Physics of Plasmas最新文献_第5页

The singlet S-wave resonances of He atom in dense quantum plasmas 高密度量子等离子体中 He 原子的单 S 波共振

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-28 DOI: 10.1063/5.0217126

Tian Dong, Yong Zhi Zhang, Aihua Liu, Yew Kam Ho, Li Guang Jiao

引用次数: 0

Proton beams generated via thermonuclear deuterium–deuterium fusion by means of modified cavity pressure acceleration-type targets as a candidate for proton–boron fusion driver 通过改良腔压加速型靶件热核氘-氘聚变产生质子束，作为质子-硼聚变驱动器的候选靶件

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-27 DOI: 10.1063/5.0207108

P. Tchórz, T. Chodukowski, M. Rosiński, S. Borodziuk, M. Szymański, R. Dudžák, S. Singh, M. Krupka, T. Burian, A. Marchenko, M. Kustosz, S. Agarwal

引用次数: 0

Multipactor analysis of 431 MHz L-shaped inductive output tube cavity 431 MHz L 型电感式输出管腔的多因子分析

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-27 DOI: 10.1063/5.0217471

Muhammad Khawar Nadeem, Shaomeng Wang, Atif Jameel, Bilawal Ali, Jibran Latif, Yubin Gong

{"title":"Multipactor analysis of 431 MHz L-shaped inductive output tube cavity","authors":"Muhammad Khawar Nadeem, Shaomeng Wang, Atif Jameel, Bilawal Ali, Jibran Latif, Yubin Gong","doi":"10.1063/5.0217471","DOIUrl":"https://doi.org/10.1063/5.0217471","url":null,"abstract":"Gridless inductive output tubes (IOTs) offer compact size and high-power amplification at sub-GHz frequencies. Minimizing cavity dimensions in the interest of compactness leads to smaller gaps, which may cause multipactor discharge under high-power operating conditions. The uncontrolled electron growth resulting from multipactor breakdown can lead to undesired effects including surface damage and system failure. This paper performs a parallel-plate multipactor analysis for a high-Q, L-shaped, aluminum, 431 MHz cavity designed for a gridless IOT to be operated in the MW-power regime. The cavity gap is 27 mm, and diameter is 339 mm. Multipactor susceptibility regions are calculated for non-zero emission energy, half-cycle, and non-half-cycle multipactor using a semi-analytic approach and a standard aluminum secondary electron yield (SEY) curve. The analytical results are validated with particle-in-cell simulation in CST Studio. Simulation results show a voltage range of 6.4–19 kV, compared to the analytically calculated values of 8.2 and 18.3 kV for the lower and upper bounds, respectively. Fluorocarbon coating as a means to reduce secondary electron emission is simulated, which shows 46% reduction in peak particle population with an 11.2 nm PTFE coating, with further reduction as coating thickness increases. The results show that the L-shaped cavity is a suitable choice for this IOT design as it does not exhibit single-surface multipactor and will not develop two-surface multipactor at full-power operation.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221866","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Characterization of similar Marshak waves observed at the LMJ 在 LMJ 观测到的类似马沙克波的特征

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-27 DOI: 10.1063/5.0216671

C. Courtois, R. Gisbert, R. Botrel, A. Chaleil, L. Chopineau, S. Debesset, J. Fariaut, O. Henry, L. Le Déroff, B. Loupias, A. Rousseau, G. Soullie, B. Villette

{"title":"Characterization of similar Marshak waves observed at the LMJ","authors":"C. Courtois, R. Gisbert, R. Botrel, A. Chaleil, L. Chopineau, S. Debesset, J. Fariaut, O. Henry, L. Le Déroff, B. Loupias, A. Rousseau, G. Soullie, B. Villette","doi":"10.1063/5.0216671","DOIUrl":"https://doi.org/10.1063/5.0216671","url":null,"abstract":"We detail results of two experiments performed at the Laser Mégajoule (LMJ) facility aimed at studying similar supersonic Marshak waves propagating in a low-density SiO2 aerogel enclosed in metallic tubes. Similar means here that these two experiments, driven by the same input radiation temperature history, use purposely very different tubes in terms of length (L = 1200 or 2000 μm), diameter (2R = 1000 or 2000 μm), nature of the wall (gold or copper), and aerogel densities (ρ = 30 or 20 mg/cm3), yet the transit time and the radiation temperature of the fronts at the tube exit are the same for both shots. Marshak waves are characterized at the exit using simultaneously for the first time to our knowledge, a one dimensional soft x-ray imager from which the radiation front transit time and curvature are measured and also a broadband x-ray spectrometer to infer its temperature history. These constraining results are then successfully compared to those from simple analytical models [Cohen et al., Phys. Rev. Res. 2, 023007 (2020) and Hurricane et al., Phys. Plasmas 13, 113303 (2006)] and from the three dimensional Lagrangian radiation-hydrodynamics code TROLL to get information on x-ray energy losses. Controlled compensation effects between the length, diameter, and nature of the tubes (governing these losses) are such that the radiation temperature drop along the tubes is eventually the same for these two similar shots.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-27","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221867","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Mining experimental magnetized liner inertial fusion data: Trends in stagnation morphology 挖掘磁化衬垫惯性聚变实验数据：停滞形态趋势

