H-1NF

The H-1NF (or H-1 Australian Plasma Fusion Research Facility) is a research institute of the H-1 heliac, a large stellerator device located in the ANU Research School of Physics and Engineering at Canberra, Australia. It was established when the H-1 heliac was promoted to a national facility in 1996, adopting H-1NF as its facility name ("H-1" from the stellerator and "NF" for National Facility).
H-1 heliac stellarator.
The "H-1" flexible Heliac is a three field-period helical axis stellarator. Optimisation of the H-1 power supplies for low current ripple allows precise control of the ratio of secondary (helical, vertical) coil to primary (poloidal, toroidal) coil currents, resulting in a finely tunable magnetic geometry. Slight variation in the current ratio between shots (plasma discharges) in a sequence corresponds to a high resolution parameter scan through magnetic configurations (i.e.: rotational transform profile, magnetic well). The programmable control system allows for repetition rates of around 30 shots per hour, limited by data acquisition time and magnet cooling time.