232
edits
Esolano
Joined 5 May 2010
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→JET experimental studies
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=== JET experimental studies === | === JET experimental studies === | ||
'''Study of high temperature pedestals''' | |||
Specific experiments were made at JET to study high temperature [[Pedestal|pedestal]]s, in the range Te_ped ~2.5-5 keV. The idea was to see if the [[Edge Localized Modes|ELMs]] are qualitatively different when resistivity and collisionality are low. The surprising result of the experiment was a new insight on pedestal stability: with low gas fuelling and low recycling conditions (required to achieve high temperature pedestals) an Outer Mode often appears, delaying ELMs. The outer mode had been assumed to be an ideal kink, unstable in the steep gradient region of the pedestal, which would eventually grow into an ELM. We have now found that the outer mode is a fairly stable current ribbon, lasting as much as 1.5 s, located at the top of the pedestal. There are tantalising similarities with the EHO observed in DIII-D. This could provide a new route to ELM-free operation. | Specific experiments were made at JET to study high temperature [[Pedestal|pedestal]]s, in the range Te_ped ~2.5-5 keV. The idea was to see if the [[Edge Localized Modes|ELMs]] are qualitatively different when resistivity and collisionality are low. The surprising result of the experiment was a new insight on pedestal stability: with low gas fuelling and low recycling conditions (required to achieve high temperature pedestals) an Outer Mode often appears, delaying ELMs. The outer mode had been assumed to be an ideal kink, unstable in the steep gradient region of the pedestal, which would eventually grow into an ELM. We have now found that the outer mode is a fairly stable current ribbon, lasting as much as 1.5 s, located at the top of the pedestal. There are tantalising similarities with the EHO observed in DIII-D. This could provide a new route to ELM-free operation. | ||
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*''High Temperature Pedestals in JET and confined current filaments'' [http://epsppd.epfl.ch/Sofia/pdf/O2_020.pdf E.R. Solano et al EPS 2010 Oral] | *''High Temperature Pedestals in JET and confined current filaments'' [http://epsppd.epfl.ch/Sofia/pdf/O2_020.pdf E.R. Solano et al EPS 2010 Oral] | ||
'''Study of ELMs (Edge Localised Modes)''' | |||
Pedestal width and [[Edge Localized Modes|ELM]] size identity studies in JET and DIII-D; implications for ITER | Pedestal width and [[Edge Localized Modes|ELM]] size identity studies in JET and DIII-D; implications for ITER | ||
M N A Beurskens et al. [http://dx.doi.org/10.1088/0741-3335/51/12/124051 2009 Plasma Phys. Control. Fusion 51 124051] | M N A Beurskens et al. [http://dx.doi.org/10.1088/0741-3335/51/12/124051 2009 Plasma Phys. Control. Fusion 51 124051] | ||
'''Study of transport barrier formation''' | |||
[http://www.fusion.ciemat.es/AR/2007/Referencias/Ref%20I.1.2.2.pdf Plasma evolution towards transport barrier formation] | [http://www.fusion.ciemat.es/AR/2007/Referencias/Ref%20I.1.2.2.pdf Plasma evolution towards transport barrier formation] | ||