A method and device for measuring superconducting high-frequency cavity field emission radiation based on scintillating fibers

Abstract

The application discloses a kind of based on scintillation fiber's superconducting high-frequency cavity field emission radiation measurement method and device, comprising: scintillation fiber grid includes inner layer scintillation fiber grid and outer layer scintillation fiber grid, arrangement in superconducting high-frequency cavity outer wall, for converting radiation particle into scintillation light signal;Transmission optical fiber is used to transmit scintillation light signal to photoelectric detection module;Photoelectric detection module is used to convert digital pulse signal and store scintillation light signal;Dewar structure is used to accommodate superconducting high-frequency cavity and provide cryogenic test environment;Analysis module is used to obtain the energy spectrum characteristics of field emission radiation, radiation spatial distribution and radiation dynamic change trend according to digital pulse signal.The application has the characteristics of high sensitivity, anti-radiation, strong anti-interference ability, flexible layout, can effectively solve the technical problems that prior art cannot accurately measure and diagnose field emission radiation in low-temperature strong field environment, has wide application prospect and engineering practical value.

Description

Technical Field

[0001] This invention belongs to the field of radiation measurement technology, and particularly relates to a method and device for measuring superconducting high-frequency cavity field emission radiation based on scintillation fiber. Background Technology

[0002] Superconducting high-frequency cavities possess advantages such as a high acceleration gradient during continuous wave operation, a large beam aperture resulting in good beam performance, stable operation, and low high-frequency power requirements. Vertical testing, which involves performance testing of superconducting cavities not installed in modules, is a crucial method for evaluating cavity fabrication processes, surface treatment processes, and acceleration performance. During cryogenic testing, areas with microscopic defects on the cavity surface are prone to field emission under a strong electric field. This primarily manifests as electrons being pulled out of the cavity wall's metal surface by the strong electric field. This process generates X-ray radiation, posing a safety hazard to personnel. When photon energy is high, it can also generate neutrons through photonuclear reactions, causing activation of surrounding materials. Simultaneously, electron collisions with the cavity wall generate heat, leading to quench loss. More seriously, long-term electron bombardment can damage the cavity wall and reduce cavity performance.

[0003] Traditional radiation monitoring methods, such as gas detectors and semiconductor detectors, suffer from limited spatial coverage, making multi-point distribution difficult. They are also significantly affected by electromagnetic interference, unable to operate stably for extended periods under low temperatures or strong magnetic fields, and are relatively expensive. Therefore, there is an urgent need for a highly sensitive, interference-resistant, distributed radiation measurement system with wide-area coverage capabilities. Summary of the Invention

[0004] To address the aforementioned technical problems, this invention proposes a method and apparatus for measuring superconducting high-frequency cavity field-induced emission radiation based on scintillation fiber, thereby resolving the issues present in the prior art.

[0005] To achieve the above objectives, the present invention provides a method for measuring superconducting high-frequency cavity field-induced emission radiation based on scintillation fiber, comprising: Field emission electrons bombard the walls of a superconducting high-frequency cavity to generate secondary particles. The scintillation light excited by these secondary particles is captured by a scintillation fiber grid arranged around the outer periphery of the superconducting high-frequency cavity, thus obtaining a scintillation light signal. A digital pulse signal is obtained based on the flickering light signal; The digital pulse signal is subjected to energy spectrum analysis, spatial three-dimensional reconstruction, and time correlation analysis, which output the energy spectrum, spatial distribution, and evolution trend information of field emission electrons, respectively. The digital signal is subjected to energy spectrum analysis, spatial three-dimensional reconstruction and time correlation analysis in sequence, and the energy spectrum characteristics, spatial distribution and dynamic trend of field emission radiation are output to realize the measurement of superconducting high-frequency cavity field emission radiation.

[0006] Optionally, the process of obtaining a digital pulse signal based on the flickering light signal includes: The flashing light signal is converted into an electrical pulse signal proportional to the light intensity by a photoelectric converter; the electrical pulse signal is amplified by a low-noise preamplifier and noise is suppressed by a shaping and filtering circuit; the processed signal is digitally sampled by a high-speed analog-to-digital converter and time-marked with high precision by a time stamping unit to obtain a digital pulse signal.

