Position readout of MSGC by position encoding into signal pulses

We are currently developing a new readout method for MSGCs based on a fast ADC system and position encoding in signal waveforms. In this method signal shapes from an MSGC are digitally analyzed to provide the incident positio ns of individual signals. Signal shapes are varied with the incident positi on on the MS plate. Both x and y axes carl be encoded into one pulse signal for a later analysis in the digital signal processing. To realize the prin ciple, we have fabricated a special type of the MS plate. The MS plate cons ists of anode strips, cathode electrodes; and grid electrodes placed betwee n the anode and the cathode. No backside electrode is necessary for two dim ensional position sensing. After simulation calculations for the ion collec tion process, several prototype MS plates were fabricated. A test detector has shown a photopeak for 5.9 keV X-rays. The principle of the position det ection has been successfully demonstrated using a fall time measurement of signal pulses.