Theoretical analysis of long range turbulent transport in the Scrape-Off-Layer
2D fluid simulations of Scrape-Off Layer (SOL) turbulence with non-constrained energy content (flux driven) are characterized by profile relaxation and strong outward bursts of density. The ballistic propagation extends well beyond the e-folding length of the SOL with a Mach number of M (perpendicular) difference 0.04. Turbulence stabilisation is achieved by biasing part of the limiter surface. The critical radial extent to achieve this stabilisation is derived. This effect governs the size of the biased ring required to insulate the wall from the long bursts of matter. The same characteristic scale also governs the critical size of the Langmuir probe tips. For probe tips in excess of this size, the flux tube to the probe was found to be decoupled from the background plasma.
Bibliographic Reference: CEA Cadarache, report n° EUR-CEA-FC-1729, December 2002. pp.19.
Availability: Available from Association EURATOM-CEA, Département de Recherches sur la Fusion Contrôlée, CEA Cadarache, F-13108 St Paul-Lez-Durance, France Tel: (+33) 4 42 25 70 01; Fax: (+33) 4 42 25 64 21 E-mail: email@example.com
Record Number: 200315853 / Last updated on: 2003-01-31
Original language: en
Available languages: en