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/*******************************************************************************
*
* McXtrace, x-ray tracing package
* Copyright, All rights reserved
* DTU Physics, Kgs. Lyngby, Denmark
* Synchrotron SOLEIL, Saint-Aubin, France
*
* Component: DivPos_monitor
*
* %Identification
* Written by: Erik B Knudsen
* Based on neutron component by Kim Lefmann
* Date: Jun. 16
* Origin: DTU Physics
* Release: McXtrace 1.3
*
* Divergence/position monitor (acceptance diagram).
*
* %Description
* 2D detector for intensity as a function of both horizontal position
* and wavelength. This gives information similar to an aceptance diagram used
* eg. to investigate beam profiles in neutron guides.
*
* Example: DivPos_monitor(nh=20, ndiv=20, filename="Output.dip",
* xwidth=0.1, yheight=0.1, maxdiv_h=2)
*
* %Parameters
* INPUT PARAMETERS:
*
* xwidth: [m] Width of detector.
* yheight: [m] Height of detector.
* nh: [1] Number of bins in position
* ndiv: [1] Number of bins in divergence
* nx: [1] Vector definition of "forward" direction wrt. divergence, to be used e.g. when the monitor is rotated into the horizontal plane
* ny: [1] Vector definition of "forward" direction wrt. divergence, to be used e.g. when the monitor is rotated into the horizontal plane
* nz: [1] Vector definition of "forward" direction wrt. divergence, to be used e.g. when the monitor is rotated into the horizontal plane
* maxdiv_h: [deg] Maximal horizontal divergence detected
* filename: [str] Name of file in which to store the detector image
* restore_xray: [1] If set, the monitor does not influence the photon state
* nowritefile: [1] If set, monitor will skip writing to disk.
*
* CALCULATED PARAMETERS:
*
* Div_N: Array of photon ray counts
* Div_p: Array of photon weight counts
* Div_p2: Array of second moments
*
* %End
*******************************************************************************/
DEFINE COMPONENT DivPos_monitor
SETTING PARAMETERS (int nh=20 , int ndiv=20, string filename=0,
xwidth=0.1, yheight=0.1, maxdiv_h=2, restore_xray=0, nx=0, ny=0, nz=1, int nowritefile=0)
DECLARE
%{
DArray2d Div_N;
DArray2d Div_p;
DArray2d Div_p2;
double xmin;
double xmax;
double ymin;
double ymax;
%}
INITIALIZE
%{
int i,j;
xmax = xwidth/2; xmin = -xmax;
ymax = yheight/2; ymin = -ymax;
if ((xmin >= xmax) || (ymin >= ymax)) {
printf("DivPos_monitor: %s: Null detection area !\n"
"ERROR (xwidth,yheight,xmin,xmax,ymin,ymax). Exiting",
NAME_CURRENT_COMP);
exit(0);
}
for (i=0; i<nh; i++)
for (j=0; j<ndiv; j++)
{
Div_N[i][j] = 0;
Div_p[i][j] = 0;
Div_p2[i][j] = 0;
}
NORM(nx,ny,nz);
// Use instance name for monitor output if no input was given
if (!strcmp(filename,"\0")) sprintf(filename,"%s",NAME_CURRENT_COMP);
%}
TRACE
%{
int i,j;
double div;
double k, kn;
PROP_Z0;
if (x>xmin && x<xmax && y>ymin && y<ymax)
{
/* Find length of projection onto the [nx ny nz] axis */
kn = scalar_prod(kx, ky, kz, nx, ny, nz);
div = RAD2DEG*atan2(kx,kn);
if (div < maxdiv_h && div > -maxdiv_h)
{
i = floor((x - xmin)*nh/(xmax - xmin));
j = floor((div + maxdiv_h)*ndiv/(2.0*maxdiv_h));
Div_N[i][j]++;
Div_p[i][j] += p;
Div_p2[i][j] += p*p;
SCATTER;
}
}
if (restore_xray) {
RESTORE_XRAY(INDEX_CURRENT_COMP, x, y, z, kx, ky, kz, phi, t, Ex, Ey, Ez, p);
}
%}
SAVE
%{
if(!nowritefile){
DETECTOR_OUT_2D(
"Position-divergence monitor",
"pos [m]",
"divergence [deg]",
xmin, xmax, -maxdiv_h, maxdiv_h,
nh, ndiv,
&Div_N[0][0],&Div_p[0][0],&Div_p2[0][0],
filename);
}
%}
FINALLY
%{
destroy_darr2d(Div_N);
destroy_darr2d(Div_p);
destroy_darr2d(Div_p2);
%}
MCDISPLAY
%{
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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