Results concerning understanding and applications of timing GRPCs

Results of beam tests are reported: the so-called “efficiency puzzle” is investigated using a 0.1 mm gap GRPC operated at different pressures for isobutane gas. The influence of edge effects on the time-response function is studied for a (4×0.3 mm2)-gap GRPC disk of 5 cm diameter and found to have negligible influence on resolution and tails. A design of large-scale array is elaborated for experiments requiring not only good time and position resolution but also good multi-hit capabilities.