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Interchange turbulence in 2-dimensions is investigated in the scrape-off layer (SOL) of fusion devices, when driven by a constant core particle influx. Contrary to the standard gradient driven approach, density is allowed to fluctuate around its average profile. Transverse transport exhibits some of the features of self-organized critical (SOC) systems, namely inward and outward avalanches, together with a frequency spectrum decrease in 1/f and f{-2} at intermediate and high frequencies respectively. An analytical expression of the SOL width Delta(SOL) is obtained, which maximizes the linear growth rate, when the poloidal modulation of electric potential equilibrium is taken into account.

Additional information

Authors: SARAZIN Y, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR);GHENDRIH P, CEA, CEN Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: Report: EUR-CEA-FC-1636 EN (1998) 40pp.
Availability: Available from Association Euratom-CEA, CEN Cadarache, 13108 Saint-Paul-lez-Durance (FR)
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