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Blobs on the High Field Side of Tokamaks
KTH, School of Electrical Engineering (EES), Fusion Plasma Physics. KTH, School of Electrical Engineering (EES), Centres, Alfvén Laboratory Centre for Space and Fusion Plasma Physics.
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2010 (English)In: Plasma and Fusion Research, ISSN 1880-6821, E-ISSN 1880-6821, Vol. 5, no S2013Article in journal (Refereed) Published
Abstract [en]

Turbulence-induced high density filaments, blobs, might represent the new paradigm for radial convectivetransport in the Scrape-Off-Layer of magnetic fusion devices. Models for individual blob dynamics, consideringtheir generation on the Low Field Side (LFS) of the torus have been put forward. We investigate the existence ofblobs in the peripheral region of the High Field Side (HFS) of the FT-2 tokamak. Langmuir probe measurementsare used to detect and characterize blobs. The results were obtained in plasmas with enhanced Lower HybridHeating and data was acquired with a new fast data acquisition system with 50MHz sampling rate. While themajority of the blobs are observed to move towards the wall as expected, some are observed to move inwardstowards the core. This effect is not understood in the light of existing models for the LFS where only the outwarddirection is expected. Further characterization of plasma blobs should therefore involve both HFS and LFS. Thiscould be done at ASDEX Upgrade where reflectometry systems are capable of measuring simultaneously thedensity turbulence on both HFS and LFS. The dependence between radial velocity, size and density of the blobsis also investigated.

Place, publisher, year, edition, pages
2010. Vol. 5, no S2013
Keyword [en]
fusion, plasma turbulence, plasma transport, plasma blob, Langmuir probe
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-71312OAI: oai:DiVA.org:kth-71312DiVA: diva2:486646
Note
QC 20120131Available from: 2012-01-31 Created: 2012-01-31 Last updated: 2017-12-08Bibliographically approved

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