A feedback control method and system for tearing mold instability

Abstract

This invention belongs to, but is not limited to, the field of magnetic confinement fusion technology, and particularly relates to a method and system for feedback control of tearing mode instability, comprising: S1, driving and regulating a spiral current to provide a larger m / n perturbation field component; S2, regulating the spiral current in the scraped layer to achieve tearing mode control. This invention uses a plasma spiral loop to generate a perturbation field and applies feedback regulation to control the tearing mode. The external resonant perturbation field generated by the plasma-carried current is unaffected by neutron irradiation damage. Since the spiral current mainly flows along the magnetic field lines of the scraped layer, it has a helicity similar to that of the rational surface magnetic field lines, resulting in a resonant magnetic perturbation spectrum with good resonance characteristics with the plasma. Compared to traditional coil-generated perturbation fields, this current is located in the plasma scraped layer, closer to the tearing mode, with smaller radial attenuation; and the current flows along the magnetic field lines of the scraped layer, resulting in a higher resonant component proportion and higher overall effective intensity.

Description

Technical Field

[0001] This invention belongs to, but is not limited to, the field of magnetic confinement fusion technology, and particularly relates to a method and system for feedback control of tearing mode instability. Background Technology

[0002] Tear mode instability control is a crucial aspect of the safe and stable operation of magnetic confinement fusion devices. The growth of tear modes can lead to plasma fragmentation, thus requiring an efficient, stable, and flexible tear mode control strategy. External perturbation fields are a commonly used control method in fusion devices both domestically and internationally. However, conventional external perturbation fields require physical coils placed inside the vacuum chamber, which are difficult to withstand the high-flux neutron radiation in a fusion reactor. Therefore, a new control strategy is needed that can easily generate perturbation fields and efficiently control tear modes.

[0003] Currently, the main problems with controlling tearing modes using external perturbation fields are as follows;

[0004] 1) Static external disturbance field suppression of tearing mode is closely related to the state of tearing mode. For tearing modes with low rotation frequency and large mode amplitude, static disturbance field can only achieve deceleration and mode locking, but cannot suppress its amplitude, and is prone to mode locking failure.

[0005] 2) The perturbation field of feedback control has problems such as pulse component attenuation caused by eddy currents in the vacuum chamber wall and the introduction of DC component, and the effective component being weak due to the distance between the coil and the plasma, which makes it difficult to achieve the perturbation field strength required for control. In addition, the physical coil in the fusion reactor is susceptible to neutron irradiation damage, which poses a high challenge to the long-term durability of the coil. Furthermore, the frequency of the feedback perturbation field that the coil placed in the cladding can generate is limited, and it cannot reach the required high frequency range. Summary of the Invention

[0006] To address the problems existing in the prior art, the present invention provides a method and system for feedback control of tearing mold instability.

[0007] This invention is implemented as follows: a feedback control method for tearing mold instability, comprising:

[0008] S1 drives and regulates the spiral current, enabling it to provide a larger m / n disturbance field component.

[0009] S2, adjust the spiral current of the scraping layer to achieve tearing mold feedback control.

[0010] 1. Introduce an adaptive perturbation field control strategy

[0011] In S1, by introducing an adaptive perturbation field control strategy based on real-time magnetic field and current distribution, the system can monitor and analyze the current magnetic field resonance in real time. Based on the feedback signal of the m / n perturbation field, it automatically adjusts the operating parameters of the bias electrode or electron gun to maintain them under optimal resonance conditions. This method not only increases the resonance component of the perturbation field but also enhances the system's adaptability, ensuring effective control of the tearing mode instability under different operating conditions.

[0012] 2. Multilayer spiral current coupling drive

[0013] In S1, the system can be further optimized into a multi-layer helical current coupling drive control, employing multiple radially distributed helical current loops to drive different levels of the m / n perturbation field. By adjusting the phase, amplitude, and gas injection amount along the path of each layer of helical current, fine-tuning of different perturbation field components can be achieved, thereby enhancing the control of the tearing mode. This multi-layer coupling method can better cover a wide magnetic surface area, making the system's control of the tearing mode more precise and stable.

