Author/Authors :
Charpak، نويسنده , , G. and Derré، نويسنده , , J. and Giganon، نويسنده , , A. and Giomataris، نويسنده , , Y. and Jourde، نويسنده , , D. and Kochowski، نويسنده , , C. and Loucatos، نويسنده , , S. and Puill، نويسنده , , G. and Rebourgeard، نويسنده , , Ph. and Robert، نويسنده , , J.P.، نويسنده ,
Abstract :
We present particle beam test results using a high-rate, high-position and high-time-resolution gaseous detector, ‘Micromegas’, of 15×15 cm2. The rate capability was measured with 10 MeV protons from a TANDEM accelerator. No effect on gain was observed at particle rates up to 109 mm−2 s−1. With an argon and DME filling the gain was stable up to 50 mC total charge on a 3 mm2 area. With minimum-ionizing particles in a CERN beam a high efficiency, close to 100%, was measured, under stable conditions. A first space-resolution measurement of 50 μm±20 μm was obtained. The operation of the chamber shows that it is possible to optimize the geometrical parameters in order to improve the space resolution and bring the time resolution low enough to contain the events of each beam crossing (every 25 ns) in the European Large Hadron Collider. Further work in this direction is being actively pursued.
