A plasma density limit rupture warning and mitigation system

Abstract

The present invention belongs to the field of nuclear science and technology, specifically to a plasma density limit disruption warning and mitigation system. The system comprises: a plasma, a disturbance quantity measurement and diagnostic system, a balance quantity measurement and diagnostic system, a spectrum analyzer, a general fishbone mode dispersion relation solver, a central processing unit, a gas supply control system, a tokamak gas supply system, an electron cyclotron heating control system, an electron cyclotron, a radio frequency antenna, and a warning light. The system addresses the experimental phenomenon of plasma disruption that is prone to occur during high electron density operation in magnetic confinement fusion devices. By measuring the dynamic spherical ball model excited under high-density conditions as a warning signal, the system mitigates density limit disruption by reducing the electron density or controlling the dynamic spherical ball model through external means such as the gas supply system and the electron cyclotron heating system.

Description

Technical Field

[0001] The present invention belongs to the field of nuclear science and technology, and in particular relates to a plasma density limit rupture early warning and mitigation system. Background Art

[0002] Nuclear fusion energy is a safe and pollution-free future energy source, and the Tokamak is considered the most likely way to achieve magnetic confinement nuclear fusion. The most concerned parameters in the field of magnetic confinement nuclear fusion are the electron density n, the ion temperature T i and energy confinement time τ E , because whether fusion can be ignited depends on whether the product of these three basic parameters exceeds a certain threshold, that is, whether it satisfies the famous Lawson criterion. For deuterium-tritium fusion, nT is required. i τ E >3×10 21 keVm -3 s. Meanwhile, experimental research has shown that fusion power is proportional to the square of the number of electrons. It's easy to see that the higher the electron density, the easier it is to meet fusion ignition conditions, and the higher the fusion power produced. Therefore, high electron density operation has become a necessary option for existing and future fusion devices.

[0003] However, a large amount of experimental evidence shows that the operation of the tokamak device is affected by the Greenwald density n GW (10 20 m -3 )=I p (MA) / πa 2 (m 2 ) limit, when the Greenwald fraction n / n GW When a certain threshold is exceeded, the plasma will break, which is the so-called density limit break. p is the plasma current, and a is the tokamak's minimum radius. Possible factors causing the density limit to break are boundary cooling and boundary radiation enhancement, but these two possible physical mechanisms cannot explain all experimental phenomena.

[0004] Furthermore, the myriad factors that contribute to boundary cooling and enhanced edge radiation have prevented scientists from finding reliable early warning indicators for density limit disruption. Consequently, no magnetic confinement fusion device worldwide has successfully predicted electron density limit disruption, a significant detriment to the safe operation of future fusion reactors.

[0005] In the last round of HL-2A experiments, we discovered for the first time that the breaking of the plasma electron density limit is always accompanied by a large number of dynamic balloon modes (such as the attached Figure 2 These modes are mainly caused by the pressure P = Kn (T i +T e), where K is the Kelvin constant, T e is the electron temperature. Generally speaking, the greater the temperature or density, the greater the gradient and the pressure gradient. Experimental evidence shows that when the Greenwald fraction n / n GW When a certain threshold is exceeded, the kinetic ballooning mode is excited and then gradually sweeps downward with the change of the safety factor. When a low-mode kinetic ballooning mode appears, the plasma ruptures. At this time, due to the escape of a large number of particles from the confinement region, the electron density drops rapidly. We have observed similar phenomena in multiple electron density ramp-up experiments, which means that kinetic ballooning modes are ubiquitous in high-density plasmas. Because the mode structures of multi-mode kinetic ballooning modes overlap in space, these modes may enhance particle and energy transport, and at the same time, it means that the coexistence of multiple kinetic ballooning modes is likely an important reason for inducing the plasma density limit rupture. To avoid the occurrence of density limit rupture, on the one hand, the electron density can be directly reduced, and on the other hand, the probability of kinetic ballooning modes rupturing with less density limit can be controlled.

[0006] Therefore, based on the physical experiments of the HL-2A device, the present invention proposes a plasma electron density limit rupture warning and mitigation system that uses a dynamic physical balloon model as a warning signal and uses electron cyclotron waves and a gas supply system as mitigation measures. Summary of the Invention

[0007] The purpose of the present invention is to provide a plasma density limit rupture warning and mitigation system. The system targets the experimental phenomenon that plasma rupture is easily generated when a magnetic confinement fusion device is operating at high electron density. By measuring the dynamic spherical ball model excited under high-density conditions as a warning signal, the system reduces the electron density or controls the dynamic spherical ball model through external means such as a gas supply system and an electron cyclotron heating system, thereby achieving mitigation of limit rupture.