[0014] Furthermore, S1 specifically includes:

[0015] Helical current driving and modulation: Bias electrodes, bias target plates, or even an electron gun can be used to drive the helical current;

[0016] To ensure the helical current in the scraped layer provides a larger m / n perturbation field component, it's necessary to select an appropriate helicity of the magnetic field lines on the bias surface, allowing for a greater resonance proportion with the m / n rational surface. Adjusting the radial position of the bias can drive currents at different radial locations, and adjusting the magnitude of the bias can change the current magnitude. Appropriately filling the current path with gas to increase electron density further increases the current. Simultaneously, increasing the electrode size can yield a larger driving current, thus resulting in a considerable m / n perturbation field resonance component.

[0017] Furthermore, S2 specifically includes:

[0018] Modulation of the scraper layer spiral current to control the tearing mode: Since the effect of the disturbance field on the tearing mode is determined by the phase difference between the two, the spiral current of the scraper layer can be adjusted to achieve tearing mode control. Feedback control is employed to detect the tearing mode phase. A bias voltage is applied in certain phase intervals through a feedback controller, forming a pulsed spiral current. Because the driven spiral current is far from the vacuum chamber wall, cladding, and other conductive structures, the pulse component attenuation due to eddy current effects is small. Furthermore, the negative bias voltage is limited by ion saturation current, resulting in a small driving current and low utilization rate, thus eliminating the need for bipolar bias modulation. By adjusting the phase interval of the bias voltage application, the tearing mode frequency can be increased or its amplitude decreased, ultimately achieving tearing mode suppression.

[0019] Another object of the present invention is to provide a tearing mold instability feedback control system for implementing the tearing mold instability feedback control method, comprising:

[0020] The magnetic probe array and acquisition module are used to receive magnetic disturbance signals generated by plasma and send magnetic signals from different spatial locations to the phase online detection module.

[0021] The phase online detection module is used to receive magnetic signals from different positions, perform online phase detection, and send the phase signal to the feedback control module;

[0022] The feedback control module is used to receive the phase signal, perform feedback control based on the phase signal, and send the drive signal to the external trigger power supply module.

[0023] An external trigger power supply module is used to receive drive signals and perform corresponding actions based on the drive signals.

[0024] Another object of the present invention is to provide a system for feedback control of tear mode instability, comprising a helical current driving device and a helical current regulating device, wherein the helical current driving device drives the helical current through a bias electrode, a bias target plate or an electron gun, the helical current provides an m / n perturbation field component and resonates with the m / n rational surface in the plasma, thereby realizing the control of tear mode instability.

[0025] Furthermore, the spiral current control device can adjust the radial position of the bias electrode to change the spiral current intensity and spatial distribution at different radial positions. At the same time, by adjusting the bias voltage and increasing the electron density by filling the current path with gas, the current driving effect is enhanced.

[0026] Furthermore, the spiral current driving device increases the total amount of driving current by increasing the electrode size, thereby enhancing the resonant component of the m / n disturbance field, so as to more effectively control the instability of the tearing mode.

[0027] Furthermore, the scraping layer spiral current modulation device can adjust the spatial distribution and intensity of the scraping layer spiral current by designing the current path and bias voltage control, so as to provide a stable m / n resonant disturbance field component in the region where the tearing modulus is located, thereby effectively driving the rotation of the tearing modulus and suppressing the amplitude of the tearing modulus, and maintaining system stability.

[0028] First, this invention uses a plasma helical loop to carry current and generate a disturbance field, which is then fed back and controlled to regulate the tearing mode. Its main advantages are as follows:

[0029] 1. The external resonant perturbation field is generated by the plasma carrying current and is not damaged by neutron irradiation.

[0030] 2. Since the spiral current is mainly along the direction of the magnetic field lines of the scraped layer, it has a spirality similar to that of the magnetic field lines of the rational surface at the boundary, and the resulting magnetic disturbance spectrum has good resonance characteristics with the plasma.

