A GEM-based Time Projection Chamber for the

In this paper we present the R&D activity on a new GEM-based TPC prototype for AMADEUS, a new experimental proposal at the DAΦNE Φ-factory at the Laboratori Nazionali di Frascati (INFN), aiming to perform measurements of the low-energy negative kaons interactions in nuclei. Such innovative detector will equip the inner part of the experiment in order to perfom a better reconstruction of the primary vertex and the secondary particles tracking. A 10x10 cm 2 prototype with a drift gap up to 15 cm was realized and succesfully tested at the πM1 beam facility of the Paul Scherrer Institut (PSI) with low momentum hadrons. The measurements of the detector efficiency and spatial resolution have been p erformed. The results as a function of the gas gain, drift field, front-end electronic threshold an d particle momentum are reported and discussed.