/******************************************************************************* * * McStas, neutron ray-tracing package * Copyright 1997-2002, All rights reserved * Risoe National Laboratory, Roskilde, Denmark * Institut Laue Langevin, Grenoble, France * * Component: L_monitor * * %I * Written by: Kristian Nielsen and Kim Lefmann * Date: April 20, 1998 * Origin: Risoe * * Wavelength-sensitive monitor. * * %D * A square single monitor that measures the wavelength of the incoming * neutrons. * * Example: L_monitor(xmin=-0.1, xmax=0.1, ymin=-0.1, ymax=0.1, nL=20, filename="Output.L", Lmin=2, Lmax=10) * * %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. * Lmin: [AA] Minimum wavelength to detect * Lmax: [AA] Maximum wavelength to detect * nL: [1] Number of wavelength channels * 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: * * L_N: [] Array of neutron counts * L_p: [] Array of neutron weight counts * L_p2: [] Array of second moments * * %E *******************************************************************************/ DEFINE COMPONENT L_monitor DEFINITION PARAMETERS () SETTING PARAMETERS (nL=20, string filename=0, int nowritefile=0, xmin=-0.05, xmax=0.05, ymin=-0.05, ymax=0.05, xwidth=0, yheight=0, Lmin, Lmax, restore_neutron=0) OUTPUT PARAMETERS () /* Neutron parameters: (x,y,z,vx,vy,vz,t,sx,sy,sz,p) */ DECLARE %{ DArray1d L_N; DArray1d L_p; DArray1d L_p2; %} INITIALIZE %{ if (xwidth > 0) { xmax = xwidth/2; xmin = -xmax; } if (yheight > 0) { ymax = yheight/2; ymin = -ymax; } if ((xmin >= xmax) || (ymin >= ymax)) { printf("L_monitor: %s: Null detection area !\n" "ERROR (xwidth,yheight,xmin,xmax,ymin,ymax). Exiting", NAME_CURRENT_COMP); exit(0); } L_N = create_darr1d(nL); L_p = create_darr1d(nL); L_p2 = create_darr1d(nL); int i; for (i=0; ixmin && xymin && y= 0 && i < nL) { double p2 = p*p; #pragma acc atomic L_N[i] = L_N[i] +1; #pragma acc atomic L_p[i] = L_p[i] + p; #pragma acc atomic L_p2[i] = L_p2[i] + 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_1D( "Wavelength monitor", "Wavelength [AA]", "Intensity", "L", Lmin, Lmax, nL, &L_N[0],&L_p[0],&L_p2[0], filename); } %} FINALLY %{ destroy_darr1d(L_N); destroy_darr1d(L_p); destroy_darr1d(L_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