You will need to run a sample which will create good clean peaks at known reference dSpacing positions. To get a good calibration you will want good statistics on this calibration data. Vanadium and Ceria are common samples used for calibration.
Mantid provides a graphical user interface that calculate can calibrations and visualize them.
It is possible to load an existing calibration (as a CSV file) and to generate a new calibration file (which becomes the new current calibration).
A description of the inte3rface and all of it’s controls can be found here.
Calibration of every detector/pixel at the same time is done by EnggCalibrateFull. This calculates the calibration in a single step and outputs a table workspace of the calibration. As it is calibrating the whole instrument it can take some time, the next section shows how you can perform a partial calibration.
EnggCalibrate allows calibration of individual bank within the instrument, which is useful if only one bank has moved from a previous calibration, or if the calibration failed for a certain area of the instrument.
All of these approaches use the algorithm EnggFitPeaks, FindPeaks and EnggVanadiumCorrections to find, and fit the recorded peaks and compare them to the expected values.
The peak functions (shapes):
The result of the calibration (the output table given in OutDetPosTable) is accepted by both EnggCalibrate and EnggFocus which use the columns ‘Detector ID’ and ‘Detector Position’ of the table to correct the detector positions before focusing. The OutDetPosTable output table can also be used to apply the calibration calculated by this algorithm on any other workspace by using the algorithm ApplyCalibration.
Category: Calibration