A microwave isolator compensation device and method

Abstract

The application discloses a microwave isolator compensation device and method, which comprises a compensation module, a processor, a klystron power monitoring module and a plurality of temperature sensors; the input end of the klystron power monitoring module is connected with the power output end of the klystron to monitor the output power of the klystron and the reflected microwave signal power, the output end of the klystron power monitoring module is connected with the input end of the processor; the temperature sensors are used for detecting the temperature information of the microwave isolator in the low noise system, and the output end of the temperature sensors is connected with the input end of the processor; the output end of the processor is connected with the compensation module, and the compensation module is used for generating a compensation magnetic field in the microwave isolator. The application can ensure that the microwave isolator can effectively isolate the reflected signal in the nuclear fusion experiment process and protect the safety of the klystron.

Description

Technical Field

[0001] This invention relates to the field of controlled thermonuclear fusion technology, and in particular to a microwave isolator compensation device and method. Background Technology

[0002] Low-hybrid microwave systems are widely used in nuclear fusion experiments, primarily for current-driven operation and auxiliary heating. These systems are large microwave systems composed of multiple high-power klystrons. During nuclear fusion experiments, due to the complexity of the plasma state, poor coupling between the plasma and microwaves often results in significant microwave reflection. Low-hybrid systems typically employ high-power microwave isolators to isolate reflected signals and protect the klystrons. However, with the rapid development of nuclear fusion and increasingly longer experimental durations, the material properties of high-power microwave isolators change with temperature over extended periods, affecting their isolation effectiveness. Excessive reflected signal power can damage the klystron, failing to meet the requirements of low-hybrid systems for high-power microwave isolators. Therefore, a microwave isolator compensation device is needed to ensure that high-power microwave isolators can effectively isolate reflected signals during nuclear fusion experiments. Summary of the Invention

[0003] This invention provides a microwave isolator compensation device and method, which can control the compensation module to generate a compensation magnetic field in the microwave isolator based on the received output power of the klystron, the power of the reflected microwave signal, and the temperature information of the microwave isolator. This ensures that the microwave isolator can always effectively isolate the reflected signal during the nuclear fusion experiment and protect the equipment safety of the klystron.

[0004] To address the aforementioned technical problems, the first aspect of this invention provides a microwave isolator compensation device, comprising a compensation module, a processor, a klystron power monitoring module, and several temperature sensors.

[0005] The input terminal of the klystron power monitoring module is connected to the power output terminal of the klystron to monitor the output power of the klystron and the reflected microwave signal power. The output terminal of the klystron power monitoring module is connected to the input terminal of the processor.

[0006] The temperature sensor is used to detect the temperature information of the microwave isolator in the low-clutter system, and the output terminal of the temperature sensor is connected to the input terminal of the processor.

[0007] The processor's output is connected to the compensation module, which is used to generate a compensation magnetic field in the microwave isolator.

[0008] As a preferred embodiment, the compensation module includes a constant current source and a compensation coil disposed in the microwave isolator;

[0009] The processor's output terminal is connected to the input terminal of the constant current source, and the constant current source's output terminal is connected to the input terminal of the compensation coil. The compensation coil is used to generate a compensation magnetic field in the microwave isolator.

[0010] As a preferred embodiment, the klystron power monitoring module includes a directional coupler, a detector, and an isolation amplifier;

[0011] The input terminal of the directional coupler is connected to the power output terminal of the klystron to monitor the output power and the reflected microwave signal power. The coupling output terminal of the directional coupler is connected to the input terminal of the detector. The output terminal of the detector is connected to the input terminal of the isolation amplifier. The output terminal of the isolation amplifier is connected to the input terminal of the processor.

[0012] As a preferred embodiment, the device further includes a compensation triggering module;

[0013] The input terminal of the compensation trigger module is used to receive the trigger signal sent by the master control device in the low clutter system, and the control terminal of the compensation trigger module is connected to the controlled terminal of the processor.

