Effect of the ohmic drop in a RPC-like chamber for measurements of electron transport parameters
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| Format: | Artículo científico |
| Langue: | en |
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Sociedade Brasileira de Proteção Radiológica - SBPR
2019
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| _version_ | 1876436351461621760 |
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| author | Anna Raquel Petri |
| author_facet | Anna Raquel Petri |
| contents | Effect of the ohmic drop in a RPC-like chamber for measurements of electron transport parameters Anna Raquel Petri A. Mangiarotti J. A. C. Gonçalves C. C. Bueno Biología RPC detectors gaseous detectors Electron transport parameters 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. 2019 artículo científico 2319-0612 https://www.redalyc.org/articulo.oa?id=722280838076 en http://www.redalyc.org/revista.oa?id=7222 Brazilian Journal of Radiation Sciences application/pdf Sociedade Brasileira de Proteção Radiológica - SBPR Brazilian Journal of Radiation Sciences (Brasil) Num.2A Vol.7 |
| format | Artículo científico |
| id | redalyc_722280838076 |
| institution | Redalyc |
| language | en |
| publishDate | 2019 |
| publisher | Sociedade Brasileira de Proteção Radiológica - SBPR |
| spellingShingle | Effect of the ohmic drop in a RPC-like chamber for measurements of electron transport parameters Anna Raquel Petri Biología RPC detectors gaseous detectors Electron transport parameters Effect of the ohmic drop in a RPC-like chamber for measurements of electron transport parameters Anna Raquel Petri A. Mangiarotti J. A. C. Gonçalves C. C. Bueno Biología RPC detectors gaseous detectors Electron transport parameters 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. 2019 artículo científico 2319-0612 https://www.redalyc.org/articulo.oa?id=722280838076 en http://www.redalyc.org/revista.oa?id=7222 Brazilian Journal of Radiation Sciences application/pdf Sociedade Brasileira de Proteção Radiológica - SBPR Brazilian Journal of Radiation Sciences (Brasil) Num.2A Vol.7 |
| title | Effect of the ohmic drop in a RPC-like chamber for measurements of electron transport parameters |
| topic | Biología RPC detectors gaseous detectors Electron transport parameters |
| url | https://www.redalyc.org/articulo.oa?id=722280838076 |