Development of GEM based digital hadron calorimeter

The University of Texas at Arlington High Energy physics group and its collaborators have been working on developing a digital hadron calorimeter (DHCAL) using GEM technology for the past several years. The group developed a large scale (30cmx30cm) GEM foils with 3M micro-pattern circuit division and constructed several prototype chambers. The group has also taken a few beam test runs to characterize the prototype chambers. This presentation will cover the current status of GEM base DHCAL development activities and beam test results.