Abstract
Two prototype position sensitive parallel plate avalanche counters (PPACs) have been fabricated at the Rare Isotope Science Project (RISP). Both detectors have active areas of 10 × 10 cm2 and utilize a stripped electrode structure, together with a delay line readout, to extract position information. Testing was conducted with an 241Am α source, and 2-dimensional position information was obtained. A position resolution of 0.55 mm full width at half maximum (FWHM), together with a position linearity of ±55 μm over a 67-mm detection range, were measured. A time resolution of 450 ps (FWHM) was also measured.
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