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/*******************************************************************************
*
* McStas, neutron ray-tracing package
* Copyright 1997-2024, All rights reserved
* Technical University of Denmark, Kongens Lyngby, Denmark
* Institut Laue Langevin, Grenoble, France
*
* Component: PSD_spinUmon
*
* %I
* Written by: Michael Schneider (SNAG)
* Date: 2024
* Origin: SNAG
*
* Position-sensitive monitor, measuring the spin-up component of the neutron beam.
*
* %D
* An (n times m) pixel PSD monitor, measuring the spin-up component of the neutron beam.
*
* Example: PSD_monitor(xmin=-0.1, xmax=0.1, ymin=-0.1, ymax=0.1, nx=90, ny=90, 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
*
* CALCULATED PARAMETERS:
*
* PSD_N: [] Array of neutron counts
* PSD_p: [] Array of neutron weight counts
* PSD_p2: [] Array of second moments
*
* %E
*******************************************************************************/
DEFINE COMPONENT PSD_spinUmon
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,
int restore_neutron=0, int nowritefile=0)
/* Neutron parameters: (x,y,z,vx,vy,vz,t,sx,sy,sz,p) */
DECLARE
%{
DArray2d PSD_N;
DArray2d PSD_p;
DArray2d PSD_p2;
%}
INITIALIZE
%{
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(0);
}
PSD_N = create_darr2d(nx, ny);
PSD_p = create_darr2d(nx, ny);
PSD_p2 = 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
%{
int i,j;
if (sy < 0)
{SCATTER;}
else
{
PROP_Z0;
if (x>xmin && x<xmax && y>ymin && y<ymax)
{
i = floor((x - xmin)*nx/(xmax - xmin));
j = floor((y - ymin)*ny/(ymax - ymin));
double p2 = p*p;
#pragma acc atomic
PSD_N[i][j] = PSD_N[i][j] +1;
#pragma acc atomic
PSD_p[i][j] = PSD_p[i][j] + p;
#pragma acc atomic
PSD_p2[i][j] = PSD_p2[i][j] + p2;
SCATTER;
}
if (restore_neutron) {
RESTORE_NEUTRON(INDEX_CURRENT_COMP, x, y, z, vx, vy, vz, t, sx, sy, sz, p);
}
}
%}
SAVE
%{
DETECTOR_OUT_2D(
"PSD monitor",
"X position [cm]",
"Y position [cm]",
xmin*100.0, xmax*100.0, ymin*100.0, ymax*100.0,
nx, ny,
&PSD_N[0][0],&PSD_p[0][0],&PSD_p2[0][0],
filename);
%}
FINALLY %{
destroy_darr2d(PSD_N);
destroy_darr2d(PSD_p);
destroy_darr2d(PSD_p2);
%}
MCDISPLAY
%{
magnify("xy");
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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