Physics of Plasmas最新文献_第10页

Diagnosing hot-spot symmetry in surrogate ignition experiments via secondary DT-neutron spectroscopy at the NIF 通过 NIF 的二次 DT 中子光谱诊断代理点火实验中的热点对称性

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-02 DOI: 10.1063/5.0210125

P. J. Adrian, R. Bionta, D. Casey, M. Gatu Johnson, S. Kerr, B. Lahmann, C. K. Li, R. Nora, R. D. Petrasso, G. Rigon, D. Schlossberg, F. H. Séguin, J. A. Frenje

{"title":"Diagnosing hot-spot symmetry in surrogate ignition experiments via secondary DT-neutron spectroscopy at the NIF","authors":"P. J. Adrian, R. Bionta, D. Casey, M. Gatu Johnson, S. Kerr, B. Lahmann, C. K. Li, R. Nora, R. D. Petrasso, G. Rigon, D. Schlossberg, F. H. Séguin, J. A. Frenje","doi":"10.1063/5.0210125","DOIUrl":"https://doi.org/10.1063/5.0210125","url":null,"abstract":"The directional energy spectrum of neutrons generated from the in-flight fusion reaction of 1-MeV tritons contains information about the hot-spot symmetry. The National Ignition Facility (NIF) fields Symmetry Capsule (Symcap) implosions, which have historically measured the symmetry of the radiation, drive by measuring the hot-spot shape via x-ray self-emission. Symcaps are used to tune the hot-spot symmetry for ignition experiments at the NIF. This work shows the relationship between directional secondary DT-n spectra and x-ray imaging data for a large database of Symcap implosions. A correlation is observed between the relative widths of the DT-n spectra measured with nTOFs and the shape measured with x-ray imaging. A Monte Carlo model, which computes the directional secondary DT-n spectrum, is used to interpret the results. A comparison of the x-ray and secondary DT-n data with the Monte Carlo model indicates that 56% of the variance between the two datasets is explained by a P2 asymmetry. More advanced simulations using HYDRA suggest that the unaccounted variance is due to P1 and P4 asymmetries present in the hot spot. The comparison of secondary DT-n data and x-ray imaging data to the modeling shows the DT-n data contain important information that supplements current P2 measurements and contain new information about the P1 asymmetry.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":"84 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141883802","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

SPLEND1D, a reduced one-dimensional model to investigate the physics of plasma detachment SPLEND1D - 用于研究等离子体脱离物理学的简化一维模型

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-02 DOI: 10.1063/5.0202986

O. Février, S. Gorno, C. Theiler, M. Carpita, G. Durr-Legoupil-Nicoud, M. von Allmen

{"title":"SPLEND1D, a reduced one-dimensional model to investigate the physics of plasma detachment","authors":"O. Février, S. Gorno, C. Theiler, M. Carpita, G. Durr-Legoupil-Nicoud, M. von Allmen","doi":"10.1063/5.0202986","DOIUrl":"https://doi.org/10.1063/5.0202986","url":null,"abstract":"Studying the process of divertor detachment and the associated complex interplay of plasma dynamics and atomic physics processes is of utmost importance for future fusion reactors. While simplified analytical models exist to interpret the general features of detachment, they are limited in their predictive power, and complex two-dimensional (2D) or even three-dimensional (3D) codes are generally required to provide a self-consistent picture of the divertor. As an intermediate step, one-dimensional (1D) models of the scrape-off layer (SOL) can be particularly insightful as the dynamics are greatly simplified, while still self-consistently including various source and sink terms at play, as well as additional important effects such as flows. These codes can be used to shed light on the physics at play, to perform fast parameter scans, or to interpret experiments. In this paper, we introduce the SPLEND1D (Simulator of PLasma ENabling Detachment in 1D) code: a fast and versatile 1D SOL model. We present in detail the model that is implemented in SPLEND1D. We then employ the code to explore various elements of detachment physics for parameters typical of the Tokamak à Configuration Variable, including the atomic physics and other processes behind power and momentum losses, and explore the various hypotheses and free parameters of the model.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":"217 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141883801","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

