Edge Stability and Pedestal Profile Sensitivity of Snowflake Diverted Equilibria in the TCV Tokamak
✍ Scribed by S. Yu. Medvedev; A. A. Ivanov; A. A. Martynov; Yu. Yu. Poshekhonov; R. Behn; Y. R. Martin; J.-M. Moret; F. Piras; A. Pitzschke; A. Pochelon; O. Sauter; L. Villard
- Publisher
- John Wiley and Sons
- Year
- 2010
- Tongue
- English
- Weight
- 206 KB
- Volume
- 50
- Category
- Article
- ISSN
- 0005-8025
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✦ Synopsis
Abstract
A second order null divertor (snowflake) has been successfully created and controlled in the TCV tokamak [1] (F. Piras et al., Plasma Phys. Control. Fusion, 2009). The results of ideal MHD edge stability computations show an enhancement of the edge stability properties of the snowflake equilibria compared to standard x‐point configurations [2] (S. Yu. Medvedev et al., 36th EPS Conference on Plasma Physics, 2009). However, a sensitivity study of the stability limits to variations of the pedestal profiles is essential for making conclusions about possibilities of ELM control in snowflake plasmas. Variations of the edge stability and beta limits for several types of snowflake equilibria, different values of triangularity and various pedestal profiles are investigated (© 2010 WILEY‐VCH Verlag GmbH & Co. KGaA, Weinheim)