Pub Date : 2021-05-20DOI: 10.11884/HPLPB202133.200335
Wang Ziyu, Shang Jihua, Yang Xinyu, Zhang Jiuxing
The effect of the parameters (sintering temperature, pressure, holding time) of spark plasma sintering technique on the W porosity of Ba-W cathode was studied by orthogonal method. When the W porosity varied in the range of 23%−30%, the corresponding process parameters were obtained. On this basis, the spherical and traditional irregular W matrix with different porosity were sintered. The results show that the spherical porous W particles were packed and arranged orderly, and the pore size distribution was concentrated and uniform. When the porosity of spherical W was 26.3%, the size of the median pore was 1.41 μm. The vickers hardness of spherical tungsten matrix was lower than that of conventional irregular tungsten matrix. Under the condition of pulse width 10 μs and frequency 1000 Hz, the impulse current density of Ba-W cathode increased at first and then decreased with the increase in porosity. The maximum current density belonged to the Ba-W cathode with the matrix porosity of 26.3%. At 1050 ℃, the off-point emission current density of Ba-W cathode reached 24.62 A/cm2, the corresponding zero-field current density and workfunction were 7.62 A/cm2 and 1.95 eV, respectively.
{"title":"Microstructure characterization and thermionic emission performance of barium-tungsten cathode","authors":"Wang Ziyu, Shang Jihua, Yang Xinyu, Zhang Jiuxing","doi":"10.11884/HPLPB202133.200335","DOIUrl":"https://doi.org/10.11884/HPLPB202133.200335","url":null,"abstract":"The effect of the parameters (sintering temperature, pressure, holding time) of spark plasma sintering technique on the W porosity of Ba-W cathode was studied by orthogonal method. When the W porosity varied in the range of 23%−30%, the corresponding process parameters were obtained. On this basis, the spherical and traditional irregular W matrix with different porosity were sintered. The results show that the spherical porous W particles were packed and arranged orderly, and the pore size distribution was concentrated and uniform. When the porosity of spherical W was 26.3%, the size of the median pore was 1.41 μm. The vickers hardness of spherical tungsten matrix was lower than that of conventional irregular tungsten matrix. Under the condition of pulse width 10 μs and frequency 1000 Hz, the impulse current density of Ba-W cathode increased at first and then decreased with the increase in porosity. The maximum current density belonged to the Ba-W cathode with the matrix porosity of 26.3%. At 1050 ℃, the off-point emission current density of Ba-W cathode reached 24.62 A/cm2, the corresponding zero-field current density and workfunction were 7.62 A/cm2 and 1.95 eV, respectively.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":"33 1","pages":"053001-1-053001-8"},"PeriodicalIF":0.0,"publicationDate":"2021-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47622049","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-20DOI: 10.11884/HPLPB202133.210007
Rong Fan, Zhong Longquan, Liu Qiang, Yan Liping, Zhao Xiang
In this paper, a modeling method of actual bending random bundled wire harness is proposed. Firstly, based on image recognition technology, the three-dimensional coordinates of bending wire harness axis are reconstructed by using two photos of actual wire harness in side view and top view; then the random bundled wire harness is realized based on random transfer path method. Based on this modeling method, this paper analyzes the statistical characteristics of distribution parameters of bending random wire harness by Monte Carlo simulation, and finds that the variation trend of self inductance, mutual inductance and mutual capacitance along the line is consistent with the variation trend of wire harness height, while the trend of self capacitance is opposite; the coefficient of variation of self capacitance, self inductance and mutual inductance has negative correlation with wire harness height; the bundling randomness is not obvious It will change the mean value of self inductance and self capacitance, but reduce the mean value of mutual capacitance and mutual inductance.
