A new two-dimensional X-ray drift chamber for diffraction studies with pulsed synchrotron radiation

A two-dimensional position-sensitive detector (drift-chamber) for X-ray diffraction experiments with pulsed synchrotron radiation is described. For the measurements of drift direction (x), the small drift chamber uses a reference signal generated by the electron bunches circulating in the storage ring. A flat geometry delay-line, inductively connected to the anode, detects the position of avalanche electrons on the anode wire (y-direction). The main features are: spatial resolution in drift direction (x), 100 μm for 5 keV photons; spatial resolution in y direction, 400 μm; maximum counting-rate, 5 x 105 cps; quantum efficiency ar 5 keV, 52%. The system has been successfully tested at the ADONE storage ring at Frascati by measuring the small-angle diffraction spectrum of a dry tendon collagen. (orig.)