Method and system for fast voltage regulation of gyrotron based on long pulse power forbidden zone prediction

Abstract

The application provides a gyrotron fast voltage regulating method based on long pulse power forbidden zone prediction, belongs to the field of nuclear fusion plasma heating, and comprises the following steps: setting a target power, determining the adjustment range of the anode voltage of the gyrotron based on the target power; starting the gyrotron until the power of the gyrotron reaches a safe advance point, the safe advance point is located before the starting boundary of the power forbidden zone, and the anode voltage of the gyrotron is adjusted to the target voltage at one time according to the adjustment range; under the target voltage, the power of the gyrotron rapidly climbs to the target power after crossing the power forbidden zone and enters long pulse steady-state operation; and the system is also provided; the power forbidden zone and the safe advance point of long pulse operation are identified through statistical analysis, the anode voltage is adjusted at one time predictively when the starting process reaches the safe advance point, the power forbidden zone is quickly regulated after the voltage of the gyrotron is raised, and the gyrotron directly reaches the target power stable region, so that the long pulse starting success rate is significantly improved, the failure risk is reduced, and the starting time is shortened.

Description

Technical Field

[0001] This invention relates to the field of nuclear fusion plasma heating technology, and in particular to a method and system for rapid voltage regulation of gyrotrons based on long-pulse power exclusion prediction. Background Technology

[0002] As the core microwave source of the ECRH system in a large tokamak device, the gyrotron needs to achieve stable operation with long pulses at the megawatt level. In practical applications, the operating target is usually set to a specific power level (e.g., 800kW-1000kW) and a long pulse duration (typically >100s) to meet the plasma heating requirements. The startup process requires a steady climb from low power to the target power and stable operation at the target power level for the set duration.

[0003] However, statistical analysis of actual operating data from the CRAFT device's 170GHz gyrotron 173mm long pulse (pulse width > 100s) revealed that the success rate for long pulse operation in the 600kW-800kW power range was only 23.1% (6 / 26), significantly lower than other power ranges. Specifically, the success rate was 8.3% (1 / 12) in the 600kW-700kW range and 35.7% (5 / 14) in the 700kW-800kW range, forming a significant long pulse power no-go zone. Of the 48 failure cases, 20 (41.7%) were concentrated in the 600kW-800kW range, becoming the main cause of long pulse operation failures. In contrast, the success rate was as high as 86.8% (66 / 76) in the 900kW-1000kW range, and 95.0% (19 / 20) for power outputs above 1000kW, demonstrating good long pulse operation stability.

[0004] Traditional startup methods employ a linear, slow voltage ramp-up strategy, increasing the anode voltage at a constant rate from low power until the target power is reached. This method has two fatal flaws: First, it fails to identify the stability differences between different power ranges during long-pulse operation, applying a uniform control strategy to all power ranges; second, during the ramp-up from low power to the target power (e.g., 800kW-1000kW), it inevitably passes through the 600kW-800kW power restricted zone, where it remains for 30-50 seconds, significantly increasing the risk of instability phenomena such as trigger mode competition and cavity discharge. This results in low startup success rate, high failure rate, and long startup time for long-pulse startups with target power ≥800kW, severely impacting the operating efficiency and reliability of the ECRH system. Therefore, there is an urgent need for a gyrotron startup control method that can identify long-pulse power restricted zones, proactively adjust the anode voltage in advance, and rapidly regulate the voltage in dangerous ranges. Summary of the Invention

[0005] The technical problem to be solved by this invention is: how to solve the problem that existing gyrotron start-up control methods fail to identify the stability differences of different power ranges during long pulse operation, resulting in low start-up success rate and long start-up time for long pulses.

[0006] The present invention solves the above-mentioned technical problems through the following technical solution: a rapid voltage regulation method for gyrotrons based on long-pulse power restricted area prediction, comprising: setting a target power, determining the adjustment range of the gyrotron anode voltage based on the target power; starting the gyrotron until the power of the gyrotron reaches a safe advance point, which is located before the starting boundary of the power restricted area, and adjusting the anode voltage of the gyrotron to the target voltage in one go according to the adjustment range; under the target voltage, the power of the gyrotron rapidly crosses the power restricted area and climbs to the target power, and enters long-pulse steady-state operation.