[0007] Optionally, based on the timing and signal strength distribution of the dual-layer fiber optic network mesh triggering, the location of the field-induced emission hotspot is reconstructed in three dimensions to obtain the radiation spatial distribution.

[0008] The present invention also provides a superconducting high-frequency cavity field emission radiation measurement device based on scintillation fiber, for implementing the above-mentioned superconducting high-frequency cavity field emission radiation measurement method based on scintillation fiber, comprising: Scintillation fiber optic mesh, transmission fiber optic cable, photoelectric detection module, Dewar structure and analysis module; The scintillation fiber grid includes an inner scintillation fiber grid and an outer scintillation fiber grid, which are arranged on the outer wall of the superconducting high-frequency cavity to convert radiation particles into scintillation light signals. The transmission optical fiber is used to transmit the scintillation signal to the photoelectric detection module; The photoelectric detection module is used to convert the flashing light signal into a digital pulse signal and store it; The Dewar structure is used to house the superconducting high-frequency cavity and provide a low-temperature testing environment; The analysis module is used to obtain the energy spectrum characteristics, spatial distribution, and dynamic trend of field emission radiation based on the digital pulse signal.

[0009] Optionally, the inner scintillation fiber grid is arranged close to the outer surface of the cavity, and the outer scintillation fiber grid is arranged around the outer side of the inner scintillation fiber grid, with a gap between the two grids; both the inner and outer scintillation fiber grids are composed of vertical and horizontal scintillation fibers, which are equidistantly distributed; the spacing of the scintillation fibers is determined according to the cavity size and detection resolution requirements.

[0010] Optionally, the Dewar structure includes a Dewar canister and a Dewar cover; the inner scintillation fiber optic mesh and the outer scintillation fiber optic mesh are connected to the corresponding transmission fiber, and the transmission fiber passes through the Dewar cover and is connected to the photoelectric detection module.

[0011] Optionally, the photoelectric detection module includes a photodetector, a preamplifier unit, a signal filter, an analog-to-digital converter, a time stamp unit, and a data storage unit; A photodetector is used to convert optical signals into electrical signals; A preamplifier unit is used to amplify the electrical signal with low noise. Signal filters are used to remove noise and retain the target pulse signal frequency band. An analog-to-digital converter is used to accurately sample analog voltage pulses and convert them into digital pulse signals. The time stamp unit is used to mark the arrival time of each digital pulse signal; Data storage unit, used to store the marked digital pulse signal.

[0012] Optionally, the device may further include an external shield that surrounds the entire Dewar structure to shield against radiation generated by field emission electrons.

[0013] Compared with the prior art, the present invention has the following advantages and technical effects: This invention employs plastic scintillation fiber as the core detection element, which possesses advantages such as high mechanical flexibility, low-temperature resistance, and radiation resistance, enabling it to operate normally in extreme environments. The scintillation fiber converts incoming ionizing radiation into visible light signals. It can be wound or adhered to the cavity surface, achieving large-area, high-density coverage, suitable for radiation monitoring of complex geometries. Optical signals are generated through the interaction of X-rays or secondary electrons produced by field emission electrons with the scintillation material, and transmitted using ordinary transmission optical fibers. Signal acquisition and processing are performed via a remote photoelectric detection module and computer system, avoiding interference from the strong electromagnetic field of the high-frequency cavity on the electronic system. This invention addresses several technical bottlenecks in existing measurement technologies operating in superconducting high-frequency cavities, particularly the challenges of adapting to and maintaining long-term stable operation of traditional detectors under complex conditions such as low temperatures, high electromagnetic field interference, strong radiation, and limited space.

[0014] This invention utilizes an inner and outer two-layer scintillation fiber optic mesh system to perform real-time monitoring and imaging of the radiation field surrounding the cavity, and can accurately analyze high-intensity signal points, providing field emission diagnostic capabilities. Furthermore, its modular design facilitates integration, maintenance, and expansion, making it suitable for different types of superconducting high-frequency cavity systems.

