Download or read book Programmers Guide to Finger, Thumb, and Triple Axis Real Time Experiment Control Programs written by and published by . This book was released on 1978 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This manual describes the algorithms and codes written to control the neutron scattering real-time experiments. These experiments consist of three diffractometers, called Thumb, Finger, and Triple Axis, as well as an x-y Plotter. The basic control system consists of an experiment interfaced to an SDS-910 which is in turn interfaced to a PDP-15. All direct experiment control is performed in the 910, e.g., setting angles, handling experiment interrupts, etc. Thus, all three experiments ''look'' the same to the 15. The Thumb diffractometer consists of a sample table of rotation for the crystal being studied and a detector arm which is rotated about the sample table axis. All other angles are fixed. Thus, only elastic scattering can be performed on this diffractometer. The Finger diffractometer has an analyzing crystal where the Thumb detector is located. This crystal can be rotated to select a given energy from the beam scattered by the sample before it enters the detector. Thus, inelastic scattering can be performed. The Triple Axis resembles the Finger except the monochromator and drum angles as well as the detector and analyzer crystal angles can all move independently.