2022 IEEE International Conference on Plasma Science (ICOPS)最新文献_第3页

Intense Laser-Driven Mev X-Ray Radiography 强激光驱动Mev x射线摄影

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/icops45751.2022.9813272

S. Palaniyappan, D. Gautier, B. Albright, L. Yin, D. Stark, J. Hunter, S. Luedetke, J. Strehlow

引用次数: 0

Measurement Method for Electric Field in Streamer Discharge Based on Electric-Field-Induced Second-Harmonic Generation 基于电场感应二次谐波的流线放电电场测量方法

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813189

S. Nakamura, M. Sato, T. Fujii, A. Kumada

{"title":"Measurement Method for Electric Field in Streamer Discharge Based on Electric-Field-Induced Second-Harmonic Generation","authors":"S. Nakamura, M. Sato, T. Fujii, A. Kumada","doi":"10.1109/ICOPS45751.2022.9813189","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9813189","url":null,"abstract":"Electric-field measurement based on the electric-field-induced second-harmonic generation (E-FISHG) method is a highly desirable tool for a noninvasive field measurement in plasmas and gases. Several papers, including ours, have pointed out and discussed the fact that the SHG signal is affected by the field length along a laser path [1] , [2] . Therefore, it is necessary to use an appropriate optical geometry depending on the target. In this paper, we examine an electric-field measurement method to a streamer discharge. We consider the case where one measures a field in the streamer discharge with a diameter of several hundred µm. We assume that the streamer discharge propagates along z axis with good reproducibility. We verify that if one acquires the signal profile along the x axis using cylindrical lenses, one can restore the field profile from the signal by performing the Abel transformation. Furthermore, we explore optical conditions under which one can obtain the maximum field value along the laser path; we elucidate the optimal Rayleigh length and calibration electrode shape and size. We also clarify how to measure the field profile in the streamer discharge using our proposed field restoration method.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114860076","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}

引用次数: 0

Performance of Multipactor Coatings Applied Using Atomic Layer Deposition 原子层沉积多因子涂层的性能研究

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9812962

R. Ives, C. Oldham, M. Gilmore, I. Kern

{"title":"Performance of Multipactor Coatings Applied Using Atomic Layer Deposition","authors":"R. Ives, C. Oldham, M. Gilmore, I. Kern","doi":"10.1109/ICOPS45751.2022.9812962","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9812962","url":null,"abstract":"Multipactor emission can be as serious problem for high power RF devices, particularly RF windows. It can lead to destructive heating of the ceramic or arcing on the window surface. This is typically addressed by sputtering a thin layer of titanium nitride on the vacuum side of the window ceramic. This works well for relatively small ceramics but leads to poor uniformity over large surfaces. High power RF windows are required at 704 MHz, which require windows approximately 23 inches in diameter. This is larger than can be reliably coated using sputtering. This research is developing technology to apply Multipactor suppression coatings using Atomic Layer Deposition (ALD), which provides unprecedented control of the coating thickness and uniformity. It is independent of surface area and allows coating of multiple surfaces in parallel, with associated cost reduction. In addition, ALD bonding is stronger than that provided by sputtering, leading to more robust protection. This presentation will describe the ALD system and process. Test structures were fabricated, and the RF loss and secondary electron yield were measured. The measurement system and results will also be presented.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"20 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126306044","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}

引用次数: 0

Enhanced Experimental Techniques to Increase the Current in a Thermionic Emission Physical Plasma System for Practical Applications 在实际应用中增加热离子发射物理等离子体系统电流的强化实验技术

