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/*******************************************************************************
*
* McStas, neutron ray-tracing package
* Copyright (C) 1997-2011, All rights reserved
* Risoe National Laboratory, Roskilde, Denmark
* Institut Laue Langevin, Grenoble, France
*
* Component: TOF2Q_cylPSD_monitor
*
* %I
* Written by: Anette Vickery, derived from Lefmann TOF_cylPSD
* Date: October 2000
* Origin: Risoe
* Modified by: Anette Vickery, October 9, 2012
*
* Cylindrical (2pi) Time-of-flight to Q monitor.
* Calculates Q from TOF and known nominal grazing angle theta:
* E = VS2E*(L_flight/(t-T_zero))*(L_flight/(t-T_zero));
* Q=2*sqrt(E/2.072)*sin(theta);
*
* %D
*
* %P
* INPUT PARAMETERS:
*
* radius: [m] Cylinder radius
* yheight: [m] Cylinder height
* nQ: [1] Number of Q bins
* ny: [1] Number of y bins
* yheight: [m] Height of cylinder
* ymin: [m] Minimum value of y monitored
* ymax: [m] Maximum value of y monitored
* Qmin: [] Beginning of Q-range
* Qmax: [] End of Q-range
* T_zero: [s] Beginning of time window
* L_flight: [] Nominal flightpath moderator--detector
* theta: [] Nominal grazing angle
* 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:
*
* TOF_N: [] Array of neutron counts
* TOF_p: [] Array of neutron weight counts
* TOF_p2: [] Array of second moments
*
* %E
*******************************************************************************/
DEFINE COMPONENT TOF2Q_cylPSD_monitor
SETTING PARAMETERS (int nQ, int ny, string filename=0, int nowritefile=0, radius, yheight, Qmin, Qmax, ymin=0, ymax=0, T_zero, L_flight, int restore_neutron=0,theta)
DECLARE
%{
DArray2d TOF_N;
DArray2d TOF_p;
DArray2d TOF_p2;
%}
INITIALIZE
%{
int i,j;
TOF_N = create_darr2d(nQ, ny);
TOF_p = create_darr2d(nQ, ny);
TOF_p2 = create_darr2d(nQ, ny);
if (yheight > 0) { ymax = yheight/2; ymin = -ymax; }
// 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 cyl_t0, cyl_t1, dt, phi;
double E, Q;
if(!cylinder_intersect(&cyl_t0, &cyl_t1, x,y,z,vx,vy,vz, radius, yheight))
/* No hit */
ABSORB;
if(cyl_t0>0) /* Neutron hits cylinder from the outside */
ABSORB;
dt = cyl_t1;
PROP_DT(dt);
if(y>=yheight/2 || y<= -yheight/2)
ABSORB; /* Neutron hits cylinder ends; no detectors here */
E = VS2E*(L_flight/(t-T_zero))*(L_flight/(t-T_zero));
j = floor((y - ymin)*ny/(ymax - ymin));
Q=2*sqrt(E/2.072)*sin(theta);
i = floor((Q-Qmin)*nQ/(Qmax-Qmin));
if (i>=0 && i<nQ && j>=0 && j<ny) {
double p2 = p*p;
#pragma acc atomic
TOF_N[i][j] = TOF_N[i][j]+1;
#pragma acc atomic
TOF_p[i][j] = TOF_p[i][j]+p;
#pragma acc atomic
TOF_p2[i][j] = TOF_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(
"Cylindrical TOF2E PSD monitor",
"TOF2Q [Ang^-1]",
"Y position [cm]",
Qmin, Qmax, ymin*100.0, ymax*100.0,
nQ, ny,
&TOF_N[0][0],&TOF_p[0][0],&TOF_p2[0][0],
filename);
}
%}
FINALLY
%{
destroy_darr2d(TOF_N);
destroy_darr2d(TOF_p);
destroy_darr2d(TOF_p2);
%}
MCDISPLAY
%{
magnify("y");
circle("xz", 0,0,0,radius);
%}
END
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