Abstract
High power negative-ion-based neutral beam injectors for the LHD were constructed and started in operation in September 1998. Two beam lines with a pair of ion sources are installed tangentially in opposing direction. The maximum energy of the beam is 180 keV for hydrogen, and the total injection power is designed to be 15 MW with the pulse length of 10 seconds. One of the specific features of the negative-ion-based NBI system is the requirement on the vacuum pressure in order to avoid the stripping loss of negative ions as well as to realize the optimum gas line density for neutralization, which results in the long beam line. The system was then designed carefully by considering the focal length of the ion sources, neutralizing efficiency, and geometrical and re-ionizing loss of the beam. It is also considered the error magnetic field produced by the ferromagnetic materials that are indispensable for NBI for the magnetic shield over the long neutralizing region.
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