E Wolfrum et al 2009 Plasma Phys. Control. Fusion 51 124057 doi:10.1088/0741-3335/51/12/124057
E Wolfrum, A Burckhart, R Fischer, N Hicks, C Konz, B Kurzan, B Langer, T Pütterich, H Zohm and the ASDEX Upgrade Team
Show affiliationsIntegrated data analysis and equilibrium reconstruction on a millisecond time base are used to gain edge profiles with high spatial and temporal resolution. The measured radial electric field profiles for a series of discharges with different gas fuelling levels show their minimum at the position of maximal ratio of pressure gradient and density (∇p/n). The analysis of electron density and temperature profiles in between edge localized modes (ELMs) reveals a characteristic sequence of phases, starting with a fast recovery phase, a quiet pressure build-up phase and a strongly fluctuating phase before the next ELM breaks out. These phases are described in terms of profile development, the behaviour of maximal gradients as well as their positions.
52.55.Fa Tokamaks, spherical tokamaks
52.40.Hf Plasma-material interactions; boundary layer effects
Issue 12 (December 2009)
Received 19 June 2009, in final form 24 September 2009
Published 16 November 2009
E Wolfrum et al 2009 Plasma Phys. Control. Fusion 51 124057
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