[0014] As a preferred embodiment, the temperature sensor includes a first temperature sensor for detecting the inlet temperature of the cooling water of the microwave isolator, a second temperature sensor for detecting the outlet temperature of the cooling water of the microwave isolator, and a third temperature sensor for detecting the ambient temperature.

[0015] A second aspect of the present invention provides a microwave isolator compensation method, executed by a processor in the microwave isolator compensation device according to any one of the first aspects, comprising:

[0016] When the compensation process is detected to be started, the output power of the klystron and the reflected microwave signal power are received from the klystron power monitoring module.

[0017] Temperature information from the microwave isolator is received from several temperature sensors;

[0018] According to the preset compensation mode, the compensation current value is determined based on the output power, the reflected microwave signal power, or the temperature information.

[0019] The compensation current value is sent to the compensation module so that the compensation module generates a compensation magnetic field in the microwave isolator based on the compensation current value.

[0020] As a preferred embodiment, the temperature information includes the cooling water inlet temperature of the microwave isolator, the cooling water outlet temperature of the microwave isolator, and the ambient temperature.

[0021] The step of determining the compensation current value based on the output power, the reflected microwave signal power, or the temperature information according to a preset compensation mode specifically includes:

[0022] When the compensation mode is open-loop mode, the compensation current value is determined based on the cooling water inlet temperature, the cooling water outlet temperature, and the ambient temperature using the following expression:

[0023]

[0024] Where I represents the compensation current value; T in Indicates the inlet temperature of the cooling water; T out T0 represents the outlet temperature of the cooling water; T0 represents the ambient temperature; a, b, c, d, e, and f represent the first preset coefficient, the second preset coefficient, the third preset coefficient, the fourth preset coefficient, the fifth preset coefficient, and the sixth preset coefficient, respectively.

[0025] As a preferred embodiment, determining the compensation current value based on the output power, the reflected microwave signal power, or the temperature information according to a preset compensation mode specifically includes:

[0026] When the compensation mode is closed-loop mode, the working state of the microwave isolator is determined based on the comparison result between the ratio between the reflected microwave signal power and the output power and the preset ratio threshold.

[0027] When the microwave isolator is determined to be in an abnormal operating state, an initial compensation current value is randomly generated.

[0028] After sending the current compensation current value to the compensation module, the current reflected microwave signal power continues to be received from the klystron power monitoring module. When the current reflected microwave signal power is greater than the preset power threshold, the current compensation current value is adjusted. This step is repeated until the current reflected microwave signal power is less than or equal to the power threshold, and the current compensation current value is taken as the target compensation current value.

[0029] As a preferred embodiment, the compensation module includes a constant current source and a compensation coil disposed in the microwave isolator;

[0030] The step of sending the compensation current value to the compensation module, so that the compensation module generates a magnetic field in the microwave isolator based on the compensation current value, specifically includes:

[0031] The compensation current value is sent to the constant current source so that the constant current source sends a compensation current to the compensation coil based on the compensation current value, so that the compensation coil generates a compensation magnetic field in the microwave isolator.

[0032] As a preferred embodiment, the microwave isolator compensation device includes a compensation trigger module;

[0033] The method further includes:

[0034] When a compensation start signal is received from the compensation trigger module, the compensation process is determined to be started.

[0035] Compared with the prior art, the beneficial effect of the embodiments of the present invention is that the processor can control the compensation module to generate a compensation magnetic field in the microwave isolator based on the received output power of the klystron, the power of the reflected microwave signal, and the temperature information of the microwave isolator, thereby ensuring that the microwave isolator can always effectively isolate the reflected signal during the nuclear fusion experiment and protect the equipment safety of the klystron. Attached Figure Description

[0036] Figure 1 This is a schematic diagram of a preferred embodiment of the microwave isolator compensation device in this invention;

[0037] Figure 2 This is a schematic diagram of another preferred embodiment of the microwave isolator compensation device in this invention;

