Thick-GEM technology offers a robust and cheap outline which allows convenient simplifications of the detector design in comparison to MWPC-s. We show here the results from a prototype chamber, which was designed to test the operation principle of a future trigger detector for high PT particles at the ALICE experiment at the CERN LHC. The basic idea is to detect the inclination of the tracks in the ALICE magnetic field; this way the smaller angle tracks, representing higher PT, can be selected. The prototype uses double layer TGEM with pad readout in Argon + CO2 , with different pad and TGEM layer geometries. Results from the data taking at the CERN PS beam facility are presented, demonstrating the applicability of the technology for high efficiency particle detection. The achievable position resolution reduction at increased inclination angles is compatible with the widening of the charge deposit due to drift length. Sparking rate is found to be propotional to the particle rate, with relatively high frequency due to charge fluctuations of minimum ionizing particles. In conclusion, it is shown that such a system comprising four detection layers meets with the requirements of high PT triggering at ALICE.