Abstract
AbstractA comprehensive set of experiments has been carried out on the DIII‐D tokamak to measure the 2‐D (R,Z) structure of the divertor plasma in a systematic way using new diagnostics. Measurements cover the divertor radially from inside the X–‐point to the outer target plate and vertically from the target plate to above the X–‐point. Identical, repeatable shots were made, each having radial sweeps of the X–‐point and divertor strike points, to allow complete plasma and radiation profile measurements. Data have been obtained in ohmic, L–‐mode, ELMing H–‐mode, and reversed BToperation (ΔB drift away from the X–‐point). In addition, complete measurements were made of radiative divertor plasmas with a Partially Detached Divertor (PDD) induced by D2 injection and with a Radiating Mantle induced by Impurity injection (MI) using neon and nitrogen. The data set includes first observations of the radial and poloidal profiles of the X‐point, inner and outer leg plasmas in PDD and RMI radiative divertor operation. Preliminary data analysis shows that intrinsic impurities play a critical role in determining the SOL and divertor conditions.
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