Modeling Snowflake Plasmas in RFX-mod2: A Test Bed for SOL and Edge Physics Characterization
Fusion Engineering and Design（2023）SCI 3区
Abstract
The definition of low-current snowflake plasma equilibria in RFX-mod2 experiment is carried out in terms of both plasma conditions and engineering requirements. The snowflake magnetic configuration is obtained by solving a least-squares curve fitting problem with properly defined linear contraints. Positive and negative triangularity snowflake equilibria are defined and compared with a standard single-null plasma. The magnetic field topology is characterized in terms of local magnetic shear and connection length revealing all the potential advantages of a wider low poloidal field region. The RFX-mod2 improved diagnostic system and its magnet flexibility would allow a detailed characterization of the scrape off layer and plasma edge physics in snowflake configurations.
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Key words
Tokamak,Snowflake divertor
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