Plasma Research Express最新文献_第2页

Reply to ‘Commentary on Mapping the electric field vector of guided ionization waves at atmospheric pressure, (2020) Plasma Res. Express 2 025014)’ 对“大气压力下引导电离波电场矢量映射的评论”的答复，(2020)等离子体学报，2 025014)

Plasma Research Express Pub Date : 2022-03-01 DOI: 10.1088/2516-1067/ac61c2

S. Iséni

引用次数: 1

Characteristic behaviour of N-order ion acoustic rogue waves solution in electron-positron-ion plasmas 正负电子等离子体中N阶离子声波解的特征行为

Plasma Research Express Pub Date : 2022-01-28 DOI: 10.1088/2516-1067/ac4bea

M. Alam, M. Talukder

{"title":"Characteristic behaviour of N-order ion acoustic rogue waves solution in electron-positron-ion plasmas","authors":"M. Alam, M. Talukder","doi":"10.1088/2516-1067/ac4bea","DOIUrl":"https://doi.org/10.1088/2516-1067/ac4bea","url":null,"abstract":"The characteristic behaviour of breathers as well as N-order Rogue wave (RW) solution in homogeneous unmagnetized electron-positron-ion plasmas (consisting of cold ions, and isothermal Maxwellian electrons and positrons) has been studied theoretically. Nonlinear Schrödinger (NLS) equation is derived employing Krylov-Bogoliubov-Mitropolosky (KBM) perturbation technique in solving the concerned problems. The analytical solution of the NLS equation in the forms of breathers such as Akhmediev breather (AB), Kuznetsov-Ma breather (KM) solitons, as well as first-, second-, third-, and fourth-order RWs solution are obtained. The characteristic behaviour of breathers’ and their dependency on the relevant physical parameters are examined. The different orders of RWs are analyzed to obtain the region of existence of ion acoustic (IA) rogue waves (IARWs) with respect to unstable region. The potential profiles concerning different orders of RWs depend on the ratio of positron to electron concentrations ( ρ ) and wave number ( k ). Analysis reveals that the spatial difference between the two adjacent peaks of AB profiles are increasing with the enhancement of transformer physical parameter ( Λ ), while the temporal evolution between the two neighboring peaks of KM profiles decreases with increasing Λ and the amplitudes become large as well. The amplitudes of first-, second-, and third-order RWs profiles are decreasing with increasing ρ while the amplitude of fourth-order RWs profile is increasing. The results obtained in this study may be useful in understanding the propagation of nonlinear waves in optical fibers, Bose-Einstein condensates, plasma physics and atmospheric physics.","PeriodicalId":36295,"journal":{"name":"Plasma Research Express","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47941140","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: 2

New procedure to estimate plasma parameters through the q-Weibull distribution by using a Langmuir probe in a cold plasma 用Langmuir探针在冷等离子体中通过q-Weibull分布估计等离子体参数的新方法

