ELM resolved measurement of fuel recycling on divertor targets in DIII-D

Simultaneous measurements of different atomic and molecular contributions are important for determining D recycling from plasma-facing components (PFCs). A splitted filtered imaging of visible-range molecular and atomic emission was applied for the first time for synchronous measurements of D$_\alpha$ (656 nm), D2 Fulcher-$\alpha$ band (600 nm), and CD (430 nm) emissions in the strike point region of the lower divertor in DIII-D. Framing rate up to 1 kHz was sufficient to resolve intra- and inter-ELM phases of H-mode discharges. Radial profiles of atomic (molecular) fluxes of recycled D were deduced using respective S(D)/XB rate coefficients. We present the results of particle flux measurements for a series of shots with varying densities (n/n$_{GW}$ = 0.5-0.8), which affected the degree of the divertor detachment and the balance between individual channels of D recycling from PFCs.