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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: EPSD_monitor.comp
*
* %I
* Written by: Kim Lefmann
* Date: 16.4.00
* Origin: Risoe
*
* A monitor measuring neutron intensity vs. position, x, and neutron energy, E
*
* %D
*
* A monitor measuring neutron intensity vs. position, x, and neutron energy, E
*
* Example: EPSD_monitor(xmin=-0.1, xmax=0.1, ymin=-0.1, ymax=0.1,
* Emin=1, Emax=50, nx=20, nE=20, filename="Output.poe")
*
* %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.
* Emin: [meV] Lower bound of energy
* Emax: [meV] Upper bound of energy
* nx: [1] Number of pixel columns in scattering plane
* nE: [1] Number of energy bins
* 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 EPSD_monitor
SETTING PARAMETERS (int nx=20, int nE=20, string filename=0, xmin=-0.05, xmax=0.05, ymin=-0.05, ymax=0.05, int nowritefile=0,
xwidth=0, yheight=0, Emin, Emax, int restore_neutron=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("EPSD_monitor: %s: Null detection area !\n"
"ERROR (xwidth,yheight,xmin,xmax,ymin,ymax). Exiting",
NAME_CURRENT_COMP);
exit(0);
}
PSD_N = create_darr2d(nx, nE);
PSD_p = create_darr2d(nx, nE);
PSD_p2 = create_darr2d(nx, nE);
// 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 E,v;
PROP_Z0;
v=vx*vx+vy*vy+vz*vz;
E=VS2E*(vx*vx+vy*vy+vz*vz);
if (x>xmin && x<xmax && y>ymin && y<ymax && E>Emin && E<Emax)
{
i = floor((x - xmin)*nx/(xmax - xmin));
j = floor((E - Emin)*nE/(Emax - Emin));
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;
}
if (restore_neutron) {
RESTORE_NEUTRON(INDEX_CURRENT_COMP, x, y, z, vx, vy, vz, t, sx, sy, sz, p);
}
%}
SAVE
%{
if (!nowritefile) {
DETECTOR_OUT_2D("EPSD monitor", "Position [m]", "Energy [meV]",
xmin, xmax, Emin, Emax, nx, nE,
&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
%{
%}
END
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