[0007] This invention identifies the power restricted area and safety advance point of long pulse operation through statistical analysis. When the safety advance point is reached during the startup process, the anode voltage is adjusted in a one-time prediction, so that the gyrotube can quickly adjust the power restricted area after voltage boosting and directly reach the target power stability area. This significantly improves the success rate of long pulse startup, reduces the risk of failure, and shortens the startup time.

[0008] Preferably, determining the adjustment range of the gyrotron anode voltage based on the target power means:

[0009] when hour, ;when hour, ;when hour, ;when hour, ;

[0010] in, Target power, in kW. This refers to the adjustment range of the gyrotron anode voltage. The unit is kV.

[0011] Preferably, the safe lead point refers to the power of the gyrotron. satisfy: The power restricted area refers to the power limit of the gyrotron. satisfy: .

[0012] Preferably, the power restricted area refers to the power range through which the gyrotron operates. The success rate is low.

[0013] Preferably, adjusting the anode voltage of the gyrotron to the target voltage in one go means that the anode voltage is adjusted only once in a startup shot and is not changed after adjustment. The gyrotron relies on the adjusted anode voltage level to allow the power to naturally climb to the target power and operate stably.

[0014] Preferably, the target voltage is:

[0015] when hour, ;when hour, ;when hour, ;when hour, ;

[0016] in, Target power, in kW. The target voltage is expressed in kV.

[0017] Preferably, the rapid power passage of the gyrotron through the power restricted zone means that the gyrotron operates within the power restricted zone for a short period of time.

[0018] Preferably, the time the gyrotron operates in the power-forbidden zone satisfy: .

[0019] Preferably, when the target power is greater than or equal to 1000kW, the time the gyrotron operates in the power restricted zone is... satisfy: .

[0020] This invention also provides a gyrotron rapid voltage regulation system based on long-pulse power exclusion prediction, comprising:

[0021] The target setting module is used to set the target power and determine the adjustment range of the gyrotron anode voltage based on the target power;

[0022] The predictive anode voltage adjustment module is used to start the gyrotron until the power of the gyrotron reaches the safe advance point, which is located before the starting boundary of the power restricted area. The anode voltage of the gyrotron is adjusted to the target voltage in one go according to the adjustment range. Under the target voltage, the power of the gyrotron quickly crosses the power restricted area and climbs to the target power, and enters long pulse steady state operation.

[0023] The advantages provided by this invention are:

[0024] 1. This invention, through predictive adjustment of the anode voltage and rapid voltage regulation within the 600kW-800kW power restricted zone, increases the success rate of long pulses (>100s) in this range from 23.1% to over 90%. The overall long pulse start-up success rate increases from 72.3% to over 95%, and the number of failure cases decreases from 48 to less than 8. Among these, the number of failures due to the 600kW-800kW range decreases from 20 to less than 2, a reduction of 90%, significantly improving the long pulse start-up success rate.

[0025] 2. Traditional methods result in a dwell time of 30-50 seconds in the 600kW-800kW range. This invention, through rapid voltage regulation, shortens this dwell time to 7-10 seconds, a reduction of approximately 80%, significantly reducing the time spent in the power restricted area and greatly lowering the risk of triggering instability. For startups with a target power ≥1000kW, the voltage regulation time can be further reduced to less than 5 seconds.

[0026] 3. This invention employs a predictive, one-time adjustment strategy, avoiding the complex operation of repeatedly adjusting the anode voltage during operation. Operators only need to determine the adjustment range based on the target power before startup, and perform an adjustment once when the power reaches 550kW-600kW. The entire startup process is clear, straightforward, and easily standardized and automated.

[0027] 4. This invention strictly controls the anode voltage adjustment range within 0.5-2.6kV, ensuring that a single adjustment does not exceed the equipment's safety limits, thus avoiding overcurrent protection triggering that may be caused by a large one-time adjustment (>2kV). The segmented strategy table provides clear adjustment guidance for different target power levels, ensuring adjustment safety.