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813041

A. Hala

{"title":"Enhanced Experimental Techniques to Increase the Current in a Thermionic Emission Physical Plasma System for Practical Applications","authors":"A. Hala","doi":"10.1109/ICOPS45751.2022.9813041","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9813041","url":null,"abstract":"The thermionic emission phenomenon is often overlooked when it comes to implementing practical applications using physical plasma discharges even though it can be more important than the photovoltaic effect for instance [1] . The reason for this little interest is the existence of the space charge effect that limits the current flowing from the plasma discharge cathode toward the anode when more current is needed for practical applications [2] . This contribution reviews experimental techniques used to overcome this limiting space charge effect in a thermionic emission plasma system allowing for a substantial current to flow toward the anode. These experimental techniques include leaking chemical impurities to the plasma system and changing certain anode conditions [3] . In addition, a Langmuir probe is to be used and operated in the \"charge collection\" mode to map the electric field trajectories between the cathode and the anode with a size that is much smaller than the plasma chamber size [4] . This ensures minimal distortions of the measured physical plasma system electric field. Further, it will be demonstrated that the current drawn using these techniques is sufficient to be applied in important plasma applications such as the sputtering of metal targets to produce metal fine powders [5] .","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"87 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126315590","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}

引用次数: 0

Density Functional Theory Calculations Coupled with Monte Carlo Simulations for Prediction of Secondary Electron Yield from Metals, Alloys and Metal Oxides 密度泛函理论计算与蒙特卡罗模拟相结合预测金属、合金和金属氧化物的二次电子产率

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813352

R. Gutierrez, I. Gonzales, M. Polak, D. Morgan, E. Schamiloglu

引用次数: 0

Characterization and Treatment Performance of a Spinning Disk Reactor Operated by an Atmospheric Pressure Plasma Jet 常压等离子体射流旋转圆盘反应器的特性与处理性能

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813060

F. J. Ganzallo, M. Vasilev, X. Su, S. Yatom, S. M. Thagard

引用次数: 0

Modeling Plasma Physics in the Z-Pinch Fusion Concept 在Z-Pinch聚变概念中建模等离子体物理

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813346

E. Meier, U. Shumlak

{"title":"Modeling Plasma Physics in the Z-Pinch Fusion Concept","authors":"E. Meier, U. Shumlak","doi":"10.1109/ICOPS45751.2022.9813346","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9813346","url":null,"abstract":"A computational modeling program is under way at Zap Energy to explore the plasma physics of sheared-flow-stabilized Z-pinch fusion reactor technology. The WARPXM high-order discontinuous Galerkin modeling framework developed at U. Washington is the primary computational tool. Using a two-fluid model, linear and nonlinear stages of m=0 and m=1 Z-pinch instabilities are simulated in a short axial segment of the Z-pinch plasma, beginning from Bennett equilibrium profiles. Results suggest that although linear stability may not be easily achieved, a system that begins with sufficient equilibrium sheared flow undergoes nonlinear relaxation, leading to a quasi-equilibrium state that may approximate experimental reality. In addition to two-fluid modeling focused on local plasma stability, an MHD-based multi-fluid model is under development for simulating an entire Z-pinch discharge, including gas injection, breakdown, pinch formation, and sustainment via deflagration and entrainment of residual gas in the coaxial acceleration region. The high-order approach employed in WARPXM is arithmetically intensive and suitable to GPU acceleration, and plans in that direction will be discussed. GPU-accelerated continuum kinetic modeling is of particular interest, and may be applied in a whole-device-modeling framework in regions where plasma distributions are non-Maxwellian.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"117 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131955425","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}

引用次数: 0

A Pulse Length and Intensity Study of Proton Generation from Microtube Foil Targets 微管箔靶质子生成的脉冲长度和强度研究

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/icops45751.2022.9813132

J. Strehlow, M. Bailly-Grandvaux, J. Kim, S. Bolaños, H. Smith, C. Aniculaesei, H. Chen, T. Ditmire, M. Donovan, A. Haid, E. Alfonso, B. Hegelich, T. Ma, H. Mclean, H. Quevedo, M. Spinks, F. Beg

