Abstract
A parallel-plate multistep chamber, filled with He (97%) and C 2H 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 μm rms, and small spot-size (≈ 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.
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