[0031] 3. Compared with the disturbance field generated by traditional coils, this current is located in the plasma scraping layer, which is closer to the tearing mode and has less radial attenuation; moreover, the current flows along the magnetic field lines of the scraping layer, the resonant component has a higher proportion, and the overall effective strength is higher.

[0032] 4. The plasma carrier is far from the conductor structure such as the vacuum chamber wall and cladding, resulting in a small eddy current effect.

[0033] 5. The spiral current is located at the plasma boundary and is affected by the three-dimensional disturbance generated by the tearing mode in the plasma, which further improves its current modulation efficiency.

[0034] 6. Compared with physical perturbation field coils, the time response of the spiral current driven in the scraped layer is faster and the frequency is higher, the utilization rate of the perturbation field is higher, and the requirements for power supply equipment are lower.

[0035] Secondly, as supporting evidence of the inventiveness of this invention, it is also reflected in the following important aspects:

[0036] (1) The expected benefits and commercial value of the technical solution of this invention after transformation are as follows:

[0037] Replacing some physical coils for instability control in fusion devices saves on installation and subsequent maintenance costs; it can effectively prevent large plasma fractures, which is conducive to the safe and stable operation of the device and extends its service life; it is of great significance to promoting the development of future steady-state commercial fusion reactors.

[0038] (2) The technical solution of this invention fills a technical gap in the industry both domestically and internationally:

[0039] By modulating the spiral current in the plasma scraping layer region through feedback control, efficient control of tearing mode instability can be achieved.

[0040] (3) The technical solution of the present invention solves a technical problem that people have long wanted to solve but have never been able to solve successfully:

[0041] Feedback control using the perturbation magnetic field generated by a physical coil is difficult to handle high-frequency signals, and the coil is susceptible to neutron irradiation damage. Plasma current-carrying control is not subject to this limitation. Furthermore, traditional physical coils, due to their distance from the plasma and proximity to conductors such as the vacuum chamber walls and cladding, are affected by radial attenuation and eddy current effects, resulting in low efficiency in generating perturbation magnetic fields and making it difficult to control large tearing mode instabilities. This approach overcomes the limitations of using physical coils for feedback control of tearing mode instability.

[0042] Third, the tearing mode instability feedback control method of the present invention solves the key problems in plasma control and disturbance field regulation of the prior art by precisely driving and regulating the spiral current of the scraping layer, and brings significant technological progress to industrial applications.

[0043] First, this invention achieves precise control of the m / n disturbance field component by using a bias electrode, a bias target plate, or an electron gun to drive a spiral current. This method greatly improves the accuracy of the control system, resulting in a significant enhancement in control performance. Compared to traditional disturbance field generation strategies, this technical solution offers significant improvements in current ramp-up rate and efficiency, reduces the impact of eddy current effects, and enhances the strength and response speed of the generated magnetic field.

[0044] Secondly, by precisely adjusting the helical and radial positions of the bias electrodes, this invention achieves better resonance matching with the m / n rational surface, enhancing the effectiveness of the target resonance component. This optimized current path design not only increases the strength of the perturbing magnetic field but also expands the system's application range, making it suitable for various plasma environments requiring rapid response, and providing higher reliability and efficiency for applications such as precision manufacturing and materials processing.

[0045] Furthermore, by adjusting the bias voltage and radial position, combined with optimization of gas injection and electrode dimensions, this invention solves the problem of unstable current intensity in traditional control methods. Higher plasma density in the scraping layer and driving current effectively enhance the components of the m / n disturbance field, bringing greater economic benefits to equipment control and process optimization.

[0046] Furthermore, the method of this invention has strong practicality and potential for widespread application. Its equipment structure simplifies system installation and operation, reduces costs and maintenance requirements, and exhibits good compatibility with existing control equipment, facilitating rapid integration into industrial production lines. This innovative design aligns with the industrialization trend towards high efficiency and energy conservation, significantly improving the technological level of industrial control.

