dc.creator | Ryter, F. | es |
dc.creator | Fischer, R. | es |
dc.creator | Fuchs, C. | es |
dc.creator | Happel, T. | es |
dc.creator | McDermott, R. M. | es |
dc.creator | Viezzer, Eleonora | es |
dc.creator | Wolfrum, E. | es |
dc.creator | Barrera Orte, L. | es |
dc.creator | Bernert, M. | es |
dc.creator | Burckhart, A. | es |
dc.creator | Graça, S. da | es |
dc.creator | Kurzan, B. | es |
dc.creator | McCarthy, P. | es |
dc.creator | Pütterich, T. | es |
dc.creator | Suttrop, W. | es |
dc.creator | Willensdorfer, M. | es |
dc.date.accessioned | 2018-09-17T11:56:51Z | |
dc.date.available | 2018-09-17T11:56:51Z | |
dc.date.issued | 2017 | |
dc.identifier.citation | Ryter, F., Fischer, R., Fuchs, C., Happel, T., McDermott, R.M., Viezzer, E.,...,Willensdorfer, M. (2017). I-mode studies at ASDEX Upgrade: L-I and I-H transitions, pedestal and confinement properties. Nuclear Fusion, 57, 016004 (23pp). | |
dc.identifier.issn | 1741-4326 | es |
dc.identifier.uri | https://hdl.handle.net/11441/78565 | |
dc.description.abstract | The I-mode is a plasma regime obtained when the usual L-H power threshold is high, e.g.
with unfavourable ion
B
∇
direction. It is characterised by the development of a temperature
pedestal while the density remains roughly as in the L-mode. This leads to a confinement
improvement above the L-mode level which can sometimes reach H-mode values. This
regime, already obtained in the ASDEX Upgrade tokamak about two decades ago, has
been studied again since 2009 taking advantage of the development of new diagnostics
and heating possibilities. The I-mode in ASDEX Upgrade has been achieved with different
heating methods such as NBI, ECRH and ICRF. The I-mode properties, power threshold,
pedestal characteristics and confinement, are independent of the heating method. The power
required at the L-I transition exhibits an offset linear density dependence but, in contrast
to the L-H threshold, depends weakly on the magnetic field. The L-I transition seems to be
mainly determined by the edge pressure gradient and the comparison between ECRH and
NBI induced L-I transitions suggests that the ion channel plays a key role. The I-mode often
evolves gradually over a few confinement times until the transition to H-mode which offers
a very interesting situation to study the transport reduction and its link with the pedestal
formation. Exploratory discharges in which
n
=
2 magnetic perturbations have been applied
indicate that these can lead to an increase of the I-mode power threshold by flattening the edge
pressure at fixed heating input power: more heating power is necessary to restore the required
edge pressure gradient. Finally, the confinement properties of the I-mode are discussed in
detail. | es |
dc.description.sponsorship | European Commission (EUROfusion 633053) | es |
dc.format | application/pdf | es |
dc.language.iso | eng | es |
dc.publisher | IOP Publishing | es |
dc.relation.ispartof | Nuclear Fusion, 57, 016004 (23pp). | |
dc.rights | Attribution-NonCommercial-NoDerivatives 4.0 Internacional | * |
dc.rights.uri | http://creativecommons.org/licenses/by-nc-nd/4.0/ | * |
dc.subject | Tokamak | es |
dc.subject | Transport | es |
dc.subject | Pedestal | es |
dc.subject | I-mode | es |
dc.subject | H-mode | es |
dc.title | I-mode studies at ASDEX Upgrade: L-I and I-H transitions, pedestal and confinement properties | es |
dc.type | info:eu-repo/semantics/article | es |
dcterms.identifier | https://ror.org/03yxnpp24 | |
dc.type.version | info:eu-repo/semantics/submittedVersion | es |
dc.rights.accessRights | info:eu-repo/semantics/openAccess | es |
dc.contributor.affiliation | Universidad de Sevilla. Departamento de Física Atómica, Molecular y Nuclear | es |
dc.relation.projectID | 633053 | es |
dc.relation.publisherversion | http://iopscience.iop.org/article/10.1088/0029-5515/57/1/016004/meta | es |
dc.identifier.doi | 10.1088/0029-5515/57/1/016004 | es |
idus.format.extent | 23 | es |
dc.journaltitle | Nuclear Fusion | es |
dc.publication.volumen | 57 | es |
dc.publication.initialPage | 016004 (23pp) | es |
dc.identifier.sisius | 21063812 | |
dc.contributor.funder | European Commission (EC) | |