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-26 DOI: 10.1063/5.0206222

William E. Lewis, David A. Yager-Elorriaga, Christopher A. Jennings, Jeffrey R. Fein, Gabriel A. Shipley, Andrew Porwitzky, Thomas J. Awe, Matthew R. Gomez, Eric C. Harding, Adam J. Harvey-Thompson, Patrick F. Knapp, Owen M. Mannion, Daniel E. Ruiz, Marc-Andre Schaeuble, Stephen A. Slutz, Matthew R. Weis, Jeffrey Woolstrum, David J. Ampleford, Luke Shulenburger

{"title":"Mining experimental magnetized liner inertial fusion data: Trends in stagnation morphology","authors":"William E. Lewis, David A. Yager-Elorriaga, Christopher A. Jennings, Jeffrey R. Fein, Gabriel A. Shipley, Andrew Porwitzky, Thomas J. Awe, Matthew R. Gomez, Eric C. Harding, Adam J. Harvey-Thompson, Patrick F. Knapp, Owen M. Mannion, Daniel E. Ruiz, Marc-Andre Schaeuble, Stephen A. Slutz, Matthew R. Weis, Jeffrey Woolstrum, David J. Ampleford, Luke Shulenburger","doi":"10.1063/5.0206222","DOIUrl":"https://doi.org/10.1063/5.0206222","url":null,"abstract":"In magnetized liner inertial fusion (MagLIF), a cylindrical liner filled with fusion fuel is imploded with the goal of producing a one-dimensional plasma column at thermonuclear conditions. However, structures attributed to three-dimensional effects are observed in self-emission x-ray images. Despite this, the impact of many experimental inputs on the column morphology has not been characterized. We demonstrate the use of a linear regression analysis to explore correlations between morphology and a wide variety of experimental inputs across 57 MagLIF experiments. Results indicate the possibility of several unexplored effects. For example, we demonstrate that increasing the initial magnetic field correlates with improved stability. Although intuitively expected, this has never been quantitatively assessed in integrated MagLIF experiments. We also demonstrate that azimuthal drive asymmetries resulting from the geometry of the “current return can” appear to measurably impact the morphology. In conjunction with several counterintuitive null results, we expect the observed correlations will encourage further experimental, theoretical, and simulation-based studies. Finally, we note that the method used in this work is general and may be applied to explore not only correlations between input conditions and morphology but also with other experimentally measured quantities.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221868","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Propagation characteristics of obliquely incident terahertz waves in inhomogeneous microplasma 斜入射太赫兹波在不均匀微等离子体中的传播特性

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-26 DOI: 10.1063/5.0216378

Lei Zhang, Lingzhao Ji, Yuexing Zhao, Ruiming Su, Guokai Yi, Yuren Shi

引用次数: 0

Statistical description of interacting multistream quantum systems 相互作用的多流量子系统的统计描述

