Repository logo

Infoscience

  • English
  • French
Log In
Logo EPFL, École polytechnique fédérale de Lausanne

Infoscience

  • English
  • French
Log In
  1. Home
  2. Academic and Research Output
  3. Conferences, Workshops, Symposiums, and Seminars
  4. On the effects of the equilibrium model in gyrokinetic simulatins: From s-alpha to diverted MHD equilibrium
 
Loading...
Thumbnail Image
conference paper

On the effects of the equilibrium model in gyrokinetic simulatins: From s-alpha to diverted MHD equilibrium

Burckel, Alice  
•
Sauter, Olivier  orcid-logo
•
Angioni, Clemente  
Show more
2010
Journal of Physics: Conference Series
Theory of Fusion Pasmas: Joint Varenna-Lausanne Int. Workshop

In order to better identify the role of the magnetic topology on ITG and TEM instabilities, different MHD equilibria with increasing complexity are calculated using the CHEASE code [1]. We start from the geometry of the s-alpha cyclone benchmark case [2], consider the corresponding circular numerical equilibrium, and then successively add a non zero value of alpha consistent with the kinetic profiles, an elongation of 1.68, a triangularity of 0.15, and finally an up-down asymmetry corresponding to a single-null diverted geometry. This gives the opportunity to study separately the effect of each main characteristics of the equilibrium on microinstabilities in core plasmas. Linear local electrostatic gyrokinetic simulations of these different numerical equilibria and of their corresponding analytical descriptions (Miller-type representations [3]) are performed using the codes GS2 [4, 5] and GYRO[6]. It is observed that each modification of the equilibrium has an influence on the results of gyrokinetic simulations. The effect of the alpha parameter can compensate the stabilizing effect of an increase in the elongation. A comparison between the up-down symmetric shaped equilibrium and its corresponding diverted configuration show a non negligible effect on the growth rate of ITG and TEM turbulence. The comparison between the local Miller model and using a full equilibrium shows that it is mainly the indirect change of elongation in the plasma core which influences the results. The global aim is to provide well defined benchmark cases including real geometry and kinetic electrons physics, since this is not analyzed by the cyclone case. In addition, the goal is to define a procedure for testing of local simulations inspired by experimental constraints and results.

  • Details
  • Metrics
Type
conference paper
DOI
10.1088/1742-6596/260/1/012006
Web of Science ID

WOS:000290156400006

Author(s)
Burckel, Alice  
•
Sauter, Olivier  orcid-logo
•
Angioni, Clemente  
•
Candy, J.
•
Fable, Emiliano  
•
Lapillonne, Xavier
Date Issued

2010

Publisher

Iop Publishing Ltd, Dirac House, Temple Back, Bristol Bs1 6Be, England

Journal
Journal of Physics: Conference Series
Series title/Series vol.

Journal of Physics Conference Series

Volume

260

Issue

1

Subjects

Discharges

•

Turbulence

Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
CRPP  
SPC  
Event nameEvent placeEvent date
Theory of Fusion Pasmas: Joint Varenna-Lausanne Int. Workshop

Varenna, I

August, 2010

Available on Infoscience
May 10, 2011
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/67188
Logo EPFL, École polytechnique fédérale de Lausanne
  • Contact
  • infoscience@epfl.ch

  • Follow us on Facebook
  • Follow us on Instagram
  • Follow us on LinkedIn
  • Follow us on X
  • Follow us on Youtube
AccessibilityLegal noticePrivacy policyCookie settingsEnd User AgreementGet helpFeedback

Infoscience is a service managed and provided by the Library and IT Services of EPFL. © EPFL, tous droits réservés