Manifold Design of the GEM Detectors for a Uniform Gas Flow

A simple design solution of manifolds is suggested to get nearly uniform flow of the gas mixture inside the GEM chamber. Analytical expressions concerning the design of the piping system are derived and numerically checked by means of the ANSYS-FLOTRAN code v.13 [1]. A full gas flow CFD simulation of the trapezoidal detector is finally performed on the basis of the proposed formulae that should be thoroughly validated only by further experimental tests.