[0047] In summary, this invention significantly improves the control accuracy and stability of plasma disturbance fields through technological innovation, overcomes the problems of low efficiency and poor control effect in existing technologies, and has outstanding technological progress. It provides a reliable solution for industrial fields such as energy, materials and plasma processing, and has broad application prospects and significant industrialization value. Attached Figure Description

[0048] Figure 1 This is a flowchart of the tearing mold instability feedback control method provided in the embodiments of the present invention;

[0049] Figure 2 This is a schematic diagram of the electrode-driven spiral current model provided in an embodiment of the present invention;

[0050] Figure 3 This is a schematic diagram of the radial disturbance field components generated at the plasma edge by a scraping layer current with an amplitude of 200A, provided in an embodiment of the present invention.

[0051] Figure 4 This is a flowchart illustrating the operational structure of the tearing mold instability feedback control system provided in this embodiment of the invention.

[0052] Figure 5 This is a comparison chart of current simulation waveforms under two strategies: solid coil and spiral current.

[0053] Figure 6 This is a waveform diagram of the driving current in a conventional physical coil experiment provided in an embodiment of the present invention;

[0054] Figure 7 This is an experimental waveform diagram of the spiral current of the scraping layer under the plasma current-carrying control strategy provided in the embodiments of the present invention. Detailed Implementation

[0055] To make the objectives, technical solutions, and advantages of this invention clearer, the invention will be further described in detail below with reference to embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the invention.

[0056] like Figure 1 As shown, the tearing mold instability feedback control method provided in this embodiment of the invention mainly consists of the following two steps:

[0057] S1 drives and regulates the spiral current, enabling it to provide a larger m / n disturbance field component.

[0058] S2, adjust the spiral current of the scraping layer to achieve tearing mold control.

[0059] like Figure 2 As shown, bias electrodes, bias targets, or even an electron gun can be used to drive the spiral current.

[0060] like Figure 3 As shown, to provide a larger m / n perturbation field component for the spiral current in the scraping layer, it is necessary to select an appropriate helicity of the magnetic field lines on the bias surface to maximize its resonance with the m / n rational surface. Adjusting the radial position of the bias voltage can drive currents at different radial positions, and adjusting the magnitude of the bias voltage can change the magnitude of the current. Appropriately filling the current path with gas to increase electron density will increase the current. Simultaneously, increasing the electrode size can yield a larger driving current, thus obtaining a considerable m / n perturbation field resonance component. The vertical axis represents magnetic flux density in Gauss, and the horizontal axis represents the circumferential modulus m.

[0061] The working principle of the tearing die instability feedback control method:

[0062] 1. Adjusting the spiral current to drive the perturbation field components

[0063] The core of feedback control for tearing mode instability lies in providing a stronger m / n perturbation field component by regulating the helical current. First, current is injected into the scraped layer plasma by introducing a bias electrode, bias target, or electron gun as a driving device. This helical current, through the coupling between the boundary plasma and the current, generates a perturbation field of a specific spectrum at the rational surface. By selecting appropriate driving methods and parameters, a perturbation field component resonating with the tearing mode m / n rational surface can be effectively formed on the magnetic surface.

[0064] 2. Regulation of the spiral current in the scraping layer

[0065] To further enhance the control effect of the perturbation field, precise control of the spiral current in the scraping layer is required. The intensity of the spiral current can be altered by changing the bias voltage, and the position of the spiral current can be changed by adjusting the radial position of the bias electrode, thus achieving control over a specific radial region. Furthermore, appropriate gas filling along the current path increases the electron density, thereby increasing the current intensity. These measures enable the spiral current in the scraping layer to provide a larger m / n perturbation field resonant component, effectively suppressing the tearing mode.

[0066] 3. Resonance Adjustment of Magnetic Surface Helicity

[0067] like Figure 3 As shown, the helicity of the magnetic surface is a key factor affecting the resonance effect. By adjusting the helical angle of the magnetic field lines where the bias electrode is located, the helicity of the magnetic surface where the electrode is located is matched with the tearing mode, maximizing the resonance effect of the m / n rational surface. This process requires precise calculation and adjustment based on the trajectory of the magnetic field lines and the characteristic parameters of the tearing mode to ensure a stronger resonance effect in the target area.

