5 results found
Rizopoulou N, Bacharis M, 2018, Emitting large dust grains: floating potential and potential wells, Physics of Plasmas, Vol: 25, ISSN: 1070-664X
In this paper we present a new theory, Modified Orbital Motion Limited - EMission, which examines the effect of electron emission on the charging of large dust grains. One of the most important aspects is the calculation of the particle's floating potential, which is the potential that the dust acquires when it is in contact with the plasma. Our theory determines the floating potential on the surface of the dust grain and predicts the formation of a potential well. Our model is applied in the Dust in TOKamakS (DTOKS) dust transport code and it is compared with DTOKS' pre-existing model.
The charging of a large dust grain immersed in a flowing plasma is important for the study of several phenomena and in many applications. It is shown that in order to understand the charging mechanism of large dust grains, it is of great importance to take into account and calculate the effect of plasma flows on the sheath that develops around them.
Rizopoulou N, Robinson APL, Coppins M, et al., 2014, Electron emission in a source-collector sheath system: a kinetic study, Physics of Plasmas, Vol: 21, ISSN: 1070-664X
The classical source-collector sheath system describes a plasma that forms between a Maxwellian source and an absorbing wall. The plasma is assumed to be collisionless and without ionization. Two distinct areas are being formed: the collector sheath, an ion-rich region in contact with the absorbing boundary, and the source sheath, which is an electron-rich area near the Maxwellian source. In this work, we study a modified version of the classical source-collector sheath system, where the wall is no longer absorbing but emits electrons. As a result, we have two different types of collector sheath, one where a potential well is formed and one without a potential well. We examine the effect of electron emission for a range of conditions for the plasma and the emitted electrons. In the first part of this work, we study the problem analytically, and in the second, using our kinetic Vlasov code, Yggdrasil. The simulation results are in very good agreement with the predictions of our theoretical model.I. INTRODUCTION
Rizopoulou N, Robinson APL, Coppins M, et al., 2013, A kinetic study of the source-collector sheath system in a drifting plasma, PLASMA SOURCES SCIENCE & TECHNOLOGY, Vol: 22, ISSN: 0963-0252
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