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  • 101.
    Vignitchouk, Ladislas
    et al.
    KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
    Tolias, Panagiotis
    KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
    Ratynskaia, Svetlana
    KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
    Dust-wall and dust-plasma interaction in the MIGRAINe code2014In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 56, no 9, p. 095005-Article in journal (Refereed)
    Abstract [en]

    The physical models implemented in the recently developed dust dynamics code MIGRAINe are described. A major update of the treatment of secondary electron emission, stemming from models adapted to typical scrape-off layer temperatures, is reported. Sputtering and plasma species backscattering are introduced from fits of available experimental data and their relative importance to dust charging and heating is assessed in fusion-relevant scenarios. Moreover, the description of collisions between dust particles and plasma-facing components, based on the approximation of elastic-perfectly plastic adhesive spheres, has been upgraded to take into account the effects of particle size and temperature.

  • 102. Wahlund, J. E.
    et al.
    Andre, M.
    Eriksson, A. I. E.
    Lundberg, M.
    Morooka, M. W.
    Shafiq, M.
    Averkarnp, T. F.
    Gurnett, D. A.
    Hospodarsk, G. B.
    Kurth, W. S.
    Jacobsen, K. S.
    Pedersen, A.
    Farrell, W.
    Ratynskaia, Svetlana V.
    KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
    Piskunov, N.
    Detection of dusty plasma near the E-ring of Saturn2009In: Planetary and Space Science, ISSN 0032-0633, E-ISSN 1873-5088, Vol. 57, no 14-15, p. 1795-1806Article in journal (Refereed)
    Abstract [en]

    We present several independent in-situ measurements, which provide evidence that charged dust in the E-ring interacts collectively with the dense surrounding plasma disk of Saturn, i.e., form a system of dust-plasma interaction. The results are based on data sampled by the Radio and Plasma Wave Science (RPWS) investigation onboard Cassini, which allows for interferometry of plasma density inhomogeneities (delta n/n) with two antenna elements and a Langmuir probe sensor. The interferometer experiment detects two ion populations: one co-rotating with the planetary magnetic field and another moving with near Keplerian speed around Saturn. The full range of RPWS measurements indicates that the Keplerian population consists of colder ions (T-i

  • 103. Weinzettl, V.
    et al.
    Matejicek, J.
    Ratynskaia, Svetlana V.
    KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
    Tolias, Panagiotis
    KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
    De Angeli, M.
    Riva, G.
    Dimitrova, M.
    Havlicek, J.
    Adamek, J.
    Seidl, J.
    Tomes, M.
    Cavalier, J.
    Imrisek, M.
    Havranek, A.
    Panek, R.
    Peterka, M.
    Dust remobilization experiments on the COMPASS tokamak2017In: Fusion engineering and design, ISSN 0920-3796, E-ISSN 1873-7196, Vol. 124, p. 446-449Article in journal (Refereed)
    Abstract [en]

    Dust remobilization is one of the not yet fully understood mechanisms connected to the prompt erosion of material from plasma facing surfaces in fusion devices. As a part of a newly initiated cross-machine study, dust remobilization experiments have been performed on the COMPASS tokamak. Tungsten samples with well-defined deposited tungsten dust grains, prepared using a recently developed controlled pre-adhesion method, have been exposed to ELMy H-mode discharges as well as L-mode discharges with forced disruptions. Here we report on the technical aspects of the experiment realization as well as on the experimental results of dust remobilization. The latter is discussed in the light of data from other machines and a physical interpretation is suggested for the observed spatial localization of the dust remobilization activity. Evidence of rearrangement of isolated dust into clusters and strings is also presented.

