Change search
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf
Trapped electron mode driven electron heat transport in JET: experimental investigation and gyro-kinetic theory validation
Ist Fis Plasma CNR, I-20125 Milan, Italy. Culham Sci Ctr, JET, EUROfus Consortium, Abingdon OX14 3DB, Oxon, England.;Ist Fis Plasma CNR, I-20125 Milan, Italy.;Univ Milano Bicocca, I-20126 Milan, Italy..
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Fusion Plasma Physics.
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Fusion Plasma Physics.
KTH, School of Electrical Engineering and Computer Science (EECS), Electrical Engineering, Fusion Plasma Physics.
Show others and affiliations
Number of Authors: 11152015 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 55, no 11, article id 113016Article in journal (Refereed) Published
Abstract [en]

The main purpose of this work is to study the dependence of trapped electron modes (TEM) threshold and of electron stiffness on the most relevant plasma parameters. Dedicated transport experiments based on heat flux scans and T-e modulation have been performed in JET in TEM dominated plasmas with pure ICRH electron heating and a numerical study using gyrokinetic simulations has been performed with the code GKW. Using multilinear regressions on the experimental data, the stabilizing effect of magnetic shear predicted by theory for our plasma parameters is confirmed while no significant effect of safety factor was found. Good quantitative agreement is found between the TEM thresholds found in the experiments and calculated with linear GKW simulations. Non-linear simulations have given further confirmation of the threshold values and allowed comparison with the values of stiffness found experimentally. Perturbative studies using RF power modulation indicate the existence of an inward convective term for the electron heat flux. Adding NBI power, ion temperature gradient (ITG) modes become dominant and a reduction of vertical bar del T-e vertical bar/T-e with respect to pure ICRH, TEM dominant discharges has been experimentally observed, in spite of increased total electron power. Possible explanations are discussed.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2015. Vol. 55, no 11, article id 113016
Keywords [en]
electron heat transport, plasma micro-instabilities, plasma gyrokinetic simulations
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:kth:diva-270479DOI: 10.1088/0029-5515/55/11/113016ISI: 000366528700019Scopus ID: 2-s2.0-84946094069OAI: oai:DiVA.org:kth-270479DiVA, id: diva2:1424215
Note

QC 20200416

Available from: 2020-04-16 Created: 2020-04-16 Last updated: 2020-04-16Bibliographically approved

Open Access in DiVA

No full text in DiVA

Other links

Publisher's full textScopus

Search in DiVA

By author/editor
Bergsåker, HenricBykov, IgorElevant, ThomasFrassinetti, LorenzoGarcia-Carrasco, AlvaroHellsten, TorbjörnIvanova, DaryaJohnson, ThomasMenmuir, SheenaPetersson, PerRachlew, ElisabethRubel, MarekStröm, PetterTholerus, EmmiWeckmann, Armin
By organisation
Fusion Plasma PhysicsFusion Plasma PhysicsPhysics
In the same journal
Nuclear Fusion
Fusion, Plasma and Space Physics

Search outside of DiVA

GoogleGoogle Scholar

doi
urn-nbn

Altmetric score

doi
urn-nbn
Total: 8 hits
CiteExportLink to record
Permanent link

Direct link
Cite
Citation style
  • apa
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
More languages
Output format
  • html
  • text
  • asciidoc
  • rtf