[0028] 5. This invention is applicable to long-pulse (pulse width > 100s) start-up control of megawatt-level (0.5MW-2MW) gyrotrons, and is particularly suitable for operating scenarios with a target power ≥ 800kW. It has been successfully applied to the 170GHz / 1MW gyrotron of the CRAFT device, and theoretically can be extended to the ECRH system of other tokamak devices such as ITER and BEST, as well as other microwave source devices that require high-power long-pulse operation, demonstrating good engineering practicality and scalability. Attached Figure Description

[0029] Figure 1 This is a flowchart of the gyrotron rapid voltage regulation method based on long pulse power exclusion prediction provided in Embodiment 1 of the present invention;

[0030] Figure 2 This is a schematic diagram comparing the power and time relationship between the gyrotron rapid voltage regulation method based on long pulse power restricted area prediction provided in Embodiment 1 of the present invention and the traditional method;

[0031] Figure 3This is a schematic diagram of a gyrotube rapid voltage regulation system based on long pulse power restricted area prediction provided in Embodiment 2 of the present invention. Detailed Implementation

[0032] To make the objectives, technical solutions, and advantages of this invention clearer, the technical solutions of this invention will be clearly and completely described below in conjunction with specific embodiments and with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this invention. All other embodiments obtained by those skilled in the art based on the embodiments of this invention without creative effort are within the scope of protection of this invention.

[0033] Example 1

[0034] like Figure 1 As shown, this embodiment provides a rapid voltage regulation method for gyrotrons based on long-pulse power exclusion prediction, including the following steps:

[0035] Step 1: Set the target power Based on target power Determine the adjustment range of the gyrotron anode voltage. :when hour, ;when hour, ;when hour, ;when hour, ;in, Target power, in kW. This refers to the adjustment range of the gyrotron anode voltage. The unit is kV.

[0036] Step 2: Start the gyrotron until its power reaches the safe lead point. The safe lead point is located before the starting boundary of the power exclusion zone. The safe lead point refers to the power of the gyrotron. satisfy: The power restricted area refers to the power limit of the gyrotron. satisfy: The power restricted area refers to the power range that the gyrotron passes through during operation. The success rate is low.

[0037] This invention, based on a systematic analysis of actual operating data of the 170GHz gyrotron 173mm long pulse (pulse width > 100s) of the CRAFT ECRH system, quantitatively identifies for the first time the power restricted areas for long pulse operation of the gyrotron. Statistical results show that the 600kW-800kW power range exhibits extremely low success rates under long pulse operation conditions. Specifically, the success rate in the 600kW-700kW range is only 8.3% (1 / 12), the success rate in the 700kW-800kW range is 35.7% (5 / 14), and the overall success rate in the 600kW-800kW range is 23.1% (6 / 26), far lower than adjacent power ranges. In contrast, the 550kW-600kW range, despite having less data, showed a 100% success rate (5 / 5), making it a safe point for early adjustment. The success rate significantly increased in the power range above 800kW, reaching 68.9% (31 / 45) in the 800kW-900kW range, 86.8% (66 / 76) in the 900kW-1000kW range, and a high 95.0% (19 / 20) in the range above 1000kW. This significant "V-shaped" distribution of success rates indicates that the 600kW-800kW range is a power restricted area for long-pulse operation, unsuitable for prolonged stays or stable operation, and necessitates a rapid voltage regulation strategy.

[0038] Based on the power restricted area identification results, this invention determines 550kW-600kW as the safe advance point for predictive anode voltage adjustment. The criteria for selecting this range as the advance point include: First, this range exhibits a 100% success rate (5 / 5) during long-pulse operation, proving that anode voltage adjustment at this power level is safe and reliable; second, this range is located before the starting boundary of the power restricted area (600kW-800kW), leaving sufficient safety margin; third, after a one-time anode voltage adjustment from this power point, the gyrotron has ample power ramp-up space to directly reach the stable operating range above 800kW, avoiding prolonged stay within the restricted area. Actual operating data verification shows that when anode voltage adjustment is performed in the 550kW-600kW range, the subsequent power ramp-up process is stable and controllable, without any abnormal phenomena such as overcurrent or discharge, verifying the rationality of this advance point selection.

[0039] The anode voltage of the gyrotron is adjusted to the target voltage in one step according to the adjustment range:

[0040] when hour, ;when hour, ;when hour, ;when hour, ;in, Target power, in kW. The target voltage is expressed in kV.

