Abstract
Since the 2016 IAEA Fusion Energy Conference, FTU operations have been mainly devoted to experiments on runaway electrons and investigations into a tin liquid limiter; other experiments have involved studies of elongated plasmas and dust. The tearing mode onset in the high density regime has been studied by means of the linear resistive code MARS, and the highly collisional regimes have been investigated. New diagnostics, such as a runaway electron imaging spectroscopy system for in-flight runaway studies and a triple Cherenkov probe for the measurement of escaping electrons, have been successfully installed and tested, and new capabilities of the collective Thomson scattering and the laser induced breakdown spectroscopy diagnostics have been explored.
Highlights
IntroductionFTU is a compact high magnetic field machine (toroidal magn etic field BT up to 8 T, plasma current Ip up to 1.6 MA) with circular poloidal cross-section (major radius R0 = 0.935 m, minor radius a = 0.30 m) and metallic first wall
FTU is a compact high magnetic field machine with circular poloidal cross-section and metallic first wall
Plasmas of particular interest in terms of density peaking are observed. Another interesting effect is associated with the neon injection [32]: keeping the same collisionality, an impressive increase of the density peaking is obtained for doped pulses with respect to the un-doped ones
Summary
FTU is a compact high magnetic field machine (toroidal magn etic field BT up to 8 T, plasma current Ip up to 1.6 MA) with circular poloidal cross-section (major radius R0 = 0.935 m, minor radius a = 0.30 m) and metallic first wall. The stainless steel vacuum chamber has a thickness of 2 mm and is covered internally, at the high field side, by a toroidal limiter made of 2 cm thick molybdenum tiles, and a molybdenum poloidal limiter is present at the low field side. Since the 2016 IAEA Fusion Energy Conference in Kyoto, FTU operations were largely devoted to experiments on runaway electrons (REs) and liquid metal limiters. Other experiments have involved elongated plasmas, dust studies, the tearing mode (TM) onset in the high density regime and the highly collisional regimes. New diagnostics have been successfully installed and tested, and new capabilities of previously installed diagnostics have been explored
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