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Transport asymmetry and release mechanisms of metal dust in the reversed-field pinch configuration
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics.
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.ORCID iD: 0000-0001-7796-1887
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.ORCID iD: 0000-0002-6712-3625
KTH, School of Electrical Engineering (EES), Space and Plasma Physics.
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2014 (English)In: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 56, no 3, 035014- p.Article in journal (Refereed) Published
Abstract [en]

Experimental data on dust resident in the EXTRAP T2R reversed-field pinch are reported. Mobile dust grains are captured in situ by silicon collectors, whereas immobile grains are sampled post mortem from the wall by adhesive tape. The simulation of collection asymmetries by the MIGRAINe dust dynamics code in combination with the experimental results is employed to deduce some characteristics of the mechanism of intrinsic dust release. All evidence suggests that re-mobilization is dominant with respect to dust production.

Place, publisher, year, edition, pages
2014. Vol. 56, no 3, 035014- p.
Keyword [en]
dust, collection, dust dynamics, MIGRAINe
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:kth:diva-143703DOI: 10.1088/0741-3335/56/3/035014ISI: 000331896200014Scopus ID: 2-s2.0-84894272951OAI: oai:DiVA.org:kth-143703DiVA: diva2:708573
Funder
Swedish Research Council
Note

QC 20140328

Available from: 2014-03-28 Created: 2014-03-27 Last updated: 2017-12-05Bibliographically approved
In thesis
1. Experimental studies of materials migration in magnetic confinement fusion devices: Novel methods for measurement of macro particle migration, transport of atomic impurities and characterization of exposed surfaces
Open this publication in new window or tab >>Experimental studies of materials migration in magnetic confinement fusion devices: Novel methods for measurement of macro particle migration, transport of atomic impurities and characterization of exposed surfaces
2014 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

During several decades of research and development in the field of Magnetically Confined Fusion (MCF) the preferred selection of materials for Plasma Facing Components (PFC) has changed repeatedly. Without doubt, endurance of the first wall will decide research availability and lifespan of the first International Thermonuclear Research Reactor (ITER). Materials erosion, redeposition and mixing in the reactor are the critical processes responsible for modification of materials properties under plasma impact. This thesis presents several diagnostic techniques and their applications for studies of materials transport in fusion devices. The measurements were made at the EXTRAP T2R Reversed Field Pinch operated in Alfvén laboratory at KTH (Sweden), the TEXTOR tokamak, recently shut down at Forschungszentrum Jülich (Germany) and in the JET tokamak at CCFE (UK). The main outcomes of the work are:

  • Development and application of a method for non-destructive capture and characterization of fast dust particles moving in the edge plasma of fusion devices, as well as particles generated upon laser-assisted cleaning of plasma exposed surfaces. 
  • Advancement of conventional broad beam and micro ion beam techniques to include measurement of tritium in the surfaces exposed in future D-T experiments. 
  • Adaption of the micro ion beam method for precision mapping of non uniform elements concentrations on irregular surfaces. 
  • Implementation of an isotopic marker to study the large scale materials migration in a tokamak and development of a method for fast non destructive sampling of the marker on surfaces of PFCs.
Place, publisher, year, edition, pages
Stockholm: KTH Royal Institute of Technology, 2014. iv, 84 p.
Series
TRITA-EE, ISSN 1653-5146 ; 2014:024
Keyword
fusion, tokamak, RFP, divertor, limiter, SOL, transport, migration, surface analysis, IBA, ion micro beam, beryllium, tritium
National Category
Fusion, Plasma and Space Physics
Research subject
Physics
Identifiers
urn:nbn:se:kth:diva-145045 (URN)978-91-7595-147-8 (ISBN)
Public defence
2014-05-16, F3, Lindstedsvägen 26, KTH, Stockholm, 14:00 (English)
Opponent
Supervisors
Note

QC 20140508

Available from: 2014-05-08 Created: 2014-05-07 Last updated: 2014-05-08Bibliographically approved
2. Modelling the multifaceted physics of metallic dust and droplets in fusion plasmas
Open this publication in new window or tab >>Modelling the multifaceted physics of metallic dust and droplets in fusion plasmas
2016 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

Plasma-material interaction constitutes one of the major scientific and technological issues affecting the development of thermonuclear fusion power plants. In particular, the release of metallic dust and droplets from plasmafacing components is a crucial aspect of reactor operation. By penetrating into the burning plasma, these micrometric particles act as a source of impurities which tend to radiate away the plasma energy, cooling it down below the threshold temperatures for sustainable fusion reactions. By accumulating in the reactor chamber, dust particles tend to retain fuel elements, lowering the reactor efficiency and increasing its radioactivity content. Dust accumulation also increases the risk of explosive hydrogen production upon accidental air or water ingress in the vacuum chamber. Numerical dust transport codes provide the essential framework to guide theoretical and experimental dust studies by simulating the intricate couplings between the many physical processes driving dust dynamics in fusion plasmas. This thesis reports on the development and validation of the MIGRAINe code, which specifically targets plasma-surface interaction processes and the physics of dust particles impinging on plasma-facing components to address long-term dust migration and accumulation in fusion devices.

Place, publisher, year, edition, pages
KTH Royal Institute of Technology, 2016. 80 p.
Series
TRITA-EE, ISSN 1653-5146 ; 2016:084
National Category
Fusion, Plasma and Space Physics
Research subject
Electrical Engineering
Identifiers
urn:nbn:se:kth:diva-187638 (URN)978-91-7729-041-4 (ISBN)
Public defence
2016-06-13, E3, Osquars backe 14, Stockholm, 13:30 (English)
Opponent
Supervisors
Note

QC 20160525

Available from: 2016-05-25 Created: 2016-05-25 Last updated: 2016-05-26Bibliographically approved

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Vignitchouk, LadislasRatynskaia, SvetlanaTolias, PanagiotisFrassinetti, LorenzoBrunsell, Per R.

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