/******************************************************************************* * McXtrace instrument definition URL=http://www.mcxtrace.org * * Instrument: template_1Slit_Diff * * %Identification * Written by: Erik B Knudsen (erkn@fysik.dtu.dk) * Date: Jan 2014 * Origin: DTU Physics * Release: McXtrace 1.2 * Version: 1.0 * %INSTRUMENT_SITE: Templates * * An example instrument showing single slit diffraction * * %Description * A template instrument that shows how single slit diffraction works. * The slit is positioned 1m downstream from a point source. The slit * width may be varied. The slit height is set to .8e-6 m. * * %Example: template_1Slit_Diff SLITW=5e-6 * * %Parameters * SLITW: [m] Width of the slit in question. The * * %End *******************************************************************************/ /* Change name of instrument and input parameters with default values */ DEFINE INSTRUMENT template_1Slit_Diff(SLITW=5e-6) /* The DECLARE section allows us to declare variables or small */ /* functions in C syntax. These may be used in the whole instrument. */ DECLARE %{ %} /* The INITIALIZE section is executed when the simulation starts */ /* (C code). You may use them as component parameter values. */ INITIALIZE %{ %} /* Here comes the TRACE section, where the actual */ /* instrument is defined as a sequence of components. */ TRACE /* The Arm() class component defines reference points and orientations */ /* in 3D space. Every component instance must have a unique name. Here, */ /* Origin is used. This Arm() component is set to define the origin of */ /* our global coordinate system (AT (0,0,0) ABSOLUTE). It may be used */ /* for further RELATIVE reference, Other useful keywords are : ROTATED */ /* EXTEND GROUP PREVIOUS. Also think about adding an xray source ! */ /* Progress_bar is an Arm displaying simulation progress. */ COMPONENT Origin = Progress_bar() AT (0,0,0) ABSOLUTE COMPONENT source=Source_pt( focus_xw=6e-6, focus_yh=0.8e-6, dist=1, lambda0=2.0, dE=0, gauss=1, randomphase=0) AT(0,0,0) RELATIVE Origin COMPONENT s1 = Slit( xwidth=SLITW, yheight=0.8e-6, dist=1, focus_xw=200e-6,focus_yh=2e-6, focus_x0=0.0,focus_y0=0.0 ) AT(0,0,1) RELATIVE source GROUP slits COMPONENT psd0 = PSD_monitor_coh( yheight=2e-6, xwidth=200e-6, nx=501, ny=1, filename="psd0") AT(0,0,2) RELATIVE source /* This section is executed when the simulation ends (C code). Other */ /* optional sections are : SAVE */ FINALLY %{ %} /* The END token marks the instrument definition end */ END