Effect of the ohmic drop in a RPC-like chamber for measurements of electron transport parameters

Authors

  • Anna Raquel Petri Instítuto de Física - Universidade de São Paulo

DOI:

https://doi.org/10.15392/bjrs.v7i2A.637

Keywords:

electron transport parameters, RPC detectors, gaseous detectors

Abstract

The main advantage of Resistive Plate Chambers (RPCs), applied, for instance, in High-Energy Experiments and Positron Emission Tomography (PET), is that it is spark-protected due to the presence of, at least, one high-resistive electrode. However, the ohmic drop across the latter can affect the charge multiplication significantly. In this work, we investigate this effect in a RPC-like chamber. The counter was filled with nitrogen at atmospheric pressure and the primary ionization was produced by the incidence of nitrogen pulsed laser beam on an aluminum cathode. The illumination area of the cathode was measured using a foil of millimetric paper overlaid on this electrode. In this way, the resistance of the glass anode could be estimated using the known resistivity of the glass (ρ=2×1012 Ω.cm). Therefore, the voltage drop across the dielectric was calculated by the product of the current across the gas gap and the anode resistance. In order to mitigate the effect of the resistive electrode, the laser beam intensity was limited by interposing metallic meshes between the laser and the chamber window. The dependence of the ohmic drop from the applied voltage was analyzed. The results obtained shown that, without the meshes, the ohmic drop corresponds up to 7% of the applied voltage, preventing the detection system to reach values of density-normalized electric fields in the gas gap (Eeff/N) higher than 166 Td. By minimizing the laser beam intensity and, consequently, the primary ionization, the ohmic drop represented only 0.2% of the applied voltage, extending the Eeff /N range up to 175 Td.

Downloads

Download data is not yet available.

References

FONTE, P. High-resolution timing of MIPs with RPCs – a model. Nuclear Instruments and Methods in Physics Research A, v. 456, p. 6-10, 2000.

BELLI, G.; GABUSI, M.; MUSITELLI, G.; NARDÒ, R.; RATTI, S. P.; TAMBORINI, A.; VITULO, P. Multigap RPC time resolution to 511 keV annihilation photons. Nuclear Instruments and Methods in Physics Research A, v. 781, p. 26-33, 2015.

AKINDINOV, A.; DREYER, J.; FAN, X.; KÄMPFER, B.; KISELEV, S.; LASO GARCIA, A.; MALKEVICH, D.; NAUMANN, L.; NEDOSEKIN, A.; PLOTNIKOV, V.; DTACH, D.; SULTANOV, R.; VOLOSHIN, K. Radiation-hard ceramic Resistive Plate Chamber for forward TOF and TO systems. Nuclear Instruments and Methods in Physics Research A, v. 845, p. 203-205, 2017.

BHATT, A. D.; MAJUMDER, N. K. MONDAL, PATHALESWAR, SATYANARAYANA, B.; Improvement of time resolution in large area single gap Resistive Plate Chambers. Nuclear Instruments and Methods in Physics Research A, v. 844, p. 53-61 (2017).

HADDAD, Y.; LAKTINEH, I.; GRENIER, G.; LUMB, N.; CAUWENBERGH, S. High rate resistive plate chamber for LHC detector upgrades. Nuclear Instruments and Methods in Physics Research A, v. 718, p. 424-426, 2013.

BLANCO, A.; FONTE, P.; LOPES, L.; MANGIAROTTI, A.; FERREIRA MARQUES, R.; POLICARPO, A. Resistive plate chambers for time-of –flight measurements. Nuclear Instruments and Methods in Physics Research A, v. 513, p. 8-12, 2003.

BUENO, C. C.; FRAGA, M. M.; GONÇALVES, J. A. C.; FERREIRA MARQUES, R.; POLICARPO, A. J. P. L.; SANTOS, M. D. S. Rate effects in a proportional counter with resistive cathode. Nuclear Instruments and Methods in Physics Research A, v. 408, p. 496-502, 1998.

FRAGA, M. M.; DE LIMA, E. P.; FERREIRA MARQUES, R.; POLICARPO, A. J. P. L.; BUENO, C. C.; GONÇALVES, J. A. C.; SANTOS, M. D. S. Rate effects in radiation detectors with resistive electrodes. IEEE transactions on Nuclear Science, v. 45, p. 263-268, 1998.