  • 104. Yaroshenko, V.
    et al.
    Ratynskaia, Svetlana V.
    Khrapak, S.
    Thoma, M. H.
    Kretschmer, M.
    Hofner, H.
    Morfill, G. E.
    Zobnin, A.
    Usachev, A.
    Petrov, O.
    Fortov, V.
    Determination of the ion-drag force in a complex plasma2005In: Physics of Plasmas, ISSN 1070-664X, E-ISSN 1089-7674, Vol. 12, no 9Article in journal (Refereed)
    Abstract [en]

    The ion-drag force acting on dust particles in the positive column of a dc discharge is measured in the pressure range of 20-120 Pa. The force is obtained by a method which does not require a priori knowledge of the particle charge, but uses the charge gradient determined from the same experiment. The method depends only on two experimentally determined quantities: the particle drift velocity and the electric field. The comparison of experimental results with theoretical models is presented and discussed.

  • 105. Yaroshenko, V. V.
    et al.
    Ratynskaia, Svetlana V.
    Khrapak, S. A.
    Thoma, M. H.
    Kretschmer, M.
    Morfill, G. E.
    Measurements of the dust-ion momentum transfer frequency and ion drag force in complex plasmas2005In: Contributions to Plasma Physics, ISSN 0863-1042, E-ISSN 1521-3986, Vol. 45, no 04-mar, p. 223-228Article in journal (Refereed)
    Abstract [en]

    A simple self-consistent method to estimate the effect of the streaming ions on microparticles in a positive column of a dc discharge plasma is presented. The momentum transfer frequency in dust-ion collisions and the ion drag force are determined within a wide range of gas pressures, p = 20 - 120 Pa. The method does not require a priory knowledge of the particle charge, but involves only the particle charge gradient which is recovered from the same experimental data. The method depends only on two experimental quantities: dust particle drift velocity and electric field, thus minimizing the errors in the estimates. Reasonable agreement is found between our force measurements and theoretical predictions, corresponding to the regime of moderate ion-dust particle coupling.

  • 106.
    Yaroshenko, V.V.
    et al.
    Max-Planck-Institute für extraterrestriche Physik, Germany.
    Ratynskaia, Svetlana V.
    KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
    Olson, Jonas
    KTH, School of Electrical Engineering (EES). KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
    Brenning, Nils
    KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
    Wahlund, J.-E.
    Swedish Instituet of Space Physics, Uppsala.
    Morooka, M.
    Swedish Institute of Space Physics, Uppsala.
    Kurth, W.S.
    Department of Physics and Astronomy, University of Iowa, USA.
    Gurnett, D.A.
    Department of Physics and Astronomy, University of Iowa, USA.
    Morfill, G.E.
    Characteristics of charged dust inferred from the Cassini RPWS measurements in the vicinity of Enceladus2009In: Planetary and Space Science, ISSN 0032-0633, E-ISSN 1873-5088, Vol. 57, no 14-15, p. 1807-1812Article in journal (Refereed)
    Abstract [en]

    The data obtained by the Cassini Radio and Plasma Wave Science (RPWS) instrument during the shallow (17.02.2005) and the steep (14.07.2005) crossings of the E-ring revealed a considerable electron depletion in proximity to Enceladus's orbit (the difference between the ion and electron densities can reach similar to 70 cm(-3)). Assuming that this depletion is a signature of the presence of charged dust particles, the main characteristics of dust down to submicron sized particles are derived. The differential size distribution is found to be well described by a power law with an index mu similar to 5.5-6 for the lower size limit a(min) = 0.03 mu m and mu similar to 7.3-8 for a(min) = 0.1 mu m. The calculated average integral dust number density is weakly affected by values of mu and a(min). For a greater than or similar to 0.1 mu m, both flybys gave the maximum dust density about 0.1-0.3 cm(-3) in the vicinity of Enceladus. Our results imply that the dust structure near Enceladus is characterized by approximately the same vertical length scale of 8000 km and reaches a maximum at the same radial distance (displaced outward of the orbit of Enceladus) as found by Kempf et al. [2008. The E-ring in the vicinity of Enceladus. Spatial distribution and properties of the ring particles. Icarus 193, 420-437], from the dust impact data.

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