{"title":"Modeling and statistical analysis of distribution parameters of random cable bundles based on image recognition technology","authors":"Rong Fan, Zhong Longquan, Liu Qiang, Yan Liping, Zhao Xiang","doi":"10.11884/HPLPB202133.210007","DOIUrl":"https://doi.org/10.11884/HPLPB202133.210007","url":null,"abstract":"In this paper, a modeling method of actual bending random bundled wire harness is proposed. Firstly, based on image recognition technology, the three-dimensional coordinates of bending wire harness axis are reconstructed by using two photos of actual wire harness in side view and top view; then the random bundled wire harness is realized based on random transfer path method. Based on this modeling method, this paper analyzes the statistical characteristics of distribution parameters of bending random wire harness by Monte Carlo simulation, and finds that the variation trend of self inductance, mutual inductance and mutual capacitance along the line is consistent with the variation trend of wire harness height, while the trend of self capacitance is opposite; the coefficient of variation of self capacitance, self inductance and mutual inductance has negative correlation with wire harness height; the bundling randomness is not obvious It will change the mean value of self inductance and self capacitance, but reduce the mean value of mutual capacitance and mutual inductance.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":"33 1","pages":"053002-1-053002-8"},"PeriodicalIF":0.0,"publicationDate":"2021-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44491347","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-20DOI: 10.11884/HPLPB202133.210002
Zhao Zhengyuan, L. Wenxin, Yan Longlong, Ou Yue
High frequency system is the key part of folded-waveguide (FW) traveling-wave tube (TWT), it will directly affect the operating frequency, bandwidth, gain and other indicators of TWT. In order to obtain larger output power and higher gain than a conventional single-beam FWTWT, the basic characteristics of the 0.34 THz high order mode two-beam FWTWT are studied. Firstly, the dispersion characteristics and interaction impedance of two-beam FW are calculated and compared with the results of simulation. The results show that the theory of dispersion characteristics is consistent with the simulation results and the interaction impedance matches well in high frequency band. CST studio suite is used to simulate the beam-wave interaction of the two-beam FW, and the output power is 41.68 W. In order to obtain high output, the height of the straight is increased. And the 63.12 W output is obtained with an increase of 52.7%. High frequency system is constituted by mode converter and output window structure, and good transmission characteristics are obtained within 25 GHz bandwidth. In the operating bandwidth, |S11| is greater than 15 dB, |S21| is less than 4.5 dB.
高频系统是折叠波导行波管的关键部分，它将直接影响到行波管的工作频率、带宽、增益等指标。为了获得比传统单束FWTWT更大的输出功率和更高的增益，对0.34 THz高阶模双束FWTWT的基本特性进行了研究。首先，计算了双波束FW的色散特性和相互作用阻抗，并与仿真结果进行了比较。结果表明，色散特性理论与仿真结果吻合较好，在高频段内相互作用阻抗吻合较好。采用CST studio suite模拟双波束FW的波束波相互作用，输出功率为41.68 W。为了获得高的输出，增加了直管的高度。输出功率为63.12 W，提高了52.7%。高频系统由模式变换器和输出窗结构组成，在25ghz带宽范围内具有良好的传输特性。在工作带宽中，|S11|大于15db， |S21|小于4.5 dB。
{"title":"Design of high frequency system of 0.34 THz high order mode two-beam folded waveguide traveling wave tube","authors":"Zhao Zhengyuan, L. Wenxin, Yan Longlong, Ou Yue","doi":"10.11884/HPLPB202133.210002","DOIUrl":"https://doi.org/10.11884/HPLPB202133.210002","url":null,"abstract":"High frequency system is the key part of folded-waveguide (FW) traveling-wave tube (TWT), it will directly affect the operating frequency, bandwidth, gain and other indicators of TWT. In order to obtain larger output power and higher gain than a conventional single-beam FWTWT, the basic characteristics of the 0.34 THz high order mode two-beam FWTWT are studied. Firstly, the dispersion characteristics and interaction impedance of two-beam FW are calculated and compared with the results of simulation. The results show that the theory of dispersion characteristics is consistent with the simulation results and the interaction impedance matches well in high frequency band. CST studio suite is used to simulate the beam-wave interaction of the two-beam FW, and the output power is 41.68 W. In order to obtain high output, the height of the straight is increased. And the 63.12 W output is obtained with an increase of 52.7%. High frequency system is constituted by mode converter and output window structure, and good transmission characteristics are obtained within 25 GHz bandwidth. In the operating bandwidth, |S11| is greater than 15 dB, |S21| is less than 4.5 dB.