Engineering design and fabrication of the new-type antenna for EAST

One new-type of the antenna named Radiation stripline antenna (RSA) is designed to verify the design principles of that proposed for EAST, in relevant plasma conditions. It is expected to launch 1.5 MW of RF power to the plasma of the EAST machine during operation. RSA antenna is a new type of EAST antenna with heating frequency ranging from 27MHz~75MHz, one insulation layer with high-voltage resistance (30Kv) is designed to make current strap totally insulate from ground. The antenna mainly consists of faraday shield, four toroidal current straps, antenna frame, vacuum transmission line and vacuum feedthrough. Faraday shield subdivided four sections of screen, antenna frame is connected by six rods supporting the antenna weight, the rods can be moved along the radial direction by the rear driver system. During design of antenna, some analysis using finite element method (FEM) and high frequency structure simulation (HFSS) have been carried out for the RSA components, results promise that RSA antenna satisfies what are expected during antenna system operation. some In addition, a prototype RSA antenna have been fabricated and will be put into test for the long pulse, high power of EAST incoming operation.