System for monocrystal automatic orientation on the base of three-axes goniometer with stepping motors

A system for monocrystal orientation is described. It permits setting precisely one of monocrystal axes (crossing of two crystallographic planes) into vertical position after preliminary visual mounting of a monocrystal of a goniometer in automatic regime. After that the crystal without violation of orientation could be attached to the edge of cryostat for further measurements. Plane position is defined by appearance of peaks in fixed windows of time spectrum. For each plane the system provides for sample setting into position with maximum of peak intensity for both planes. The search of planes goes via sequence of measurements of time spectra and turning of sample. The system is used at the IBR-2 pulsed reactor