Plasma Research Express Pub Date : 2022-01-26 DOI: 10.1088/2516-1067/ac4f35

F. J. Gonzalez, J. I. Gonzalez, S. Soler, C. Repetto, B. J. Gómez, D. Berdichevsky

{"title":"New procedure to estimate plasma parameters through the q-Weibull distribution by using a Langmuir probe in a cold plasma","authors":"F. J. Gonzalez, J. I. Gonzalez, S. Soler, C. Repetto, B. J. Gómez, D. Berdichevsky","doi":"10.1088/2516-1067/ac4f35","DOIUrl":"https://doi.org/10.1088/2516-1067/ac4f35","url":null,"abstract":"We describe a procedure to obtain the plasma parameters from the I-V Langmuir curve by using the Druyvesteyn equation. We propose to include two new parameters, q and r, to the usual plasma parameters: plasma potential (V p ), floating potential (V f ), electron density (n), and electron temperature (T). These new parameters can be particularly useful to represent non-Maxwellian distributions. The procedure is based on the fit of the I-V Langmuir curve with the q-Weibull distribution function, and is motivated by recent works which use the q-exponential distribution function derived from Tsallis statistics. We obtain the usual plasma parameters employing three techniques: the numerical differentiation using Savitzky Golay (SG) filters, the q-exponential distribution function, and the q-Weibull distribution function. We explain the limitations of the q-exponential function, where the experimental data V > V p needs to be trimmed beforehand, and this results in a lower accuracy compared to the numerical differentiation with SG. To overcome this difficulty, the q-Weibull function is introduced as a natural generalization to the q-exponential distribution, and it has greater flexibility in order to represent the concavity change around V p . We apply this procedure to analyze the measurements corresponding to a nitrogen N 2 cold plasma obtained by using a single Langmuir probe located at different heights from the cathode. We show that the q parameter has a very stable numerical value with the height. This work may contribute to clarify some advantages and limitations of the use of non-extensive statistics in plasma diagnostics, but the physical interpretation of the non-extensive parameters in plasma physics remains not fully clarified, and requires further research.","PeriodicalId":36295,"journal":{"name":"Plasma Research Express","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44427538","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: 2

B-dot probe measurements on plasma plume expansion across the magnetic field b点探针测量等离子体羽流在磁场中的膨胀

Plasma Research Express Pub Date : 2022-01-20 DOI: 10.1088/2516-1067/ac4d87

N. Behera, R. K. Singh, G. Prakash, K. Patel, H. Joshi, Ajai Kumar

{"title":"B-dot probe measurements on plasma plume expansion across the magnetic field","authors":"N. Behera, R. K. Singh, G. Prakash, K. Patel, H. Joshi, Ajai Kumar","doi":"10.1088/2516-1067/ac4d87","DOIUrl":"https://doi.org/10.1088/2516-1067/ac4d87","url":null,"abstract":"Time-varying diamagnetism in laser-produced plasma moving across a transverse magnetic field for different field strengths has been studied using fast imaging and magnetic probe. The emphasis of the present work is on the development of suitable B-dot probe, quantitative analysis of induced diamagnetic field in an expanding plasma plume and its effect on the applied magnetic field profiles. A Helmholtz coil with pulsed power system is used to produce uniform magnetic field varying from 0.13 T to 0.57 T. Helmholtz coil allows the plume imaging along the magnetic field lines, which gives the direct structural information of the induced diamagnetic cavity. A high frequency three-axis B-dot probe has been developed to measure the transient magnetic field. Different experimental approaches have been used to test the response, sensitivity and calibration of the developed probe. It has been observed that induced magnetic field displaced the external magnetic field that is plasma plume shows the diamagnetic behaviour for considered magnetic field range. The probe signals in directions orthogonal to the applied/induced magnetic lines are correlated with the distortion in applied magnetic field in three dimensional space, which is consistent with recently simulated topology of external magnetic field in similar experimental conditions [Patel et al, 2021 Plasma Phys. Control. Fusion 63 115020 ].","PeriodicalId":36295,"journal":{"name":"Plasma Research Express","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"42558003","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

Instabilities in magnetized inhomogeneous dusty plasmas with the effect of recombination 磁化非均匀尘埃等离子体的不稳定性与复合效应

Plasma Research Express Pub Date : 2022-01-01 DOI: 10.1088/2516-1067/ac728a

Shachi Pachauri, Jyoti, K. Misra

{"title":"Instabilities in magnetized inhomogeneous dusty plasmas with the effect of recombination","authors":"Shachi Pachauri, Jyoti, K. Misra","doi":"10.1088/2516-1067/ac728a","DOIUrl":"https://doi.org/10.1088/2516-1067/ac728a","url":null,"abstract":"An analytical formalism to understand the impact of various parameters on evolving instabilities in inhomogeneous collisional dusty plasmas is presented here under the effect of recombination. The basic fluid dynamics for electrons and singly charged cold ions is carried out including recombination and collision at constant rate at the surface of dust particles. Dust particles are considered to be static with unperturbed density. Normal mode analysis method has been used along with linear approximation to get perturbed densities (n i1, n e1) which are used along with quasi-neutrality condition to get perturbed potential (φ1), using Poisson’s equation to obtain dispersion relation. While other authors have detected instabilities in unmagnetized plasmas, here this method has been successfully realized in presence of static magnetic field at various propagation angle and allowed the straightforward calculation of growth rates of observed instability. An extensive study of the unstable modes has been done which are well discriminated and plotted with respect to different plasma parameters like dust charge, dust density, propagation angle, magnetic field, electrostatic potential along with plasma oscillation wavelength to Debye wavelength ratio. We have observed in the said model that the presence of dust particles and propagation angle of applied magnetic field are affecting significantly the growth rate of instability as compared to magnetic field and recombination.","PeriodicalId":36295,"journal":{"name":"Plasma Research Express","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-01-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"61181769","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: 1