[0041] Before starting step 1, this invention predicts the target power. When the target power is ≥800kW, a one-time anode voltage adjustment is performed when the power reaches the safe lead point of 550kW-600kW. The adjustment range is determined according to the target power: when the target power is 800kW-850kW, the anode voltage is adjusted by +(0.5kV-0.7kV); when the target power is 850kW-900kW, the adjustment is +(0.7kV-1.0kV); when the target power is 900-950kW, the adjustment is +(1.0kV-1.3kV); and when the target power is greater than 1000kW, the adjustment is +(1.3kV-2.6kV). The adjustment range was chosen based on statistical analysis of successful long-pulse cases: the average anode voltage for successful cases of 800kW-850kW was 24.54kV, for 850kW-900kW it was 25.01kV, for 900kW-950kW it was 25.88kV, for 950kW-1000kW it was 26.25kV, and for cases greater than 1000kW it was 26.63kV. Considering that the anode voltage is approximately 22kV-24kV at 550kW-600kW, a single adjustment can bring the anode voltage to the optimal value corresponding to the target power, thus enabling rapid power ramp-up after adjustment. The key feature is "one-time" adjustment, meaning that the anode voltage is adjusted only once in a single start-up shot and remains unchanged afterward. The gyrotron relies on the adjusted anode voltage level to allow the power to naturally ramp up to the target value and operate stably, avoiding the instability and complexity that may result from multiple adjustments.

[0042] Under the target voltage, the gyrotron's power rapidly crosses the power limit and climbs to the target power, then enters a long-pulse steady-state operation. The rapid power crossing of the gyrotron means that the gyrotron operates within the power limit for a short period. The time the gyrotron operates within the power limit... satisfy: When the target power is greater than or equal to 1000kW, the time the gyrotron operates within the power limit zone. satisfy: .

[0043] After a one-time anode voltage adjustment at the 550kW-600kW safety lead point, the gyrotron's output power rapidly climbs under the drive of the high anode voltage, quickly passing through the 600kW-800kW power restriction zone from 600kW to reach the stable zone above 800kW. Taking a target of 900kW as an example, by increasing the anode voltage from approximately 23kV to 25.5kV (+2.5kV) in one go at 550kW-600kW, the power rapidly climbs from 600kW to 820kW within 5-10 seconds, with the voltage regulation restriction zone time being only 7-10 seconds, a reduction of 70-80% compared to the 30-50 seconds of the traditional method. The key to rapid voltage regulation lies in the strong power driving force provided by the large anode voltage adjustment, enabling the gyrotron to maintain a rapid upward trend within the power restriction zone, minimizing the exposure time in this range, and thus effectively avoiding unstable phenomena such as trigger mode competition and discharge. After successful voltage regulation, the gyrotube enters long-pulse steady-state operation in the stable region above 800kW. The anode voltage remains unchanged, and the power fluctuates slightly around the target value. The remaining time of the entire shot (usually >100s) is completed in a stable state, achieving high-quality long-pulse operation.

[0044] This invention identifies the power restricted area (600-800kW, success rate 23.1%) and safety advance point (550-600kW, success rate 100%) for long pulse operation through statistical analysis. When the safety advance point is reached during the startup process, the anode voltage is preemptively adjusted once (0.5kV-1.5kV), enabling the gyrotube to quickly adjust the power restricted area (<10 seconds) after voltage boosting, directly reaching the target power stable area (>800kW, success rate >85%). This significantly improves the success rate of long pulse startup, reduces the risk of failure, and shortens the startup time.

[0045] Compared with the prior art, the present invention has the following significant advantages:

[0046] (1) The success rate of long pulse start-up is significantly improved. This invention improves the success rate of long pulse (>100s) start-up in the 600kW-800kW power restricted area by predictively adjusting the anode voltage in advance and rapidly regulating the voltage. The success rate of long pulse start-up in this range is increased from 23.1% to over 90%. The overall success rate of long pulse start-up is increased from 72.3% to over 95%, and the number of failure cases is reduced from 48 to less than 8. Among them, the number of failure cases due to the 600kW-800kW range is reduced from 20 to less than 2, a reduction of 90%.

[0047] (2) The dwell time in the power restricted area is significantly shortened. Traditional methods result in a dwell time of 30-50 seconds in the 600kW-800kW range. This invention shortens the dwell time to 7-10 seconds through rapid voltage regulation, a reduction of approximately 80%, which greatly reduces the risk of triggering instability. For startups with a target power ≥1000kW, the voltage regulation time can be further shortened to less than 5 seconds.

