Debye shielding in a nonextensive plasma

Ait Gougam, Leila; Tribeche, Mouloud
June 2011
Physics of Plasmas;Jun2011, Vol. 18 Issue 6, p062102
Academic Journal
The phenomenon of Debye Shielding is revisited within the theoretical framework of the Tsallis statistical mechanics. The plasma consists of nonextensive electrons and ions. Both the effective Debye length λDq and the fall-off of the electrostatic potential [uppercase_phi_synonym] are considered and a parameter study conducted. Owing to electron nonextensivity, the critical Mach number derived from the modified Bohm sheath criterion may become less than unity allowing therefore ions with speed less than ion-acoustic speed to enter the sheath from the main body of the plasma. Considering the wide relevance of collective processes, our analysis may be viewed as a first step toward a more comprehensive Debye shielding and electrostatic plasma sheath in nonequilibrium plasmas.


Related Articles

  • Shock Wave Propagation in a Dusty Plasma Crystal. Bailung, H.; Sharma, S. K.; Bhagoboty, N.; Nakamura, Y. // AIP Conference Proceedings;11/28/2011, Vol. 1397 Issue 1, p287 

    Excitation and propagation of shock wave in a plasma crystal formed in the sheath of a rf discharge plasma have been reported. The observed wave propagation is recorded using the digital camera. The Mach number of the shock wave is found to be ∼1.4.

  • Comment on 'Debye shielding in a nonextensive plasma' [Phys. Plasmas 18, 062102 (2011)]. Rios, L. A.; Galvão, R. M. O.; Cirto, L. // Physics of Plasmas;Mar2012, Vol. 19 Issue 3, p034701 

    Gougam and Tribeche [Phys. Plasmas 18, 062102 (2011)] revisit the phenomenon of Debye shielding within the theoretical framework of Tsallis statistical mechanics. The effect of electron nonextensivity on the Bohm sheath criterion is also investigated, and a modified critical Mach number is...

  • Effects of energetic electrons on magnetized electrostatic plasma sheaths. Tskhakaya, D.; Kuhn, S.; Petrzˇilka, V.; Khanal, R. // Physics of Plasmas;Jun2002, Vol. 9 Issue 6, p2486 

    The influence of energetic electrons on magnetized plasma sheaths is studied for different current regimes and different secondary-electron emission coefficients. (Here, the term "plasma sheath" denotes the collisionless region consisting of the non-neutral Debye sheath and the quasi-neutral...

  • Experimental study of a photoelectron sheath. Dove, Adrienne; Horanyi, Mihaly; Wang, Xu; Piquette, Marcus; Poppe, Andrew R.; Robertson, Scott // Physics of Plasmas;Apr2012, Vol. 19 Issue 4, p043502 

    We describe a set of laboratory experiments to reproduce and investigate the photoelectron layer that occurs above UV-illuminated surfaces in space. The experiments are done in vacuum with UV illumination at 172 nm that is sufficiently intense for the creation of a photoelectron layer above a...

  • The effect of charge separation on nonlinear electrostatic waves in a magnetized dusty plasma with two-temperature ions. Maharaj, S. K.; Bharuthram, R.; Pillay, S. R.; Singh, S. V.; Reddy, R. V.; Lakhina, G. S. // AIP Conference Proceedings;9/7/2008, Vol. 1041 Issue 1, p305 

    In view of the observations of parallel (to Earth’s magnetic field) spiky electric field structures by the FAST satellite, a theoretical study is conducted using a dusty plasma model comprising Boltzmann distributed hot and cool ions, Boltzmann electrons and a negatively charged cold dust...

  • A computational model and experimental validation of shielding and amplifying effects at a crack tip near perpendicular strength-mismatched interfaces. Bhat, Sunil; Narayanan, S. // Acta Mechanica;Jan2011, Vol. 216 Issue 1-4, p259 

    The stress field around the crack tip near an elastically matched but strength-mismatched interface body in a bimetallic system is influenced when the crack tip yield or cohesive zone spreads to the interface body. The concept of crack tip stress intensity parameter, K, is therefore employed in...

  • Three-dimensional effects in trailing mass in the wire-array Z pinch. Yu, Edmund P.; Cuneo, M. E.; Desjarlais, M. P.; Lemke, R. W.; Sinars, D. B.; Haill, T. A.; Waisman, E. M.; Bennett, G. R.; Jennings, C. A.; Mehlhorn, T. A.; Brunner, T. A.; Hanshaw, H. L.; Porter, J. L.; Stygar, W. A.; Rudakov, L. I. // Physics of Plasmas;May2008, Vol. 15 Issue 5, p056301 

    The implosion phase of a wire-array Z pinch is investigated using three-dimensional (3D) simulations, which model the mass ablation phase and its associated axial instability using a mass injection boundary condition. The physical mechanisms driving the trailing mass network are explored, and it...

  • The Bohm criterion for the dusty plasma sheath. Jin-Yuan Liu; Zheng-Xiong Wang, Y.; Xiaogang Wang; Qiang Zhang; Xiu Zou, Y.; Yu Zhang // Physics of Plasmas;Sep2003, Vol. 10 Issue 9, p3507 

    The Bohm criterion for the dusty plasma sheath is investigated with a fluid model. It is shown that the presence of dust particles near the interface between the bulk plasma and the sheath should have effects upon the ion Mach number. The dust particles charging and density variation are taken...

  • Sheath formation under collisional conditions in presence of dust. Moulick, R.; Goswami, K. S. // Physics of Plasmas;2014, Vol. 21 Issue 8, p1 

    Sheath formation is studied for collisional plasma in presence of dust. In common laboratory plasma, the dust acquires negative charges because of high thermal velocity of the electrons. The usual dust charging theory dealing with the issue is that of the Orbit Motion Limited theory. However,...


Read the Article


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

Try another library?
Sign out of this library

Other Topics