Laser and Particle Beams最新文献_第5页

Analysis of Destructive Effects with Electron Bombardment in Slow-Wave Structures 电子轰击在慢波结构中的破坏效应分析

IF 0.9 4区物理与天体物理

Laser and Particle Beams Pub Date : 2022-02-15 DOI: 10.1155/2022/8327755

Nongchao Tan, Ping Wu, Ye Hua, Jun Sun, Yibing Cao, Guangshuai Zhang, Wenhui Huang, Wen-hua Huang

{"title":"Analysis of Destructive Effects with Electron Bombardment in Slow-Wave Structures","authors":"Nongchao Tan, Ping Wu, Ye Hua, Jun Sun, Yibing Cao, Guangshuai Zhang, Wenhui Huang, Wen-hua Huang","doi":"10.1155/2022/8327755","DOIUrl":"https://doi.org/10.1155/2022/8327755","url":null,"abstract":"Radio frequency (RF) breakdown can result in pulse shortening and seriously degrade the stability and reliability of relativistic backward wave oscillators (RBWOs). This paper discusses the energy range of electrons causing breakdown traces in slow-wave structures (SWSs) through particle-in-cell (PIC) simulation, numerical calculation, and experimental verification. The PIC simulation and numerical calculation results reveal that the energy of the majority of the field-induced electrons bombarding the SWS surfaces after being accelerated is less than 120 keV. Furthermore, the micro appearances of the breakdown traces in SWSs and the witness targets bombarded directly by electrons of various energy levels have been analyzed. Scanning electron microscope (SEM) shows that the breakdown traces are featured with corrugated morphologies with a wide range and a shallow depth. A mass of craters emerge in the vicinity of the corrugated morphologies. These appearances are quite similar to destructive traces impacted directly by low-energy electrons (around 160 keV). Thus, it is confirmed that the breakdown traces result from the bombardment of low-energy electrons. Therefore, the breakdown mechanism of field-emitted electrons impacting on the structure surfaces in RBWOs has been further improved.","PeriodicalId":49925,"journal":{"name":"Laser and Particle Beams","volume":"42 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2022-02-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"88477566","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Bright High-Harmonic Generation through Coherent Synchrotron Emission Based on the Polarization Gating Scheme 基于极化门控方案的相干同步辐射产生明亮高谐波

IF 0.9 4区物理与天体物理

Laser and Particle Beams Pub Date : 2022-02-14 DOI: 10.1155/2022/6948110

Chuliang Zhou, Ye Tian, Yushan Zeng, Z. Zeng, Ruxin Li

引用次数: 1

The Effect of Ion-to-Electron Mass Ratio on the Electron Beam-Plasma Interaction 离子-电子质量比对电子束-等离子体相互作用的影响

IF 0.9 4区物理与天体物理

Laser and Particle Beams Pub Date : 2021-12-15 DOI: 10.1155/2021/9216171

M. Rafiei, M. Sahrai, M. Hosseinpour, A. Esfandyari-Kalejahi

{"title":"The Effect of Ion-to-Electron Mass Ratio on the Electron Beam-Plasma Interaction","authors":"M. Rafiei, M. Sahrai, M. Hosseinpour, A. Esfandyari-Kalejahi","doi":"10.1155/2021/9216171","DOIUrl":"https://doi.org/10.1155/2021/9216171","url":null,"abstract":"Two-dimensional electromagnetic particle-in-cell simulations are carried out to investigate the effect of ion-to-electron mass ratio on the evolution of warm electron beam-plasma instability. Four cases are considered: A: mi/me = 0 (two-electron stream instability); B: mi/me = 1 (pair plasma); C: mi/me = 100; and D: mi/me = 1000. It is shown that the generation of Langmuir waves in the fundamental mode of electron plasma frequency and the subsequent dynamics of large-amplitude solitons are not affected by the ion species. However, it determines the decay process of solitons and the excitation of electromagnetic waves in the second harmonic. In the first two cases, mi/me = 0 and 1, there is no sign of emission in the second harmonic, while the strongest emission in the second harmonic is found for the case of largest mass ratio, mi/me = 1000. This confirms the two-step wave-wave coupling mechanism for the generation of second harmonic electromagnetic waves, which requires the excitation of ion-acoustic waves in the first step. Moreover, the dispersion diagrams of all excited waves are presented.","PeriodicalId":49925,"journal":{"name":"Laser and Particle Beams","volume":"41 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2021-12-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"78077988","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Shock Hugoniot Data for Water up to 5 Mbar Obtained with Quartz Standard at High-Energy Laser Facilities 冲击Hugoniot数据水高达5毫巴获得石英标准在高能激光设施

