Spokes and charged particle transport in HiPIMS magnetrons
2013 (English)In: Journal of Physics D: Applied Physics, ISSN 0022-3727, E-ISSN 1361-6463, Vol. 46, no 8, 084005- p.Article in journal (Refereed) Published
Two separate scientific communities are shown to have studied one common phenomenon, azimuthally rotating dense plasma structures, also called spokes, in pulsed-power E x B discharges, starting from quite different approaches. The first body of work is motivated by fundamental plasma science and concerns a phenomenon called the critical ionization velocity, CIV, while the other body of work is motivated by the applied plasma science of high power impulse magnetron sputtering (HiPIMS). Here we make use of this situation by applying experimental observations, and theoretical analysis, from the CIV literature to HiPIMS discharges. For a practical example, we take data from observed spokes in HiPIMS discharges and focus on their role in charged particle transport, and in electron energization. We also touch upon the closely related questions of how they channel the cross-B discharge current, how they maintain their internal potential structure and how they influence the energy spectrum of the ions? New particle-in-cell Monte Carlo collisional simulations that shed light on the azimuthal drift and expansion of the spokes are also presented.
Place, publisher, year, edition, pages
2013. Vol. 46, no 8, 084005- p.
Velocity Rotating Plasma, Ionization, Parameters, Discharge, Space, Gas
IdentifiersURN: urn:nbn:se:kth:diva-119035DOI: 10.1088/0022-3727/46/8/084005ISI: 000314475600006ScopusID: 2-s2.0-84873889078OAI: oai:DiVA.org:kth-119035DiVA: diva2:609924
FunderSwedish Research CouncilSwedish Foundation for Strategic Research
QC 201303082013-03-082013-03-052013-03-08Bibliographically approved