[0038] Figure 3 This is a schematic flowchart of the microwave isolator compensation method in an embodiment of the present invention;

[0039] Figure 4 This is a graph showing the variation of output power and reflected microwave signal power in an embodiment of the present invention. Detailed Implementation

[0040] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, and not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0041] Please see Figure 1 The first aspect of the present invention provides a microwave isolator compensation device, including a compensation module 1, a processor 2, a klystron power monitoring module 3, and a plurality of temperature sensors 4;

[0042] The input terminal of the klystron power monitoring module 3 is connected to the power output terminal of the klystron to monitor the output power of the klystron and the reflected microwave signal power. The output terminal of the klystron power monitoring module 3 is connected to the input terminal of the processor 2.

[0043] The temperature sensor 4 is used to detect the temperature information of the microwave isolator in the low clutter system, and the output terminal of the temperature sensor 4 is connected to the input terminal of the processor 2.

[0044] The output terminal of the processor 2 is connected to the compensation module 1, which is used to generate a compensation magnetic field in the microwave isolator.

[0045] Specifically, considering that during nuclear fusion experiments, the material properties of microwave isolators in low-hybrid systems change with temperature over long periods of operation, leading to a deterioration in their isolation effect on reflected signals, the temperature information of the microwave isolator, the output power of the klystron, and the power of the reflected microwave signal all reflect the current performance status of the microwave isolator, thus providing a reference for compensation. Therefore, this embodiment uses several temperature sensors 4 to detect the temperature information of the microwave isolators in the low-hybrid system, and a klystron power monitoring module 3 to monitor the output power of the klystron and the power of the reflected microwave signal. The temperature information collected by the temperature sensors 4 and the power data monitored by the klystron power monitoring module 3 are both transmitted to the processor 2. Based on the acquired temperature information and power data, the processor 2 calculates and determines the current compensation current value. This compensation current value is used to control the compensation module 1 to generate a compensation magnetic field in the microwave isolator, thereby optimizing the electromagnetic characteristics of the microwave isolator, compensating for the performance degradation caused by temperature changes, and ultimately ensuring effective isolation of reflected signals during nuclear fusion experiments, protecting the safety of the klystron equipment.

[0046] Please see Figure 2 As a preferred embodiment, the compensation module 1 includes a constant current source 11 and a compensation coil 12 disposed in the microwave isolator;

[0047] The output terminal of the processor 2 is connected to the input terminal of the constant current source 11, and the output terminal of the constant current source 11 is connected to the input terminal of the compensation coil 12. The compensation coil 12 is used to generate a compensation magnetic field in the microwave isolator.

[0048] Specifically, the compensation module 1 in this embodiment includes a constant current source 11 and a compensation coil 12 disposed in the microwave isolator. The output terminal of the processor 2 is connected to the input terminal of the constant current source 11 to send the current compensation current value to the constant current source 11. The constant current source 11 is used to output a compensation current to the compensation coil 12 based on the received compensation current value, so that the compensation coil 12 can generate a compensation magnetic field in the microwave isolator.

[0049] As a preferred embodiment, the klystron power monitoring module 3 includes a directional coupler 31, a detector 32, and an isolation amplifier 33;

[0050] The input terminal of the directional coupler 31 is connected to the power output terminal of the klystron to monitor the output power and the reflected microwave signal power. The coupling output terminal of the directional coupler 31 is connected to the input terminal of the detector 32. The output terminal of the detector 32 is connected to the input terminal of the isolation amplifier 33. The output terminal of the isolation amplifier 33 is connected to the input terminal of the processor 2.

[0051] Specifically, the klystron power monitoring module 3 in this embodiment further includes a directional coupler 31, a detector 32, and an isolation amplifier 33. It can be understood that the directional coupler 31 can be installed at the power output terminal of the klystron, thereby enabling the monitoring of the output power of the klystron and the reflected microwave signal power returned after isolation by the microwave isolator. The detector 32 is used to convert the monitored output power and reflected microwave signal power into voltage signals, while the isolation amplifier 33 is used to further amplify the converted voltage signals for subsequent processor 2 to determine the compensation current value.

