SOL and Divertor Fluctuations and Transport During Detachment

Turbulence in the DIII-D divertor and main chamber is characterized in attached and detached L and H-mode discharge conditions revealing the impact of distinct physics on each of particle and energy transport. Plasma density is increased in successive repeat discharges until T$_{\mathrm{e}}$ at the divertor plate is \textasciitilde 2-5 eV. As T$_{\mathrm{e}}$ drops at the plate, the heat flux profile width, measured by IRTV, varies little while the particle flux profile, measured with probes as , narrows by a factor of 2 until detachment. Density fluctuations increase 50-100{\%} as density increases towards detachment, but relative fluctuation levels, actually drop by 10X. However, for a given density, near-plate fluctuation levels always increase with divertor T$_{\mathrm{e}}$, suggesting that heat is the free energy source feeding the fluctuations.