Hklscan and Hklscan2d (Obsolete)

Hklscan is a command which allows to scan in reciprocal space expressed as Miller indizes on a four circle diffractometer. Hklscan operates with a single detector. Hklscan2d does the same as hklscan but for the position sensitive detectors, saving data into NeXus files. Hklscan and Hklscan2d share the same syntax. Prerequisite for this is the existence of a scan object and the hkl-object for doing crystallographic calculations. Make sure the properties of the hkl object (UB, wavelength, NB) have some reasonable relation to reality, otherwise the diffractometer may travel to nowhere. Also it is a good idea to drive the diffractometer to the end points of the intended scan in reciprocal space. hklscan will abort if the requested scan violates diffractometer limits. The commands implemented are quite simple:

hklscan start fH fK fL

sets the start point for the HKL scan. Three values required, one for each reciprocal axis.

hklscan step sH sK Sl

sets the step width in reciprocal space. Three values required, one for each reciprocal axis.

hklscan run NP mode preset

executes the HKL scan. NP is the number of points to do, mode is the counting mode and can be either timer or monitor and preset is the preset value for the counter at each step.

hklscan2d sim NP mode preset

This command only for hklscan2d. It tries to calculate all points in the hkl scan and complains if it cannot reached or stays silent. Use this to test if your hklscan2d can be performed.

hklscan is obsolete. As of 2005, h, k, l are normal virtual motors and can be used with the SICS built in scan commands.