[0048] (3) The startup process is simple and reliable. The present invention adopts a predictive one-time adjustment strategy, which avoids the complex operation of repeatedly adjusting the anode voltage during operation. The operator only needs to determine the adjustment range according to the target power before startup, and perform an adjustment once when the power reaches 550kW-600kW. The entire startup process is clear and easy to standardize and automate.

[0049] (4) Avoid overcurrent risk. The anode voltage adjustment range is strictly controlled within the range of 0.5-2.6kV, and a single adjustment does not exceed the equipment safety limit, avoiding the overcurrent protection triggering that may be caused by a large adjustment at once (>2kV). The segmented strategy table provides clear adjustment guidance for different target power, ensuring adjustment safety.

[0050] (5) Data-driven and highly reliable. This invention is based on statistical analysis of actual operating data of 173 long pulses. The data source is the actual operating data of the 170GHz / 1MW gyrotron of the CRAFT ECRH system from October 2024 to January 2025. The total data is 1216 shots, of which 173 shots are long pulse (pulse width > 100s), with 125 successful shots and 48 failed shots. 26 shots are long pulse data in the power restricted area (600kW-800kW), with 6 successful shots and 20 failed shots. One shot refers to one output of the gyrotron. All data are from actual operating conditions. The parameter measurement accuracy is: power ±2%, voltage ±0.1kV, current ±0.1A, time ±0.1s. The identification of the power restricted area, the determination of the safety advance point, and the recommendation of the adjustment range are all supported by sufficient data.

[0051] The method demonstrated stability in subsequent verifications. For long-pulse startup with a target power ≥800kW, the adoption of a predictive rapid voltage regulation strategy increased the startup success rate from 72.3% to 96.7% (29 / 30), and the success rate in the 600kW-800kW restricted area increased from 23.1% to 93.3% (28 / 30). The average dwell time in the restricted area was reduced from 38 seconds to 8 seconds, a decrease of 79%. Failure case analysis showed that after adopting the method of this invention, the failure rate caused by the 600kW-800kW range decreased from 41.7% to 6.7%, a reduction of 84%.

[0052] This invention is applicable to long-pulse (pulse width > 100s) start-up control of megawatt-level (0.5MW-2MW) gyrotrons, and is particularly suitable for operating scenarios with a target power ≥ 800kW. It has been successfully applied to the 170GHz / 1MW gyrotron of the CRAFT device, and theoretically can be extended to the ECRH system of other tokamak devices such as ITER and BEST, as well as other microwave source devices that require high-power long-pulse operation, demonstrating good engineering practicality and scalability.

[0053] Example 2

[0054] See Figure 3 This embodiment provides a gyrotron rapid voltage regulation system based on long-pulse power exclusion prediction, including:

[0055] The target setting module is used to set the target power and determine the adjustment range of the gyrotron anode voltage based on the target power; determining the adjustment range of the gyrotron anode voltage based on the target power means:

[0056] when hour, ;when hour, ;when hour, ;when hour, ;

[0057] in, Target power, in kW. This refers to the adjustment range of the gyrotron anode voltage. The unit is kV.

[0058] The predictive anode voltage adjustment module is used to start the gyrotron until the power of the gyrotron reaches the safe advance point, which is located before the starting boundary of the power restricted area. The anode voltage of the gyrotron is adjusted to the target voltage in one go according to the adjustment range. Under the target voltage, the power of the gyrotron quickly crosses the power restricted area and climbs to the target power, and enters long pulse steady state operation.

[0059] Among them, the safety lead point refers to the power of the gyrotron. satisfy: The power restricted area refers to the power limit of the gyrotron. satisfy: The power restricted area refers to the power range that the gyrotron passes through during operation. The success rate is low.

[0060] Adjusting the anode voltage of the gyrotron to the target voltage in one go means that the anode voltage is adjusted only once during a startup shot and then remains unchanged. The gyrotron relies on the adjusted anode voltage level to allow the power to naturally climb to the target power and operate stably.

[0061] The target voltage is: when hour, ;when hour, ;when hour, ;when hour, ;in, Target power, in kW. The target voltage is expressed in kV.

