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/******************************************************************************* | ||
* | ||
* McXtrace, x-ray tracing package | ||
* Copyright, All rights reserved | ||
* DTU Physics, Kgs. Lyngby, Denmark | ||
* Synchrotron SOLEIL, Saint-Aubin, France | ||
* | ||
* Component: Collimator_linear | ||
* | ||
* %I | ||
* Written by: Peter Willendrup | ||
* Date: October 2024 | ||
* Origin: DTU | ||
* Modified by: Peter Willendrup from McStas Collimator_linear from Krisitan Nielsen | ||
* | ||
* A simple analytical Soller collimator (with triangular transmission). | ||
* | ||
* %D | ||
* Soller collimator with rectangular opening and specified length. The | ||
* transmission function is an average and does not utilize knowledge of the | ||
* actual neutron trajectory. A zero divergence disables collimation (then the | ||
* component works as a double slit). | ||
* | ||
* Example: Collimator_linear(xmin=-0.1, xmax=0.1, ymin=-0.1, ymax=0.1, length=0.25, divergence=40,transmission=0.7) | ||
* | ||
* %P | ||
* INPUT PARAMETERS: | ||
* | ||
* xmin: [m] Lower x bound on slits | ||
* xmax: [m] Upper x bound on slits | ||
* ymin: [m] Lower y bound on slits | ||
* ymax: [m] Upper y bound on slits | ||
* xwidth: [m] Width of slits | ||
* yheight: [m] Height of slits | ||
* length: [m] Distance between input and output slits | ||
* divergence: [minutes of arc] Divergence horizontal angle (calculated as atan(d/length), where d is the blade spacing) | ||
* transmission: [1] Transmission of Soller (0<=t<=1) | ||
* divergenceV: [minutes of arc] Divergence vertical angle | ||
* | ||
* %E | ||
*******************************************************************************/ | ||
DEFINE COMPONENT Collimator_linear | ||
DEFINITION PARAMETERS () | ||
SETTING PARAMETERS (xmin=-0.01, xmax=0.01, ymin=-0.025, ymax=0.025, xwidth=0, yheight=0, length=0.1, divergence=10, transmission=1, divergenceV=0) | ||
OUTPUT PARAMETERS () | ||
/* X-ray parameters: (x,y,z,kx,ky,kz,phi,t,Ex,Ey,Ez,p) */ | ||
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DECLARE | ||
%{ | ||
double slope; | ||
double slopeV; | ||
%} | ||
INITIALIZE | ||
%{ | ||
slope = tan(MIN2RAD*divergence); | ||
slopeV= tan(MIN2RAD*divergenceV); | ||
if (xwidth > 0) { xmax = xwidth/2; xmin = -xmax; } | ||
if (yheight > 0) { ymax = yheight/2; ymin = -ymax; } | ||
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if ((xmin >= xmax) || (ymin >= ymax)) { | ||
printf("Collimator_linear: %s: Null slit opening area !\n" | ||
"ERROR (xwidth,yheight,xmin,xmax,ymin,ymax). Exiting", | ||
NAME_CURRENT_COMP); | ||
exit(0); | ||
} | ||
%} | ||
TRACE | ||
%{ | ||
double Phi, dl; | ||
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PROP_Z0; | ||
if (x<xmin || x>xmax || y<ymin || y>ymax) | ||
ABSORB; | ||
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double dirx,diry,dirz; | ||
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/* Use direction vector z-component to decide needed propagation length */ | ||
dirx=kx;diry=ky;dirz=kz; | ||
NORM(dirx,diry,dirz); | ||
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PROP_DL(length/dirz); | ||
if (x<xmin || x>xmax || y<ymin || y>ymax) | ||
ABSORB; | ||
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if(slope > 0.0) | ||
{ | ||
Phi = fabs(kx/kz); | ||
if (Phi > slope) | ||
ABSORB; | ||
else | ||
p *= transmission*(1.0 - Phi/slope); | ||
SCATTER; | ||
} | ||
if (slopeV > 0) { | ||
Phi = fabs(ky/kz); | ||
if (Phi > slopeV) | ||
ABSORB; | ||
else | ||
p *= transmission*(1.0 - Phi/slopeV); | ||
SCATTER; | ||
} | ||
%} | ||
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MCDISPLAY | ||
%{ | ||
double x; | ||
int i; | ||
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for(x = xmin, i = 0; i <= 10; i++, x += (xmax - xmin)/10.0) | ||
multiline(5, x, (double)ymin, 0.0, x, (double)ymax, 0.0, | ||
x, (double)ymax, (double)length, x, (double)ymin, (double)length, | ||
x, (double)ymin, 0.0); | ||
line(xmin, ymin, 0, xmax, ymin, 0); | ||
line(xmin, ymax, 0, xmax, ymax, 0); | ||
line(xmin, ymin, length, xmax, ymin, length); | ||
line(xmin, ymax, length, xmax, ymax, length); | ||
%} | ||
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END |