Abstract
The propagation of a cold pulse initiated by edge cooling in JET is compared to propagation of the heat wave
originating from a modulation of the heating source roughly at mid radius. It is found that the propagation of the
cold pulse is by far faster than what could be predicted on the basis of the heat wave propagation, and within local
transport models no sufficient explanation for this behaviour can be found. Recently, modelling of the cold pulse
propagation using non-local effects and a transport equation that uses fractional derivatives has been successfully
applied to model the effect [1]. Here we discuss a model in which the non-locality is introduced by the process
of turbulence spreading. Transport models with turbulence spreading have been proposed in [2] and conditions
under which the perturbation in the turbulence profile could travel at the required high speed from edge to the
core have been established [3]. Here we report on recent results in the modelling of cold pulse propagation using
turbulence spreading transport models.
Original language | English |
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Title of host publication | Proceedings |
Volume | 8 |
Publisher | The Japan Society of Plasma Science and Nuclear Fusion Research |
Publication date | 2009 |
Pages | 55-58 |
Publication status | Published - 2009 |
Event | 14th International Congress on Plasma Physics - Fukuoka, Japan Duration: 8 Sept 2008 → 12 Sept 2008 Conference number: 14 http://www.triam.kyushu-u.ac.jp/ICPP/ |
Conference
Conference | 14th International Congress on Plasma Physics |
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Number | 14 |
Country/Territory | Japan |
City | Fukuoka |
Period | 08/09/2008 → 12/09/2008 |
Internet address |
Series | Journal of Plasma and Fusion Research SERIES |
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Number | 8 |
ISSN | 1883-9630 |
Keywords
- Fusion energy