Full text
| |
| Author(s): |
Túlio Cearamicoli Vivaldini
Total Authors: 1
|
| Document type: | Master's Dissertation |
| Press: | São Paulo. |
| Institution: | Universidade de São Paulo (USP). Instituto de Pesquisas Energéticas e Nucleares (IPEN/BT) |
| Defense date: | 2010-03-18 |
| Examining board members: |
Carmen Cecília Bueno Tobias;
Suzana Botelho;
Paulo Reginaldo Pascholati
|
| Advisor: | Carmen Cecília Bueno Tobias |
| Abstract | |
The electron drift velocity characterizes the electric conductivity of weakly ionized gases and is one of the most important transport parameters for simulation and modelling of radiation detectors and plasma discharges. This work presents the results of electron drift velocity as a function of the reduced electric field obtained in pure nitrogen and pure isobutane by the Pulsed Townsend technique. In a planar geometry chamber, primary electrons were liberated from an aluminum cathode due to the incidence of a nitrogen laser beam and accelerated toward the anode (high resistivity glass plate) by an uniform electric field. The fast electric signals generated were digitalized in a 1 GHz bandwidth oscilloscope to measure the electrons transit time and to calculate the electron drift velocity in different gaps between anode and cathode. To validate this method, measurements were initially carried out in pure nitrogen, in reduced electric fields ranging from 148 to 194 Td. These results showed very good agreement with those found in the literature for this largely investigated gas. In the pure isobutane, measurements of electron drift velocities were performed as a function of reduced electric field from 190 to 211 Td. The results were concordant, within the experimental errors, with the values simulated by the Imonte (version 4.5) software and the data recently obtained by our group in the range of reduced electric field investigated in this work. (AU) | |
| FAPESP's process: | 07/06771-8 - Measurements of electron drift velocity in pure isobuthane |
| Grantee: | Túlio Cearamicoli Vivaldini |
| Support Opportunities: | Scholarships in Brazil - Master |