Plasma Sources Science and Technology最新文献_第8页

Properties and characteristics of the nanosecond discharge developing at the water-air interface: tracking evolution from a diffused streamer to a spark filament 在水气界面形成的纳秒放电的性质和特征：跟踪从扩散流到火花丝的演变过程

Plasma Sources Science and Technology Pub Date : 2024-02-02 DOI: 10.1088/1361-6595/ad257d

G. Arora, P. Hoffer, V. Prukner, Petr Bílek, Milan Šimek

{"title":"Properties and characteristics of the nanosecond discharge developing at the water-air interface: tracking evolution from a diffused streamer to a spark filament","authors":"G. Arora, P. Hoffer, V. Prukner, Petr Bílek, Milan Šimek","doi":"10.1088/1361-6595/ad257d","DOIUrl":"https://doi.org/10.1088/1361-6595/ad257d","url":null,"abstract":"\u0000 The characteristics of nanosecond discharge propagating along the water-air interface in a unique DBD-like configuration with coplanar electrodes submerged in deionized/tap water are studied by combining ultrafast imaging and emission spectra with electrical characteristics. Time-resolved images provide a clear signature of diffusive plasma excited on the water surface at either side of the blade (insulated plastic separating the anode/cathode) called streamer phase and propagating perpendicularly away from it towards the anode /cathode with different velocities. Later on, the diffusive plasma converts into a few discrete and bright plasma filaments due to ionization instability (spark phase). There is no distinctive dependence in the streamer phase on water conductivity, but in the spark phase, more numerous, brighter, and thicker filaments form in tap water. The time-resolved emission spectra reveal the dominance of the first and second positive system of $mathrm{N_2}$ molecular bands in the streamer phase, followed by the appearance of atomic lines of hydrogen, nitrogen, and oxygen in the spark phase. The emission spectra are utilized to estimate plasma parameters (gas temperature ($T_d$), electric field ($E/N$), and electron density ($n_e$)) where a more dominant spark phase is formed in tap water with $T_dsim1100$ K, $E/N$ $sim800$ Td, and $n_esim10^{18}$ /$rm cm^{-3}$.","PeriodicalId":508056,"journal":{"name":"Plasma Sources Science and Technology","volume":"52 4","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139810252","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

Disorder-induced heating as a mechanism for fast neutral gas heating in atmospheric pressure plasmas 无序诱导加热作为大气压等离子体中快速中性气体加热的一种机制

Plasma Sources Science and Technology Pub Date : 2024-02-02 DOI: 10.1088/1361-6595/ad257e

M. Acciarri, Chris Hudson Moore, Scott D Baalrud

引用次数: 0

Properties and characteristics of the nanosecond discharge developing at the water-air interface: tracking evolution from a diffused streamer to a spark filament 在水气界面形成的纳秒放电的性质和特征：跟踪从扩散流到火花丝的演变过程

Plasma Sources Science and Technology Pub Date : 2024-02-02 DOI: 10.1088/1361-6595/ad257d

G. Arora, P. Hoffer, V. Prukner, Petr Bílek, Milan Šimek

{"title":"Properties and characteristics of the nanosecond discharge developing at the water-air interface: tracking evolution from a diffused streamer to a spark filament","authors":"G. Arora, P. Hoffer, V. Prukner, Petr Bílek, Milan Šimek","doi":"10.1088/1361-6595/ad257d","DOIUrl":"https://doi.org/10.1088/1361-6595/ad257d","url":null,"abstract":"\u0000 The characteristics of nanosecond discharge propagating along the water-air interface in a unique DBD-like configuration with coplanar electrodes submerged in deionized/tap water are studied by combining ultrafast imaging and emission spectra with electrical characteristics. Time-resolved images provide a clear signature of diffusive plasma excited on the water surface at either side of the blade (insulated plastic separating the anode/cathode) called streamer phase and propagating perpendicularly away from it towards the anode /cathode with different velocities. Later on, the diffusive plasma converts into a few discrete and bright plasma filaments due to ionization instability (spark phase). There is no distinctive dependence in the streamer phase on water conductivity, but in the spark phase, more numerous, brighter, and thicker filaments form in tap water. The time-resolved emission spectra reveal the dominance of the first and second positive system of $mathrm{N_2}$ molecular bands in the streamer phase, followed by the appearance of atomic lines of hydrogen, nitrogen, and oxygen in the spark phase. The emission spectra are utilized to estimate plasma parameters (gas temperature ($T_d$), electric field ($E/N$), and electron density ($n_e$)) where a more dominant spark phase is formed in tap water with $T_dsim1100$ K, $E/N$ $sim800$ Td, and $n_esim10^{18}$ /$rm cm^{-3}$.","PeriodicalId":508056,"journal":{"name":"Plasma Sources Science and Technology","volume":"19 1","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-02-02","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139870256","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