IF 0.9 4区物理与天体物理

Laser and Particle Beams Pub Date : 2021-12-11 DOI: 10.1155/2021/4141522

D. Mancelli, I. Errea, A. Tentori, O. Turianska, H. Larreur, K. Katagiri, N. Ozaki, N. Kamimura, D. Kamibayashi, K. Ishida, H. Ogura, K. Kawasaki, Y. Maeda, Y. Hironaka, K. Shigemori, K. Batani, G. Schaumann, O. Rosmej, P. Neumayer, B. Zielbauer, A. Martynenko, E. Filippov, S. Pikuz, D. Batani

{"title":"Shock Hugoniot Data for Water up to 5 Mbar Obtained with Quartz Standard at High-Energy Laser Facilities","authors":"D. Mancelli, I. Errea, A. Tentori, O. Turianska, H. Larreur, K. Katagiri, N. Ozaki, N. Kamimura, D. Kamibayashi, K. Ishida, H. Ogura, K. Kawasaki, Y. Maeda, Y. Hironaka, K. Shigemori, K. Batani, G. Schaumann, O. Rosmej, P. Neumayer, B. Zielbauer, A. Martynenko, E. Filippov, S. Pikuz, D. Batani","doi":"10.1155/2021/4141522","DOIUrl":"https://doi.org/10.1155/2021/4141522","url":null,"abstract":"In this work, we present experimental results on the behavior of liquid water at megabar pressure. The experiment was performed using the HIPER (High-Intensity Plasma Experimental Research) laser facility, a uniaxial irradiation chamber of GEKKO XII (GXII) at the Institute of Laser Engineering (ILE), and the PHELIX at GSI (GSI Helmholtz Centre for Heavy Ion Research), a single-beam high-power laser facility, to launch a planar shock into solid multilayered water samples. Equation-of-state data of water \u0000 \u0000 \u0000 \u0000 \u0000 \u0000 H\u0000 \u0000 \u0000 2\u0000 \u0000 \u0000 O\u0000 \u0000 \u0000 \u0000 are obtained in the pressure range 0.50–4.6 Mbar by tuning the laser-drive parameters. The Hugoniot parameters (pressure, density, etc.) and the shock temperature were simultaneously determined by using VISAR and SOP as diagnostic tools and quartz as the standard material for impedance mismatch experiments. Finally, our experimental results are compared with hydrodynamic simulations tested with different equations of state, showing good compatibility with tabulated SESAME tables for water.","PeriodicalId":49925,"journal":{"name":"Laser and Particle Beams","volume":"24 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2021-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"81689562","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Field Localization and Density Cavitation in Low-Beta Plasmas 低β等离子体中的场局域化和密度空化

IF 0.9 4区物理与天体物理

Laser and Particle Beams Pub Date : 2021-11-28 DOI: 10.1155/2021/2891080

M. Rinawa, P. Chauhan, Sintu Kumar, M. K. Singh, H. Singh, Amit Sharma, R. Sharma

{"title":"Field Localization and Density Cavitation in Low-Beta Plasmas","authors":"M. Rinawa, P. Chauhan, Sintu Kumar, M. K. Singh, H. Singh, Amit Sharma, R. Sharma","doi":"10.1155/2021/2891080","DOIUrl":"https://doi.org/10.1155/2021/2891080","url":null,"abstract":"In the present paper, filamentous structure formation, associated turbulent spectrum, and density cavity formation phenomena have been investigated for low-\u0000 \u0000 β\u0000 \u0000 plasma \u0000 \u0000 \u0000 \u0000 β\u0000 ≪\u0000 \u0000 \u0000 \u0000 \u0000 m\u0000 \u0000 \u0000 e\u0000 \u0000 \u0000 \u0000 /\u0000 \u0000 \u0000 \u0000 m\u0000 \u0000 \u0000 i\u0000 \u0000 \u0000 \u0000 \u0000 \u0000 \u0000 \u0000 applicable to the auroral region. A set of dimensionless equations governing the dynamics of three dimensionally propagating inertial Alfvén wave (3D-IAW) and perpendicularly propagating magnetosonic wave (PMSW) has been developed. Ponderomotive force due to 3D-IAW has been included in the dynamics of the PMSW. Numerical simulation has been performed to study the nonlinear coupling of these two waves. From the obtained results, we found that the field intensity localization takes place which may further lead to the additional dissipation/turbulence process for particle heating and acceleration in space plasma. The associated turbulent spectrum is obtained with scaling nearly \u0000 \u0000 \u0000 \u0000 k\u0000 \u0000 \u0000 −\u0000 4.28\u0000 \u0000 \u0000 \u0000 at smaller scales (in the dissipation range). Relevance of the obtained results with the observations reported by various spacecrafts such as Hawkeye and Heos 2 has been discussed. Also, density fluctuations (depletion) of \u0000 \u0000 ∼\u0000 0.10\u0000 \u0000 \u0000 \u0000 n\u0000 \u0000 \u0000 0\u0000 \u0000 \u0000 \u0000 are calculated, which are consistent with the FAST spacecraft observation reported.","PeriodicalId":49925,"journal":{"name":"Laser and Particle Beams","volume":"104 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2021-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"76075649","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

