Ring-Imaging Detector with Liquid and Solid Radiators Using a Multistep Parallel-Plate Avalanche Chamber at Atmospheric Pressure with Optical Readout

摘要

A parallel-plate multistep chamber, filled with He (97%) and C sub 2 H sub 6 (3%) at atmospheric pressure, and tetrakis(dimethylamine)ethylene, with an optical readout system was tested. Laboratory tests using an ultraviolet flash lamp show a good single-photoelectron efficiency, spatial resolution better than 220 mu m rms, and small spot-size (approx.3 mm FWHM) for the single-photoelectron avalanches. Tests in a 10 GeV particle beam confirm the good performance of the device, the high efficiency, the capability of very complex and dense position-information readout, and the suitability for imaging of high-energy gamma-rays. 13 refs., 13 figs. (ERA citation 14:005002)