[0008] The technical solution for achieving the purpose of the present invention is as follows:

[0009] A plasma density limit rupture early warning and mitigation system, comprising: plasma, a disturbance quantity measurement and diagnosis system, a balance quantity measurement and diagnosis system, a spectrum analyzer, a general fishbone mode dispersion relation solver, a central processing unit, a gas supply control system, and a tokamak gas supply system; the plasma is directly connected to the measurement end of the disturbance quantity diagnosis system, the output end of the disturbance quantity diagnosis system is connected to the input end of the spectrum analyzer, and the output end of the spectrum analyzer is connected to the input end c of the central processing unit; the plasma is directly connected to the measurement end of the balance quantity diagnosis system, the output end a of the balance quantity diagnosis system is connected to the input end of the general fishbone mode dispersion relation solver, and the output end of the general fishbone mode dispersion relation solver is connected to the input end a of the central processing unit; the output end e of the central processing unit is connected to the gas supply control system, and the gas supply system is connected to the central processing unit. The control system is connected to the tokamak gas supply system, and the tokamak gas supply system is connected to the plasma; the equilibrium quantity measurement and diagnosis system and the disturbance quantity measurement and diagnosis system respectively measure the plasma equilibrium parameters and electromagnetic fluctuation information from the plasma, and input the data into the general fishbone mode dispersion relation solver and the spectrum analyzer, and then the general fishbone mode dispersion relation solver and the spectrum analyzer transmit the dynamic spherical ball mode frequencies calculated by each of them to the central processing unit; the central processing unit compares the frequencies calculated by the general fishbone mode dispersion relation solver and the spectrum analyzer respectively, calculates the electron density Green's fraction, and sends operation instructions to the tokamak gas supply system based on the comparison result of the calculated electron density Green's fraction with the set threshold; after receiving the instructions, the gas supply control system controls the switch and gas supply volume of the tokamak gas supply system.

[0010] The early warning and mitigation system also includes: an electron cyclotron heating control system, an electron cyclotron and a radio frequency wave antenna. The output terminal f of the central processing unit is connected to the electron cyclotron heating control system, the electron cyclotron heating control system is connected to the electron cyclotron, the electron cyclotron is connected to the radio frequency wave antenna, and the radio frequency wave antenna is connected to the plasma. The electron cyclotron heating control system receives operation instructions sent by the central processing unit, and after receiving the instructions, the electron cyclotron heating control system controls the switching state and output power of the electron cyclotron.

[0011] A plasma density limit rupture early warning and mitigation system, comprising: plasma, a disturbance quantity measurement and diagnosis system, a balance quantity measurement and diagnosis system, a spectrum analyzer, a general fishbone mode dispersion relation solver, a central processing unit, an electron cyclotron heating control system, an electron cyclotron, and a radio frequency wave antenna; the plasma is directly connected to the measurement end of the disturbance quantity diagnosis system, the output end of the disturbance quantity diagnosis system is connected to the input end of the spectrum analyzer, and the output end of the spectrum analyzer is connected to the input end c of the central processing unit; the plasma is directly connected to the measurement end of the balance quantity diagnosis system, the output end a of the balance quantity diagnosis system is connected to the input end of the general fishbone mode dispersion relation solver, and the output end of the general fishbone mode dispersion relation solver is connected to the input end a of the central processing unit; the output end f of the central processing unit is connected to the electron cyclotron heating control system, and the electron cyclotron heating control system is connected to the input end of the central processing unit. The control system is connected to the electron gyrotron, the electron gyrotron is connected to the radio frequency wave antenna, and the radio frequency wave antenna is connected to the plasma; the balance quantity measurement and diagnosis system and the disturbance quantity measurement and diagnosis system respectively measure the plasma balance parameters and the dynamic sphere mode frequency from the plasma, and input the data into the general fishbone mode dispersion relation solver and the spectrum analyzer, and then the general fishbone mode dispersion relation solver and the spectrum analyzer transmit the dynamic sphere mode frequencies calculated by each to the central processing unit; the central processing unit compares the frequencies calculated by the general fishbone mode dispersion relation solver and the spectrum analyzer respectively, calculates the electron density Green's fraction, and sends an operation instruction to the electron cyclotron heating control system based on the comparison result of the calculated electron density Green's fraction with the set threshold; after receiving the instruction, the electron cyclotron heating control system controls the switching state and output power of the electron cyclotron.

