Analysis of shine-through of EAST neutral beam

High-energy neutral beam injection(NBI) is one of the four Tokamak auxiliary heating methods(The four methods are the neutral beam injection, lower hybrid, ion cyclotron waves paragraph, and the section electron cyclotron waves). Due to the highest heating efficiency, and the clearly physical mechanism, NBI is regarded as the most effective heating method by international fusion community. In order to explore shine through of EAST（Experimental Advanced Superconducting Tokamak）-NBI, specific hardware circuit block diagram and experimental scheme are designed based on the theoretical analysis of the principle of shine through, and the correctness of the theoretical deduction is verified by experiments. The method of quantitative calibration of the thermocouple in the center point of the ion source beam spot is the standard for the calculation of the shine-through. The value of shine-through is calculated by the ratio of the armor tile thermocouple unit energy of temperature rise to that of calibrated one. The experimental results show that, in a certain range, the shine through increases linearly with the increase of the injection beam energy, and decreases exponentially with the increase of the plasma density.