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":"33 1","pages":"053004-1-053004-8"},"PeriodicalIF":0.0,"publicationDate":"2021-05-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44962004","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-02DOI: 10.11884/HPLPB202133.200297
Wang Anxin, W. Zihao, Ma Huizhou, Liang Chunhua, Ni Xiaojun, C. Jiaxin, Zhu Donghui, Yu Jiebing, He Huayan, Wang Guangyuan, Yu Yongji, Li Renhong, Zhang Junsong, Qiu Ruiyang, L. Lei, K. Ling
Based on thermal stability and vibration stability, an ultra stability structure of rigid support is designed and optimized. Through the finite element modal analysis of ANSYS, the thermal expansion variation and the characteristic frequency of the support is verified. The support is fixated to the ground by using the method of concrete grouting and then the characteristic frequency is tested. The test results show that the characteristic frequency of the support reaches up to 61.9 Hz and the vibration amplitude is less than 30 nm, both of which meet the design requirements. Finally, the method of dynamic stiffness testing is adopted to obtain the stiffness value of the concrete grouting, and the accuracy of the optimization results of the support is further verified.
{"title":"Structural optimization design for beam position monitor support of High Energy Photon Source","authors":"Wang Anxin, W. Zihao, Ma Huizhou, Liang Chunhua, Ni Xiaojun, C. Jiaxin, Zhu Donghui, Yu Jiebing, He Huayan, Wang Guangyuan, Yu Yongji, Li Renhong, Zhang Junsong, Qiu Ruiyang, L. Lei, K. Ling","doi":"10.11884/HPLPB202133.200297","DOIUrl":"https://doi.org/10.11884/HPLPB202133.200297","url":null,"abstract":"Based on thermal stability and vibration stability, an ultra stability structure of rigid support is designed and optimized. Through the finite element modal analysis of ANSYS, the thermal expansion variation and the characteristic frequency of the support is verified. The support is fixated to the ground by using the method of concrete grouting and then the characteristic frequency is tested. The test results show that the characteristic frequency of the support reaches up to 61.9 Hz and the vibration amplitude is less than 30 nm, both of which meet the design requirements. Finally, the method of dynamic stiffness testing is adopted to obtain the stiffness value of the concrete grouting, and the accuracy of the optimization results of the support is further verified.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":"33 1","pages":"044006-1-044006-9"},"PeriodicalIF":0.0,"publicationDate":"2021-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43589784","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-02DOI: 10.11884/HPLPB202133.200331
Wang Sihao, Liao Cheng, Shan Yuping, Zhang Runwu
The design concept of employing the dynamically reconfigurable scattering pattern to enhance radar cross-section is proposed and examined. In combination with varactor loading, a physical unit cell geometry with an embedded bias network for the varactors is utilized to build the metasurface. Biased by an applied direct-current source with voltage gradient, the proposed active metasurface can exhibit electrically tunable reflection phase distributions for either normal or oblique incidence plane wave, so as to achieve flexible redirection of the angle of reflection. As a result, the agile effect for monostatic or bistatic cross-section enhancement is then facilitated. Taking a conducting plate as an example, three different incidence and reflection scenarios are considered for calculation and full-wave simulation. Reconfigurable scattering patterns produced at the operating frequency of 10 GHz by the presented design are observed, which indicates its capability of real-time control of the angle of reflection. In conjunction with an experimental measurement, the effective enhancement of monostatic and bistatic cross-sections are validated.