[0012] The output terminal b of the balance quantity diagnostic system is directly connected to the input terminal b of the central processing unit; when the frequency calculated by the general fishbone mode dispersion relation solver is consistent with the frequency calculated by the spectrum analyzer, the central processing unit calculates the electron density Green's fraction based on the parameters input by the balance quantity measurement diagnostic system.

[0013] The early warning and mitigation system further includes: a warning light, the output terminal g of the central processing unit is connected to the warning light, the warning light receives an operation instruction sent by the central processing unit, and the warning light starts to flash after receiving the instruction.

[0014] The balance quantity measurement and diagnosis system includes a laser interferometer, a Thomson scattering system, a charge exchange spectrometer, a magnetic probe and a dynamic Stark effect spectrometer. The laser interferometer is used to measure the electron density distribution and the average density of the electron line; the Thomson scattering system is used to measure the electron density; the charge exchange spectrometer is used to measure the ion temperature; the magnetic probe is used to measure the plasma current; and the dynamic Stark effect spectrometer is used to measure the safety factor.

[0015] The disturbance measurement and diagnosis system comprises a microwave interferometer and a microwave reflectometer, which are used to measure the frequency and spatial position information of the dynamic spherical ball model.

[0016] The general fishbone mode dispersion relation solver is used to analyze the general fishbone mode dispersion relation. The input data are the electron density distribution, electron temperature, ion temperature, plasma current and safety factor output by the balance quantity measurement and diagnosis system; the output data are the frequency and growth rate of the dynamic ballistic mode.

[0017] The spectrum analyzer is used to analyze the data output by the disturbance measurement system, perform frequency identification through Fourier analysis, and the output data is the dynamic ball mode frequency.

[0018] The beneficial technical effects of the present invention are:

[0019] 1. This patent proposes for the first time a warning reference for the plasma density rupture limit and provides possible mitigation methods for density limit rupture, which is beneficial to avoid and control the occurrence of plasma rupture, thereby ensuring the safety and stability of the magnetic confinement fusion device.

[0020] 2. The physical balloon model of the early warning reference of the patent of the present invention can exist for a long time, which makes the patent of the invention have a relatively long early warning time (more than 40ms), which is conducive to improving the accuracy of the early warning.

[0021] 3. The patent of this invention confirms the basic characteristics of the dynamic balloon model through both experiments and theoretical calculations, which is conducive to increasing the effectiveness of early warning and reducing the error rate of the early warning system. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 A block diagram of a plasma density limit rupture warning and mitigation system provided by the present invention;

[0023] Figure 2 The kinetic ballooning mode discovered in the high-density experiment of the HL-2A device: (top) plasma current; (middle) Greenwald fraction, which is the ratio of the average electron line density to the Greenwald density; (bottom) kinetic ballooning mode measured by the microwave interferometer system, where each dark stripe in the spectrum represents a kinetic ballooning mode.

[0024] In the figure: 1-plasma; 2-balance quantity measurement and diagnosis system; 3-disturbance quantity measurement and diagnosis system; 4-general fishbone mode dispersion relation solver; 5-spectrum analyzer; 6-central processing unit; 7-gas supply control system; 8-tokamak gas supply system; 9-electron cyclotron heating control system; 10-electron cyclotron; 11-radio frequency wave antenna; 12-warning light. DETAILED DESCRIPTION

[0025] The present invention will be further described in detail below with reference to the accompanying drawings and embodiments.

