The effect of beam time structure on counting detectors in SRS experiments

Counting detector systems are increasingly used in X-ray experiments becaus e of their attractive properties as regards linearity, large dynamic range and simple noise properties. In synchrotron radiation source (SRS) applicat ions of X-ray detectors, counting rates are generally high enough to requir e dead-time correction. The time structure of an SRS beam interacts with th e dead-time characteristics of the detector in a way that the simple stocha stic dead-time models cannot always handle. This report generates analytica l and Monte Carlo mathematical models which describe the rate performance o f any given detector system when used with the typical beam structures enco untered in an SRS.