[0052] As a preferred embodiment, the device further includes a compensation triggering module 5;

[0053] The input terminal of the compensation trigger module 5 is used to receive the trigger signal sent by the master control device in the low clutter system, and the control terminal of the compensation trigger module 5 is connected to the controlled terminal of the processor 2.

[0054] Specifically, the microwave isolator compensation device in this embodiment further includes a compensation trigger module 5. It is understood that the input terminal of the compensation trigger module 5 is used to receive a trigger signal sent by the master control device in the low-spur system. This trigger signal can be used to determine the start and end of the current low-spur system discharge. Then, by connecting the control terminal of the compensation trigger module 5 to the controlled terminal of the processor 2, the compensation trigger module 5 can send a compensation start / stop signal to the processor 2 to control the start and stop of the entire microwave isolator compensation device. For example, when the trigger signal received by the compensation trigger module 5 is high, it indicates that the microwave isolator compensation device needs to be started and the compensation process initiated; therefore, the compensation trigger module 5 sends a compensation start signal to the processor 2. When the trigger signal received by the compensation trigger module 5 is low, it indicates that the microwave isolator compensation device needs to enter a waiting state and the compensation process stopped; therefore, the compensation trigger module 5 sends a compensation stop signal to the processor 2.

[0055] As a preferred embodiment, the temperature sensor 4 includes a first temperature sensor for detecting the inlet temperature of the cooling water of the microwave isolator, a second temperature sensor for detecting the outlet temperature of the cooling water of the microwave isolator, and a third temperature sensor for detecting the ambient temperature.

[0056] The microwave isolator compensation device provided in this embodiment of the invention can control the compensation module 1 to generate a compensation magnetic field in the microwave isolator based on the received output power of the klystron, the power of the reflected microwave signal, and the temperature information of the microwave isolator by the processor 2. This ensures that the microwave isolator can always effectively isolate the reflected signal during the nuclear fusion experiment, avoid the occurrence of klystron arcing, and protect the equipment safety of the klystron.

[0057] Please see Figure 3 The second aspect of the present invention provides a microwave isolator compensation method, executed by a processor in the microwave isolator compensation device described in any embodiment of the first aspect, comprising the following steps S1 to S4:

[0058] Step S1: When the compensation process is detected to be started, the output power of the klystron and the reflected microwave signal power are received from the klystron power monitoring module.

[0059] Step S2: Receive temperature information of the microwave isolator from several temperature sensors;

[0060] Step S3: Determine the compensation current value based on the output power, the reflected microwave signal power, or the temperature information according to the preset compensation mode.

[0061] Step S4: The compensation current value is sent to the compensation module so that the compensation module generates a compensation magnetic field in the microwave isolator based on the compensation current value.

[0062] Specifically, when the compensation process is detected to be started, in order to accurately determine the current required compensation current value, it is necessary to receive the output power of the klystron, the reflected microwave signal power from the klystron power monitoring module, and the temperature information of the microwave isolator from several temperature sensors. Then, according to the pre-set compensation mode, the current compensation current value is determined and sent to the compensation module, which generates a compensation magnetic field in the microwave isolator based on the compensation current value.

[0063] As a preferred embodiment, the temperature information includes the cooling water inlet temperature of the microwave isolator, the cooling water outlet temperature of the microwave isolator, and the ambient temperature.

[0064] The step of determining the compensation current value based on the output power, the reflected microwave signal power, or the temperature information according to a preset compensation mode specifically includes:

[0065] When the compensation mode is open-loop mode, the compensation current value is determined based on the cooling water inlet temperature, the cooling water outlet temperature, and the ambient temperature using the following expression:

[0066]

[0067] Where I represents the compensation current value; T in Indicates the inlet temperature of the cooling water; T out T0 represents the outlet temperature of the cooling water; T0 represents the ambient temperature; a, b, c, d, e, and f represent the first preset coefficient, the second preset coefficient, the third preset coefficient, the fourth preset coefficient, the fifth preset coefficient, and the sixth preset coefficient, respectively.

