Growth of ionization currents in nitrogen

Maller, V. N.; Naidu, M. S.

doi:10.1088/0022-3727/7/10/314

Cited by 19 publications

(16 citation statements)

References 16 publications

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“…The ionization coefficient α/N as a function of E/N values calculated in the present work, are shown in figure (14) in comparison with experimental values (Raju, 2012), (Maller and Naidu, 1974), (Rao and Raju, 1973), (Qiu et al, 1989). It can be seen that they are agree quit well with the present results.…”

Section: Dichlorodifluoromethan CCL 2 Fsupporting

confidence: 88%

“…The variation of electron characteristic energy values in CCl 2 F 2 as a function of E/N values are shown in figure (13). As shown in figure there's difference between present calculation and experimental results of (Naidu and Prasad, 1969), (Maller and Naidu, 1974), but there is good agreement with experimental results of (Raju, 2012).…”

Section: Dichlorodifluoromethan CCL 2 Fsupporting

confidence: 52%

“…The dependence of ionization coefficient α/N on reduced electric field E/N itself is not very different for electronegative gases and nonnegative ones, and α/N increases with increases of E/N values in exponential form. (Qui et al, 1989, Moruzzi, 1963, Rao and Raju, 2012, Maller and Naidu, 1974and Christophorou and Olthoff, 2004 which show little difference from each other, present calculation being slightly higher by approximately 3% over the range of reduced electric field 100 Td≤ E/N ≤ 1000 Td. The attachment coefficient exponentially decreases with increasing E/N.…”

Section: Dichlorodifluoromethan CCL 2 Fmentioning

confidence: 61%

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Solving of the Boltzmann transport equation using two - term approximation for pure electronegative gases (SF6, CCl2F2)

2019

ZJPAS

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The Boltzmann transport equation is solved by using two-term approximation for pure electronegative gases (SF 6 , CCl 2 F 2). This method used to calculate the electron energy distribution function (EEDF) and electron swarm parameters in the range of E/N varying from 100 Td to 1000 Td (1 Td=10-17 V.cm 2). Electron swarm parameters have been calculated as a function of E/N namely: drift velocity, mean electron energy, characteristic energy, diffusion coefficients, mobility, and attachment and ionization coefficients also effective ionization coefficient. The results have shown that the calculated swarm parameters were in good agreements with those obtained by experiment and theoretical (Three-term and Monte Carlo Simulation) methods. A set of elastic and inelastic cross-sections have been collected for each gas such that the computed and experimental values gave good agreement for each swarm parameter over the entire E/N range

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Section: Dichlorodifluoromethan CCL 2 Fsupporting

confidence: 88%

Section: Dichlorodifluoromethan CCL 2 Fsupporting

confidence: 52%

Section: Dichlorodifluoromethan CCL 2 Fmentioning

confidence: 61%

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Solving of the Boltzmann transport equation using two - term approximation for pure electronegative gases (SF6, CCl2F2)

2019

ZJPAS

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“…The latter results agree with the ones by Ryzko [31] who also measured an increase (with respect to dry air) in the electron drift velocity in moist air kept at 293 K, a pressure of 16 Torr and for E/N between 120 and 150 Td. The measurements done by Maller et al [38] in dry and humid air (with a relative humidity of 55%) at 293 K, pressures varying between 0.4 and 3.2 Torr and for E/N between 60 and 1500 Td show that the characteristic energy (D T /µ) in humid air exhibits a slight enhancement (of maximum 15% at 60 Td) above the dry case for values of E/N below 250 Td. The work by Raja Rao et al [39] reported experimental results for the ionization coefficient α/N in dry and humid air (at atmospheric pressure with a relative humidity of 56% and 293 K (room temperature)) for E/N between 153 and 2750 Td showing that α/N is higher in humid air.…”

Section: Electron Transport Coefficientsmentioning

confidence: 97%

Electron energy distribution functions and transport coefficients relevant for air plasmas in the troposphere: impact of humidity and gas temperature

Gordillo‐Vázquez

2009

Plasma Sources Sci. Technol.

