Performance of a small gap chamber

The design of the Small Gap Chamber combines features of the MicroStrip Gas Chamber [1] and of the MicroGap Chamber [2]. It is a detector for a single coordinate read-out with the single metal layer pattern of a MSGC and the anode-cathode separation of a MGC. A polyimide layer, suitably patterned on top of the metal, ensures an insulation at the edge of the electrodes and defines the conductive areas in front of the gas. We report on the performance measured in a test beam at CERN and with an X-ray tube in the laboratory.