[0068] It is worth noting that the compensation modes for the microwave isolator in this embodiment include open-loop mode and closed-loop mode. In the open-loop mode, the compensation current value is calculated by measuring the cooling water inlet temperature, cooling water outlet temperature and ambient temperature of the microwave isolator based on the pre-set relationship between various temperature information and compensation current value, so as to compensate for the performance changes of the microwave isolator caused by temperature changes and ensure the safe operation of the klystron.

[0069] Specifically, the first, second, third, fourth, fifth, and sixth preset coefficients in the above expression are obtained by fitting the measured values ​​of the cooling water inlet temperature, cooling water outlet temperature, and ambient temperature of the microwave isolator under different reflected microwave signal power conditions, as well as the measured value of the compensation current corresponding to reducing the current reflected microwave signal power to a preset power threshold or approaching 0.

[0070] As a preferred embodiment, determining the compensation current value based on the output power, the reflected microwave signal power, or the temperature information according to a preset compensation mode specifically includes:

[0071] When the compensation mode is closed-loop mode, the working state of the microwave isolator is determined based on the comparison result between the ratio between the reflected microwave signal power and the output power and the preset ratio threshold.

[0072] When the microwave isolator is determined to be in an abnormal operating state, an initial compensation current value is randomly generated.

[0073] After sending the current compensation current value to the compensation module, the current reflected microwave signal power continues to be received from the klystron power monitoring module. When the current reflected microwave signal power is greater than the preset power threshold, the current compensation current value is adjusted. This step is repeated until the current reflected microwave signal power is less than or equal to the power threshold, and the current compensation current value is taken as the target compensation current value.

[0074] It is worth noting that the closed-loop mode is based on real-time output power and reflected microwave signal power. Feedback control is used to change the compensation current value, thereby altering the performance of the microwave isolator. This ensures the high-power microwave isolator always operates at its optimal state, actively controlling the reflected microwave signal power at the klystron port to prevent arcing and protect the klystron's operational safety. Specifically, as the low-noise system's operating time increases, the reflected microwave signal power detected at the klystron port will increase, even with a constant output power. This reduces the high-power microwave isolator's protection effect on the klystron, making arcing more likely. Therefore, this embodiment calculates the ratio between the reflected microwave signal power and the output power to determine the current operating state of the microwave isolator. A larger ratio indicates a larger reflected microwave signal power and a weaker protection effect. Therefore, when this ratio is greater than or equal to a preset threshold, the microwave isolator is considered to be in an abnormal operating state. Since the compensation current value corresponding to bringing the reflected microwave signal power close to 0 cannot be determined at this point, an initial compensation current value is first randomly generated and sent to the compensation module. Then, the real-time reflected microwave signal power is continuously received. Considering that the reflected microwave signal is difficult to reduce to 0, a power threshold with minimal impact on the klystron's operation can be set. If the reflected microwave signal power is still greater than this power threshold, the current compensation current value is adjusted. Based on this, the compensation current value is continuously adjusted until the current reflected microwave signal power is less than or equal to the power threshold. The current compensation current value is then used as the target compensation current value.

[0075] In addition, open-loop mode requires a large amount of data to determine the relationship between temperature information and compensation current value, while closed-loop mode can directly determine the compensation current value based on power data, enabling faster matching between high-power microwave isolators and compensation devices.

[0076] As a preferred embodiment, the compensation module includes a constant current source and a compensation coil disposed in the microwave isolator;

[0077] The step of sending the compensation current value to the compensation module, so that the compensation module generates a magnetic field in the microwave isolator based on the compensation current value, specifically includes:

[0078] The compensation current value is sent to the constant current source so that the constant current source sends a compensation current to the compensation coil based on the compensation current value, so that the compensation coil generates a compensation magnetic field in the microwave isolator.

