Intermittent turbulence in mixed-ion plasmas in LAPD

Intermittent turbulence is observed in the edge region of a wide range of magnetic confinement devices. The intermittency is explained by the generation of field-aligned filamentary structures, called "blobs," within the turbulent edge region. These blobs are observed to propagate outward and are responsible for a large fraction of particle transport in the edge region of magnetic confinement devices. Experiments on the Large Plasma Device at UCLA have shown that blobs have a typical cross-field size scale of $\sim 10 \rho_s$ and a typical cross-field velocity of $\sim C_s/10$\footnote{T.A. Carter, PoP 13, 010701 (2006)}. Recent experiments have focused on the properties of blobs in mixed-ion plasmas, in particular D-H plasmas with varying concentration. Such data is relevant to fusion plasmas which will ultimately be mixes of D and T. Results on the scaling of blob size, velocity, transport and other statistics (waiting time) with ion mix will be presented.