Abstract
A Time Projection Chamber (TPC) with Thick Gas Electron Multipliers (TGEMs) has been developed for an inner tracker of the J-PARC E15 experiment, a deeply-bound kaonic nuclear states search experiment. The TPC has a cylindrical design with an inner diameter of 170 mm, an outer diameter of 280 mm, and a drift length of 300 mm filled with P10 gas (90:10 argon-methane) at atmospheric pressure. A TGEM is used for the amplification of the TPC in order to realize a self-supporting structure in a limited space. We use a double TGEM structure and the maximal effective gain of more than 104 is achieved with 100 × 100 mm TGEM prototypes. Moreover, we have been developing a resistive-electrode TGEM (RETGEM) with graphite electrodes, which has the advantage of being fully spark-protected. The results of our recent studies on the TGEM prototypes with conventional copper electrodes, the RETGEM with graphite electrodes, and the newly developed hybrid-RETGEM with copper and graphite electrodes are discussed.
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