[0015] This invention features high sensitivity, strong radiation resistance, strong anti-interference capability, and flexible deployment. It can effectively solve the technical problem that existing technologies cannot accurately measure and diagnose field emission radiation in low-temperature, strong-field environments, and has broad application prospects and practical engineering value. Attached Figure Description

[0016] The accompanying drawings, which form part of this application, are used to provide a further understanding of this application. The illustrative embodiments and descriptions of this application are used to explain this application and do not constitute an undue limitation of this application. In the drawings: Figure 1 This is a structural block diagram of the radiation measurement process according to an embodiment of the present invention; Figure 2 This is a schematic diagram of a low-temperature testing and radiation measurement system according to an embodiment of the present invention; Figure 3 This is a schematic diagram of the inner scintillation fiber optic mesh measurement system according to an embodiment of the present invention; Figure 4 This is a schematic diagram of the outer scintillation fiber optic mesh measurement system according to an embodiment of the present invention; Figure 5 This is a schematic diagram of the electron distribution caused by superconducting high-frequency cavity field emission according to an embodiment of the present invention; Figure 6 This is a schematic diagram illustrating the determination of field emission electron loss points using an inner and outer scintillation fiber optic mesh measurement system according to an embodiment of the present invention. Figure 7 This is a schematic diagram of the principle of electron loss point emission based on fiber positioning field in an embodiment of the present invention; Figure 8 This is a structural block diagram of a modular photoelectric detection module according to an embodiment of the present invention. Detailed Implementation

[0017] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0018] It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions, and although a logical order is shown in the flowchart, in some cases the steps shown or described may be executed in a different order than that shown here.

[0019] Example 1 like Figure 1 As shown, this embodiment provides a method for measuring superconducting high-frequency cavity field-induced emission radiation based on scintillation fiber, including: Step 1: Optical signal generation and transmission: Field emission electrons in the superconducting high-frequency cavity collide with the cavity wall to generate secondary particles. These particles generate scintillation light in the scintillation fiber, and the scintillation photons are transmitted through the transmission fiber.

[0020] Step Two: Photoelectric Signal Conversion and Processing: The scintillation light is introduced into the photoelectric converter within the photoelectric detection module via a transmission optical fiber, where it is converted into an electrical pulse signal proportional to the light intensity. This signal is first amplified by a low-noise preamplifier, and then noise is suppressed and the pulse shape is optimized through shaping and filtering circuits. Subsequently, a high-speed analog-to-digital converter digitally samples the signal, performs high-precision time stamping through a time stamping unit, and stores it in the data storage unit.

[0021] Step 3: Data Analysis and Evaluation: The computer system first performs energy spectrum analysis on the digital pulse signal output by the photoelectric detection module to distinguish between bremsstrahlung photons and background signals; secondly, it combines the triggering timing and signal intensity distribution of the double-layer fiber network mesh to reconstruct the location of field emission hotspots in three dimensions; finally, it dynamically evaluates the evolution trend of field emission through time correlation analysis, and the output information includes energy spectrum, radiation dose and spatial distribution.

[0022] The role of energy spectrum analysis is to extract energy features from the detector signal, serving as input for 3D reconstruction. Time correlation analysis (TCR) draws its data foundation from both energy spectrum analysis and 3D reconstruction. TCR dynamically tracks these results over time to reveal the evolution of field-induced emission hotspots.

[0023] Energy spectrum, dose, and spatial distribution are the combined products of three analyses. The direct output of energy spectrum analysis is the "energy spectrum" information itself, from which radiation "dose" information can be calculated. The direct output of 3D reconstruction is the spatial distribution information of hotspots. Temporal correlation analysis uses the outputs of the first two analyses over time as its data foundation for higher-order processing. Its output is an "evolution trend," such as how the energy spectrum changes, whether the dose rate increases or decreases, and how the hotspot location moves—dynamic information such as these.

[0024] like Figure 2 As shown, this embodiment provides a superconducting high-frequency cavity field emission radiation measurement device based on scintillation fiber, comprising: The components include an analysis module, a photoelectric detection module, a transmission optical fiber, a scintillation fiber optic grid, a superconducting high-frequency cavity, a Dewar structure, and a shielding body.

[0025] The superconducting high-frequency cavity is located inside the Dewar canister and is sealed by the Dewar cover to form a sealed low-temperature environment; Two independent scintillation fiber grids are arranged on the outer wall of the superconducting high-frequency cavity. The inner scintillation fiber grid is arranged close to the outer surface of the superconducting high-frequency cavity to capture secondary particles generated by field emission electrons hitting the cavity wall. The outer scintillation fiber grid is arranged around the outer side of the inner scintillation fiber grid to further obtain spatial distribution information of secondary particles and bremsstrahlung.

