Long Pulse Discharge of MW-ICRF Heated Plasma on the Large Helical Device

Achieving a long pulse plasma discharge is one of the main purposes of experiments on the Large Helical Device, (LHD) and attempts have been carried out in every experimental campaign. A long pulse plasma discharge of 1905 sec (with a total input energy of the plasma heating exceeding 1.3J) was achieved at less than 1MW in the 8th experimental campaign, i.e.