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-26 DOI: 10.1063/5.0216478

M. Akbari-Moghanjoughi

{"title":"Statistical description of interacting multistream quantum systems","authors":"M. Akbari-Moghanjoughi","doi":"10.1063/5.0216478","DOIUrl":"https://doi.org/10.1063/5.0216478","url":null,"abstract":"In this research, the electrostatically coupled multistream quasiparticle excitations are studied in the framework of the Wigner distribution function. It is remarked that the Wigner distribution of coupled multistream collective quantum excitations satisfies a simple Liouville-like evolution equation from which a generalized distribution function for multistream quasiparticle excitations is deduced. The phase-space structure of collective quantum excitations in counter-stream electron and two-stream electron–positron gas with their evolution is calculated and electron/positron hole formation due to the onset of quantum stream instability is studied in connection with the energy band structure of the multistream quantum system, for the first time. The quantum stream instabilities in symmetric and asymmetric stream systems are studied and compared. It is found that the presence of opposite-charge streams leads to overall stability due to lowering the interaction potential effect. The generalized Wigner theory is also applied to study the electron transport in a one-dimensional periodic lattice using the concept of virtual streams. Current generalized statistical formalism may be used to model different quantum phenomena in the linear excitations limit with collective electrostatic interactions. The applications extend to the stream instability in quantum charge transport in metals, semiconductors, plasmonic devices, phase-space structure of charge carriers in periodic lattices interacting with the external potential of arbitrary shape and the dynamic evolution of dense electron–positron jets in active galactic nuclei or within the extremely dense astrophysical objects.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221871","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Exploring relaxation dynamics in warm dense plasmas by tailoring non-thermal electron distributions with a free electron laser 用自由电子激光器定制非热电子分布，探索暖致密等离子体中的弛豫动力学

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-23 DOI: 10.1063/5.0217826

Y.-F. Shi, S. Ren, H.-K. Chung, J. S. Wark, S. M. Vinko

引用次数: 0

Initial imprint effect on dynamic mitigation of plasma instability 初始印记对动态缓解等离子体不稳定性的影响

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-23 DOI: 10.1063/5.0225109

S. Kawata

{"title":"Initial imprint effect on dynamic mitigation of plasma instability","authors":"S. Kawata","doi":"10.1063/5.0225109","DOIUrl":"https://doi.org/10.1063/5.0225109","url":null,"abstract":"We proposed a dynamic mitigation method for plasma instabilities based on a phase control to mitigate plasma instabilities and to smooth plasma non-uniformities [e.g., Phys. Plasmas, 19 (2012), 024503]. In plasmas, perturbation phase would be unknown in general, and instability growth rate is discussed. However, if the perturbation is introduced by, for example, an illumination non-uniformity of an input energy driver beam, the perturbation phase would be defined by the driver illumination non-uniformity itself. When the driver axis is controlled by its axis oscillation or wobbling motion, the perturbation phase would be known and controlled. By the superimposition of the growing phase-controlled perturbations, the overall plasma instability growth is mitigated. The dynamic mitigation method is effective to mitigate growths of various plasma instabilities. At the same time, it was found that the phase of the growing perturbations mitigated would be still defined by the initial imprint. In this paper, the initial imprint effect is focused on the dynamic mitigation mechanism in plasmas. The results in this paper demonstrate that the initial imprint effect is reduced by an appropriate pulse shaping of the oscillating or wobbling perturbation.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221897","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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

Formation of cylindrical plasma equilibria with β > 1 形成 β > 1 的圆柱形等离子体平衡态

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-23 DOI: 10.1063/5.0216073

I. V. Timofeev, V. A. Kurshakov, E. A. Berendeev

{"title":"Formation of cylindrical plasma equilibria with β > 1","authors":"I. V. Timofeev, V. A. Kurshakov, E. A. Berendeev","doi":"10.1063/5.0216073","DOIUrl":"https://doi.org/10.1063/5.0216073","url":null,"abstract":"High-beta plasma equilibria are realized in a number of physical systems, from planetary magnetospheres, sunspots, and magnetic holes to fusion laboratory experiments. When plasma pressure becomes large enough to completely expel the magnetic field from its volume, the particle trajectories cannot be considered any more as circular gyro-orbits, and plasma pressure ceases to be gyrotropic. These non-gyrotropic effects require kinetic description and are actively studied for a long time in the magnetic reconnection problem. In this paper, we will show that non-gyrotropy of plasma pressure makes it possible to markedly exceed the limit β=1 dictated by the magnetohydrodynamics for finite-size plasmas, which may be attractive for some fusion schemes such as mirror and cusp configurations. As a first step, we study how these effects manifest themselves in a simple classical problem of confining a cylindrical plasma column by a uniform vacuum magnetic field. Using particle-in-cell simulations, we show that the equilibrium of the diamagnetic bubble type with zero internal magnetic field is formed with an electron-produced current layer of sub-ion scale and found that the gas-kinetic pressure of the central plasma exceeds the pressure of the vacuum magnetic field by 15%.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":null,"pages":null},"PeriodicalIF":2.2,"publicationDate":"2024-08-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142221896","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":3,"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