Journal
NUCLEAR FUSION
Volume 59, Issue 1, Pages -Publisher
IOP PUBLISHING LTD
DOI: 10.1088/1741-4326/aaf034
Keywords
stellarators; turbulent transport processes; electrode biasing technique; turbulence spreading
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Funding
- Ministerio de Economia y Competitividad of Spain [ENE2015-68206-P]
- Euratom research and training programme [633053]
- Erasmus Mundus International Doctoral College in Fusion Science and Engineering (FUSION-DC)
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In this paper, we report measurements of turbulence drive and spreading in the edge region and scrape-off layer (SOL) of the TJ-II stellarator for plasmas heated by ECRH and NBI. In addition, we show how these and various other relevant quantities can be modulated actively via edge biasing, i.e. by establishing an edge flow shear layer. When the edge E x B shear reaches values close to the inverse of the turbulence correlation time, turbulence spreading and edge-SOL coupling are reduced significantly. The resulting control of SOL spreading via the edge E x B shear is important in view of the issue of understanding and controlling the SOL width in fusion-relevant devices.
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