Speaker
Description
In order to study the generation and extraction of negative ions for neutral beam injection application, a prototype RF-driven negative ion source and the corresponding test bed are under construction at Institute of Plasma Physics, Chinese Academy of Sciences (ASIPP). The target of the negative ion source is extracting a negative ion beam of 350 A/m$^{2}$ for 3600 s plasma duration and 100 s beam duration. According to the design parameters of test bed, the design of a long pulse diagnostic calorimeter for testing beam characteristics is put forward. The calorimeter adopts hexahedron block design (8 × 28 blocks) and the size of each block is 18 × 18 mm$^{2}$. In order to prolong the operation times, a tungsten plate (5 mm thickness) is fastened to the heat-loading surface of each block. The thermal performance of calorimeter is assessed using FEM for validating the feasibility of this design scheme. Mathematical simulation shows that the design can meet the requirement of beam diagnosis.
