Electrostatic modes in multi-ion and pair-ion collisional plasmas

Vranjes, J.; Petrovic, D.; Pandey, B. P.; Poedts, S.
July 2008
Physics of Plasmas;Jul2008, Vol. 15 Issue 7, p072104
Academic Journal
The physics of plasmas containing positive and negative ions is discussed with special attention to the recently produced pair-ion plasma containing ions of equal mass and opposite charge. The effects of the density gradient in the direction perpendicular to the ambient magnetic field vector are discussed. The possible presence of electrons is discussed in the context of plasma modes propagating at an angle with respect to the magnetic field vector. It is shown that the electron plasma mode may become a backward mode in the presence of a density gradient, and this behavior may be controlled either by the electron number density or the mode number in the perpendicular direction. In plasmas with hot electrons an instability may develop, driven by the combination of electron collisions and the density gradient, and in the regime of a sound ions’ response. In the case of a pure pair-ion plasma, for lower frequencies and for parameters close to those used in the recent experiments, the perturbed ions may feel the effects of the magnetic field. In this case the plasma mode also becomes backward, resembling features of an experimentally observed but yet unexplained backward mode.


Related Articles

  • Modeling of impurity effect on drift instabilities in plasmas with many ion species. Moradi, S.; Tokar, M. Z.; Weyssow, B. // Physics of Plasmas;Jan2010, Vol. 17 Issue 1, p012101 

    Drift microinstabilities, being the main cause of anomalous transport of charged particles and energy in fusion plasmas, can be strongly influenced by the presence of impurities. Normally a large amount of different ion species from diverse charge states and chemical elements is present. An...

  • Honeycomblike large area LaB6 plasma source for Multi-Purpose Plasma facility. Woo, Hyun-Jong; Chung, Kyu-Sun; You, Hyun-Jong; Lee, Myoung-Jae; Lho, Taihyeop; Choh, Kwon Kook; Yoon, Jung-Sik; Jung, Yong Ho; Lee, Bongju; Yoo, Suk Jae; Kwon, Myeon // Review of Scientific Instruments;Oct2007, Vol. 78 Issue 10, p103505 

    A Multi-Purpose Plasma (MP2) facility has been renovated from Hanbit mirror device [Kwon et al., Nucl. Fusion 43, 686 (2003)] by adopting the same philosophy of diversified plasma simulator (DiPS) [Chung et al., Contrib. Plasma Phys. 46, 354 (2006)] by installing two plasma sources: LaB6 (dc)...

  • Initiation of ecton processes by interaction of a plasma with a microprotrusion on a metal surface. Barengolts, S. A.; Mesyats, G. A.; Tsventoukh, M. M. // Journal of Experimental & Theoretical Physics;Dec2008, Vol. 107 Issue 6, p1039 

    Evolution of rapid (∼10 ns) Ohmic overheating of a microprotrusion on a surface in contact with a plasma by emission current is studied taking into account the energy carried by plasma ions and electrons, as well as Ohmic heating, emissive source of energy release (Nottingham effect), and...

  • Lower hybrid current drive at ITER-relevant high plasma densities. Cesario, R.; Amicucci, L.; Calabrò, G.; Cardinali, A.; Castaldo, C.; Marinucci, M.; Panaccione, L.; Pericoli-Ridolfini, V.; Tuccillo, A. A.; Tudisco, O. // AIP Conference Proceedings;11/26/2009, Vol. 1187 Issue 1, p419 

    Recent experiments indicated that a further non-inductive current, besides bootstrap, should be necessary for developing advanced scenario for ITER. The lower hybrid current drive (LHCD) should provide such tool, but its effectiveness was still not proved in operations with ITER-relevant density...

  • Simulation and demonstration of magnetohydrodynamic energy conversion in a high-temperature inert gas. Murakami, Tomoyuki; Okuno, Yoshihiro // Physics of Plasmas;Mar2009, Vol. 16 Issue 3, p033501 

    The present paper describes high-density magnetohydrodynamic (MHD) energy conversion in a high-temperature seed-free argon plasma, for which a quasi-three-dimensional numerical simulation and a single-pulse shock-tunnel-based demonstration are conducted. The numerical model simulates the...

  • Non-Gaussian properties of global momentum and particle fluxes in a cylindrical laboratory plasma. Nagashima, Yoshihiko; Itoh, Sanae -I.; Inagaki, Shigeru; Arakawa, Hiroyuki; Kasuya, Naohiro; Fujisawa, Akihide; Kamataki, Kunihiro; Yamada, Takuma; Shinohara, Shunjiro; Oldenbürger, Stella; Yagi, Masatoshi; Takase, Yuichi; Diamond, Patrick H.; Itoh, Kimitaka // Physics of Plasmas;Jul2011, Vol. 18 Issue 7, p070701 

    Non-Gaussian statistical properties of the azimuthally averaged momentum and particle fluxes driven by turbulence have been simultaneously observed in inhomogeneous magnetized plasmas for the first time. We identified the stretched Gaussian distribution of the both fluxes and the transition from...

  • Measurements of neutral helium density in helicon plasmas. Houshmandyar, Saeid; Sears, Stephanie H.; Thakur, Saikat Chakraborty; Carr, Jerry; Galante, Matthew E.; Scime, Earl E. // Review of Scientific Instruments;Oct2010, Vol. 81 Issue 10, p10D704 

    Laser-induced-fluorescence (LIF) is used to measure the density of helium atoms in a helicon plasma source. For a pump wavelength of 587.725 nm (vacuum) and laser injection along the magnetic field, the LIF signal exhibits a signal decrease at the Doppler shifted central wavelength. The drop in...

  • The effects of plasma density and magnetic field on ion temperature and drift velocity in a LaB6 direct current plasma. Hyun-Jong Woo; Kyu-Sun Chung; Myoung-Jae Lee; Taihyeop Lho // Physics of Plasmas;Feb2009, Vol. 16 Issue 2, pN.PAG 

    In a LaB6 direct current plasma, parallel and perpendicular ion temperatures (Ti∥ and Ti⊥) were measured as a function of plasma density and magnetic field by a laser-induced fluorescence technique. In order to study the impacts of magnetic field and plasma density on ion temperature...

  • Destabilization of magnetosonic-whistler waves by a relativistic runaway beam. Fülöp, T.; Pokol, G.; Helander, P.; Lisak, M. // Physics of Plasmas;Jun2006, Vol. 13 Issue 6, p062506 

    Magnetosonic-whistler waves may be destabilized by runaway electrons both in fusion and astrophysical plasmas. A linear instability growth rate of these waves in the presence of a runaway avalanche is calculated both perturbatively and by numerical solution of the full dispersion equation. The...


Read the Article


Sorry, but this item is not currently available from your library.

Try another library?
Sign out of this library

Other Topics