A diagnostic technique to study the global structure of the recycling and impurity (molybdenum) influx from the plasma facing components is proposed and is tested using the three kinds of perturbations (gas puffing, transport oscillation, and localized heat deposition). Balmer line intensities IHα, charge exchange flux ΓCX and neutral molybdenum line IMoI are measured and their correlations are analyzed with response to the perturbation parameters (IHα at the gas port, density ne, and hot spot temperature Thot). A simple model calculation is done to understand these correlations. It is found that the phase reversal of ΓCX with respect to ne modulation is well reproduced and a critical density exists for the phase reversal of IMoI. The evaporation Mo flux evaluated with measured Thot is also compared with enhanced IMoI for the heat load perturbation and it contribution to the total content of Mo ions is evaluated by ∼30% increment.
All Science Journal Classification (ASJC) codes
- Nuclear and High Energy Physics
- Materials Science(all)
- Nuclear Energy and Engineering