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Contribution Poster

H– and D– sources for fusion, accelerators and other applications

Initial results of optical emission spectroscopy based on a collisional radiative modeling in the RF hydrogen negative ion source in NFRI


  • Dr. Byungkeun NA

Primary authors



A prototype radio frequency (RF) negative hydrogen ion source is under developing under the cooperative research project between the National Fusion Research Institute (NFRI)and the Korea Atomic Energy Research Institute (KAERI). An inductively coupled plasma (ICP) of 2 MHz radio frequency is developed so far, and three grids accelerator and Cesium injector will be developed in the near future. For the plasma diagnostics system, optical emission spectroscopy (OES) based on a collisional-radiative (CR) modelling is on preparation with the 3-lens fiber collector and a spectrometer. The advantages of CR-OES are as followings: 1. It is a non-invasive method that is usable even in the high power experimental condition. 2. It provides plasma parameters as well as the densities of ion species. As a first stage of the diagnostics setup, the results from the CR-OES will be compared to the RF compensated Langmuir probe measurement. The application of the method to the neutral beam injector in Korea Superconducting Tokamak Advanced Research (KSTAR), a positive ion source based on arc discharge, and its result will be introduced as well.