Commissioning Results of the KSTAR NBI System

Full text: The neutral beam injection (NBI) system is designed to provide the ion heating and current drive for the high performance operation and long pulse operation of the Korean Superconducting Tokamak Advanced Research (KSTAR). KSTAR NBI consists of two beam lines. Each beam line contains three ion sources of which one ion source has been designed to deliver more than 2.5 MW of neutral beam power with maximum 120-keV beam energy for deuterium beam. Consequently, the final goal of the KSTAR NBI system aims to inject more than 14 MW of deuterium beam power with the two beam lines. According to the planned NBI system, the first NBI system is to demonstrate the beam injection into the KSTAR tokamak plasma in 2010's KSTAR campaign including the system commissioning of each components and subsystems. The first ion source to be used for 2010's KSTAR campaign consists of the plasma generator, which was developed by Japan Atomic Energy Agency (JAEA) by means of KOJA fusion collaboration agreement and whose validation test was completed at Korea Atomic Energy Research Institute (KAERI), and the KAERI accelerator. The ion source is mounted on the beam line system and connected with the high voltage cables and filament and arc powering cables coming from the high voltage deck. This paper will present the overview of the KSTAR first beam line system and the results of the beam line commissioning and the first beam experimental results. Also, the future plan of the KSTAR NBI system development will be presented. (author)