[0026] Each layer of scintillation fiber optic mesh is connected to a corresponding transmission fiber, which passes through the Dewar cover and leads to the photoelectric detection module in the normal temperature range.

[0027] The photoelectric detection module is electrically connected to the computer system. The photoelectric detection module is used to convert the scintillation light signal output from the transmission optical fiber into an electrical signal and perform front-end processing. The computer system is used to analyze the acquired signal and output information such as the energy spectrum, intensity, and position of field emission electrons and bremsstrahlung photons.

[0028] An external shield surrounds the entire Dewar structure to shield against radiation generated by field emission electrons.

[0029] The inner scintillation fiber mesh of this invention is as follows: Figure 3 As shown, inner layer (symbol) I ) Scintillation fiber measurement grid consists of vertical direction (symbol) V ) and horizontal direction (symbol) H It consists of scintillation fibers. The inner scintillation fibers are evenly spaced, and the spacing can be determined according to the cavity size and detection resolution requirements. The scintillation fibers are numbered as follows: IV 1. IV 2. IV 3…… IV n The horizontal direction is consistent with the radial direction of the superconducting high-frequency cavity, and the scintillation fiber is numbered as follows: IH 1. IH 2. IH 3…… IH n The inner scintillation fiber is selected from scintillation fibers with high light yield, high radiation tolerance, and low self-attenuation. The spectral measurement range of the photodetector module should be matched with the scintillation photon energy spectrum.

[0030] The outer scintillation fiber mesh of this invention is as follows: Figure 4 As shown, the outer layer (symbol) O ) Scintillation fiber measurement grid consists of vertical direction (symbol) V ) and horizontal direction (symbol) H The system consists of scintillation fibers. The outer scintillation fibers are evenly spaced, with the spacing determined by the cavity size and required detection resolution. A certain perpendicular spacing is maintained between the outer and inner fibers to reduce mutual optical crosstalk while ensuring three-dimensional detection capability for secondary particles. The scintillation fibers are numbered as follows: OV 1. OV 2. OV 3…… OV n The horizontal direction is consistent with the radial direction of the superconducting high-frequency cavity, and the scintillation fiber is numbered as follows: OH 1. OH 2. OH 3…… OH n The outer scintillation fiber is selected from scintillation fibers with high light yield, high radiation tolerance, and low self-attenuation. The spectral measurement range of the photodetector module should be matched with the scintillation photon energy spectrum.

[0031] The invention relates to the field emission electron distribution within a superconducting high-frequency cavity, such as... Figure 5 As shown, due to the periodic changes in the electromagnetic field within the superconducting high-frequency cavity, the spatial distribution of field-emitted electrons is very complex. For example... Figure 5As shown, assuming the emission point is located at iris 2, electrons can reach almost any location within the cavity under the influence of the electromagnetic field. However, it is certain that the energy distribution of electrons reaching different locations will differ, a fact that can be verified using the finite element method software CST. Therefore, the energy spectrum characteristics of field-emission electrons can be analyzed to determine the location of the emission point, providing an important reference for subsequent improvements in cavity fabrication technology and performance.

[0032] A schematic diagram illustrating the radiation signal generated by field emission electrons in the inner and outer layers of scintillation fiber optic meshes of this invention, as shown below. Figure 6 As shown, field-emission electrons are lost on the cavity walls after traveling a certain distance within the cavity, such as iris electrons. n cell n Waiting for the location, n Number the cavities. Figure 5 The illustration given shows the loss occurring in cell 2. The numerous secondary particles generated produce signals and yield three-dimensional radiation field images in both the inner and outer scintillation fiber meshes, exhibiting differences in signal strength across different regions. In the inner scintillation fiber mesh, [signals are generated]. IS 1. IS 2. IS 3…… IS n Similarly, signals will be generated in the outer scintillation fiber optic mesh. OS 1. OS 2. OS 3…… OS n Signals are expected. Previous Monte Carlo simulations indicate that the radiation field generated by field-induced emission electron bombardment on the cavity wall exhibits forward momentum, which becomes more pronounced with higher energy. For example, in... Figure 6 In the middle, it manifests as a radiation signal that is more consistent with the incident direction of field emission electrons. IS 3 and OS The intensity of signal 3 is higher than that in other directions. Therefore, the signal intensity of the inner and outer scintillation fibers can be used to determine the location and incident direction of the field-induced emission electron loss, and further, the electron energy spectrum information can be deduced to determine the emission point. This is because the energy spectrum characteristics of electrons initially emitted from different positions are unique after acceleration within the cavity.

