Relatore
Dr.
Tadeusz Kowalski
(AGH, University of Science and Technology, Krakow, Poland)
Descrizione
The ternary gas mixtures of Ne + CO2 + N2 is used in TPC, in the main tracking detector of ALICE at LHC accelerator. This mixture has a small diffusion constants, small thickness, reasonable value of electron drift velocity, small multiple scattering. A small addition of N2 increases the electron drift velocity and reduces the micro-sparking.
In this mixtures, besides the direct ionization, gas multiplication is enhanced by Penning transfer both with CO2 and N2. Up to now, the range of measured gas gain is limited by 2*10^3 – 5*10^4.
In this work, we want to present the gas gain curves in a wide range beginning from the ionization regime to the breakdown limit (few * 10^5), for mixtures pressures from 400 hPa to 1800 hPa, gas composition of Ne + CO2 (10%) + N2 (2.5 ; 5 and 7.5%, respectively) and for Ne + N2 (2.5; 5 and 7.5%, respectively). The measured data have been fitted using Magboltz simulation program to determine the Penning transfer rates.
Autore principale
Dr.
Tadeusz Kowalski
(AGH, University of Science and Technology, Krakow, Poland)
Coautore
Dr.
Ozkan Sahin
(Department of Physics, Uludag University, 16059 Bursa, Turkey)
