Recent Progress of Neutral Beam Injector and Bearn Emission Diagnosis in LHD

作     者：Katsunori IKEDA Kenichi NAGAOKA Yasuhiko TAKEIRI Masaki OSAKABE Katsuyoshi TSUMORI Osamu KANEKO 无 

作者机构：National Institute for Fusion Science LHD Experimental Group 

出 版 物：《Plasma Science and Technology》 (等离子体科学和技术（英文版）)

年 卷 期：2009年第11卷第4期

页      面：452-455页

核心收录：

学科分类：08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 080402[工学-测试计量技术及仪器] 082701[工学-核能科学与工程] 0838[工学-公安技术] 0827[工学-核科学与技术] 

基　　金：the budget for NIFS08ULBB501 of Japan the JSPS-CAS Core-University program in the field of Plasma and Nuclear Fusion 

主　　题：NBI spectroscopy LHD 

摘      要：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 powers have outstripped the nominal beam powers. A diagnostic system of beam-emitted hydrogen visible spectrum has been installed along the beam injection axis to estimate the energy fraction on 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 density distribution is effective to increase beam deposition power.