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Transport asymmetry and release mechanisms of metal dust in the reversed-field pinch configuration
KTH, Skolan för elektro- och systemteknik (EES), Fusionsplasmafysik.
KTH, Skolan för elektro- och systemteknik (EES), Rymd- och plasmafysik.ORCID-id: 0000-0001-7796-1887
KTH, Skolan för elektro- och systemteknik (EES), Rymd- och plasmafysik.ORCID-id: 0000-0002-6712-3625
KTH, Skolan för elektro- och systemteknik (EES), Rymd- och plasmafysik.
Vise andre og tillknytning
2014 (engelsk)Inngår i: Plasma Physics and Controlled Fusion, ISSN 0741-3335, E-ISSN 1361-6587, Vol. 56, nr 3, s. 035014-Artikkel i tidsskrift (Fagfellevurdert) 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.

sted, utgiver, år, opplag, sider
2014. Vol. 56, nr 3, s. 035014-
Emneord [en]
dust, collection, dust dynamics, MIGRAINe
HSV kategori
Identifikatorer
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, id: diva2:708573
Forskningsfinansiär
Swedish Research Council
Merknad

QC 20140328

Tilgjengelig fra: 2014-03-28 Laget: 2014-03-27 Sist oppdatert: 2017-12-05bibliografisk kontrollert
Inngår i avhandling
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
Åpne denne publikasjonen i ny fane eller vindu >>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 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.
sted, utgiver, år, opplag, sider
Stockholm: KTH Royal Institute of Technology, 2014. s. iv, 84
Serie
TRITA-EE, ISSN 1653-5146 ; 2014:024
Emneord
fusion, tokamak, RFP, divertor, limiter, SOL, transport, migration, surface analysis, IBA, ion micro beam, beryllium, tritium
HSV kategori
Forskningsprogram
Fysik
Identifikatorer
urn:nbn:se:kth:diva-145045 (URN)978-91-7595-147-8 (ISBN)
Disputas
2014-05-16, F3, Lindstedsvägen 26, KTH, Stockholm, 14:00 (engelsk)
Opponent
Veileder
Merknad

QC 20140508

Tilgjengelig fra: 2014-05-08 Laget: 2014-05-07 Sist oppdatert: 2014-05-08bibliografisk kontrollert
2. Modelling the multifaceted physics of metallic dust and droplets in fusion plasmas
Åpne denne publikasjonen i ny fane eller vindu >>Modelling the multifaceted physics of metallic dust and droplets in fusion plasmas
2016 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
KTH Royal Institute of Technology, 2016. s. 80
Serie
TRITA-EE, ISSN 1653-5146 ; 2016:084
HSV kategori
Forskningsprogram
Elektro- och systemteknik
Identifikatorer
urn:nbn:se:kth:diva-187638 (URN)978-91-7729-041-4 (ISBN)
Disputas
2016-06-13, E3, Osquars backe 14, Stockholm, 13:30 (engelsk)
Opponent
Veileder
Merknad

QC 20160525

Tilgjengelig fra: 2016-05-25 Laget: 2016-05-25 Sist oppdatert: 2016-05-26bibliografisk kontrollert

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