Development and preliminary tests of resistive microdot and microstrip detectors

Abstract

In the last few years our group has focused on developingvarious designs of spark-protected micropattern gaseous detectors featuringresistive electrodes instead of traditional metallic ones: resistivemicrostrip counters, resistive gas electron multiplier, resistive micro meshgaseous structure. These detectors combine in one design the best featuresof resistive plate chamber (spark-protection) and micropattern detectors (ahigh position resolution).In this paper we report the progress so far made in developing other typesof resistive micropattern detectors: a microdot-microhole detector and amicrogap-microstrip detector. The former detector is an optimal electronamplifier for some special designs of dual phase noble liquid timeprojection chambers, for example with a CsI photocathode immersed inside thenoble liquid. Preliminary tests of such a detector, for the first time builtand investigated, are reported in this paper. The latter detector is mainlyorientated towards medical imaging applications such as x-ray scanners.However, we believe that after a proper gas optimization, these detectorscould also achieve a high time resolution and could thus be used inapplications as time of flight positron emission tomography, detection ofcharged particles with simultaneously high time and position resolution etc.