[0068] 4. Measures to enhance drive current

[0069] To further enhance the effect of the driving current, various technical measures can be adopted. For example, increasing the size of the bias electrode can significantly increase the total amount of driving current. Simultaneously, by optimizing the magnitude and distribution of the bias voltage, the driving current can be more uniformly distributed on the magnetic surface, thereby providing a stronger m / n perturbation field component. Furthermore, combining this with gas filling technology along the electrode path can increase electron density and further enhance the current intensity.

[0070] 5. Dynamic feedback control mechanism

[0071] Throughout the control process, the dynamic behavior of the tearing mode in the plasma is monitored in real time, and the timing and distribution of the bias voltage are dynamically adjusted based on the feedback signal from phase detection. The parameters of the bias electrode or target plate can be adjusted in real time according to the monitoring results to ensure that the effect of the disturbance field is always within the range of driving rotation and reducing amplitude, thereby achieving rapid response and effective suppression of tearing mode instability.

[0072] 6. Overall Effects and Application Scenarios

[0073] Using the methods described above, the driving of the helical current and the regulation of the scraping layer can form a resonant structure with a high m / n perturbation field component on the magnetic surface, thereby effectively suppressing tearing mode instability. This method is applicable to the field of high-temperature plasma confinement, especially tearing mode control in magnetic confinement nuclear fusion devices. Combined with bias electrodes, electron guns, and other technologies, efficient control of different magnetic surface regions can be achieved, improving the stability and operating efficiency of the system.

[0074] The tearing mold instability feedback control method of the present invention achieves more effective m / n disturbance field components by precisely controlling the spiral current of the scraping layer. Specifically, it is divided into the following two steps, which are reflected in the driving and modulation of the spiral current and the regulation of the scraping layer current, respectively.

[0075] First, in step S1, the m / n perturbation field component is enhanced by driving and regulating the spiral current. The spiral current can be driven in various ways, including using bias electrodes, bias targets, or introducing an electron gun. The device driving the spiral current needs to be adjusted according to the design objectives so that the current path can better adapt to the target perturbation field, maximizing the efficiency of the m / n component. This step forms the basis of the control method, enabling more precise regulation of the subsequent scraping layer current.

[0076] Secondly, to enhance the m / n perturbation field component, the tilt angle of the magnetic field lines where the bias electrode is placed is crucial. In the design, the electrode should be placed on specific magnetic field lines to maximize resonance matching with the m / n rational surface. This selection ensures a reasonable distribution of the magnetic field components, making the resonance effect more concentrated and effective. By rationally designing the bias position on the magnetic surface, the matching with the target resonance surface can be significantly increased, thereby enhancing the effective components of the perturbation field.

[0077] Adjusting the radial position of the bias voltage is an effective way to regulate the spiral current in the radial direction. By adjusting the bias voltage at different radial positions, current can be driven to appear at different radial positions, thus covering different current paths. This feature makes operation more flexible and allows for optimization of the spiral current distribution range according to different control requirements and target areas.

[0078] The magnitude of the bias voltage determines the intensity of the current. Increasing the bias voltage increases the amplitude of the spiral current, thereby enhancing the strength of the m / n component. This operation, in conjunction with the adjustment of the radial position, optimizes the m / n component throughout the current path, resulting in the desired perturbation magnetic field component.

[0079] To further enhance the effect of the driving spiral current, an appropriate amount of gas can be introduced into the current path. Increasing the gas concentration in the current path can improve the electron density, which, in turn, allows for a higher perturbation field component by increasing the current intensity. Furthermore, increasing the electrode size also significantly increases the driving current, resulting in a more pronounced perturbation field effect and a more ideal overall m / n component of the system.

[0080] In step S2, the regulation of the spiral current in the scraping layer further stabilizes the tearing modulus. This step, based on the aforementioned regulation of the spiral current, achieves accurate instability control of the target position. Through this synergistic effect, the control system can adjust the output of the spiral current in real time, ultimately achieving instability control of the tearing modulus and precise feedback control of the overall magnetic field disturbance, significantly improving the controllability of the operation and the sensitivity of the system response.

