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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2//EN">
<HTML><HEAD>
<TITLE>McStas: Source_simple Component</TITLE>
<LINK REV="made" HREF="mailto:peter.willendrup@risoe.dk">
</HEAD>
<BODY>
<P ALIGN=CENTER>
[ <A href="#id">Identification</A>
| <A href="#desc">Description</A>
| <A href="#ipar">Input parameters</A>
| <A href="#opar">Output parameters</A>
| <A href="#links">Links</A> ]
</P>
<H1>The <CODE>Source_simple</CODE> Component</H1>
A circular neutron source with flat energy spectrum and arbitrary flux
<H2><A NAME=id></A>Identification</H2>
<UL>
<LI> <B>Author:</B> Kim Lefmann</B>
<LI> <B>Origin:</B> Risoe</B>
<LI> <B>Date:</B> October 30, 1997</B>
<LI> <B>Version:</B>(Unknown)</B>
<LI> <B>Modification history:</B> <UL>
<LI> KL, October 4, 2001
<LI> Emmanuel Farhi, October 30, 2001. Serious bug corrected.
</UL>
</UL>
<H2><A NAME=desc></A>Description</H2>
<PRE>
The routine is a circular neutron source, which aims at a square target
centered at the beam (in order to improve MC-acceptance rate). The angular
divergence is then given by the dimensions of the target.
The neutron energy is uniformly distributed between lambda0-dlambda and
lambda0+dlambda or between E0-dE and E0+dE.
The flux unit is specified in n/cm2/s/st/energy unit (meV or Angs).
This component replaces Source_flat, Source_flat_lambda,
Source_flux and Source_flux_lambda.
Example: Source_simple(radius=0.1, dist=2, focus_xw=.1, focus_yh=.1, E0=14, dE=2)
</PRE>
<H2><A NAME=ipar></A>Input parameters</H2>
Parameters in <B>boldface</B> are required;
the others are optional.
<TABLE BORDER=1>
<TR><TH>Name</TH> <TH>Unit</TH> <TH>Description</TH> <TH>Default</TH></TR>
<TR> <TD>radius</TD>
<TD>m</TD>
<TD>Radius of circle in (x,y,0) plane where neutrons are generated.
</TD>
<TD ALIGN=RIGHT>0.1</TD> </TR>
<TR> <TD>yheight</TD>
<TD>m</TD>
<TD>Height of rectangle in (x,y,0) plane where neutrons are generated.
</TD>
<TD ALIGN=RIGHT>0</TD> </TR>
<TR> <TD>xwidth</TD>
<TD>m</TD>
<TD>Width of rectangle in (x,y,0) plane where neutrons are generated.
</TD>
<TD ALIGN=RIGHT>0</TD> </TR>
<TR> <TD>dist</TD>
<TD>m</TD>
<TD>Distance to target along z axis.
</TD>
<TD ALIGN=RIGHT>0</TD> </TR>
<TR> <TD>focus_xw</TD>
<TD>m</TD>
<TD>Width of target
</TD>
<TD ALIGN=RIGHT>.045</TD> </TR>
<TR> <TD>focus_yh</TD>
<TD>m</TD>
<TD>Height of target
</TD>
<TD ALIGN=RIGHT>.12</TD> </TR>
<TR> <TD>E0</TD>
<TD>meV</TD>
<TD>Mean energy of neutrons.
</TD>
<TD ALIGN=RIGHT>0</TD> </TR>
<TR> <TD>dE</TD>
<TD>meV</TD>
<TD>Energy half spread of neutrons (flat or gaussian sigma).
</TD>
<TD ALIGN=RIGHT>0</TD> </TR>
<TR> <TD>lambda0</TD>
<TD>AA</TD>
<TD>Mean wavelength of neutrons.
</TD>
<TD ALIGN=RIGHT>0</TD> </TR>
<TR> <TD>dlambda</TD>
<TD>AA</TD>
<TD>Wavelength half spread of neutrons.
</TD>
<TD ALIGN=RIGHT>0</TD> </TR>
<TR> <TD>flux</TD>
<TD>1/(s*cm**2*st*energy unit)</TD>
<TD>flux per energy unit, Angs or meV if flux=0, the source emits 1 in 4*PI whole space.
</TD>
<TD ALIGN=RIGHT>1</TD> </TR>
<TR> <TD>gauss</TD>
<TD>1</TD>
<TD>Gaussian (1) or Flat (0) energy/wavelength distribution
</TD>
<TD ALIGN=RIGHT>0</TD> </TR>
<TR> <TD>target_index</TD>
<TD>1</TD>
<TD>relative index of component to focus at, e.g. next is +1 this is used to compute 'dist' automatically.
</TD>
<TD ALIGN=RIGHT>+1</TD> </TR>
</TABLE>
<H2><A NAME=links></A>Links</H2>
<UL>
<LI> <A HREF="Source_simple.comp">Source code</A> for <CODE>Source_simple.comp</CODE>.
</UL>
<HR>
<P ALIGN=CENTER>
[ <A href="#id">Identification</A>
| <A href="#desc">Description</A>
| <A href="#ipar">Input parameters</A>
| <A href="#opar">Output parameters</A>
| <A href="#links">Links</A> ]
</P>
<ADDRESS>
Generated automatically by McDoc, Peter Willendrup
<<A HREF="mailto:peter.willendrup@risoe.dk">peter.willendrup@risoe.dk</A>> /
Thu Nov 3 15:46:32 2022</ADDRESS>
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