| Full text | |
| Author(s): |
Mangiarotti, A.
[1, 2]
;
Lima, I. B.
[3]
;
Vivaldini, T. C.
[3]
;
Goncalves, J. A. C.
[3]
;
Petri, A. R.
[3]
;
Botelho, S.
[3, 4]
;
Fonte, P.
[1, 5]
;
Bueno, C. C.
[3, 4]
Total Authors: 8
|
| Affiliation: | [1] Univ Coimbra, Dept Fis, Lab Instrumentacao & Fis Expt Particulas, P-3004516 Coimbra - Portugal
[2] Univ Coimbra, Dept Fis, Fac Ciencias & Tecnol, P-3004516 Coimbra - Portugal
[3] Inst Pesquisas Energet & Nucl, BR-05508000 Sao Paulo - Brazil
[4] Pontificia Univ Catolica Sao Paulo, Dept Fis, BR-01303050 Sao Paulo - Brazil
[5] Inst Super Engn Coimbra, P-3030199 Coimbra - Portugal
Total Affiliations: 5
|
| Document type: | Journal article |
| Source: | NUCLEAR INSTRUMENTS & METHODS IN PHYSICS RESEARCH SECTION A-ACCELERATORS SP; v. 694, p. 162-166, DEC 1 2012. |
| Web of Science Citations: | 1 |
| Abstract | |
The presence of secondary processes in electron multiplication under high uniform electric fields at atmospheric pressure in pure isobutane was investigated. The experimental setup consists of a Resistive Plate Chamber-like cell with the anode made of a high resistivity glass (2 x 10(12) Omega cm) and a metallic cathode, on which photoelectrons are produced by the incidence of a pulsed laser beam. In particular, the dependence of the first Townsend coefficient (alpha) on the repetition rate and the intensity of the UV laser pulses was studied. The E/N range considered spanned from approximate to 145 to approximate to 200 Td. The alpha coefficient was determined by measuring both the primary ionization and the avalanche currents with the help of an electrometer, directly connected to the cathode. Of all the investigated secondary effects, only the ohmic drop across the resistive glass has been found to be non-negligible in the present experimental conditions and has been corrected for. The obtained values are compared with Magboltz simulation results and presented in tabular form. (C) 2012 Elsevier B.V. All rights reserved. (AU) | |
| FAPESP's process: | 07/50591-4 - Alessio Mangiarotti | University of Coimbra - Portugal |
| Grantee: | Carmen Cecília Bueno |
| Support Opportunities: | Research Grants - Visiting Researcher Grant - International |