[0081] The tearing mode instability feedback control method in this embodiment of the invention achieves effective control of the tearing mode by driving and regulating a spiral current. First, in step S1, a larger m / n perturbation field component is provided by driving the spiral current. Driving the spiral current can be achieved in various ways, including using bias electrodes, bias targets, or introducing an electron gun. Driving the spiral current is the core of the tearing mode control in this method. By using different electrodes or electron guns, the magnitude and direction of the current can be flexibly adjusted to enhance the m / n perturbation field component under specific magnetic field conditions, thereby effectively intervening in the instability of the tearing mode.

[0082] Next, the driving helical current needs to resonate with the m / n rational surface of the plasma. This requires carefully selecting the helicity of the magnetic field lines on the bias surface to achieve a higher resonance fraction with the m / n rational surface. During this process, adjusting the radial position of the bias can drive currents at different radial positions, thereby altering the spatial distribution of the helical current. Adjusting the magnitude of the bias can further influence the current intensity. Simultaneously, increasing the electron density by filling the current path with gas can enhance the current driving effect. Furthermore, appropriately increasing the electrode size can increase the total driving current, further increasing the resonant component of the m / n perturbation field, thereby enhancing the control over tearing mode instability.

[0083] In step S2, modulating the helical current of the scraping layer is a crucial step in controlling the tearing modulus. Modulation of the scraping layer helical current primarily involves altering its spatiotemporal distribution and intensity to ensure sufficient stabilization in the tearing modulus region. Through precise current path design and bias voltage control, the scraping layer helical current can generate a stable m / n disturbance field component in the tearing modulus region. This stable disturbance field not only suppresses the amplitude of the tearing modulus but also effectively drives its rotation, maintaining the stability of the entire device's operation.

[0084] By driving and modulating the aforementioned helical current, instability control of the tearing mode is achieved. The feedback control method of this invention, through reasonable helical current driving and scraping layer current modulation, can significantly enhance the resonance effect of the m / n disturbance field, achieving precise control of the tearing mode. This method not only improves control accuracy but also effectively reduces energy consumption in traditional tearing mode control methods, enhancing system stability and control efficiency.

[0085] like Figure 4 As shown, since the effect of the disturbance field on the tearing mode is determined by the phase difference between the two, the spiral current of the scraping layer can be adjusted to achieve tearing mode control. Feedback control is employed to detect the tearing mode phase and apply bias voltage in certain phase intervals via a feedback controller, forming a modulated pulsed spiral current. Because the driven spiral current is far from the vacuum chamber wall, cladding, and other conductive structures, the pulse component attenuation due to the eddy current effect is small. Simultaneously, the negative bias voltage is limited by the ion saturation current, resulting in a small driving current and low utilization rate; therefore, this method does not employ bipolar bias voltage modulation. By adjusting the phase interval of the bias voltage input, the tearing mode frequency increases and the amplitude decreases, ultimately achieving tearing mode suppression.

[0086] like Figure 4 As shown, the tearing mold instability feedback control system provided in this embodiment of the invention includes:

[0087] The magnetic probe array and acquisition module are used to receive magnetic disturbance signals generated by plasma and send magnetic signals from different spatial locations to the phase online detection module.

[0088] The phase online detection module is used to receive magnetic signals from different positions, perform online phase detection, and send the phase signal to the feedback control module;

[0089] The feedback control module is used to receive the phase signal, perform feedback control based on the phase signal, and send the drive signal to the external trigger power supply module.

[0090] An external trigger power supply module is used to receive drive signals and perform corresponding actions based on the drive signals.

[0091] The tearing mode instability feedback control system monitors magnetic disturbance signals generated by the plasma through a magnetic probe array and a data acquisition module. The magnetic probe array is positioned at key locations to capture changes in the magnetic field within the plasma, and the circumferential and poloidal modes of the tearing mode are determined by analyzing the signals. The data acquisition module converts these magnetic signals into electrical signals and transmits them to the online phase detection module, providing real-time data for subsequent feedback control.

[0092] After receiving magnetic signals from different locations, the phase online detection module performs online phase detection to analyze the real-time dynamic behavior of the tearing mode. The detection module calculates phase changes in real time and generates phase signal data. This data is further transmitted to the feedback control module as key parameters for feedback regulation.

