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/*******************************************************************************
*
* McStas, neutron ray-tracing package
* Copyright 1997-2002, All rights reserved
* Risoe National Laboratory, Roskilde, Denmark
* Institut Laue Langevin, Grenoble, France
*
* Component: PSD_Pol_monitor
*
* %I
* Written by: Alexander Backs, based on PSD_monitor by K. Lefmann
* Date: 2022
* Origin: ESS
*
* Position-sensitive monitor.
*
* %D
* An (n times m) pixel PSD monitor, measuring local polarisation as function of x,y coordinates.
*
* Example: PSD_Pol_monitor(xmin=-0.1, xmax=0.1, ymin=-0.1, ymax=0.1, nx=90, ny=90, my=1, filename="Output.psd")
*
* %P
* INPUT PARAMETERS:
*
* xmin: [m] Lower x bound of detector opening
* xmax: [m] Upper x bound of detector opening
* ymin: [m] Lower y bound of detector opening
* ymax: [m] Upper y bound of detector opening
* xwidth: [m] Width of detector. Overrides xmin, xmax
* yheight: [m] Height of detector. Overrides ymin, ymax
* nx: [1] Number of pixel columns
* ny: [1] Number of pixel rows
* filename: [string] Name of file in which to store the detector image
* restore_neutron: [1] If set, the monitor does not influence the neutron state
* nowritefile: [1] If set, monitor will skip writing to disk
* mx: [1] Define the projection axis along which the polarizatoin is evaluated, x-component
* my: [1] Define the projection axis along which the polarizatoin is evaluated, y-component
* mz: [1] Define the projection axis along which the polarizatoin is evaluated, z-component
*
* CALCULATED PARAMETERS:
*
* PSDpol_N: [] Array of neutron counts
* PSDpol_p: [] Array of neutron weighted polarization
* PSDpol_p2: [] Array of standard deviation of weighted polarization
*
* %E
*******************************************************************************/
DEFINE COMPONENT PSD_Pol_monitor
SETTING PARAMETERS (int nx=90, int ny=90, string filename=0,
xmin=-0.05, xmax=0.05, ymin=-0.05, ymax=0.05, xwidth=0, yheight=0,
restore_neutron=0, int nowritefile=0,
mx=0, my=0, mz=0)
SHARE %{
%}
DECLARE
%{
DArray2d PSDpol_N;
DArray2d PSDpol_p;
DArray2d PSDpol_p2;
DArray2d PSDpsum;
char titlestring[128];
%}
INITIALIZE
%{
// Check that input parameteters makes sense
if (mx==0 && my==0 && mz==0) {
fprintf(stderr, "Pol_monitor: %s: NULL vector defined!\n"
"ERROR (mx, my, mz). Exiting",
NAME_CURRENT_COMP);
exit(1);
}
if (xwidth > 0) { xmax = xwidth/2; xmin = -xmax; }
if (yheight > 0) { ymax = yheight/2; ymin = -ymax; }
if ((xmin >= xmax) || (ymin >= ymax)){
printf("PSD_monitor: %s: Null detection area !\n"
"ERROR (xwidth,yheight,xmin,xmax,ymin,ymax). Exiting",
NAME_CURRENT_COMP);
exit(-1);
}
sprintf(titlestring, "Polarisation monitor m=(%g %g %g) %s", mx, my, mz, NAME_CURRENT_COMP);
NORM(mx, my, mz);
PSDpol_N = create_darr2d(nx, ny);
PSDpol_p = create_darr2d(nx, ny);
PSDpol_p2 = create_darr2d(nx, ny);
PSDpsum = create_darr2d(nx,ny);
// Use instance name for monitor output if no input was given
if (!strcmp(filename,"\0")) sprintf(filename,"%s",NAME_CURRENT_COMP);
%}
TRACE
%{
PROP_Z0;
double pol_proj = mx*sx + my*sy + mz*sz; //scalar_prod(mx, my, mz, sx, sy, sz);
if(fabs(pol_proj)>1) {
if (fabs(pol_proj)<1+FLT_EPSILON){
pol_proj /= fabs(pol_proj);
}
else{
ABSORB;
}
}
if (x>xmin && x<xmax && y>ymin && y<ymax){
int i = floor((x - xmin)*nx/(xmax - xmin));
int j = floor((y - ymin)*ny/(ymax - ymin));
double ppol = p*pol_proj;
double ppol2 = ppol*pol_proj;
PSDpol_N[i][j] += 1;
PSDpol_p[i][j] += ppol;
PSDpol_p2[i][j] += ppol2;
PSDpsum[i][j] += p;
SCATTER;
}
if (restore_neutron) {
RESTORE_NEUTRON(INDEX_CURRENT_COMP, x, y, z, vx, vy, vz, t, sx, sy, sz, p);
}
%}
SAVE
%{
#ifdef USE_MPI
if (mpi_node_count>1) {
mc_MPI_Sum(&PSDpol_p[0][0], (int)nx*ny);
mc_MPI_Sum(&PSDpol_p2[0][0], (int)nx*ny);
mc_MPI_Sum(&PSDpol_N[0][0], (int)nx*ny);
mc_MPI_Sum(&PSDpsum[0][0], (int)nx*ny);
}
#endif /* USE_MPI */
if (!nowritefile) {
for (int i=0;i<nx;i++){
for (int j=0;j<ny;j++){
if (PSDpsum[i][j] && PSDpol_N[i][j]){
PSDpol_p[i][j] /= PSDpsum[i][j];
PSDpol_p2[i][j] /= PSDpsum[i][j];
}
}
}
DETECTOR_OUT_2D(
"PSD Pol monitor",
"X position [cm]",
"Y position [cm]",
xmin*100.0, xmax*100.0, ymin*100.0, ymax*100.0,
nx, ny,
&PSDpol_N[0][0],&PSDpol_p[0][0],&PSDpol_p2[0][0],
filename);
}
%}
FINALLY
%{
destroy_darr2d(PSDpol_N);
destroy_darr2d(PSDpol_p);
destroy_darr2d(PSDpol_p2);
destroy_darr2d(PSDpsum);
%}
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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