Monte Carlo simulation of non-conservative positron transport in pure argon

Šuvakov, Milovan; Petrović, Zoran Lj.; Marler, Joan; Buckman, Stephen; Robson, Robert; Malović, Gordana

doi:10.1088/1367-2630/10/5/053034

Cited by 46 publications

(69 citation statements)

References 53 publications

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“…While our results are directly applicable to compare with the results of papers [23,24] it is also important to note that the upper atmosphere lightning's also involve high energy runaway electrons [29,30]. In addition our results are relevant to other studies of thermalization of electrons [33] and positrons [34,35] that in addition to atmospheric phenomena may include biomedical applications and radiation damage.…”

Section: Resultsmentioning

confidence: 62%

Modelling of anomalous Doppler broadened lines, thermalization of electrons and the role of radicals in discharges at high E/N

Petrović

Nikitovic

Stojanović

2008

J. Phys.: Conf. Ser.

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Abstract. In this paper we show how Monte Carlo technique developed for swarm studies may be applied to model some real discharges or to provide data for realistic plasma models. In all cases discussed here the Monte Carlo technique without self consistent field is driven to a much greater level of complexity than usually found in swarm studies. We discuss three conceptually quite different situations that require exact modelling by Monte Carlo Simulations (MCS). The first is the case of transport in gases where degree of dissociation is large and thereby radicals formed by the discharge may affect the transport coefficients. Based on recent calculations for electron CF x radical cross sections we calculated how transport coefficients would be affected by the presence of radicals in pure CF 4 and CF 4 /Ar mixtures covering range of abundances often found in plasma etching devices. The second case studied here is modelling of thermalization of high energy electrons in the atmospheric gases as an attempt to provide the basis for detection of very high energy cosmic particles. In that case pressure dependent emission efficiency is studied as a function of electron energy and the system is developed to an arbitrary degree of secondary electron production. Finally we give some recent advances and current status of modelling of high E/N discharges operating in Townsend's regime in hydrogen where anomalous broadening was observed and explained by fast neutral excitation in both directions along and against the acceleration due to electric field.

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Section: Resultsmentioning

confidence: 62%

Modelling of anomalous Doppler broadened lines, thermalization of electrons and the role of radicals in discharges at high E/N

Petrović

Nikitovic

Stojanović

2008

J. Phys.: Conf. Ser.

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“…Data for argon and nitrogen were presented earlier [5,6] while data for hydrogen will be presented later. First, we analyze whether the standard formula defining the difference between the bulk and flux properties [9] works well in this case.…”

Section: Monte Carlo Resultsmentioning

confidence: 99%

“…It is worth checking whether conditions match those from Petrović et al [1] or from Vrhovac and Petrović Comparison between bulk drift velocities calculated using our MC code and predicted by Eq. (1) for positron transport in pure (a) argon [5], (b) nitrogen [6] and (c) hydrogen [7]. The calculations of the bulk drift velocity W were made both directly from MC and by modifying the results of Eq.…”

Section: Monte Carlo Resultsmentioning

confidence: 99%

“…The most striking feature of our observations was that negative differential conductivity (NDC) is observed in the bulk drift velocity even when the flux drift velocity does not show any signs of NDC. It was shown that the bulk drift velocity NDC is result of the nonconservative nature of Ps formation [5]. Here we check how the manifestation of NDC in positron transport fares against the previously mentioned theoretical conditions for NDC [1,3,4] and use our current results as a guide for modifying those conditions.…”

Section: Introductionmentioning

confidence: 82%

“…We have used our new Monte Carlo (MC) code to investigate the transport of positrons in gases, particularly in argon, molecular nitrogen and hydrogen [5][6][7]. Positrons interactions with atoms and molecules are fundamentally different from those of electrons [8].…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Negative differential conductivity of positrons in gases

Bankovic

Petrović

Robson

et al. 2009

Nuclear Instruments and Methods in Physics Research Section B:

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Theoretical study of positron scattering by group 14 tetra hydrides: A quantum mechanical approach

Sinha

Singh

Antony

2018

Int J of Quantum Chemistry

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The present work provides a comprehensive set of positron impact scattering cross sections for group 14 tetrahydrides, namely, SiH4, GeH4, SnH4, and PbH4. The well‐established spherical complex optical potential and complex scattering potential‐ionization contribution methods are modified to incorporate positron scattering in the present work to calculate various cross sections. The positronium formation channel is adequately included through an improved inelastic threshold. The energy range chosen for the direct ionization cross section is from the respective ionization potential (I) of the molecule to 5 keV. Likewise, positronium formation and total ionization cross sections are reported from the positronium formation threshold to 300 eV and 5 keV, respectively, and the total cross section is computed for an extensive energy range of 1 eV to 5 keV. The positron impact total cross section for stannane molecule is computed for the first time. A characteristic valley is observed in the total cross sections with minima close to the positronium formation threshold. Further increase of cross section signifies the opening of inelastic channels especially positronium formation. In general, a reasonable agreement is found between the present results and other comparisons, wherever available. Furthermore, this is the first report of the inelastic cross sections (direct ionization, positronium formation, and total ionization) for the present set of targets.

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Monte Carlo simulation of non-conservative positron transport in pure argon

Cited by 46 publications

References 53 publications

Modelling of anomalous Doppler broadened lines, thermalization of electrons and the role of radicals in discharges at high E/N

Modelling of anomalous Doppler broadened lines, thermalization of electrons and the role of radicals in discharges at high E/N

Negative differential conductivity of positrons in gases

Theoretical study of positron scattering by group 14 tetra hydrides: A quantum mechanical approach

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