{"title":"A Pulse Length and Intensity Study of Proton Generation from Microtube Foil Targets","authors":"J. Strehlow, M. Bailly-Grandvaux, J. Kim, S. Bolaños, H. Smith, C. Aniculaesei, H. Chen, T. Ditmire, M. Donovan, A. Haid, E. Alfonso, B. Hegelich, T. Ma, H. Mclean, H. Quevedo, M. Spinks, F. Beg","doi":"10.1109/icops45751.2022.9813132","DOIUrl":"https://doi.org/10.1109/icops45751.2022.9813132","url":null,"abstract":"Intense lasers interacting with solid foils can drive ~TV/m electric fields, accelerating ions to MeV energies. Simulations and experimental data [1] , [2] show that the ion energies and numbers can increase using structured targets. In this study, we experimentally observe that structured targets can dramatically enhance proton acceleration in the target normal sheath acceleration (TNSA) regime. At the Texas Petawatt Laser, we compared proton acceleration from a 1µm Ag flat foil, to microtube structures 3D printed on the front side of Ag foils. A pulse length (140 – 500 fs) and intensity ( [6 – 20] ×10 20 W/cm 2 ) study optimized laser parameters, where microtube targets increase the proton cutoff energy by ~2× and the energetic proton yield (>1.5 MeV) by ~3×. Radiation-hydrodynamic simulations indicate that for sufficiently high laser energy, the pre-pulse shutters the microtubes with an overcritical plasma, damping their performance, in good agreement with the experimental optimum. 2D EPOCH simulations are performed, with and without the pre-plasma profile imported, to better understand the coupling of laser energy to the microtube targets.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"s3-36 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130160841","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}

引用次数: 0

Imaging of Defects in Additively Manufactured Alloys Using Betatron X-Rays 增材制造合金缺陷的电子射线成像

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813025

V. Senthilkumaran, N. Beier, P. Shabaninezhad, J. Stinehart, S. Fourmaux, T. Richards, A. Arce-Borkent, S. Meschian, S. Knudsen, M. Lipsett, L. Zhou, J. Moore, A. Hussein

引用次数: 0

Hot Electron Generation and Laser–Plasma Instabilities in Shock Ignition Relevant Experiments 激波点火实验中热电子的产生和激光等离子体的不稳定性

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9812983

A. Raymond, C. Krauland, E. Hahn, J. Kim, F. Beg, N. Alfonso, S. Fess, J. Peebles, M. Wei, W. Theobald, J. Palastro, C. Ren, C. Stoeckl, D. Haberberger, T. Filkins, J. Katz, A. Hansen, D. Turnbull, R. Betti, R. Follett, M. Campbell, J. Trela, D. Batani, R. Scott, L. Antonelli

{"title":"Hot Electron Generation and Laser–Plasma Instabilities in Shock Ignition Relevant Experiments","authors":"A. Raymond, C. Krauland, E. Hahn, J. Kim, F. Beg, N. Alfonso, S. Fess, J. Peebles, M. Wei, W. Theobald, J. Palastro, C. Ren, C. Stoeckl, D. Haberberger, T. Filkins, J. Katz, A. Hansen, D. Turnbull, R. Betti, R. Follett, M. Campbell, J. Trela, D. Batani, R. Scott, L. Antonelli","doi":"10.1109/ICOPS45751.2022.9812983","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9812983","url":null,"abstract":"Shock ignition (SI) is an inertial confinement fusion schema that uses a strong convergent shock driven by a high intensity ~10 16 W/cm 2 laser pulse to ignite a pre-compressed fusion capsule. Understanding nonlinear laser-plasma instabilities and hot electron generation is critical towards maximizing the coupling of laser energy into the target during both the high intensity and plasma formation pulses. A series of experiments on the OMEGA EP and OMEGA-60 laser facilities have explored a variety of regimes relevant to shock ignition, with experimental parameters informed iteratively by radiation hydrodynamic simulations and previous experiments. Characterization of a coronal plasma with and without a sequential high intensity pulse was performed utilizing Thomson scattering on OMEGA 60 at variable focal standoff from the initial target surface between 300 – 1100 μm, corresponding to plasma densities between n crit to n crit /10. High intensity laser coupling was additionally studied using backscatter spectrum diagnostics. Derived results will be presented and compared to hydrodynamic simulation results. In addition, simultaneously collected shock breakout measurements are presented using VISAR and SOP diagnostic techniques and are additionally compared to expectations. Such validations of simulation results will aid to inform future experiments conducted in this regime, while the data reveals further insights into the underlying dynamics pivotal to the shock ignition concept.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"35 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131644751","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}

引用次数: 0