/******************************************************************************* * * McStas, neutron ray-tracing package * Copyright 1997-2002, All rights reserved * Risoe National Laboratory, Roskilde, Denmark * Institut Laue Langevin, Grenoble, France * * Component: Divlambda_monitor * * %I * Written by: Kristian Nielsen * Date: 1999 * Origin: Risoe * * Divergence/wavelength monitor. * * %Description * 2D detector for intensity as a function of both horizontal divergence * and wavelength. * * Example: DivLambda_monitor(nL=20, nh=20, filename="Output.div", * xmin=-0.1, xmax=0.1, ymin=-0.1, ymax=0.1, * maxdiv_h=2, Lmin=2, Lmax=10) * * %Parameters * 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. * nL: [1] Number of bins in wavelength * nh: [1] Number of bins in divergence * nx: [1] * ny: [1] Vector definition of "forward" direction wrt. divergence, to be used e.g. when the monitor is rotated into the horizontal plane. * nz: [1] * maxdiv_h: [degrees] Maximal horizontal divergence detected * Lmin: [AA] Minimum wavelength detected * Lmax: [AA] Maximum wavelength detected * 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 * * OUTPUT PARAMETERS: * * Div_N: [] Array of neutron counts * Div_p: [] Array of neutron weight counts * Div_p2: [] Array of second moments * * %End *******************************************************************************/ DEFINE COMPONENT DivLambda_monitor DEFINITION PARAMETERS () SETTING PARAMETERS (nL=20, nh=20, int nowritefile=0, string filename=0, xmin=-0.05, xmax=0.05, ymin=-0.05, ymax=0.05, xwidth=0, yheight=0, maxdiv_h=2, Lmin, Lmax, restore_neutron=0, nx=0, ny=0, nz=1) OUTPUT PARAMETERS () /* Neutron parameters: (x,y,z,vx,vy,vz,t,sx,sy,sz,p) */ DECLARE %{ DArray2d Div_N; DArray2d Div_p; DArray2d Div_p2; %} INITIALIZE %{ int i, j; if (xwidth > 0) { xmax = xwidth/2; xmin = -xmax; } if (yheight > 0) { ymax = yheight/2; ymin = -ymax; } if ((xmin >= xmax) || (ymin >= ymax)) { printf("Divlambda_monitor: %s: Null detection area !\n" "ERROR (xwidth,yheight,xmin,xmax,ymin,ymax). Exiting", NAME_CURRENT_COMP); exit(0); } Div_N = create_darr2d(nL, nh); Div_p = create_darr2d(nL, nh); Div_p2 = create_darr2d(nL, nh); for (i=0; ixmin && xymin && y Lmin && lambda < Lmax) { /* Find length of projection onto the [nx ny nz] axis */ vn = scalar_prod(vx, vy, vz, nx, ny, nz); div = RAD2DEG*atan2(vx,vn); if (div < maxdiv_h && div > -maxdiv_h) { i = floor((lambda - Lmin)*nL/(Lmax - Lmin)); j = floor((div + maxdiv_h)*nh/(2.0*maxdiv_h)); double p2 = p*p; #pragma acc atomic Div_N[i][j] = Div_N[i][j]+1; #pragma acc atomic Div_p[i][j] = Div_p[i][j]+p; #pragma acc atomic Div_p2[i][j] = Div_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 %{ if (!nowritefile) { DETECTOR_OUT_2D( "Wavelength-divergence monitor", "Wavelength [AA]", "divergence [deg]", Lmin, Lmax, -maxdiv_h, maxdiv_h, nL, nh, &Div_N[0][0],&Div_p[0][0],&Div_p2[0][0], filename); } %} FINALLY %{ destroy_darr2d(Div_N); destroy_darr2d(Div_p); destroy_darr2d(Div_p2); %} 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