Guided acceleration of nanoparticles by laser irradiated parallel gold nanorods 激光辐照平行金纳米棒引导纳米粒子加速

Plasma Research Express Pub Date : 2021-12-02 DOI: 10.1088/2516-1067/ac3fa3

M. Yadav, Ajay Kumar, Subhayan Mandal

引用次数: 1

Flow behind the magnetogasdynamical cylindrical shock wave in rotating non-ideal dusty gas with monochromatic radiation 单色辐射下旋转非理想含尘气体中磁气体动力学圆柱激波后的流动

Plasma Research Express Pub Date : 2021-11-23 DOI: 10.1088/2516-1067/ac3c4d

P. Sahu

引用次数: 3

Features of ion generation by a picosecond laser in the range of 1011–1013 W cm−2 power densities 1011–1013 W cm−2功率密度范围内皮秒激光器产生离子的特征

Plasma Research Express Pub Date : 2021-11-03 DOI: 10.1088/2516-1067/ac3628

S. Kondrashev, E. Beebe, T. Kanesue, M. Okamura, R. Scott

{"title":"Features of ion generation by a picosecond laser in the range of 1011–1013 W cm−2 power densities","authors":"S. Kondrashev, E. Beebe, T. Kanesue, M. Okamura, R. Scott","doi":"10.1088/2516-1067/ac3628","DOIUrl":"https://doi.org/10.1088/2516-1067/ac3628","url":null,"abstract":"Picosecond lasers (ps-lasers) have significant advantages for the generation of low charge state ions compared to nanosecond lasers because the influence of heat conductivity on a solid target is almost negligible in the case of ps-laser ablation for laser pulse durations less than 10 ps. However, there is no comprehensive data on ion yields for different elements and target irradiation conditions for laser power densities at the target surface around and below 1013 W cm−2, which is of interest to our study of such plasmas as a source of low charge state ions for various applications, particularly for external injection of those ions into an Electron Beam Ion Source (EBIS). We investigated ion generation from Al, Ti, Cu, Nb and Ta target elements by a ps-laser with power densities in the range of 1011–1013 W cm−2 at the target surface. A ps-laser with 1.27 mJ maximum energy within an 8 ps pulse and repetition rate up to 400 Hz has been used to generate a laser-ablated plasma. Dependencies of ion current versus time, total charge of registered ions as well as ion kinetic energy distributions are characterized using a Faraday cup. Significant difference in ion current dynamics between first, second and following shots onto the same target spot was found for all five target elements. The total charge of ions registered by the Faraday cup increases linearly with increasing laser pulse energy and is almost independent of the target element and number of shots onto the same target spot for all five target elements studied. The results obtained give us a basis for specification and design of the source of low charge state ions for external injection into EBIS.","PeriodicalId":36295,"journal":{"name":"Plasma Research Express","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-11-03","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43713295","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

General processes responsible for the space leader birth in streamer coronas of negative leaders 一般流程负责空间领袖诞生的流光冕负领袖