[0093] After receiving the phase signal, the feedback control module analyzes the phase state and stability of the current tearing mode based on a preset control algorithm. It calculates the required control quantity, generates a drive signal, and sends the signal to an external trigger power supply module to implement the feedback control operation.

[0094] After receiving the drive signal generated by the feedback control module, the external trigger power supply module performs corresponding actions according to the specific requirements of the signal (such as amplitude, frequency, phase, etc.). The trigger power supply intervenes in the plasma magnetic disturbance by outputting current or voltage, adjusts the behavior of the tearing mode, suppresses instability, and thus improves the overall stability of the plasma.

[0095] The core control process of this system is implemented through computer equipment, whose memory stores the computer program that executes the feedback control algorithm. When the processor runs this program, it can coordinate the interaction between the magnetic probe array, the phase detection module, and the feedback control module to complete the monitoring, control, and adjustment of the tearing modulus in real time.

[0096] The information data processing terminal integrates the entire tearing mode instability feedback control system, responsible for the full-process management of data acquisition, signal processing, and feedback control. Through its efficient information processing capabilities, the terminal executes tearing mode feedback control operations in real time and provides accurate basic data for subsequent control optimization and experimental research.

[0097] This system effectively suppresses tearing mode instability by precisely acquiring magnetic disturbance signals, conducting online phase detection, and coordinating with a feedback control module to adjust the response of the external trigger power supply in real time. Its automated control process, based on computer programs and a data processing terminal, provides an advanced solution for plasma research.

[0098] Example 1: Tear Mode Control in Nuclear Fusion Plasma

[0099] In nuclear fusion plasma devices, such as tokamak devices, the instability of tearing modes can affect the confinement performance of the plasma, reduce the effective utilization of energy, and even lead to heat and material loss within the device. The spiral current feedback control method of this invention can be applied to the control of tearing modes in nuclear fusion plasmas. By adjusting the position, magnitude, and timing of the bias voltage, the spiral current is driven and the current in the scraping layer is controlled, enhancing the m / n perturbation field component and effectively suppressing tearing modes. This method can precisely control the magnetic field distribution within the plasma, reducing energy loss caused by tearing modes, thereby improving the stability and efficiency of the nuclear fusion reaction.

[0100] Example 2: Magnetohydrodynamic Instability Control in a Ground-Based Simulation of a Space Environment and Other Cryogenic Plasma Devices

[0101] In cryogenic plasma devices such as those simulating ground-based space environments, magnetohydrodynamic instability is a significant factor affecting device stability, adversely impacting system research and environmental simulation. This invention proposes a current-carrying feedback control method. By guiding the current through a bias target plate or electron gun, the method modulates the current to enhance the magnetic field on a specific magnetic surface, stabilizing the magnetic field distribution within the simulation device. This method effectively suppresses magnetohydrodynamic instability, ensuring high-precision operation of ground-based space environment simulation devices and improving the reliability and consistency of experimental data, providing technical support for the further development of physics experiments.

[0102] In traditional disturbance field control strategies, after applying voltage, the current is affected by the coil inductance, often resulting in a slow ramp-up rate and low utilization. Simulations were performed using a 200V, 1kHz pulse square wave. Figure 5 (a) shows the voltage and current waveforms on the physical coil. Figure 5 (b) shows the voltage and the spiral current waveform of the scraping layer. The blue line represents the voltage in V; the black line represents the current in A; and the horizontal axis is in ms.

[0103] This can also be verified in experiments. The current ramp-up rate of the physical coil is slow and the utilization rate is low. Furthermore, due to the influence of eddy current effect, the pulse component of the magnetic field generated by the current is further attenuated, and the strength of the generated disturbance magnetic field is further reduced. Figure 6 This is the driving current on the physical coil of the perturbation field in the experiment.

