Development of a new multi-grid-type microstrip gas chamber

A new multi-grid-type MSGC (M-MSGC) has been designed and fabricated. This new MSGC has very narrow gaps between neighboring electrodes which can considerably reduce a surface charge effect. Several types of test detectors have been fabricated and the maximum gas gain was found to be beyond 10 ⁴ for a 10 μm gap M-MSGC. The observed amplitude of the cathode signal was almost the same as the anode signal. This MSGC can be a promizing detector for the field, where both the high gain and the stable operation are required.