Measurement and verification of Z_eff radial profiles using charge exchange recombination spectroscopy on DⅢ-D

摘要

Charge exchange recombination(CER)spectroscopy in the visible spectrum is used to measure the radial ion density distribution of impurities in the core plasma of DⅢ-D. The radial profile of the effective ionic charge, Z_eff(r), is subsequently calculated from the impurity densities and the electron density of the plasma. The CER measured radial distribution rely on a calculated neutral beam attenuation radial profile, which is confirmed by independent measurement. This technique, which determines the deuterium density of the neutral beam by coupling measured beam D_αemissions with a time dependent collisional radiative calculation, will be described.