[0026] like Figure 1 As shown, the present invention provides a plasma density limit rupture warning and mitigation system, comprising: plasma 1, a balance quantity measurement and diagnosis system 2, a disturbance quantity measurement and diagnosis system 3, a general fishbone mode dispersion relation solver 4, a spectrum analyzer 5, a central processing unit 6, a gas supply control system 7, a tokamak gas supply system 8, an electron cyclotron heating control system 9, an electron cyclotron 10, a radio frequency wave antenna 11, and a warning light 12. The plasma 1 is directly connected to the measuring end of the disturbance quantity diagnostic system 3, the output end of the disturbance quantity diagnostic system 3 is connected to the input end of the spectrum analyzer 5, and the output end of the spectrum analyzer 5 is connected to the input end c of the central processing unit 6; the plasma 1 is directly connected to the measuring end of the balance quantity diagnostic system 2, the output end a of the balance quantity diagnostic system 2 is connected to the input end of the general fishbone mode dispersion relation solver 4, the output end of the general fishbone mode dispersion relation solver 4 is connected to the input end a of the central processing unit 6, and in addition, the output end b of the balance quantity diagnostic system 2 is directly connected to the input end b of the central processing unit 6; the output end e of the central processing unit 6 is connected to the gas supply control system 7, the gas supply control system 7 is connected to the tokamak gas supply system 8, and the tokamak gas supply system 8 is connected to the plasma 1; the output end f of the central processing unit 6 is connected to the electron cyclotron heating control system 9, the electron cyclotron heating control system 9 is connected to the electron gyrotron 10, the electron gyrotron 10 is connected to the radio frequency wave antenna 11, and the radio frequency wave antenna 11 is connected to the plasma 1; the output end g of the central processing unit 6 is connected to the warning light 12.

[0027] A specific embodiment of a plasma density limit rupture warning and mitigation system is as follows: a balance quantity measurement and diagnostic system 2 and a disturbance quantity measurement and diagnostic system 3 respectively measure plasma equilibrium parameters and dynamic spherical ball model frequencies from a plasma 1, and input these data into a general fishbone mode dispersion relation solver 4 and a spectrum analyzer 5. The general fishbone mode dispersion relation solver 4 and the spectrum analyzer 5 then transmit the calculated dynamic spherical ball model frequencies to a central processing unit 6. The central processing unit 6 compares the frequencies. If the frequencies are substantially consistent, it immediately calculates the electron density Greenwald score based on the parameters input by the balance quantity measurement and diagnostic system 2. If the Greenwald score exceeds a set threshold, the central processing unit 6 simultaneously issues commands to the gas supply control system 7, the electron cyclotron heating control system 9, and the warning light 12. Upon receiving the commands, the gas supply control system 7 controls the on / off state and gas flow of the tokamak gas supply system 8. The electron cyclotron heating control system 9 controls the on / off state and output power of the electron gyrotron 10. The warning light 12 begins to flash upon receiving the commands. If the Greenwald score falls below the set threshold, the central processing unit 6 does not issue any further commands.

[0028] The plasma 1 refers to the high temperature plasma in the nuclear fusion device, which requires a high enough electron density level to excite the dynamic spherical model, such as Figure 2As shown in the figure, it's easy to see that the kinetic ballooning mode is only activated when the Green's fraction reaches 0.95, and this mode persists for more than 40ms before the density limit breaks down (at which point the electron density drops rapidly). The long-term existence of the kinetic ballooning mode provides the early warning system with sufficient time, which will enable the system to operate more accurately.

[0029] The equilibrium quantity measurement and diagnosis system 2 is primarily used to measure plasma equilibrium parameters (electron density distribution, average electron line density, electron temperature, ion temperature, plasma current, and safety factor), and includes, but is not limited to, a laser interferometer, a Thomson scattering system, a charge exchange spectrometer, a magnetic probe, and a dynamic Stark effect spectrometer. The laser interferometer is used to measure the electron density distribution and average electron line density; the Thomson scattering system is used to measure electron density; the charge exchange spectrometer is used to measure ion temperature; the magnetic probe is used to measure plasma current; and the dynamic Stark effect spectrometer is used to measure the safety factor.

[0030] The disturbance measurement and diagnosis system 3 mainly includes but is not limited to a microwave interferometer and a microwave reflectometer, which are used to measure the frequency and spatial position information of the dynamic spherical ball model.

[0031] The general fishbone mode dispersion relation solver 4 is mainly used to analyze the general fishbone mode dispersion relation. The main input data are the electron density distribution, electron temperature, ion temperature, plasma current and safety factor output by the balance quantity measurement and diagnosis system 2; the output data are the frequency and growth rate of the dynamic ballistic model.

[0032] The spectrum analyzer 5 is mainly used to analyze the data output by the disturbance measurement system 3. The main implementation method is to perform frequency identification through Fourier analysis, and the output data is the dynamic ball mode frequency.

[0033] The central processor 6 has three major functions: first, comparing the frequencies calculated by the general fishbone mode dispersion relation solver 4 and the spectrum analyzer 5; second, calculating the electron density Green's fraction; and third, sending operation instructions to the back-end system.