[0079] As a preferred embodiment, the microwave isolator compensation device includes a compensation trigger module;

[0080] The method further includes:

[0081] When a compensation start signal is received from the compensation trigger module, the compensation process is determined to be started.

[0082] The microwave isolator compensation method provided in this invention can control the compensation module to generate a compensation magnetic field in the microwave isolator according to a preset compensation mode based on the received output power of the klystron, the power of the reflected microwave signal, and the temperature information of the microwave isolator. This ensures that the microwave isolator can always effectively isolate the reflected signal during the nuclear fusion experiment and protect the equipment safety of the klystron.

[0083] To better demonstrate the beneficial effects of the microwave isolator compensation device and method provided in the embodiments of the present invention, a specific embodiment will be described below.

[0084] This embodiment was applied in the 4.6GHz / 6MW low-spurious-wave system of the EAST tokamak device. This system comprises 24 branches, each with a 4.6GHz / 250kW klystron and a high-power microwave isolator. Taking one branch as an example, the 4.6GHz / 250kW klystron outputs high-power microwaves, which are coupled out as a small microwave signal via a directional coupler. This signal is then converted into a voltage signal by a detector and transmitted to the processor. A thermistor is used as the temperature sensor to acquire the cooling water inlet temperature, cooling water outlet temperature, and ambient temperature of the high-power microwave isolator; these three temperature parameters are also transmitted to the processor. The trigger signal is a digital signal that controls the processor's start and stop operation; this signal is active high. When the trigger signal is high, the processor calculates the compensation current based on the set compensation mode, i.e., open-loop or closed-loop mode. This compensation current value is transmitted to a constant current source, which has a current output capability of ±7A. The current output from the constant current source is supplied to the compensation coil on the high-power isolator, thereby stabilizing the performance of the high-power isolator. Temperature information, power data, and output compensation current values ​​can be transmitted to a data server for storage via a network.

[0085] like Figure 4 The figure shows the output power and reflected microwave signal power of the low clutter system in this embodiment during actual operation. As can be seen from the power curve in the figure, after the compensation device of this embodiment is started, the reflected microwave signal power gradually approaches 0, and the effect is significant.

[0086] The above description represents the preferred embodiments of the present invention. It should be noted that those skilled in the art can make various improvements and modifications without departing from the principles of the present invention, and these improvements and modifications are also considered to be within the scope of protection of the present invention.

Claims

1. A microwave isolator compensation device, characterized in that, It includes a compensation module, a processor, a klystron power monitoring module, and several temperature sensors; The input terminal of the klystron power monitoring module is connected to the power output terminal of the klystron to monitor the output power of the klystron and the reflected microwave signal power. The output terminal of the klystron power monitoring module is connected to the input terminal of the processor. The temperature sensor is used to detect the temperature information of the microwave isolator in the low-clutter system, and the output terminal of the temperature sensor is connected to the input terminal of the processor. The processor's output is connected to the compensation module, which is used to generate a compensation magnetic field in the microwave isolator. The processor is used to determine the working state of the microwave isolator based on the comparison result between the ratio between the reflected microwave signal power and the output power and a preset ratio threshold when the compensation mode is closed-loop mode. When the microwave isolator is determined to be in an abnormal operating state, an initial compensation current value is randomly generated. After sending the current compensation current value to the compensation module, the current reflected microwave signal power continues to be received from the klystron power monitoring module. When the current reflected microwave signal power is greater than the preset power threshold, the current compensation current value is adjusted. This step is repeated until the current reflected microwave signal power is less than or equal to the power threshold, and the current compensation current value is taken as the target compensation current value.

2. The microwave isolator compensation device as described in claim 1, characterized in that, The compensation module includes a constant current source and a compensation coil disposed in the microwave isolator; The processor's output terminal is connected to the input terminal of the constant current source, and the constant current source's output terminal is connected to the input terminal of the compensation coil. The compensation coil is used to generate a compensation magnetic field in the microwave isolator.

