  The high-intensity time-of-flight neutron diffractometer POWTEX for powder
and texture analysis is currently being built to be operated in the eastern
guide hall of the research reactor FRM II near Munich. Having heavily faced the
world-wide 3He crisis in 2009, we promptly initiated the development of
3He-free detector alternatives that are tailor-made for the requirements of
large-area diffractometers. Herein, we report about the 2017 enterprise to
operate one building unit of the final POWTEX detector at the neutron powder
diffractometer POWGEN at the Spallation Neutron Source of the Oak Ridge
National Lab, USA. As a result, we present the first angular- and
wavelength-dependent data of the POWTEX detector, current data-reduction steps
as implemented in Mantid and also multi-dimensional refinement results of two
samples (diamond and BaZn(NCN)2) by use of the GSAS-II software suite.
