Role of avalanche transport in competing drift wave and interchange turbulence

Abstract We complete the 2D 2-fields turbulence model previously used with an interchange-like instability by slightly modifying parallel loss terms to drive drift wave instabilities. show that driven temperature fluctuations of sheath losses is identical turbulence. The linear analysis performed and select control parameters yield maximum growth rates for interchange alone instability. Combining two instabilities doubles rate. non-linear simulations are analyse SOL width. allow one identify a low field side region where unstable high only unstable. profiles appear exponential in close source but depart from simple fall-off far SOL. width found be larger case, smaller when both present finally narrower waves. For SOL, without interchange, observed on than at play. Sherwood dimensionless parameter, ratio convective particle flux divided diffusive flux, compare efficiency turbulent transport. parameter time surface averaged transport indicate dominant separatrix less effective towards evolution, determined flux-surface transport, indicates outward avalanche corrugations governs case only. When combining instabilities, pronounced inward observed, reducing overall efficiency. waves compared inhibited.