{"title":"Agile design of cross-section enhancement of a conducting plate radar through active metasurface","authors":"Wang Sihao, Liao Cheng, Shan Yuping, Zhang Runwu","doi":"10.11884/HPLPB202133.200331","DOIUrl":"https://doi.org/10.11884/HPLPB202133.200331","url":null,"abstract":"The design concept of employing the dynamically reconfigurable scattering pattern to enhance radar cross-section is proposed and examined. In combination with varactor loading, a physical unit cell geometry with an embedded bias network for the varactors is utilized to build the metasurface. Biased by an applied direct-current source with voltage gradient, the proposed active metasurface can exhibit electrically tunable reflection phase distributions for either normal or oblique incidence plane wave, so as to achieve flexible redirection of the angle of reflection. As a result, the agile effect for monostatic or bistatic cross-section enhancement is then facilitated. Taking a conducting plate as an example, three different incidence and reflection scenarios are considered for calculation and full-wave simulation. Reconfigurable scattering patterns produced at the operating frequency of 10 GHz by the presented design are observed, which indicates its capability of real-time control of the angle of reflection. In conjunction with an experimental measurement, the effective enhancement of monostatic and bistatic cross-sections are validated.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":"33 1","pages":"043002-1-043002-7"},"PeriodicalIF":0.0,"publicationDate":"2021-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45574984","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-02DOI: 10.11884/HPLPB202133.200340
He Yongcheng, Zhang Yu-liang, Wang Lin, Jin Dapeng, Wu Xuan, Kang Mingtao, Guo Fengqin, Zhu Peng
To send out early warnings before some failures of the China Spallation Neutron Source (CSNS) accelerator, the feature models of the CSNS accelerator vacuums and drift tube linac (DTL) temperatures have been established based on deep learning, and a prototype of an early warning system has been developed. This prototype of an early warning system was built based on the experimental physics and industrial control system (EPICS) architecture, and it is mainly composed of three parts: training, recognition and information release. Python was adopted for program design and development, and functions such as training samples acquisition, deep learning networks design and training, online recognition and information release have been realized. The test results show that the accuracy of this prototype can reach 98.4% for the test set generated based on the historical data of the CSNS accelerator vacuums and DTL temperatures, and the anomalies of the CSNS accelerator vacuums and DTL temperatures can be recognized based on the real-time data, and the early warnings can be sent out, which proves its feasibility and effectiveness.
{"title":"Prototype of an early warning system based on deep learning for the CSNS accelerator","authors":"He Yongcheng, Zhang Yu-liang, Wang Lin, Jin Dapeng, Wu Xuan, Kang Mingtao, Guo Fengqin, Zhu Peng","doi":"10.11884/HPLPB202133.200340","DOIUrl":"https://doi.org/10.11884/HPLPB202133.200340","url":null,"abstract":"To send out early warnings before some failures of the China Spallation Neutron Source (CSNS) accelerator, the feature models of the CSNS accelerator vacuums and drift tube linac (DTL) temperatures have been established based on deep learning, and a prototype of an early warning system has been developed. This prototype of an early warning system was built based on the experimental physics and industrial control system (EPICS) architecture, and it is mainly composed of three parts: training, recognition and information release. Python was adopted for program design and development, and functions such as training samples acquisition, deep learning networks design and training, online recognition and information release have been realized. The test results show that the accuracy of this prototype can reach 98.4% for the test set generated based on the historical data of the CSNS accelerator vacuums and DTL temperatures, and the anomalies of the CSNS accelerator vacuums and DTL temperatures can be recognized based on the real-time data, and the early warnings can be sent out, which proves its feasibility and effectiveness.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":"33 1","pages":"044008-1-044008-7"},"PeriodicalIF":0.0,"publicationDate":"2021-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"49082036","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-02DOI: 10.11884/HPLPB202133.200353
Han Fei, X. Lei, Liu Baojian
Linearizer is a key component in the millimeter-wave communication system, it plays an important role in improving the linearity performance of amplifier and communication quality. At present, the development of traveling-wave tube amplifier (TWTA) linearization technology cannot meet the application requirements of communication technology, therefore, the research of linearization technology is very important. In this paper we propose a kind of a new wide-band analog pre-distortion structure used to improve the nonlinear characteristics of Ka-band TWTA. The simulation results show that when the input power changes from −20 to 10 dBm in the frequency range of 26−30 GHz, the gain expansion of the linearizer is greater than 5.08 dB, and the phase expansion exceeds 64.81°. The linearizer and the TWTA are cascaeded for testing. The test results show that the gain compression and phase compression of center frequence is less than 3.12 dB and 2.31° respectively, and the third-order intermodulation (IMD3) improves significantly.