[0062] The rapid power crossing of a gyrotron through the power-forbidden zone refers to the short time the gyrotron spends within this zone. satisfy: When the target power is greater than or equal to 1000kW, the time the gyrotron operates within the power limit zone. satisfy: .

[0063] Experimental verification

[0064] This embodiment takes a target power of 900kW as an example to introduce the gyrotron rapid voltage regulation method based on long pulse power exclusion prediction in Embodiment 1:

[0065] Step 1: Setting the Operating Target: Set the gyrotron's operating target to an output power of 900kW and a duration of 1000 seconds (long pulse). Based on the predictive anode voltage adjustment strategy based on target power in Table 1, refer to the segmented strategy table to determine: target 900kW-950kW, safe lead point 550kW-600kW, recommended anode voltage adjustment range of +(1.0kV-1.3kV), and the adjusted anode voltage should reach 25.5kV-26.0kV.

[0066] Table 1. Predictive Anode Voltage Adjustment Strategy Based on Target Power

[0067]

[0068] This invention provides the aforementioned predictive anode voltage adjustment strategy based on different target power levels. All strategies in Table 1 are triggered at a safe lead point of 550kW-600kW and remain unchanged after a one-time anode voltage adjustment. The adjustment range is selected based on the target power to ensure rapid voltage regulation to the 600kW-800kW restricted area and reach the target power after adjustment. The safety rating is based on the adjustment range and verification data. Indicates high security. Indicates safety. This indicates that caution is needed (as it approaches the upper limit for a single adjustment).

[0069] Step 2: Start the gyrotron according to the standard procedure. The initial anode voltage is set to 23kV. The cathode filament is preheated, and the magnetic field is established and stabilized. After startup, the output power slowly increases from 200kW, using the normal boost mode, with the anode voltage increasing at a rate of +0.2kV every 5 seconds. At the 10th second, the power reaches 500kW, and the anode voltage is 23.4kV; at the 15th second, the power reaches 580kW, and the anode voltage is 23.6kV, approaching the safe advance trigger condition. The 0-15 second phase is the startup and ramp-up phase.

[0070] At the 15-second mark, the power monitoring system detected that the output power reached 590kW, entering the 550kW-600kW safe lead point range. The control system immediately executed a preset one-time anode voltage adjustment: the anode voltage was increased from 23.6kV to 25.6kV, an adjustment range of +2.0kV (within the upper limit of the recommended 1.0kV-2.3kV range, a larger adjustment was adopted considering the target power is close to 950kW). The adjustment process was smooth, without triggering any overcurrent or overvoltage protection. The 15-16 second period is the predictive anode voltage adjustment phase.

[0071] After the anode voltage was adjusted, the gyrotron output power rapidly increased under high voltage drive. At 17 seconds, the power reached 640kW, entering the 600kW-800kW power restricted zone; at 19 seconds, the power reached 720kW; at 21 seconds, the power reached 790kW; and at 23 seconds, the power reached 850kW, successfully entering the voltage regulation power restricted zone. The entire voltage regulation process lasted 7 seconds (16-23 seconds), with 16-23 seconds being the rapid voltage regulation phase. The actual dwell time within the restricted zone was only 6 seconds (17-23 seconds), far less than the 30-50 seconds of traditional methods. No mode competition, discharge, or other instability phenomena occurred during the rapid voltage regulation period.

[0072] After 23 seconds, the gyrotron entered a stable operating range above 800kW. The power continued to slowly climb, reaching 910kW at 30 seconds and 920kW at 35 seconds, then fluctuating slightly within the 915kW-925kW range before successfully stabilizing near the target 900kW. The anode voltage remained constant at 25.6kV without any adjustment. The cathode current stabilized at around 43.5A, the collector current was normal, and all operating parameters were within safe limits. The gyrotron continued operating in this stable state for 1000 seconds, completing the long-pulse operation task, and the shot was successfully terminated. The period from 23 to 1000 seconds represents the steady-state operation phase of the gyrotron.

[0073] The above experiments show that the total startup time to reach the target power was 23 seconds, with a stay in the 600kW-800kW restricted area of ​​only 7 seconds, achieving a 100% success rate. Under the same conditions, the traditional method takes an average of 60 seconds, with a 40-second stay in the restricted area, and a success rate of approximately 60%. This invention reduces startup time by 62%, reduces restricted area exposure time by 85%, and increases the success rate by 40 percentage points. The anode voltage is adjusted only once, making the operation simple and straightforward, fully validating the effectiveness and reliability of the predictive rapid voltage regulation strategy.

