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Energy loss of test charges in a dusty plasma in the presence of dynamical grain charging, in New Vistas in Dusty Plasmas
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
2005 (English)In: New Vistas in Dusty Plasmas / [ed] Boufendi, L; Mikikian, M; Shukla, PK, 2005, Vol. 799, 490-493 p.Conference paper, Published paper (Refereed)
Abstract [en]

Thedynamical charging of dust grains is an important process andis found to enhance the shielding of a test chargepassing through a multi-component dusty plasma. In the present work,the energy loss of a test charge projectile passing througha dusty plasma in the presence of dynamical grain chargingis studied. The electric forces can be written in termsof the Maxwell stress tensor for a sphere around thetest charge. For sphere with radius tending to zero theforce is just that on the test charge. For afinite radius, forces on the plasma are also included whichmakes it possible to see how the force on thetest charge is balanced by the force on the plasma.The method fails for the zero radius but the dragforce can be found from a simple physical model. Thegeneral analytical results are presented and are compared with theprevious results.

Place, publisher, year, edition, pages
2005. Vol. 799, 490-493 p.
Series
AIP CONFERENCE PROCEEDINGS, ISSN 0094-243X ; 799
Keyword [en]
dusty plasmas, complex plasmas, test charge, drag force, energy loss, dynamical grain charging
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-6233DOI: 10.1063/1.2134672ISI: 000234508900106Scopus ID: 2-s2.0-33750357760ISBN: 0-7354-0287-6 (print)OAI: oai:DiVA.org:kth-6233DiVA: diva2:10883
Conference
4th International Conference on Physics of Dusty Plasmas. Orleans, FRANCE. JUN 13-17, 2005
Note
QC 20100920 QC 20111014Available from: 2006-10-06 Created: 2006-10-06 Last updated: 2011-10-14Bibliographically approved
In thesis
1. Test Charge Response of a Dusty Plasma with Grain Size Distribution and Charging Dynamics
Open this publication in new window or tab >>Test Charge Response of a Dusty Plasma with Grain Size Distribution and Charging Dynamics
2006 (English)Doctoral thesis, comprehensive summary (Other scientific)
Abstract [en]

This doctoral thesis reports analytical and numerical results for the electrostatic response of a dusty plasma to a moving test charge. Two important physical aspects of dusty plasmas, namely grain size distribution and grain charging dynamics were taken into account. In the first case, a dusty plasma in thermal equilibrium and with a distribution of grain sizes is considered. A size distribution is assumed which decreases exponentially with the grain mass for large sizes and gives a simple smooth reduction for small sizes. The electrostatic response to a slowly moving test charge, using a second order approximation is found and the effects of collisions are also investigated. It turns out that for this particular size distribution, there is a remarkably simple result that the resulting effective distribution for the electrostatic response is a kappa (generalized Lorentzian) distribution. In the second case, we present an analytical model for the shielding of a slowly moving test charge in a dusty plasma with dynamical grain charging for cases both with and without the collision effects. The response potential is treated as a power series in test charge velocity. Analytical expressions for the response potential are found up to second order in test charge velocity. The first-order dynamical charging term is shown to be the consequence of the delay in the shielding due to the dynamics of the charging process. It is concluded that the dynamical charging of the grains in a dusty plasma enhances the shielding of a test charge. To clarify the physics, a separate study is made where the charging is approximated by using a time delay. The resulting potential shows the delayed shielding effect explicitly. The terms in the potential that depend on the charging dynamics involve a spatial shift given by the test charge velocity and the charging time. The wake potential of a fast moving test charge in the case of grain charging dynamics was also found. It was observed that the grain charging dynamics leads to a spatial damping and a phase shift in the potential response. Finally, combining these two physical aspects, generalized results for the electrostatic potential were found incorporating the terms from both grain size distribution and grain charging dynamics. The generalized results contain the previous work where these two effects were studied separately and which can now be found as special limiting cases. This kind of work has relevance both in space and astrophysical plasmas.

Place, publisher, year, edition, pages
Stockholm: KTH, 2006. xviii, 65 p.
Series
Trita-EE, ISSN 1653-5146 ; 2006:045
Keyword
Dusty plasmas, Complex plasmas, Grain size distribution, Grain charging dynamics, Lorentzian distribution, Kappa distribution, Test charge response, Delayed shielding, Energy loss, Drag force, Wake field.
National Category
Fusion, Plasma and Space Physics
Identifiers
urn:nbn:se:kth:diva-4134 (URN)91-7178-463-2 (ISBN)
Public defence
2006-10-31, KTHB Salongen, Main Library, Osquars Backe 31, Stockholm, 10:00
Opponent
Supervisors
Note
QC 20100920Available from: 2006-10-06 Created: 2006-10-06 Last updated: 2011-10-28Bibliographically approved

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