Measurement component design and manufacture for LHCD PAM antenna at low RF power on HL-2A

A LHCD system was developed on HL-2A, containing a Passive-Active Multijunction (PAM) antenna. The antenna was tested via the measurement components specially designed before it was installed on HL-2A. This paper mainly introduces the components design and the test result. The components contain two parts. One is connecting waveguide, which was designed for connecting the grills to the coaxial-to-waveguide converter with low RF loss. The other is sheet match load, filled in the grills and matching well. The connector was designed with the software of finite element analysis then manufactured after parameter optimization and machine design. The sheet match loads were also manufactured and adjusted for good match. Using the components, the RF characteristic of the antenna was measured in low power level, with the help of a VNA and two coaxial-to-waveguide converters. The results matched the design well. This conclusion then was verified in the next high power injection experiments such as the coupling optimization, the H-mode relevant experiments and the current drive experiments. (authors)