Author/Authors :
Benussi، نويسنده , , L. and Bertani، نويسنده , , M. and Bianco، نويسنده , , Pardeep S. and Fabbri، نويسنده , , F.L and Gianotti، نويسنده , , P. and Giardoni، نويسنده , , M. and Ghezzo، نويسنده , , A. and Guaraldo، نويسنده , , C. and Lanaro، نويسنده , , A. and Locchi، نويسنده , , P. and Lu، نويسنده , , J. and Lucherini، نويسنده , , V. and Mecozzi، نويسنده , , A. De Pace، نويسنده , , E. and Passamonti، نويسنده , , L. and Qaisar، نويسنده , , N. and Ricciardi، نويسنده , , A. and Sarwar، نويسنده , , S. and Serdyouk، نويسنده , , V. and Trasatti، نويسنده , , L. and Volkov، نويسنده , , A. and Zia، نويسنده , , A.، نويسنده ,
Abstract :
An array of 2424 2.6 m-long, 15 mm-diameter mylar straw tubes, arranged in two axial and four stereo layers, has been assembled. The array covers a cylindrical tracking surface of 18 m2 and provides coordinate measurement in the drift direction and along the wire. A correction of the systematic effects which are introduced by gravitational sag and electrostatics, thus dominating the detector performance especially with long straws, allows to determine wire position from drift-time distribution. The correction has been applied to reach a space resolution of 40 μm with DME, 100 μm with Ar+C2H6, and 100–200 μm with CO2. Such a resolution is the best ever obtained for straws of these dimensions. A study of the gas leakage for the straw system has been performed, and results are reported. The array is being commissioned as a subdetector of the FINUDA spectrometer, and tracking performances are being studied with cosmic rays.