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A Boltzmann and Monte Carlo analysis of the electron energy distribution function (EEDF) and transport coefficients for air plasmas is presented for the conditions of the Earth troposphere where some transient luminous events (TLEs) such as blue jets, blue starters and gigantic jets have been observed. According to recent model results (Minschwaner et al 2004 J. Climate 17 1272) supported by the halogen occultation experiment, the relative humidity of the atmospheric air between 0 and 15 km can change between 15% and 100% depending on the altitude investigated and the ground temperature. The latter results cover a region of latitudes between −25 • S and +25 • N, that is, the Earth tropical region where lightning and TLE activity is quite high. The calculations shown here suggest that the relative humidity has a clear impact on the behaviour of the EEDF and magnitude of the transport coefficients of air plasmas at ground (0 km) and room temperature conditions (293 K). At higher altitudes (11 and 15 km), the influence of the relative humidity is negligible when the values of the gas temperature are assumed to be the 'natural' ones corresponding to those altitudes, that is, ∼215 K (at 11 km) and ∼198 K (at 15 km). However, it is found that a small enhancement (of maximum 100 K) in the background gas temperature (that could be reasonably associated with the TLE activity) would lead to a remarkable impact of the relative humidity on the EEDF and transport coefficients of air plasmas under the conditions of blue jets, blue starters and gigantic jets at 11 and 15 km. The latter effects are visible for relatively low reduced electric fields (E/N 25 Td) that could be controlling the afterglow kinetics of the air plasmas generated by TLEs. However, for much higher fields such as, for instance, 400 Td (representative of the fields in the streamer coronas and lightning leaders), the impact of increasing the relative humidity and gas temperature is only slightly noticeable in the attachment coefficient that can exhibit an increase of up to one order of magnitude at 11 km and 15 km for temperatures of 313 K and 308 K, respectively. Finally, a brief analysis is carried out on the impact of the gas temperature on the diffusion coefficients of neutrals and ions. The present results show quite reasonable agreement with available measurements in dry and moist air.

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“…Além da técnica de variação da distância, os estudos do crescimento da corrente em SST podem ser realizados em termos da variação do número de moléculas do gás N (ou da variação da pressão) [27]. Para isso, a Eq.…”

Section: Corrente Em Função Da Densidade Do Gásunclassified

Medidas do primeiro coeficiente Townsend de ionização em gases inibidores de descargas

Lima

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In the present work, results concerning the first Townsend ionization coefficient (α) in pure isobutane within the density-normalized electric field (E/N) range of 145 to 194 Td are presented. The experimental setup consists of RPC-like cell with the anode made of a high resistivity glass (2 x 10 12 Ωcm) and a metallic cathode, directly connected to an electrometer, on which photoelectrons are produced by the incidence of a pulsed laser beam. The α coefficient is determined by measuring the current under primary ionization and avalanche regime. Since for the E/N range covered by this work, there are no experimental values for pure isobutane available in the literature, the obtained values were compared with Magboltz 2 results. Our studies included the determination of α coefficient for different repetition rates and laser beam intensity. The ratio of the fast charge to the total charge is related to the first Townsend coefficient, so studies concerning the ionic and the electronic contribution to the average current were also performed. Since there are few results available in the literature for isobutane, concerning collisional cross section and electron transport parameters, is common to consider results from its structural isomer: n-butane. Thus, in order to perform a comparative analysis, the coefficient α was also determined for n-butane.

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Growth of ionization currents in nitrogen

Cited by 19 publications

References 16 publications

Solving of the Boltzmann transport equation using two - term approximation for pure electronegative gases (SF6, CCl2F2)

Solving of the Boltzmann transport equation using two - term approximation for pure electronegative gases (SF6, CCl2F2)

Electron energy distribution functions and transport coefficients relevant for air plasmas in the troposphere: impact of humidity and gas temperature

Medidas do primeiro coeficiente Townsend de ionização em gases inibidores de descargas

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