Author/Authors :
Kobayashi، نويسنده , , M. and Yonamine، نويسنده , , R. and Tomioka، نويسنده , , T. and Aoza، نويسنده , , A. and Bito، نويسنده , , H. and Fujii، نويسنده , , K. and Higashi، نويسنده , , T. and Hiramatsu، نويسنده , , K. and Ikematsu، نويسنده , , K. and Ishikawa، نويسنده , , A. and Kato، نويسنده , , Y. and Kuroiwa، نويسنده , , H. and Matsuda، نويسنده , , T. and Nitoh، نويسنده , , O. and Ohta، نويسنده , , H. K. Sakai، نويسنده , , K. and Settles، نويسنده , , R، نويسنده ,
Abstract :
Argon with an admixture of CF4 is expected to be a good candidate for the gas mixture to be used for a time projection chamber (TPC) in the future linear collider experiment because of its small transverse diffusion of drift electrons especially under a strong magnetic field. In order to confirm the superiority of this gas mixture over conventional TPC gases we carried out cosmic ray tests using a GEM-based TPC operated mostly in Ar–CF4–isobutane mixtures under 0–1 T axial magnetic fields. The measured gas properties such as gas gain and transverse diffusion constant as well as the observed spatial resolution are presented.
Keywords :
GEM , CF4 , diffusion , Spatial resolution , iLC , TPC