Analysis of communication characteristics of Airy vortex beams in turbulent plasma sheath 湍流等离子鞘中空气涡旋束的通信特性分析

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-02 DOI: 10.1063/5.0194716

Tingwei Sun, Qingqing Deng, Wei Chen, Yong Bo, Lixia Yang, Lixin Guo

{"title":"Analysis of communication characteristics of Airy vortex beams in turbulent plasma sheath","authors":"Tingwei Sun, Qingqing Deng, Wei Chen, Yong Bo, Lixia Yang, Lixin Guo","doi":"10.1063/5.0194716","DOIUrl":"https://doi.org/10.1063/5.0194716","url":null,"abstract":"In this paper, a transmission model of power-exponential Airy vortex beams in plasma turbulence is established based on the random phase screen theory, and the information transmission characteristics of Airy vortex beams are compared under the OOK, BPSK, and DPSK modulation modes in free-space optical communication systems. Bit error rates (BERs) were calculated for different power indices (n), undulation variances (&lt;Δn2&gt;), transmission distances, and anisotropy parameters. In addition, the orbital angular momentum multiplexing of Airy vortex beams in the Line-of-Sight multiple input multiple output system under a plasma turbulence environment is investigated. The spectral efficiency (SE) is analyzed for different signal-to-noise ratio (SNR) and radii of the emitting surface, and the effects of the variation in the system's numerical aperture and the power exponent on the SE and the effective degrees of freedom in space are analyzed. The results show that the Airy beam has better turbulence resistance than the Laguerre–Gaussian beam. The power-exponential Airy beam has better transmission performance than the conventional Airy beam. By increasing the anisotropy parameter, the BER of the system decreases. When the &lt;Δn2&gt; and the transmission distance increase, the BER increases. Increasing the SNR, the radius of the launching surface and the choice of power-exponential Airy beams can improve the channel capacity. These findings provide a theoretical basis for the problem of optical signal propagation in plasma turbulence.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":"190 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141883803","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

Virial relations for elongated plasmas in tokamaks: Analytical approximations and numerical calculations 托卡马克中拉长等离子体的室温关系：分析近似和数值计算

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-02 DOI: 10.1063/5.0221175

A. A. Martynov, V. D. Pustovitov

引用次数: 0

Experiments and gyrokinetic simulations of the nonlinear interaction between spinning magnetized plasma pressure filaments 旋转磁化等离子体压力丝之间非线性相互作用的实验和陀螺动力学模拟

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-02 DOI: 10.1063/5.0213345

R. D. Sydora, T. Simala-Grant, S. Karbashewski, F. Jimenez, B. Van Compernolle, M. J. Poulos

引用次数: 0

Statistical characterization of high voltage vacuum surface flashover with gapped and ungapped anodes 有间隙和无间隙阳极高压真空表面闪蒸的统计特征

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-02 DOI: 10.1063/5.0214059

M. Mounho, C. Fuksa, R. Clark, W. Brooks, M. Hopkins, A. Steiner, A. Neuber, J. Stephens

引用次数: 0

Nonlinear scaling of photon radiation power in relativistic plasma current filamentation instability with beam parameters 相对论等离子体电流丝状不稳定性中光子辐射功率随光束参数的非线性缩放

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-02 DOI: 10.1063/5.0210348

Zhang-Hu Hu, Wen-Yuan Zhai, Jie-Jie Lan, You-Nian Wang

引用次数: 0

The effect of energetic electrons in lunar ionosphere on the streaming plasma instability around moon 月球电离层中的高能电子对月球周围流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 : 2024-08-02 DOI: 10.1063/5.0201367

