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First results on disruption mitigation by massive gas injection in Korea Superconducting Tokamak Advanced Research
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View: Figures


Image of FIG. 1.
FIG. 1.

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).

Image of FIG. 2.
FIG. 2.

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.

Image of FIG. 3.
FIG. 3.

MGI current and voltage evolution during opening MGI valve.

Image of FIG. 4.
FIG. 4.

Calibration result of MGI valve, the injection pressure is 39.7 bar, and the closure pressure is 15.4 bar.

Image of FIG. 5.
FIG. 5.

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.

Image of FIG. 6.
FIG. 6.

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.

Image of FIG. 7.
FIG. 7.

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.

Image of FIG. 8.
FIG. 8.

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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752b84549af89a08dbdd7fdb8b9568b5 journal.articlezxybnytfddd
Scitation: First results on disruption mitigation by massive gas injection in Korea Superconducting Tokamak Advanced Research