FRAGA, M. M.; FERREIRA MARQUES, R.; IVANIOUCHENKOV, Y.; DE LIMA, E. P.; NEVES, F.; POLICARPO, A. J. P. L.; BUENO, C. C.; GONÇALVES, J. A. C.; SANTOS, M. D. S.; COSTA, L.; MENDIRATTA, S.; MONTEIRO, J. H. Transient behaviour and rate effects in resistive detectors. Nuclear Instruments and Methods in Physics Research A, v. 419, p. 485-489, 1998.

MANGIAROTTI, A.; LIMA, I. B.; VIVALDINI, T. C.; GONÇALVES, J. A. C.; PETRI, A. R.; BOTELHO, S.; FONTE, P.; BUENO, C. C. Secondary effects on electron multiplication in pure isobutene. Nuclear Instruments and Methods in Physics Research A, v. 694, p. 162-166, 2012.

FONTE, P.; MANGIAROTTI, A.; BOTELHO, S.; GONÇALVES, J. A. C.; RIDENTI, M. A.; BUENO, C. C. A dedicated setup for the measurement of the electron transport parameters. Nuclear Instruments and Methods in Physics Research A, v. 613, p. 40-45, 2010.

LIMA, I. B.; MANGIAROTTI, A.; VIVALDINI, T. C.; GONÇALVES, J. A. C.; BOTELHO, S.; FONTE, P.; TAKAHASHI, J.; BUENO, C. C. Experimental investigations on the first Townsend coefficient in pure isobutene. Nuclear Instruments and Methods in Physics Research A, v. 670, p. 55-60, 2012.

PETRI, A. R.; GONÇALVES, J. A. C.; MANGIAROTTI, A.; BOTELHO, S.; BUENO, C. C. Measurement of the first Townsend ionization coefficient in a methane-based tissue-equivalent gas. Nuclear Instruments and Methods in Physics Research A, v. 849, p. 31-40, 2017.

BIAGI, S. Accurate solution of the Boltzmann transport equation. Nuclear Instruments and Methods A, v. 273, p. 533-535, 1988.

BIAGI, S. A multiterm Boltzmann analysis of drift velocity, diffusion, gain and magnetic-field effects in argon-methane-water-vapour mixtures. Nuclear Instruments and Methods in Physics Research A, v. 283, p. 716-722, 1989.

BIAGI, S. Monte Carlo simulation of electron drift and diffusion in counting gases under the influence of electric and magnetic fields. Nuclear Instruments and Methods in Physics Research A, v. 421, p. 234-240, 1999.

BIAGI, S. Magboltz transport of electrons in gas mixtures. 1995. Available at: http://magboltz.web.cern.ch/magboltz/. Last accessed 20 may 2017.

HAYDON, S. C.; WILLIAMS, O. M. Combined spatial and temporal studies of ionization growth in nitrogen. Journal of Physics D: Applied Physics, v. 9, p.523-536, 1976.

YOUSFI, M.; DE URQUIJO, J.; JUÁREZ, A.; BASURTO, E.; HERNÁNDEZ-ÁVILA, J. L. Electron Swarm Coefficients in CO2–N2 and CO2–O2 Mixtures. IEEE Transactions on Plasma Science, v. 37, p. 764-772, 2009.

DAHL, D. A.; TEICH, T. H.; FRANCK, C. M. Obtaining precise electron swarm parameters from a pulsed Townsend setup. Journal of Physics D: Applied Physics, v. 45, p. 485201, 2012.

Downloads

Published

2019-02-19

Issue

Section

The Meeting on Nuclear Applications (ENAN)

How to Cite

Effect of the ohmic drop in a RPC-like chamber for measurements of electron transport parameters. Brazilian Journal of Radiation Sciences, Rio de Janeiro, Brazil, v. 7, n. 2A (Suppl.), 2019. DOI: 10.15392/bjrs.v7i2A.637. Disponível em: https://bjrs.org.br/revista/index.php/REVISTA/article/view/637. Acesso em: 21 dec. 2024.

Similar Articles

1-10 of 339

You may also start an advanced similarity search for this article.