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