[0034] The gas supply control system 7 can receive instructions from the central processor 6 and control the switch and gas supply volume of the tokamak gas supply system 8.

[0035] The tokamak gas supply system 8 specifically executes the instructions of the gas supply control system 7, controls the gas supply volume through valves or even directly shuts it down.

[0036] The electronic cyclotron heating control system 9 can receive instructions from the central processor 6 and control information such as the power output, pulse duration, injection time, and injection position of the electronic cyclotron 10 .

[0037] The radio frequency antenna 11 primarily injects electron cyclotron waves into the plasma. These waves not only enhance particle transport, causing particle pumping and thus directly reducing electron density, but also weaken the drive of the dynamic spherical mode by altering the safety factor and magnetic shear, thereby avoiding the possibility of mode-induced density limit rupture. It is worth noting that the tokamak gas delivery system and the electron cyclotron system can operate simultaneously or independently.

[0038] The warning light 12 flashes only when the frequencies of the general fishbone mode dispersion relation solver 4 and the spectrum analyzer 5 are consistent and the instructions of the central processing unit 6 are received, otherwise it goes out.

[0039] The present invention has been described in detail above with reference to the accompanying drawings and embodiments. However, the present invention is not limited to the above embodiments. Various modifications can be made within the scope of knowledge possessed by those skilled in the art without departing from the spirit of the present invention. Any content not described in detail in the present invention may be adapted from existing technologies.

Claims

1. A plasma density limit rupture warning and mitigation system, characterized in that: The early warning and mitigation system comprises: a plasma (1), a balance quantity measurement and diagnosis system (2), a disturbance quantity measurement and diagnosis system (3), a general fishbone mode dispersion relation solver (4), a spectrum analyzer (5), a central processing unit (6), a gas supply control system (7) and a tokamak gas supply system (8); the plasma (1) is directly connected to the measurement end of the disturbance quantity diagnosis system (3), the output end of the disturbance quantity diagnosis system (3) is connected to the input end of the spectrum analyzer (5), and the output end of the spectrum analyzer (5) is connected to the input end c of the central processing unit (6); the plasma (1) is directly connected to the measurement end of the balance quantity diagnosis system (2), the output end a of the balance quantity diagnosis system (2) is connected to the input end of the general fishbone mode dispersion relation solver (4), and the output end of the general fishbone mode dispersion relation solver (4) is connected to the input end a of the central processing unit (6); the output end e of the central processing unit (6) is connected to the gas supply control system (7), and the gas supply control system (7) is connected to the tokamak gas supply system (8). The system (8) is connected, and the tokamak gas supply system (8) is connected to the plasma (1); the equilibrium quantity measurement and diagnosis system (2) and the disturbance quantity measurement and diagnosis system (3) respectively measure the plasma equilibrium parameters and electromagnetic fluctuation information from the plasma (1), and input the data into the general fishbone mode dispersion relation solver (4) and the spectrum analyzer (5), and then the general fishbone mode dispersion relation solver (4) and the spectrum analyzer (5) transmit the dynamic spherical ball mode frequency calculated by each to the central processing unit (6); the central processing unit (6) compares the frequencies calculated by the general fishbone mode dispersion relation solver (4) and the spectrum analyzer (5), and calculates the electron density Green's fraction using the data input by the equilibrium quantity measurement and diagnosis system (2), and sends an operation instruction to the tokamak gas supply system (8) according to the comparison result of the calculated electron density Green's fraction and the set threshold value; after receiving the instruction, the gas supply control system (7) controls the switch and gas supply volume of the tokamak gas supply system (8).

2. A plasma density limit rupture warning and mitigation system according to claim 1, characterized in that: The early warning and mitigation system further comprises: an electron cyclotron heating control system (9), an electron cyclotron (10) and a radio frequency wave antenna (11); an output terminal f of a central processing unit (6) is connected to the electron cyclotron heating control system (9), the electron cyclotron heating control system (9) is connected to the electron cyclotron (10), the electron cyclotron (10) is connected to the radio frequency wave antenna (11), and the radio frequency wave antenna (11) is connected to the plasma (1); the electron cyclotron heating control system (9) receives an operation instruction sent by the central processing unit (6), and after receiving the instruction, the electron cyclotron heating control system (9) controls the switching state and output power of the electron cyclotron (10).