Effect of the cathode surface temperature on the cathode fall layer parameters: experiment and simulation 阴极表面温度对阴极下落层参数的影响：实验与模拟

Plasma Sources Science and Technology Pub Date : 2024-02-02 DOI: 10.1088/1361-6595/ad2580

Leanid Simonchik, Mikalai Tomkavich, Gubad Islamov, E. Eylenceoglu, Ismail Rafatov

引用次数: 3

Streamer-induced kinetics of excited states in pure N2: II. Formation of N2(B3Πg, v=0-21) through analysis of emission produced by the first positive system 纯净 N2 中激发态的流线诱导动力学：II.通过分析第一个正向系统产生的发射来形成 N2(B3Πg, v=0-21)

Plasma Sources Science and Technology Pub Date : 2024-01-08 DOI: 10.1088/1361-6595/ad1c09

Petr Bílek, T. C. Dias, V. Prukner, V. Guerra, Milan Šimek

{"title":"Streamer-induced kinetics of excited states in pure N2: II. Formation of N2(B3Πg, v=0-21) through analysis of emission produced by the first positive system","authors":"Petr Bílek, T. C. Dias, V. Prukner, V. Guerra, Milan Šimek","doi":"10.1088/1361-6595/ad1c09","DOIUrl":"https://doi.org/10.1088/1361-6595/ad1c09","url":null,"abstract":"\u0000 Vibrational distributions of electronically excited states of N2 obtained through dipole-allowed radiative transitions provide an important tool to study the kinetics of non-equilibrium plasmas under various discharge conditions. In this work, we report, for the first time, streamer-induced visible/near-infrared-red emission spectra developing during the first hundred nanoseconds after the initiation of the discharge. Emission through the first positive system of N2 was acquired in 500 - 1100 nm range, which allows a complete analysis of the N2(B3Πg, v=0-21) vibrational manifold. The investigated evolution of the vibrational distribution of the N2(B3Πg, v=0-21) state at the centre of the gap corresponds to the transition of the streamer head and the subsequent decay of the streamer channel. We show that the vibrational distribution characterising streamer head is determined by Franck-Condon factors, while during streamer relaxation, it is influenced by the complex interaction between triplet excited states of N2. Additionally, the observed N2(B3Πg, v=13-21) vibrational levels are likely produced by the interaction of high vibrational levels of N2(W3Δu, B’3Σu\u0000 -, B3Πg) with N2(C3Πu) state. We also provide a detailed kinetic scheme for modelling vibrationally-resolved N2(B3Πg) state and compare model results with experimental outcomes.","PeriodicalId":508056,"journal":{"name":"Plasma Sources Science and Technology","volume":"37 9","pages":""},"PeriodicalIF":0.0,"publicationDate":"2024-01-08","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"139447989","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 two-region model for azimuthal striations in an inductively coupled plasma 电感耦合等离子体中方位条纹的双区域模型

Plasma Sources Science and Technology Pub Date : 2024-01-08 DOI: 10.1088/1361-6595/ad1c08

Meng-Zhi Gu, Zhi-Cheng Lei, Yi-kang Pu

引用次数: 0