2.44A (Ge331) calibration data for new Ge115 monochromator installed on Echidna Neutron Powder Diffraction Instrument

In early October 2024 the Echidna neutron powder instrument located at the OPAL reactor, ANSTO, installed a new monochromator with Ge115 cut. The present calibration data were collected shortly afterwards from a standard LaB6 sample in a 6mm diameter Vanadium can. The instrument was set to 140 degrees takeoff angle and monochromator angle 130.57 degrees, corresponding to the Ge331 reflection. Raw data in NeXus format are contained in ECH0034264.nx.hdf. These data were corrected for variable detector response using the information in eff_2024-10-06.cif and vertical heights adjusted according to the table in vertical_offsets_2024-10-06.txt. The angular positions of the detectors were adjusted from the nominal 1.25 degree spacing using echidna-Apr2018.ang. The detector response was then recorrected based on overlapping measurements using the algorithm described in Avdeev and Hester (2018) resulting in a 1D pattern suitable for fitting wavelength and peak shapes. This 1D pattern is provided here as a plain table (ECH0034264_LaB6.xyd) and as a pdCIF file (ECH0034264_LaB6.cif) including metadata on data collection and reduction. Details of data reduction are described in the above paper, and the data reduction routines used are included in the Gumtree package as python code.