The behaviour of heavy particles in the expanding plasma jet in argon

Sanden, van de Mcm Richard; Regt, de Jm Hans; Schram, DC Daan

doi:10.1088/0963-0252/3/4/007

Cited by 78 publications

(66 citation statements)

References 27 publications

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“…15 it can be observed that in the first centimeters of the expansion, on axis the electron density at 88.3 Pa is higher than at 9.7 Pa. This is in agreement with the trends reported by van de Sanden et al [2,3,29], who measured electron densities in argon expanding plasmas at different background pressures.…”

Section: Stationary Shock and Background Pressuresupporting

confidence: 91%

“…Subsequently, dissociative recombination of an electron with the molecular ion, producing two hydrogen atoms, results in an efficient loss channel for electrons. Under our gas flow and gas pump conditions the residence time is larger than the transit time of the plasma from the nozzle exit to the other end of the reactor [29]. This means that particles, mainly H 2 , will recirculate several times before being pumped out of the reactor.…”

Section: Effect Of the Background Pressurementioning

confidence: 97%

“…A faster decay of n e at higher pressure was observed, indicating that the loss of charged particles becomes larger as the pressure rises. This behavior can be explained by the effect of molecular activated recombination (MAR) [29,30], which increases with pressure and becomes anomalously fast at pressures around 100 Pa [10]. In the MAR process of hydrogen, first a molecular ion is produced via charge exchange between a hydrogen ion and a background gas molecule.…”

Section: Effect Of the Background Pressurementioning

confidence: 99%

“…A characteristic of expanding plasmas is the formation of a stationary shock front [29][30][31][32] is determined by…”

Section: Stationary Shock and Background Pressurementioning

confidence: 99%

“…And since the position of the shock front depends on the pressure, close to the source, at the same position but at different pressures, different n e can be measured, as has been shown in [2,3,29].…”

Section: Stationary Shock and Background Pressurementioning

confidence: 99%

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Electron density and temperature measurements in a magnetized expanding hydrogen plasma

et al. 2016

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Engeln, R. A. H. (2016). Electron density and temperature measurements in a magnetized expanding hydrogen plasma. Physical Review E, 94(2), [023201]. DOI: 10.1103/PhysRevE.94.023201 General rights Copyright and moral rights for the publications made accessible in the public portal are retained by the authors and/or other copyright owners and it is a condition of accessing publications that users recognise and abide by the legal requirements associated with these rights.• Users may download and print one copy of any publication from the public portal for the purpose of private study or research.• You may not further distribute the material or use it for any profit-making activity or commercial gain • You may freely distribute the URL identifying the publication in the public portal ? Take down policyIf you believe that this document breaches copyright please contact us providing details, and we will remove access to the work immediately and investigate your claim. We report measurements of electron densities, n e , and temperatures, T e , in a magnetized expanding hydrogen plasma performed using Thomson scattering. The effects of applying an axial magnetic field and changing the background pressure in the plasma vessel on n e and T e along the expansion axis are reported. Magnetic field strengths (B field) up to 170 mT were applied, which are one order of magnitude larger than previously reported. The main effect of the applied B field is the plasma confinement, which leads to higher n e . At B fields larger than 88 mT the electron density along the expansion axis does not depend strongly on the magnetic field strength. However, T e is susceptible to the B field and reaches at 170 mT a maximum of 2.5 eV at a distance of 1.5 cm from the exit of the cascaded arc. To determine also the effect of the arc current through the arc, measurements were performed with arc currents of 45, 60, and 75 A at background pressures of 9.7 and 88.3 Pa. At constant magnetic field n e decreases from the exit of the arc along the expansion axis when the arc current is decreased. At 88.3 Pa n e shows a higher value close to the exit of the arc, but a faster decay along the expansion axis with respect to the 9.7 Pa case. T e is overall higher at lower pressure reaching a maximum of 3.2 eV at the lower arc current of 45 A. The results of this study complement our understanding and the characterization of expanding hydrogen plasmas.

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Section: Stationary Shock and Background Pressuresupporting

confidence: 91%

Section: Effect Of the Background Pressurementioning

confidence: 97%