Vipin K. Yadav, Mahima Agarwal, Mehul Chakraborty, Rajneesh Kumar

{"title":"The effect of energetic electrons in lunar ionosphere on the streaming plasma instability around moon","authors":"Vipin K. Yadav, Mahima Agarwal, Mehul Chakraborty, Rajneesh Kumar","doi":"10.1063/5.0201367","DOIUrl":"https://doi.org/10.1063/5.0201367","url":null,"abstract":"The analytical study of the two-stream instability (TSI) generation is carried out in the lunar ionosphere. The solar wind is considered an electron beam, which interacts with the lunar ionosphere, generated due to the photoionization of the lunar neutrals by the extreme ultraviolet component of the solar radiation. In this interaction process, the lunar electrons constitute the background plasma as the ion population is considerably low in the lunar plasma environment. In the present study along with the non-energetic (“cold”) electrons, which are in the majority, a fraction of energetic electrons (“hot”) of the total lunar electron population are also considered and the fraction of energetic electrons is taken in the range of 1%–25% of the total lunar electron count. The particle-in-cell simulations suggest that the presence of energetic electrons in the lunar plasma environment hastens the electron bunching during the interaction with the incoming solar wind electrons during the TSI. The energetic electrons in the lunar plasma environment are capable of triggering non-linear phenomena, such as the generation of lunar plasma waves. The inclusion of hot electrons in the lunar plasma ambiance changes the scenario for the TSI to occur in the lunar ionosphere, and the analysis shows that it modifies the TSI dispersion relation and can have a significant impact on the growth and decay of the TSI and its threshold for generation in a lunar plasma environment.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":"80 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-08-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141883809","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

Characteristics and mechanism of low-field peak in argon helicon plasma of single loop antenna 单环天线氩氦等离子体低场峰的特征和机制

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-01 DOI: 10.1063/5.0213521

Zhangyu Xia, Tianliang Zhang, Ying Cui, Bocong Zheng, Jiting Ouyang

{"title":"Characteristics and mechanism of low-field peak in argon helicon plasma of single loop antenna","authors":"Zhangyu Xia, Tianliang Zhang, Ying Cui, Bocong Zheng, Jiting Ouyang","doi":"10.1063/5.0213521","DOIUrl":"https://doi.org/10.1063/5.0213521","url":null,"abstract":"Low magnetic field density peak (LFP) is a typical nonlinear phenomenon in helicon wave discharge, which is characterized by the nonlinear increase in electron density with the magnetic field in lower magnetic fields. In this paper, the characteristics and generation mechanism of LFPs of argon helicon wave plasma excited by m = 0 single-loop antenna are studied by experiment and numerical simulation. Experimental results show that plasma density shows two peaks at increasing magnetic field in the range of 0–100 G. The first peak appears around 10 G, and the second one appears between 30 and 50 G. The peak density is related to gas pressure, radio frequency power, and tube dimension. From B-dot measurement, there exists obvious helicon wave structure in plasma at field strength around the LFP, with component of standing wave. Theoretical analysis demonstrated that the first density peak occurs on the demarcation line in density-magnetic field map where the H-wave limited by radial boundary condition begins to propagate, while the second peak is due to the fact that the axial wavenumber of H-wave decreases gradually with the increased magnetic field and the heating effect by standing wave resonance coupling is weakened above a critical magnetic field, leading to a sudden decrease in plasma density. Simulation by HELIC code shows that the change of radial distribution of power deposition reflects the conversion of heating mechanism from single TG-wave mode to H-TG wave coupled mode heating in low magnetic fields. The axial wavenumber with the maximum absorbed power decreases with the increased magnetic field, corresponding to the change of wave structure.","PeriodicalId":20175,"journal":{"name":"Physics of Plasmas","volume":"217 1","pages":""},"PeriodicalIF":2.2,"publicationDate":"2024-08-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"141883810","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

Refractive channeling of heating wave driven by laser beam interaction with plasma of subcritical density 激光束与亚临界密度等离子体相互作用产生的加热波折射通道

IF 2.2 3区物理与天体物理

Physics of Plasmas Pub Date : 2024-08-01 DOI: 10.1063/5.0194806

S. Yu. Gus'kov, P. A. Kuchugov, N. N. Demchenko

引用次数: 0