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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: NPI_tof_theta_monitor
*
* %I
* Written by: Kim Lefmann
* Date: October 2000
* Version: $Revision: 1.1 $
* Origin: Risoe
* Release: McStas 1.6
* Modified by: Kim Lefmann, October 9, 2001
* Modified by: J Navrátil (NPI Řež), December 10, 2015
*
* Cylindrical (2pi) PSD Time-of-flight monitor.
*
* %D
* Derived from TOF_cylPSD_monitor.
* Code is extended by the option allowing to define range of scattering angles, therefore creating only a part of the cylinder surface.
* The plot is transposed when compared to TOF_cylPSD_monitor: scattering angles are on the horizontal axis.
*
*
* Example: TOF_cylPSD_monitor_NPI(nt = 1024, nphi = 960, filename = "Output.dat",
* radius = 2, yheight = 1.0, tmin = 3e4, tmax = 12e4, amin = 75, amax = 105, restore_neutron = 1)
*
* %P
* INPUT PARAMETERS:
*
* Inherited from NPI_tof_theta_monitor:
* radius: Cylinder radius (m)
* yheight: Cylinder height (m)
* nt: Number of time bins (1)
* tmin: Beginning of time window (mu-s)
* tmax: End of time window (mu-s)
* nphi: Number of angular bins (deg)
* amin: minimum angle to detect (deg)
* amax: maximum angle to detect (deg)
* filename: Name of file in which to store the detector image (text)
* restore_neutron: If set, the monitor does not influence the neutron state (1)
*
* Newly added
* amin: [deg] minimum of scattering angle to be detected
* amax: [deg] maximum of scattering angle to be detected
*
* CALCULATED PARAMETERS:
*
* TOF_N: Array of neutron counts
* TOF_p: Array of neutron weight counts
* TOF_p2: Array of second moments
*
* %E
*******************************************************************************/
DEFINE COMPONENT NPI_tof_theta_monitor
SETTING PARAMETERS (string filename=0, radius=1, yheight=0.3, tmin, tmax, amin, amax, restore_neutron=1, verbose=0, int nt=128, int na=90)
/* Neutron parameters: (x,y,z,vx,vy,vz,t,sx,sy,sz,p) */
SHARE
%{
%}
DECLARE
%{
DArray2d TOF_N;
DArray2d TOF_p;
DArray2d TOF_p2;
double th2_min;
double th2_max;
double dth;
double dtof;
double tt_0;
double tt_1;
%}
INITIALIZE
%{
th2_min = amin*DEG2RAD;
th2_max = amax*DEG2RAD;
dth=(th2_max-th2_min)/na;
tt_0=tmin*1e-6;
tt_1=tmax*1e-6;
dtof=(tt_1-tt_0)/nt;
TOF_N = create_darr2d(na, nt);
TOF_p = create_darr2d(na, nt);
TOF_p2 = create_darr2d(na, nt);
if (verbose) {
printf("%s: range 2theta=(%g,%g), time(%g,%g)\n",NAME_CURRENT_COMP,amin,amax,tmin/1000,tmax/1000);
}
// 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 t0,t1,theta2;
double cos2;
int cross=cylinder_intersect(&t0, &t1, x, y, z, vx, vy, vz, radius, yheight);
/* don't allow intersections with top/bottom cylinder walls
only neutrons from inside are allowed
*/
if ( (cross!=1) || (t0>0) || (t1<0) ) {
p=0;
} else {
PROP_DT(t1);
/* Calculate pixel */
if (fabs(y)<(0.5*yheight)) {
cos2=z/sqrt(radius*radius+y*y);
theta2=acos(cos2);
if (theta2>th2_min && theta2< th2_max) {
i = (int)floor((theta2-th2_min)/dth+0.5);
j = (int)floor((t-tt_0)/dtof+0.5);
if ( j>=0 && j<nt && i>=0 && i<na ) {
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;
} else {
}
}
}
}
if (restore_neutron) {
RESTORE_NEUTRON(INDEX_CURRENT_COMP, x, y, z, vx, vy, vz, t, sx, sy, sz, p);
}
%}
SAVE
%{
DETECTOR_OUT_2D(
"Cylindrical monitor ToF x 2theta",
"Scattering angle [deg]",
"Time-of-flight [\\gms]",
amin, amax, tmin, tmax,
na, nt,
&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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