Detectors for High Photon Rates
The increasing flux of photons available from synchrotron radiation sources requires x-ray detectors with greater and greater range in the counting rate capability. Dynamic studies of biological systems in which structural changes can be observed on a short time scale are of particular interest. No detector at present comes close to satisfying all the requirements simultaneously, such as counting rate capability, large dynamic range, high quantum efficiency over a wide range of energies, high position resolution, fast gating and consecutive time-slicing capability. Each detection principle developed so far has some good properties and some serious limitations, and the only practical approach for the near future is to find the best compromise for a particular experiment of interest. For example, some interesting detectors have a sufficiently large number of position elements (pixels) and can operate at high counting rates, but have a limited dynamic range and a long readout time. Thus consecutive time-slicing is not possible, and repetitive excitation and exposures of the sample are necessary.
KeywordsTime Slice Delay Line High Counting Rate Anode Wire Wire Spacing
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