Longitudinal Beam Dynamics for the Heavy-Ion Synchrotron Booster Ring at HIAF HIAF重离子同步加速器加速环的纵束动力学

IF 0.9 4区物理与天体物理

Laser and Particle Beams Pub Date : 2021-11-20 DOI: 10.1155/2021/6665132

D. Yin, J. Liu, G. Shen, H. Du, J. Yang, L. Mao, F. Cai, W. Chai

{"title":"Longitudinal Beam Dynamics for the Heavy-Ion Synchrotron Booster Ring at HIAF","authors":"D. Yin, J. Liu, G. Shen, H. Du, J. Yang, L. Mao, F. Cai, W. Chai","doi":"10.1155/2021/6665132","DOIUrl":"https://doi.org/10.1155/2021/6665132","url":null,"abstract":"To accelerate high-intensity heavy-ion beams to high energy in the booster ring (BRing) at the High-Intensity Heavy-Ion Accelerator Facility (HIAF) project, we take the typical reference particle 238U35+, which can be accelerated from an injection energy of 17 MeV/u to the maximal extraction energy of 830 MeV/u, as an example to study the basic processes of longitudinal beam dynamics, including beam capture, acceleration, and bunch merging. The voltage amplitude, the synchronous phase, and the frequency program of the RF system during the operational cycle were given, and the beam properties such as bunch length, momentum spread, longitudinal beam emittance, and beam loss were derived, firstly. Then, the beam properties under different voltage amplitude and synchronous phase errors were also studied, and the results were compared with the cases without any errors. Next, the beam properties with the injection energy fluctuation were also studied. The tolerances of the RF errors and injection energy fluctuation were dictated based on the CISP simulations. Finally, the effect of space charge at the low injection energy with different beam intensities on longitudinal emittance and beam loss was evaluated.","PeriodicalId":49925,"journal":{"name":"Laser and Particle Beams","volume":"55 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2021-11-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"73966522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 0

A Compact High-Power Ultra-Wideband Bipolar Pulse Generator 一种紧凑的大功率超宽带双极脉冲发生器

IF 0.9 4区物理与天体物理

Laser and Particle Beams Pub Date : 2021-10-16 DOI: 10.1155/2021/2204782

Zhaoyang Wu, Weiguo Lu, Enyan Ding, Xiangyang Bao, Zhoubing Yang, F. Song

{"title":"A Compact High-Power Ultra-Wideband Bipolar Pulse Generator","authors":"Zhaoyang Wu, Weiguo Lu, Enyan Ding, Xiangyang Bao, Zhoubing Yang, F. Song","doi":"10.1155/2021/2204782","DOIUrl":"https://doi.org/10.1155/2021/2204782","url":null,"abstract":"A compact high-power ultra-wideband bipolar pulse generator based on a modified Marx circuit is designed, which is mainly composed of a primary power supply, Marx generator, sharpening and cutoff subnanosecond spark gap switches, and coaxial transmission lines. The Marx generator with modified circuit structure has thirty-two stages and is composed of eight disk-like modules. Each module consists of four capacitors, two spark gap switches, four charging inductors, and a mechanical support. To simplify the design of the charging structure and reduce the number of switches, four groups of inductors are used to charge the capacitors of the Marx generator, two of which are used for positive voltage charging and the other two for negative voltage charging. When the capacitor of each stage is charged to 35 kV, the maximum output peak voltage can reach 1 MV when the Marx generator is open circuit. The high-voltage pulse generated by the Marx generator charges the transmission line and forms a bipolar pulse through sharpening and cutoff switches. All transmission lines used for bipolar pulse generation have an impedance of 10 Ω. When the 950 kV pulse voltage generated by the Marx generator is fed into the transmission line, the bipolar pulse peak voltage can reach 390 kV, the center frequency of the pulse is about 400 MHz, and the output peak power is about 15.2 GW.","PeriodicalId":49925,"journal":{"name":"Laser and Particle Beams","volume":"16 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2021-10-16","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"77249459","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 1

Path Encoding Pulse Compression for Obtaining Novel HPM with Ultrahigh Repetition Frequency 路径编码脉冲压缩获得新型超高重复频率HPM