{"title":"Study on linearization of Ka-band wideband traveling-wave tube amplifer","authors":"Han Fei, X. Lei, Liu Baojian","doi":"10.11884/HPLPB202133.200353","DOIUrl":"https://doi.org/10.11884/HPLPB202133.200353","url":null,"abstract":"Linearizer is a key component in the millimeter-wave communication system, it plays an important role in improving the linearity performance of amplifier and communication quality. At present, the development of traveling-wave tube amplifier (TWTA) linearization technology cannot meet the application requirements of communication technology, therefore, the research of linearization technology is very important. In this paper we propose a kind of a new wide-band analog pre-distortion structure used to improve the nonlinear characteristics of Ka-band TWTA. The simulation results show that when the input power changes from −20 to 10 dBm in the frequency range of 26−30 GHz, the gain expansion of the linearizer is greater than 5.08 dB, and the phase expansion exceeds 64.81°. The linearizer and the TWTA are cascaeded for testing. The test results show that the gain compression and phase compression of center frequence is less than 3.12 dB and 2.31° respectively, and the third-order intermodulation (IMD3) improves significantly.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":"33 1","pages":"043003-1-043003-6"},"PeriodicalIF":0.0,"publicationDate":"2021-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48953027","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-02DOI: 10.11884/HPLPB202133.200310
Xia Qianxu, Zhao Quantang, Zong Yang, Cao Shuchun, Li Zhongping, Shen Xiaokang, Zhan Zimin
The electron gun with high repetition rate and high average current has a very wide range of applications. This paper presents the design of a microwave grid-controlled high-voltage thermionic electron gun working in CW mode with a bunch repetition rate of 325 MHz and elaborates the experimental principles of this kind of electron guns. Firstly, simulation software EGUN, POISSON (Poisson Superfish) and GPT (General Particle Tracer) are used to accomplish the structure design of a300kV high-voltage DC electron gun and beam dynamics verification.Secondly, to feed the microwave into the gap between the cathode and the grid of the electron gunefficiently, design of a power supply with a scheme of impedance matching from the radio frequency power source to the cathode is completed.Accordingly, a 325 MHz dual-mode coaxial power supply device is designed, and its feasibility is verified and analyzed..
{"title":"Design of 325 MHz RF grid-controlled high voltage thermionic cathode electron gun","authors":"Xia Qianxu, Zhao Quantang, Zong Yang, Cao Shuchun, Li Zhongping, Shen Xiaokang, Zhan Zimin","doi":"10.11884/HPLPB202133.200310","DOIUrl":"https://doi.org/10.11884/HPLPB202133.200310","url":null,"abstract":"The electron gun with high repetition rate and high average current has a very wide range of applications. This paper presents the design of a microwave grid-controlled high-voltage thermionic electron gun working in CW mode with a bunch repetition rate of 325 MHz and elaborates the experimental principles of this kind of electron guns. Firstly, simulation software EGUN, POISSON (Poisson Superfish) and GPT (General Particle Tracer) are used to accomplish the structure design of a300kV high-voltage DC electron gun and beam dynamics verification.Secondly, to feed the microwave into the gap between the cathode and the grid of the electron gunefficiently, design of a power supply with a scheme of impedance matching from the radio frequency power source to the cathode is completed.Accordingly, a 325 MHz dual-mode coaxial power supply device is designed, and its feasibility is verified and analyzed..","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":"33 1","pages":"044009-1-044009-7"},"PeriodicalIF":0.0,"publicationDate":"2021-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47603628","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-05-02DOI: 10.11884/HPLPB202133.200243
Liao Haiyang, Zhang Zhanwen, Yi Yong, B. Peng, Luan Xu, Shi Ruiting