3. The microwave isolator compensation device as described in claim 1, characterized in that, The klystron power monitoring module includes a directional coupler, a detector, and an isolation amplifier; The input terminal of the directional coupler is connected to the power output terminal of the klystron to monitor the output power and the reflected microwave signal power. The coupling output terminal of the directional coupler is connected to the input terminal of the detector. The output terminal of the detector is connected to the input terminal of the isolation amplifier. The output terminal of the isolation amplifier is connected to the input terminal of the processor.

4. The microwave isolator compensation device as described in claim 1, characterized in that, The device also includes a compensation triggering module; The input terminal of the compensation trigger module is used to receive the trigger signal sent by the master control device in the low clutter system, and the control terminal of the compensation trigger module is connected to the controlled terminal of the processor.

5. The microwave isolator compensation device as described in claim 1, characterized in that, The temperature sensor includes a first temperature sensor for detecting the inlet temperature of the cooling water of the microwave isolator, a second temperature sensor for detecting the outlet temperature of the cooling water of the microwave isolator, and a third temperature sensor for detecting the ambient temperature.

6. A microwave isolator compensation method, executed by a processor in the microwave isolator compensation device according to any one of claims 1 to 5, characterized in that, include: When the compensation process is detected to be started, the output power of the klystron and the reflected microwave signal power are received from the klystron power monitoring module. Temperature information from the microwave isolator is received from several temperature sensors; According to the preset compensation mode, the compensation current value is determined based on the output power, the reflected microwave signal power, or the temperature information. The compensation current value is sent to the compensation module so that the compensation module generates a compensation magnetic field in the microwave isolator based on the compensation current value. Specifically, determining the compensation current value based on the output power, the reflected microwave signal power, or the temperature information according to a preset compensation mode includes: When the compensation mode is closed-loop mode, the working state of the microwave isolator is determined based on the comparison result between the ratio between the reflected microwave signal power and the output power and the preset ratio threshold. When the microwave isolator is determined to be in an abnormal operating state, an initial compensation current value is randomly generated. After sending the current compensation current value to the compensation module, the current reflected microwave signal power continues to be received from the klystron power monitoring module. When the current reflected microwave signal power is greater than the preset power threshold, the current compensation current value is adjusted. This step is repeated until the current reflected microwave signal power is less than or equal to the power threshold, and the current compensation current value is taken as the target compensation current value.

7. The microwave isolator compensation method as described in claim 6, characterized in that, The temperature information includes the cooling water inlet temperature of the microwave isolator, the cooling water outlet temperature of the microwave isolator, and the ambient temperature; The step of determining the compensation current value based on the output power, the reflected microwave signal power, or the temperature information according to a preset compensation mode specifically includes: When the compensation mode is open-loop mode, the compensation current value is determined based on the cooling water inlet temperature, the cooling water outlet temperature, and the ambient temperature using the following expression: ； in, This indicates the value of the compensation current; This indicates the inlet temperature of the cooling water; This indicates the outlet temperature of the cooling water; This indicates the ambient temperature; , , , , and These represent the first preset coefficient, the second preset coefficient, the third preset coefficient, the fourth preset coefficient, the fifth preset coefficient, and the sixth preset coefficient, respectively.

8. The microwave isolator compensation method as described in claim 6, characterized in that, The compensation module includes a constant current source and a compensation coil disposed in the microwave isolator; The step of sending the compensation current value to the compensation module, so that the compensation module generates a magnetic field in the microwave isolator based on the compensation current value, specifically includes: The compensation current value is sent to the constant current source so that the constant current source sends a compensation current to the compensation coil based on the compensation current value, so that the compensation coil generates a compensation magnetic field in the microwave isolator.

9. The microwave isolator compensation method as described in claim 6, characterized in that, The microwave isolator compensation device includes a compensation trigger module; The method further includes: When a compensation start signal is received from the compensation trigger module, the compensation process is determined to be started.

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