Current Status of LANSCE Single Crystal Diffractometer - SCD

The Single Crystal Diffractometer (SCD) at LANSCE, Los Alamos National Laboratory, represents a powerful tool for many crystallographic and magnetic structure determinations. The instrument is located at the Lujan Neutron Scattering Center and utilizes the time-of-flight (TOF) Laue technique for neutron scattering data collection. This technique, combined with a 25 cm $\times $ 25 cm multi-wire 3He position-sensitive detector and the possibility of two axis of rotation for sample orientation yield to an 80{\%} sphere of coverage in reciprocal space. The redesign and status of the Single Crystal Diffractometer at LANSCE are reported. We give an overview of the instrument characteristics and of the of calibration and data evaluation activities (higher intensity, lower background, better profile shape, improved resolution).