Comparative analysis of intermittent burst temporal characteristics at the edge of the CASTOR and Tore Supra tokamaks
PHYSICS OF PLASMAS(2009)
摘要
Temporal characteristics of intermittent positive bursts of plasma density in the scrape-off layer of the CASTOR and Tore Supra tokamaks are investigated. A monotonic radial decrease of average burst rate together with an increase of average burst duration is observed in the Tore Supra tokamak [I. Nanobashvili , Czech. J. Phys. 56, 1339 (2006); I. Nanobashvili , J. Nucl. Mater. 363-365, 622 (2007)]. At the edge of the CASTOR tokamak the temporal characteristics stay nearly constant within a quite wide radial region. The reason is that radially elongated turbulent structures (streamers) govern the radial transport in CASTOR [P. Devynck , Phys. Plasmas 13, 102505 (2006)]. A comparative analysis allows to conclude that radial transport at the edge of the Tore Supra tokamak is governed by blob-like structures. Plasma biasing at the edge of CASTOR significantly modifies the burst characteristics, reduces plasma transport, and considerably improves the confinement.
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关键词
plasma boundary layers,plasma density,plasma toroidal confinement,plasma transport processes,plasma turbulence,Tokamak devices
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