Based on the flow theory applicable to the whole Knudsen number range, a theoretical model for removing air from the target shot in inertial confinement fusion was established, and the reliability of the model was verified by designed experiments. The physical experiment requires the air concentration in the target shot to be lower than 10×10−6, the process of removing air in the target shot was simulated numerically, and the relationship between the air concentration in the target shot, the pressure in the target shot and time was emphatically analyzed. The time cost of three methods for removing the air in the target shot, namely the single-pipe one-time gas evacuation method, the single-pipe circulation gas evacuation method and the double-pipe flow washing method, were calculated and compared. Numerical calculation results show that: in the single-pipe one-time gas evacuation method, the existence of the micro-channel on the target shot has a non-negligible effect on the time required to remove the air in the target shot, and it takes 1961.77 h to make the air concentration in the target shot reach the standard when the micro-channel on the target shot and the gas-filling pipe is considered. In the single-pipe cycle gas evacuation method, the number of evacuation times and the degree of single gas evacuation will affect the total time required to remove the air in the target shot. When the single gas evacuation degree is at the optimal value, the plan that filling three times and evacuation four times can reduce the total time to reach the standard to about 1 h, while the single gas filling and gas evacuation times under this plan are 6 min and 10 min, respectively. However, it only takes 11 minutes to make the air concentration in the target shot reach the standard by using the double-pipe flow washing method.
{"title":"Multi-scale simulation and analysis of gas evacuation processes in a microcavity","authors":"Liao Haiyang, Zhang Zhanwen, Yi Yong, B. Peng, Luan Xu, Shi Ruiting","doi":"10.11884/HPLPB202133.200243","DOIUrl":"https://doi.org/10.11884/HPLPB202133.200243","url":null,"abstract":"Based on the flow theory applicable to the whole Knudsen number range, a theoretical model for removing air from the target shot in inertial confinement fusion was established, and the reliability of the model was verified by designed experiments. The physical experiment requires the air concentration in the target shot to be lower than 10×10−6, the process of removing air in the target shot was simulated numerically, and the relationship between the air concentration in the target shot, the pressure in the target shot and time was emphatically analyzed. The time cost of three methods for removing the air in the target shot, namely the single-pipe one-time gas evacuation method, the single-pipe circulation gas evacuation method and the double-pipe flow washing method, were calculated and compared. Numerical calculation results show that: in the single-pipe one-time gas evacuation method, the existence of the micro-channel on the target shot has a non-negligible effect on the time required to remove the air in the target shot, and it takes 1961.77 h to make the air concentration in the target shot reach the standard when the micro-channel on the target shot and the gas-filling pipe is considered. In the single-pipe cycle gas evacuation method, the number of evacuation times and the degree of single gas evacuation will affect the total time required to remove the air in the target shot. When the single gas evacuation degree is at the optimal value, the plan that filling three times and evacuation four times can reduce the total time to reach the standard to about 1 h, while the single gas filling and gas evacuation times under this plan are 6 min and 10 min, respectively. However, it only takes 11 minutes to make the air concentration in the target shot reach the standard by using the double-pipe flow washing method.","PeriodicalId":39871,"journal":{"name":"强激光与粒子束","volume":"33 1","pages":"042001-1-042001-8"},"PeriodicalIF":0.0,"publicationDate":"2021-05-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"46824105","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-04-15DOI: 10.11884/HPLPB202133.200268
Zhu Dechong, Sui Yan-feng, Yue Jun-hui, Peng Yuemei, Liu Jiaming, Cao Jian-she
High Energy Photon Source (HEPS) Booster is designed to ramp up the energy of the beam from linac and inject high quality electron beam to the storage ring. To measure the transverse beam size, emittance and energy spread of HEPS Booster, we designed two beam diagnostic beamlines at visible-UV spectrum region. The source points are at two bending magnets with different chromatic dispersion, one has no dispersion while the other has large dispersion. By measuring the transverse beam sizes with synchrotron imaging system, beam emittance and energy spread can also be calculated. This paper introduces the extraction of visible-UV light, and the optical imaging system, the spatial resolution. It also introduces the design of beam spot changes measurement during beam ramping process.
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