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<HTML>
<HEAD>
<TITLE>4 Circle Diffractometer Setting Calculation</TITLE>
</HEAD>
<BODY>
<H1>4 Circle Diffractometer Setting Calculation</H1>
<P>
An essential part of operating a 4 circle diffractometer is the calculation
of the setting angles for the diffractometer for a given reciprocal lattice
point from the UB matrix and the wavelength. SICS does this through the hkl
object. The hkl object can calculate the required settings both for normal 4
circle configuration and normal beam configuration. It is possible to
specify if low chi or high chi values are preferred. The wavelength can be
dealt with in two ways: it can be set manually. Or a variable controlling
the wavelength can be specified. The hkl object will then be updated
automatically with the newest value for the wavelength whenever the
wavelength changes.
</P>
<p>
The hkl object understands the following commands:
<DL>
<DT>hkl list
<DD>Prints a listing of all relevant settings calculation parameters.
<DT>hkl current
<DD>Prints the value of the last calculated reflection.
<DT>hkl lambda val
<DD>Manually sets the wavelength to val. No automatic updates of the
wavelength will be performed.
<DT>hkl lambdavar val
<DD>Sets the name of the variable controlling the wavelength. The wavelength
in the hkl object will be automatically updated whenever the wavelength is
modified by driving variable val. This is a user command because the TRICS
spectrometer has more then one monochromator.
<DT>hkl setub a11 a12 a13 a21 a22 a23 a31 a 32 a33
<DD>SetUB sets the UB matrix to the nine values given.
<DT>hkl nb val
<DD>Switches the mode for normal beam calculation. If val is 1 a normal beam
calculation is performed, else normal four circle calculations are done.
<DT>hkl quadrant val
<DD>Defines the chi quadrant to prefer. The parameter val can be 0 for low
chi and 1 for high chi.
<DT>hkl calc h1 h2 h3 psi hamil
<DD>Calculates and prints the setting angles for the reflection (h1,h2,h3).
Optionally a psi value and a hamilton position can be specified.
<DT>hkl run h1 h2 h3 psi hamil
<DD>Calculates the setting angles for the reflection (h1,h2,h3) and starts
the motors to run to that position. This command will return immediately and
will not wait for the diffractometer to arrive at the setting angles
requested.
Optionally a psi value and a hamilton position can be specified.
<DT>hkl drive h1 h2 h3 psi hamil
<DD>Calculates the setting angles for the reflection (h1,h2,h3) and starts
the motors to drive to that position. This command will wait for the
diffractometer to arrive at the setting angles requested.
Optionally a psi value and a hamilton position can be specified.
</DL>
</p>
</BODY>
</HTML>