SPATIAL-RESOLUTION OF PROFILE-BASED DETECTORS WITH EXTERNAL PICK-UP STRIPS

We studied profile-based detectors with external pick-up strips (Iaroc ci-type tubes) with the purpose to find out if they can be used as det ectors of large area and high spatial resolution. In this paper we sum marize our measurements and calculations. Contributions of different f actors in the spatial resolution were theoretically evaluated. The res olution of similar to 45 mu m in the proportional mode and similar to 100 mu m in the limited streamer mode were obtained in a laser beam. T he former was limited by electronic noise and the latter by the intrin sic streamer fluctuations. The resolution of similar to 80 mu m in pro portional mode was achieved in a muon beam (by subtracting the electro nic noise contribution, we estimate that the limit for our prototype w as around 60-65 mu m).