/******************************************************************************* * * McStas, neutron ray-tracing package * Copyright 1997-2002, All rights reserved * Risoe National Laboratory, Roskilde, Denmark * Institut Laue Langevin, Grenoble, France * * %I * Written by: Kim Lefmann, Peter Willendrup, Linda Udby * Date: May 7, 2001 * Origin: Risoe * * Rectangular 1D PSD, measuring intensity vs. horizontal position, x * A second monitor shows the difference of intensities between in n'th and (n-1)'th pixels. * %D * * Example: PSDlin_diff_monitor(nx=20, filename="Output.x", * xmin=-0.1, xmax=0.1, ymin=-0.1, ymax=0.1) * * %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. * nx: [1] Number of x 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 * * OUTPUT PARAMETERS: * * PSDlin_diff_N: Array of neutron counts * PSDlin_diff_p: Array of neutron weight counts * PSDlin_diff_p2: Array of second moments * * %E ******************************************************************************/ DEFINE COMPONENT PSDlin_diff_monitor DEFINITION PARAMETERS () SETTING PARAMETERS (nx=20, string filename=0, xmin=-0.05, xmax=0.05, ymin=-0.05, ymax=0.05, int nowritefile=0, xwidth=0, yheight=0, restore_neutron=0) OUTPUT PARAMETERS () /* Neutron parameters: (x,y,z,vx,vy,vz,t,sx,sy,sz,p) */ DECLARE %{ DArray1d PSDlin_N; DArray1d PSDlin_p; DArray1d PSDlin_p2; DArray1d PSDdiff_N; DArray1d PSDdiff_p; DArray1d PSDdiff_p2; char difilename[128]; %} INITIALIZE %{ if (xwidth > 0) { xmax = xwidth/2; xmin = -xmax; } if (yheight > 0) { ymax = yheight/2; ymin = -ymax; } if ((xmin >= xmax) || (ymin >= ymax)) { printf("PSDlin_monitor: %s: Null detection area !\n" "ERROR (xwidth,yheight,xmin,xmax,ymin,ymax). Exiting", NAME_CURRENT_COMP); exit(0); } PSDlin_N = create_darr1d(nx); PSDlin_p = create_darr1d(nx); PSDlin_p2 = create_darr1d(nx); PSDdiff_N = create_darr1d(nx-1); PSDdiff_p = create_darr1d(nx-1); PSDdiff_p2 = create_darr1d(nx-1); // Use instance name for monitor output if no input was given if (!strcmp(filename,"\0")) sprintf(filename,NAME_CURRENT_COMP); sprintf(difilename,"%s_diff",filename); %} TRACE %{ int i; PROP_Z0; if (x>xmin && xymin && y