Method and device for enhancing magnetic disturbance based on gas injection to inhibit escape current

Abstract

The invention discloses a method and device for enhancing magnetic disturbance based on gas injection to inhibit an escape current. The method comprises the steps: mounting a gas injection device on aTokamak vacuum chamber; loading gas to be injected into the gas injection device in advance; connecting a trigger control end of a switching valve of the gas injection device to a Tokamak central control system; when a plasma stably operates, controlling the Tokamak central control system not to trigger the switching valve and the gas injection device not to be started; and when the plasma is tobe disrupted, controlling the Tokamak central control system to trigger the switching valve to start the gas injection device, and making the gas injection device inject a gas into the plasma. The gasinjection device comprises a gas storage part, the switching valve and an injection nozzle. According to the method, the gas is injected into the plasma when the plasma is to be disrupted, and the gas entering the plasma disturbs a local current of the plasma to result in magnetic field disturbance, so that the formation of the escape current is inhibited, and the damage of the escape current tothe device is avoided.

Description

technical field [0001] The invention belongs to the field of protection against magnetic confinement nuclear fusion plasma rupture, and in particular relates to a method and device for enhancing the magnetic field disturbance of tokamak plasma by gas injection, causing radial transport loss of runaway electrons, and suppressing the formation of escape current during rupture. Background technique [0002] The threat to the safe operation of the device caused by the rupture of the tokamak plasma is one of the key factors hindering the development of magnetic confinement fusion. The plasma current of the large-scale tokamak device reaches the order of megaamperes, the temperature of the plasma reaches 100 million degrees Celsius, and the internal energy and electromagnetic energy stored in the plasma reach the order of hundreds of megajoules. When the tokamak breaks up, the rapid decrease of the plasma current will cause the rapid increase of the electric field around the plasm...

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Problems solved by technology

Therefore, in experiments using RMP coils to apply magnetic disturbances to suppress escape currents on different tokamak devices, the experimental results obtained are quite different, and the formation of escape currents during rupture cannot be reliably suppressed.

[0004] In the future, when the plasma breaks up in a large-scale tokamak device, it is still uncertain whether the existing methods can be used to suppress the formation of escaped electrons and effectively alleviate the damage caused by the bombardment of high-energy escaped electrons.

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