[0074] The above embodiments are only used to illustrate the technical solutions of the present invention, and are not intended to limit it. Although the present invention has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. A gyrotron fast voltage regulation method based on long-pulse power forbidden zone prediction, characterized in that: Comprising: Setting a target power, determining an adjustment range of the gyrotron anode voltage based on the target power: when , ; when , ; when , ; when , ; wherein, is the target power, in kW, is the adjustment range of the gyrotron anode voltage, , in kV; The gyrotron is started until the power of the gyrotron reaches a safe advance point, the safe advance point refers to the power of the gyrotron satisfies: , the power forbidden zone refers to the power of the gyrotron satisfies: , the safe advance point is located before the starting boundary of the power forbidden zone, the anode voltage of the gyrotron is adjusted to the target voltage at one time according to the adjustment amplitude: When , ; when , ; when , ; when , ; is the target voltage in kV; The power of the gyrotron rapidly crosses the power forbidden zone and climbs to the target power under the target voltage, and enters the long pulse steady state operation.

2. The gyrotron fast voltage regulation method based on long-pulse power forbidden zone pre-judgment according to claim 1, characterized in that: The power forbidden zone refers to the power interval through which the gyrotron operates with low success rate .

3. The method of claim 1, wherein the method is based on long-pulse power forbidden zone pre-judgment. The one-time adjustment of the anode voltage of the gyrotron to the target voltage refers to that the anode voltage is adjusted only once in a start shot, and is not changed after adjustment, and the gyrotron relies on the adjusted anode voltage level to naturally climb to the target power and stably operate.

4. The method of claim 1, wherein the method is based on long-pulse power forbidden zone pre-judgment. The power of the gyrotron rapidly crosses the power forbidden zone refers to that the gyrotron runs in the power forbidden zone for a short time.

5. The gyrotron fast voltage regulation method based on long-pulse power forbidden zone pre-judgment according to claim 4, characterized in that: Time of operation of a gyrotron in the power forbidden zone satisfies: .

6. The gyrotron fast voltage regulation method based on long-pulse power forbidden zone pre-judgment according to claim 4, characterized in that: Time when the gyrotron operates in the power forbidden zone when the target power is greater than or equal to 1000 kW satisfies: .

7. The gyrotron fast voltage regulating system based on long pulse power forbidden zone prediction, characterized in that: Comprising: The target setting module is used to set the target power and determine the adjustment range of the gyrotron anode voltage based on the target power: when hour, ;when hour, ;when hour, ;when hour, ;in, Target power, in kW. This refers to the adjustment range of the gyrotron anode voltage. The unit is kV; The pre-judgment anode voltage adjustment module is used for starting the gyrotron until the power of the gyrotron reaches a safe advance point, the safe advance point refers to the power of the gyrotron satisfies: , the power forbidden zone refers to the power of the gyrotron satisfies: , the safe advance point is located before the starting boundary of the power forbidden zone, and the anode voltage of the gyrotron is adjusted to a target voltage at one time according to an adjustment amplitude; when , ; when , ; when , ; when , ; is the target voltage, and the unit is kV; under the target voltage, the power of the gyrotron rapidly climbs to a target power after crossing the power forbidden zone and enters long-pulse steady-state operation.

8. The gyrotron fast voltage regulating system based on long-pulse power forbidden zone pre-judging of claim 7, wherein: The power forbidden zone refers to the power interval through which the gyrotron operates with low success rate .

9. The gyrotron fast voltage regulating system based on long-pulse power forbidden zone pre-judging of claim 7, wherein: The one-time adjustment of the anode voltage of the gyrotron to the target voltage refers to that the anode voltage is adjusted only once in a start shot, and is not changed after adjustment, and the gyrotron relies on the adjusted anode voltage level to naturally climb to the target power and stably operate.

10. The gyrotron fast voltage regulating system based on long-pulse power forbidden zone pre-judging of claim 7, wherein: The power of the gyrotron rapidly crosses the power forbidden zone refers to that the gyrotron runs in the power forbidden zone for a short time.

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