Author/Authors :
Barvich، نويسنده , , T. and Blüm، نويسنده , , P. and Erdmann، نويسنده , , M. and Fahrer، نويسنده , , M. and Kنrcher، نويسنده , , K. and Kühn، نويسنده , , F. and Mِrmann، نويسنده , , D. and Müller، نويسنده , , Th. and Neuberger، نويسنده , , D. and Rِderer، نويسنده , , F. and Simonis، نويسنده , , H.J. and Skiba، نويسنده , , A. and Thümmel، نويسنده , , W.H. and Weiler، نويسنده , , Th. and Weseler، نويسنده , , S.، نويسنده ,
Abstract :
We report on the performance of a large micro-pattern detector with two gas electron multiplier foils and a two-layer readout structure at ground potential. The two readout layers each have a 406 μm pitch and cross at an effective angle of 6.7°. This structure allows for two orthogonal coordinates to be determined. Using a muon beam at CERN together with a silicon tracking system, the position resolutions of the two coordinates are measured to be 50 μm and 1 mm respectively (1 standard deviation). The muon detection efficiency for the two-dimensional space points reaches 96%. The detector was found to be well operational over a wide range in the settings of the different electrical fields.