[0033] The schematic diagram of the present invention for locating the field-induced emission electron signal point in a scintillation fiber is shown below. Figure 7 As shown, assuming the total length of the optical fiber is... L The distance from the loss point to the photodetector module 1 on the left is X Then the distance from the right end is L - X Optical signals (including inner layer optical signals) ISn and outer light signals OS n The time difference between the arrival times of photodetector modules 1 and 2 at both ends is: Δ t = t 1- t 2=( X / v )–[( L - X ) / v ]=(2 X - L ) / v Therefore, we can solve for: X =[ L + v Δ t ] / 2. Where, v The speed at which light signals propagate in an optical fiber can be expressed using the fiber's refractive index. n with the speed of light c To calculate, that is v = c / n The time difference Δ t It can be measured by a low-level timing system.

[0034] The structural block diagram of the photoelectric detection module is as follows: Figure 8 As shown, the photoelectric detection module comprises a photodetector, a preamplifier unit, a signal filter, an analog-to-digital converter (ADC), a time stamping unit, and a data storage unit. The output of the photodetector is connected to the input of the preamplifier unit, the output of the preamplifier unit is connected to the input of the signal filter, the output of the signal filter is connected to the input of the ADC, the output of the ADC is connected to the input of the time stamping unit, and the output of the time stamping unit is connected to the data storage unit. The photodetector receives photons transmitted from the scintillation fiber via a transmission optical fiber and converts them into a primary current signal.

[0035] The preamplifier unit is directly connected to the output of the photodetector, employing a low-noise operational amplifier to achieve current-to-voltage conversion and primary signal amplification, ensuring that weak signals can be reliably processed by subsequent circuits. A signal filter is connected to the preamplifier output to suppress high-frequency noise and low-frequency drift, preserving the target pulse signal frequency band. The analog-to-digital converter (ADC) is connected to the signal filter output, accurately sampling and converting the analog voltage pulses into digital signals. A time stamping unit is connected to the ADC output, using a high-precision timing chip to mark the arrival time of each pulse, achieving event time resolution. The data storage unit stores the timestamped digital pulse data for further analysis by a computer.

[0036] This invention aims to address several technical bottlenecks in existing measurement technologies operating in superconducting high-frequency cavity environments, particularly the challenges of traditional detectors struggling to adapt and maintain stable operation under complex conditions such as low temperatures, high electromagnetic interference, strong radiation, and limited space. This invention utilizes plastic scintillation fiber as the core detection element, offering advantages such as high mechanical flexibility, low-temperature resistance, and radiation resistance, enabling normal operation in extreme environments. The scintillation fiber converts incoming ionizing radiation into visible light signals. It can be wound or adhered to the cavity surface, achieving wide-area, high-density coverage, suitable for radiation monitoring of complex geometries. The system generates light signals through the interaction of X-rays or secondary electrons produced by field emission electrons with the scintillation material. These signals are transmitted using ordinary optical fibers, and signal acquisition and processing are performed via a remote photoelectric detection module and a computer system, avoiding interference from the strong electromagnetic field of the high-frequency cavity on the electronic system.

[0037] This invention utilizes an inner and outer two-layer scintillation fiber optic mesh system to perform real-time monitoring and imaging of the radiation field surrounding the cavity, and can accurately analyze high-intensity signal points, providing field emission diagnostic capabilities. Furthermore, its modular design facilitates integration, maintenance, and expansion, making it suitable for different types of superconducting high-frequency cavity systems.

[0038] In summary, this invention features high sensitivity, strong radiation resistance, strong anti-interference capability, and flexible deployment. It can effectively solve the technical problem that existing technologies cannot accurately measure and diagnose field emission radiation in low-temperature, high-field environments, and has broad application prospects and practical engineering value.

