Cross section drawing of MGI valve, the body is made of stainless steel, the mushroom piston is made of aluminum, and all the sealing between each component is viton O-ring (black ellipsoid).
Schematic diagram of MGI power supply, C and R C are the capacitance (1 mF) and resistance of the capacitor of the power supply; L and R L are the inductance and resistance of MGI coil, the values depend on the frequency of current; R adjust is the adjustable resistor to match the whole circuit to critical damping.
MGI current and voltage evolution during opening MGI valve.
Calibration result of MGI valve, the injection pressure is 39.7 bar, and the closure pressure is 15.4 bar.
Time evolution of MGI disruption, (a) plasma current in kA, (b) core electron temperature at 1.8 m in keV, (c) edge electron temperature at 2.2 m in keV, (d) loop voltage in V.
Plasma current decay of three MGI disruption shots, the MGI amounts are: 7.9 × 1021 D in shot #6100, 1.0 × 1022 D in shot #6392, and 6.1 × 1022 D in shot #6357.
D α emission (a.u.) during MGI disruption, (a)–(c) shows three shots with the increasing MGI amount, corresponding to Fig. 6, dashed line represents the rough center of plasma.
Plasma parameters during plasma breakdown of MGI shot #6204 and consecutive shot #6205, (a) plasma current in kA, (b) loop voltage in V, and (c) Da emission.
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