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Large size hydrogen neutral beam injectors (NBI) used a negative ion source (NNBI)as well as a proton source (PNBI) were developed for the large helical device (LHD). The injectedpower from NNBI and PNBI have reached 16 MW and 6.8 MW, respectively. These injectedpowers have outstripped the nominal beam powers. A diagnostic system of beam-emitted hydrogenvisible spectrum has been installed along the beam injection axis to estimate the energy fractionon PNBI. The full energy beam component is about half which is equivalent to 70% of injectedbeam power. The attenuation of high energy neutral beam is also observed on NNBI. The peakdensity distribution is effective to increase beam deposition power.
Large size hydrogen neutral beam injectors (NBI) used a negative ion source (NNBI) as well as a proton source (PNBI) were developed for the large helical device (LHD). The injected power from NNBI and PNBI have reached 16 MW and 6.8 MW , respectively. These injected power have outstripped the nominal beam powers. A diagnostic system of beam-emitted hydrogenvisible spectrum has been installed along the beam injection axis to estimate the energy fraction of PNBI. The full energy beam component is about half which is equivalent to 70% of injected beam power. The attenuation of high energy neutral beam is also observed on NNBI. The peak intensity distribution is effective to increase beam deposition power.