IF 0.9 4区物理与天体物理

Laser and Particle Beams Pub Date : 2021-09-07 DOI: 10.1155/2021/3259950

Jinyong Fang, Jiangniu Wu, Huijun Huang, Haoliang Zhang, Jing Sun, Jianjun Wang, Li Li

{"title":"Path Encoding Pulse Compression for Obtaining Novel HPM with Ultrahigh Repetition Frequency","authors":"Jinyong Fang, Jiangniu Wu, Huijun Huang, Haoliang Zhang, Jing Sun, Jianjun Wang, Li Li","doi":"10.1155/2021/3259950","DOIUrl":"https://doi.org/10.1155/2021/3259950","url":null,"abstract":"Based on the path encoding pulse compression teleology, a novel method for obtaining high-power microwave (HPM) pulse with ultrahigh repetition frequency is proposed in this paper. The mechanism of the path encoding pulse compression teleology is first introduced. And then, the obtained HPM pulse is analyzed. Theoretical analysis shows that the peak power of MW level and the repetition frequency of MHz level for the generated HPM pulse can be easily reached. To demonstrate the effectiveness of this method for obtaining HPM pulse with ultrahigh repetition frequency characteristic, a HPM-obtaining experiment was carried out based on an S-band microwave source. The HPM pulses with the width of 1 ns, 2 ns, and 3 ns are studied, respectively. The measured results show that the HPM pulse with the power higher than 100 kW and the repetition frequency of 250 kHz at the frequency of 2.856 GHz is easily obtained. The repetition frequency of the generated HPM pulse can be easily changed. Because the pulse with the power higher than 100 kW and the repetition frequency of several hundreds of kHz is obtained for the first time, this type of pulse will have a broad prospect of application in the communication, radar, and electronic countermeasure fields. In addition, the effect experiment of interfering communication and control links was carried out by utilizing the ultrahigh repetition frequency characteristic of the generated HPM pulse. Also, the experiment results show the feasibility of this pulse for interfering the communication and control links.","PeriodicalId":49925,"journal":{"name":"Laser and Particle Beams","volume":"35 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2021-09-07","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"86525766","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Characterization of Energetic Protons Generated in the ShenGuang-II UP Petawatt Laser Interactions with Foil Targets 神光- ii UP激光与箔靶相互作用高能质子的表征

IF 0.9 4区物理与天体物理

Laser and Particle Beams Pub Date : 2021-08-17 DOI: 10.1155/2021/7205383

Huiya Liu, A. Lei, N. Kang, H. An, Zhi-yong Xie, Yao Zhao, Shenlei Zhou, Mingying Sun, B. Zhu, Wei Wang, Jianqiang Zhu

{"title":"Characterization of Energetic Protons Generated in the ShenGuang-II UP Petawatt Laser Interactions with Foil Targets","authors":"Huiya Liu, A. Lei, N. Kang, H. An, Zhi-yong Xie, Yao Zhao, Shenlei Zhou, Mingying Sun, B. Zhu, Wei Wang, Jianqiang Zhu","doi":"10.1155/2021/7205383","DOIUrl":"https://doi.org/10.1155/2021/7205383","url":null,"abstract":"The characterization of energetic protons generated in the ShenGuang-II UP petawatt laser interactions with foil targets has been systematically studied. The proton energy spectra and angular distributions are measured with a radiochromic film stack. It shows that the proton energy spectra have a Boltzmann distribution with temperature of about 2.8 MeV and cutoff energy of about 20 MeV. The divergence angles of protons vary from 10° to 60°, dependent on the proton energy. The proton source size and location are investigated via the proton point-projection mesh imaging. The proton virtual sources are found to locate tens to hundreds of microns in front of the foil target, depending on the proton energies. A Monte Carlo simulation estimates the diameter of the virtual proton source to be about 12 μm for the protons with energy of 16.8 MeV, which is much smaller than the laser focus size of about 50 μm. The spatial resolution of the 16.8 MeV proton imaging is quantified with the point spread function to be about 15 μm, which is consistent with the proton virtual source size. These results will be important for the users conducting experiments with the protons as a backlighting source on the ShenGuang-II UP petawatt laser.","PeriodicalId":49925,"journal":{"name":"Laser and Particle Beams","volume":"38 1","pages":""},"PeriodicalIF":0.9,"publicationDate":"2021-08-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"74120761","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":4,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Modeling of High-Energy Particles and Radiation Production for Multipetawatt Laser Facilities 多拍瓦激光设备高能粒子和辐射产生的建模

IF 0.9 4区物理与天体物理

Laser and Particle Beams Pub Date : 2021-08-11 DOI: 10.1155/2021/3355928

D. Raffestin, D. Batani, J. Caron, J. Baggio, G. Boutoux, P. Nicolaï, J. Feugeas, V. Tikhonchuk, E. D'humieres

引用次数: 1