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<HTML>
<HEAD>
<TITLE>Wavelength adjustment for a Velocity Selector</TITLE>
</HEAD>
<BODY>
<H1>Wavelength adjustment for a Velocity Selector</H1>
<P>
The wavelength selected by a neutron velocity selector depends on the tilt
angle of the selector and its rotation speed. This is what the velocity
selector wavelength command is for. It is usually installed into the system
as lambda. This variable can be driven using the normal <a href="drive.htm">
drive and run </a> commands. Additionally this command understands a few sub
commands. For the following discussion is assumed that the name of the
command is lambda.
<dl>
<DT>lambda
<DD>The name of the variable alone prints the current wavelength in nm.
<DT>lambda rot val
<DD>calculates the rotation speed for the wavelength given by val.
<DT>lambda wl val
<DD>calculates the wavlength for the rotation speed given as parameter val.
</dl>
</P>
</BODY>
</HTML>