3. A plasma density limit rupture warning and mitigation system, characterized in that: The early warning and mitigation system comprises: a plasma (1), a balance quantity measurement and diagnosis system (2), a disturbance quantity measurement and diagnosis system (3), a general fishbone mode dispersion relation solver (4), a spectrum analyzer (5), a central processing unit (6), an electron cyclotron heating control system (9), an electron cyclotron (10) and a radio frequency wave antenna (11); the plasma (1) is directly connected to the measurement end of the disturbance quantity diagnosis system (3), the output end of the disturbance quantity diagnosis system (3) is connected to the input end of the spectrum analyzer (5), and the output end of the spectrum analyzer (5) is connected to the input end c of the central processing unit (6); the plasma (1) is directly connected to the measurement end of the balance quantity diagnosis system (2), the output end a of the balance quantity diagnosis system (2) is connected to the input end of the general fishbone mode dispersion relation solver (4), and the output end of the general fishbone mode dispersion relation solver (4) is connected to the input end a of the central processing unit (6); the output end f of the central processing unit (6) is connected to the electron cyclotron heating control system (9), and the electron cyclotron heating control system (9) is connected to The electron gyrotron (10) is connected to the radio frequency wave antenna (11), and the radio frequency wave antenna (11) is connected to the plasma (1); the balance quantity measurement and diagnosis system (2) and the disturbance quantity measurement and diagnosis system (3) respectively measure the plasma balance parameters and electromagnetic fluctuation information from the plasma (1), and input the data into the general fishbone mode dispersion relation solver (4) and the spectrum analyzer (5), and then the general fishbone mode dispersion relation solver (4) and the spectrum analyzer (5) transmit the dynamic spherical mode frequency calculated by each to the central processing unit (6); the central processing unit (6) compares the frequencies calculated by the general fishbone mode dispersion relation solver (4) and the spectrum analyzer (5), calculates the electron density Green's fraction, and sends an operation instruction to the electron cyclotron heating control system (9) according to the comparison result of the calculated electron density Green's fraction and the set threshold value; after receiving the instruction, the electron cyclotron heating control system (9) controls the switching state and output power of the electron cyclotron (10).

4. A plasma density limit rupture warning and mitigation system according to any one of claims 1 to 3, characterized in that: The output terminal b of the balance quantity diagnostic system (2) is directly connected to the input terminal b of the central processing unit (6); when the frequency calculated by the general fishbone mode dispersion relation solver (4) is consistent with the frequency calculated by the spectrum analyzer (5), the central processing unit (6) calculates the electron density Green's fraction based on the parameters input by the balance quantity measurement diagnostic system (2).

5. A plasma density limit rupture warning and mitigation system according to any one of claims 1 to 3, characterized in that: The early warning and mitigation system further includes a warning light (12), wherein the output terminal g of the central processing unit (6) is connected to the warning light (12), and the warning light (12) receives an operation instruction sent by the central processing unit (6), and the warning light (12) starts flashing after receiving the instruction.

6. A plasma density limit rupture warning and mitigation system according to any one of claims 1 to 3, characterized in that: The balance quantity measurement and diagnosis system (2) includes a laser interferometer, a Thomson scattering system, a charge exchange spectrometer, a magnetic probe and a dynamic Stark effect spectrometer, wherein the laser interferometer is used to measure the electron density distribution and the average density of the electron line; the Thomson scattering system is used to measure the electron density; the charge exchange spectrometer is used to measure the ion temperature; the magnetic probe is used to measure the plasma current; and the dynamic Stark effect spectrometer is used to measure the safety factor.

7. A plasma density limit rupture warning and mitigation system according to any one of claims 1 to 3, characterized in that: The disturbance measurement and diagnosis system (3) includes a microwave interferometer and a microwave reflectometer, which are used to measure the frequency and spatial position information of the dynamic spherical ball model.

8. A plasma density limit rupture warning and mitigation system according to any one of claims 1 to 3, characterized in that: The general fishbone mode dispersion relation solver (4) is used to analyze the general fishbone mode dispersion relation, and the input data are the electron density distribution, electron temperature, ion temperature, plasma current and safety factor output by the balance quantity measurement and diagnosis system (2); the output data are the frequency and growth rate of the dynamic ballistic mode.

9. A plasma density limit rupture warning and mitigation system according to any one of claims 1 to 3, characterized in that: The spectrum analyzer (5) is used to analyze the data output by the disturbance measurement system (3), perform frequency identification through Fourier analysis, and output data as the dynamic ball mode frequency.

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