Plasma Research Express Pub Date : 2021-10-15 DOI: 10.1088/2516-1067/ac3018

L. Babich, I. Kutsyk, E. Bochkov, C. Köhn, T. Neubert

{"title":"General processes responsible for the space leader birth in streamer coronas of negative leaders","authors":"L. Babich, I. Kutsyk, E. Bochkov, C. Köhn, T. Neubert","doi":"10.1088/2516-1067/ac3018","DOIUrl":"https://doi.org/10.1088/2516-1067/ac3018","url":null,"abstract":"Local section of one streamer in the streamer coronas ahead of negative leaders of long laboratory sparks can develop into ‘space leaders’, called so because of their high conductivity and initially being unconnected to the main negative leader. Available data of experimental research do not allow reliably unveiling a mechanism causal to the space leader birth. We, here, discuss a hypothetical but general mechanism based, mostly, on thermodynamics. The plasma-chemistry processes in one of the streamers of the negative leader corona and Joule heating of the gas within the streamer channel are casual to a birth of a conducting area in this streamer at the strength of the ambient electric field less than the selfbreakdown magnitude of 30 kV cm−1. Two conclusions follow from the analysis. First, sufficiently high ambient field strength E 0 is required to heat the gas to a temperature sufficiently high for a birth of the conducting area during the observed time t obs. Second, the current of one streamer does provide sufficient heating; for this, the being heated area is to be fed by a multitude of the streamer branches. We limit ourselves to considering processes responsible for a formation of hot conducting areas in the negative corona. We assume that the birth of the heated area in the streamer, start new streamers from its ends and further heating of this area occurs in some local domain where the field strength exceeds the mean magnitude 11 kV cm−1 in the leader corona. We, proceeding from the experimentally observed time t obs of 1 μs, show that the minimal magnitude of the E 0 of 20 kV cm−1 in the being heated area is required to ensure the gas temperature of 2000 K fitting the t obs. To illustrate our conclusions, we, using simplified models, carry out simulations treating selfconsistently the evolution of the electric field and the associated plasma chemistry.","PeriodicalId":36295,"journal":{"name":"Plasma Research Express","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-10-15","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"45766701","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: 3

Abel inversion of soft x-ray fluctuations associated with fast particle-driven fishbone instabilities in MAST plasmas MAST等离子体中与快速粒子驱动鱼骨不稳定性相关的软x射线波动的Abel反演

Plasma Research Express Pub Date : 2021-09-01 DOI: 10.1088/2516-1067/ac256a

K. McClements, J. Young, L. Garzotti, OM Jones, C. Michael

{"title":"Abel inversion of soft x-ray fluctuations associated with fast particle-driven fishbone instabilities in MAST plasmas","authors":"K. McClements, J. Young, L. Garzotti, OM Jones, C. Michael","doi":"10.1088/2516-1067/ac256a","DOIUrl":"https://doi.org/10.1088/2516-1067/ac256a","url":null,"abstract":"A set of soft x-ray cameras provided measurements of high frequency instabilities as well as steady-state emission in the Mega Amp Spherical Tokamak (MAST). It is shown that Abel inversion can be readily applied to fluctuating soft x-ray emission from the MAST midplane associated with fast particle-driven ‘fishbone’ instabilities, characterised by toroidal mode number n = 1. Each fishbone burst had an early phase in which high amplitude fluctuating soft x-ray signals from the plasma core were close to being in phase with each other, and there was a region close to the outboard plasma edge in which the fluctuations were relatively weak and in antiphase with those in the core. The major radius of the ‘phase axis’ at which the mode amplitude changed sign R p was initially outboard of the tokamak magnetic axis at R 0, but moved inboard during the burst, eventually becoming close to R 0, at which time the oscillations were of similar amplitude inboard and outboard of R p . The fishbone radial structure early in the burst can be understood in part by recognising that the mode is supported by energetic ions with a high average toroidal rotation rate: in a co-rotating frame, the effective magnetic axis is shifted outboard by a distance that is comparable to the difference between the major radii of the phase axis early in the burst and the laboratory frame magnetic axis. It is conjectured that the transition to a mode with R p ≃ R 0 occurred because most of the energetic ions were expelled from the plasma core region where the mode amplitude peaked, so that the instability could no longer be characterised as an energetic particle mode. Abel inversion of fishbone soft x-ray emission thus provides useful insights into the nature of energetic particle modes in tokamak plasmas and their relationship with MHD modes.","PeriodicalId":36295,"journal":{"name":"Plasma Research Express","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2021-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43349164","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: 1