48 lines
2.0 KiB
HTML
48 lines
2.0 KiB
HTML
<HTML>
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<HEAD>
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<TITLE>Hklscan</TITLE>
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</HEAD>
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<BODY>
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<H1>Hklscan and Hklscan2d (Obsolete)</H1>
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<P>
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Hklscan is a command which allows to scan in reciprocal space expressed as
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Miller indizes on a four circle diffractometer. Hklscan operates with
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a single detector. Hklscan2d does the same as hklscan but for the
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position sensitive detectors, saving data into NeXus files. Hklscan
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and Hklscan2d share the same syntax.
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Prerequisite for this is
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the existence of a scan object and the hkl-object for doing crystallographic
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calculations. Make sure the properties of the hkl object (UB, wavelength, NB)
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have some reasonable relation to reality, otherwise the diffractometer may
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travel to nowhere. Also it is a good idea to drive the diffractometer to the
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end points of the intended scan in reciprocal space. hklscan will abort if
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the requested scan violates diffractometer limits. The commands implemented
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are quite simple:
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<dl>
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<dt>hklscan start fH fK fL
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<dd> sets the start point for the HKL scan. Three values required, one for
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each reciprocal axis.
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<dt>hklscan step sH sK Sl
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<dd> sets the step width in reciprocal space. Three values required, one for
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each reciprocal axis.
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<dt>hklscan run NP mode preset
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<dd>executes the HKL scan. NP is the number of points to do, mode is the
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counting mode and can be either timer or monitor and preset is the preset
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value for the counter at each step.
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<dt>hklscan2d sim NP mode preset
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<dd>This command only for hklscan2d. It tries to calculate all points
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in the hkl scan and complains if it cannot reached or stays
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silent. Use this to test if your hklscan2d can be performed.
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</dl>
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Data is written automatically into a slightly modified TOPSI data format
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file for hklscan. The status display with topsistatus or scanstatus
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might be slightly erratic as it uses two theta as x-axis. Hklscan2d
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writes data into NeXus files.
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</P>
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<p>
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hklscan is obsolete. As of 2005, h, k, l are normal virtual motors and can be
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used with the SICS built in scan commands.
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</p>
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</BODY>
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</HTML>
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