[0104] This method employs plasma-carrying controlled tearing mode, whose main advantages are a fast current ramp-up rate and minimal susceptibility to eddy current effects, thus significantly improving the efficiency of generating the perturbed magnetic field. Some experimental results are shown below. Figure 7 The figure shows the spiral current waveform of the scraped layer in the experiment. The horizontal axis is the time axis, with the unit being ms, and the vertical axis is the normalized current.

[0105] Experimental measurements show that, taking the 2 / 1 component as an example, the ability to generate a perturbation magnetic field can be greatly improved by using plasma current-carrying control. The resonant perturbation field strength generated by the traditional perturbation field solid coil is 2.5 Gauss / kA, while the resonant perturbation field strength in this method reaches 6.1 Gauss / kA, which greatly improves its utilization efficiency and reduces the requirements for power supply parameters.

[0106] It should be noted that embodiments of the present invention can be implemented in hardware, software, or a combination of both. The hardware portion can be implemented using dedicated logic; the software portion can be stored in memory and executed by a suitable instruction execution system, such as a microprocessor or dedicated-design hardware. Those skilled in the art will understand that the above-described devices and methods can be implemented using computer-executable instructions and / or included in processor control code, for example, such code provided on a carrier medium such as a disk, CD, or DVD-ROM, a programmable memory such as read-only memory (firmware), or a data carrier such as an optical or electronic signal carrier. The devices and modules of the present invention can be implemented by hardware circuitry such as very large-scale integrated circuits or gate arrays, semiconductors such as logic chips, transistors, or programmable hardware devices such as field-programmable gate arrays, programmable logic devices, etc., or by software executed by various types of processors, or by a combination of the above-described hardware circuitry and software, such as firmware.

[0107] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications, equivalent substitutions, and improvements made by those skilled in the art within the scope of the technology disclosed in the present invention, and within the spirit and principles of the present invention, should be covered within the scope of protection of the present invention.

Claims

1. A feedback control method for tearing mold instability, characterized in that, include: S1 drives and regulates the spiral current, enabling it to provide a larger m / n disturbance field component; S2, adjust the spiral current of the scraping layer to achieve tearing mold control; S1 specifically includes: Helical current driving and modulation: The helical current can be driven by means of bias electrodes, bias target plates or introducing electron guns; By selecting an appropriate helicity of the magnetic field lines of the biased magnetic surface, the resonance component with the m / n rational surface is increased, and the radial bias driving current at different positions is adjusted. S2 specifically includes: Modulated scraping layer spiral current control tearing modulus: Feedback control is adopted to detect the phase of the tearing modulus in real time and apply bias voltage in a specific phase range to generate spiral current; By adjusting the phase range of the bias voltage, the frequency of the tearing mode can be increased or the amplitude can be decreased, ultimately achieving tearing mode suppression. The feedback control system effectively suppresses tearing mode instability by detecting the tearing mode phase in real time and adjusting the timing of bias application, thereby precisely controlling the intensity and distribution of the spiral current.

2. A tearing mode instability feedback control system for implementing the tearing mode instability feedback control method as described in claim 1, characterized in that, include: The spiral current driving device and the spiral current regulating device, wherein the spiral current driving device drives the spiral current through a bias electrode, a bias target plate or an electron gun, the spiral current provides an m / n perturbation field component and resonates with the m / n rational surface of the plasma, thereby realizing the instability control of the tearing mode.

3. The system according to claim 2, characterized in that, The spiral current control device can adjust the radial position of the bias electrode to change the spiral current intensity and spatial distribution at different radial positions. At the same time, it can enhance the current driving effect by adjusting the bias voltage and increasing the electron density by filling the current path with gas.

4. The system according to claim 2, characterized in that, The spiral current driving device increases the total amount of driving current by increasing the electrode size, thereby enhancing the resonant component of the m / n disturbance field, so as to more effectively control the instability of the tearing mode.

5. The system according to claim 2, characterized in that, The scraping layer spiral current modulation device can adjust the spatial distribution and intensity of the scraping layer spiral current by designing the current path and bias voltage control, so as to provide a stable m / n resonant disturbance field component in the region where the tearing modulus is located, thereby effectively driving the rotation of the tearing modulus and suppressing the amplitude growth, and maintaining the stability of the system operation.

Images