CONCEPT DEFINITION OF VACUUM-SYSTEM FOR LOOP OPERATION OF LARGE HELICAL DEVICE

As the Large Helical Device (LHD), which is under construction at the National institute for Fusion Science, is installed in a super conduct ing magnet as confinement magnetic field, it is capable of operating i n a steady state loop operation, if proper particle controls of both u pstream (plasma region) and downstream (exhaust, impurity removal, H-i sotope separation and refueling) are achieved. In the following, not o nly is the concept of the steady state loop operation described but al so several hardware developments to meet th is requirement are discuss ed. Copyright (C) 1996 Elsevier Science Ltd.