[0039] The above are merely preferred embodiments of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.

Claims

1. A method for measuring superconducting high-frequency cavity field-induced emission radiation based on scintillation fiber, characterized in that, include: Scintillation fiber optic mesh, transmission fiber optic cable, photoelectric detection module, Dewar structure and analysis module; The scintillation fiber grid includes an inner scintillation fiber grid and an outer scintillation fiber grid, which are arranged on the outer wall of the superconducting high-frequency cavity to convert radiation particles into scintillation light signals. The transmission optical fiber is used to transmit the scintillation signal to the photoelectric detection module; The photoelectric detection module is used to convert the flashing light signal into a digital pulse signal and store it; The Dewar structure is used to house the superconducting high-frequency cavity and provide a low-temperature testing environment; The analysis module is used to obtain the energy spectrum characteristics, spatial distribution, and dynamic trend of field emission radiation based on the digital pulse signal. The inner scintillation fiber grid is arranged close to the outer surface of the cavity, and the outer scintillation fiber grid is arranged around the outer side of the inner scintillation fiber grid, with a gap between the two grids; both the inner and outer scintillation fiber grids are composed of vertical and horizontal scintillation fibers, which are equidistantly distributed; the spacing of the scintillation fibers is determined according to the cavity size and detection resolution requirements. The measurement steps include: Field emission electrons bombard the walls of a superconducting high-frequency cavity to generate secondary particles. The scintillation light excited by these secondary particles is captured by a scintillation fiber grid arranged around the outer periphery of the superconducting high-frequency cavity, thus obtaining a scintillation light signal. A digital pulse signal is obtained based on the flickering light signal; The digital pulse signal is subjected to energy spectrum analysis, spatial three-dimensional reconstruction and time correlation analysis, and the energy spectrum, spatial distribution and evolution trend information of field emission electrons are output respectively; The method involves determining the location and incident direction of electron loss in field emission by analyzing the signal strength of the inner and outer scintillation fibers, and then further deducing the electron energy spectrum information to determine the emission point, thereby realizing the measurement of field emission radiation in a superconducting high-frequency cavity.

2. The method for measuring superconducting high-frequency cavity field-induced emission radiation based on scintillation fiber according to claim 1, characterized in that, The process of obtaining a digital pulse signal based on the flickering light signal includes: The flashing light signal is converted into an electrical pulse signal proportional to the light intensity by a photoelectric converter; the electrical pulse signal is amplified by a low-noise preamplifier and noise is suppressed by a shaping and filtering circuit; the processed signal is digitally sampled by a high-speed analog-to-digital converter and time-marked with high precision by a time stamping unit to obtain a digital pulse signal.

3. The method for measuring superconducting high-frequency cavity field-induced emission radiation based on scintillation fiber according to claim 1, characterized in that, Based on the timing and signal intensity distribution of the dual-layer fiber optic network mesh triggering, the location of the field-induced emission hotspot is reconstructed in three dimensions to obtain the spatial distribution of radiation.

4. The method for measuring superconducting high-frequency cavity field-induced emission radiation based on scintillation fiber according to claim 1, characterized in that, The Dewar structure includes a Dewar canister and a Dewar cover; the inner and outer scintillation fiber optic grids are connected to the corresponding transmission fiber optics, and the transmission fiber optics pass through the Dewar cover and are connected to the photoelectric detection module.

5. The method for measuring superconducting high-frequency cavity field-induced emission radiation based on scintillation fiber according to claim 1, characterized in that, The photoelectric detection module includes a photoelectric detector, a preamplifier unit, a signal filter, an analog-to-digital converter, a time stamp unit, and a data storage unit; A photodetector is used to convert optical signals into electrical signals; A preamplifier unit is used to amplify the electrical signal with low noise. Signal filters are used to remove noise and retain the target pulse signal frequency band. An analog-to-digital converter is used to accurately sample analog voltage pulses and convert them into digital pulse signals. The time stamp unit is used to mark the arrival time of each digital pulse signal; Data storage unit, used to store the marked digital pulse signal.

6. The method for measuring superconducting high-frequency cavity field-induced emission radiation based on scintillation fiber according to claim 5, characterized in that, It also includes an external shield that surrounds the entire Dewar structure to shield the radiation generated by field emission electrons.

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