Performance of the LH antenna with carbon grill in JT-60U

After construction of the newly developed LH antenna, conditioning of the LH antenna has favorably been done with and without plasmas. RF energy of ∼5 MJ, so far, has been successfully injected into plasma. Good coupling property was obtained and sufficient plasma current was driven by LH injection of ∼1 MW. Therefore it is concluded that the application of carbon grill to the LH antenna has been successful.