double)xmin, (double)ymin, 0.0,
(double)xmax, (double)ymin, 0.0,
(double)xmax, (double)ymax, 0.0,
(double)xmin, (double)ymax, 0.0,
(double)xmin, (double)ymin, 0.0);
%}
END
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