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This paper describes the detailed design of the quench protection circuits (QPCs) for the superconducting toroidal field (TF) and poloidal field (PF) magnets of the satellite tokamak JT-60SA, which will be installed in Naka, Japan. The nominal currents to be interrupted and the maximum reapplied voltages are 25.7 kA and 2.8 kV for the TF QPCs and 20 kA and 5 kV for the PF QPCs. The innovative solution proposed in the QPC design is based on a hybrid circuit breaker (CB) composed of a mechanical bypass switch for conducting the continuous current, in parallel to a static CB for current interruption. The main choices of the final design are presented and discussed, either to confirm or to update and complete the study performed at the conceptual design level. [ABSTRACT FROM PUBLISHER]

This paper describes a device capable of throwing aluminum rings in a range of a few meters. The device is a modification of the jumping-ring design invented by the American engineer and inventor E. Thomson to demonstrate his pioneering research in alternating current. We improved the magnetic circuit of this device and created a new induction coilgun based on “E-shaped” design. We experimented with this new design under laboratory conditions and simulated its behavior using an interactive software package. Finally, we concluded that this device is able to achieve a higher speed than the Thomson design with lesser power consumption. [ABSTRACT FROM AUTHOR]