2022 IEEE International Conference on Plasma Science (ICOPS)最新文献_第6页

A Straight Inlet Rotary Sliding ARC Plasma Diesel Engine Exhaust Treatment Method and Device Design 直进旋转式滑动电弧等离子体柴油机排气处理方法及装置设计

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813300

X. Yang, S. Jin, Z. Fang

{"title":"A Straight Inlet Rotary Sliding ARC Plasma Diesel Engine Exhaust Treatment Method and Device Design","authors":"X. Yang, S. Jin, Z. Fang","doi":"10.1109/ICOPS45751.2022.9813300","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9813300","url":null,"abstract":"Diesel exhaust contains a large number of hydrocarbons, which are difficult to decompose and carcinogenic, so it’s necessary to degrade hydrocarbons. Rotary sliding arc discharge is an effective method to decompose hydrocarbons, but the traditional rotary sliding arc discharge needs to rely on tangential air intake. In the actual application of diesel engine exhaust treatment, it has high design difficulty and transformation cost. Direct inlet can realize plasma arc rotating sliding mode without changing the exhaust emission structure of diesel engine. It is simple and practical. In this paper, a low-cost plasma rotary sliding arc device with direct air inlet is proposed, which is based on arc duration T Keep , arc breaking time T d , arc duration cycle Duty , and arc rotation angle ω as the electrical parameter index of sliding arc discharge working characteristics, the mathematical model of rotating sliding arc working electrical characteristic parameters is established by fitting, and the optimal discharge characteristic parameters of the device platform are obtained. The experimental results show that the proposed direct air inlet mode and index evaluation method, the determined input current value of HVDC drive is 35mA, the gas flow rate is 11.5L/min, and the arc rotation angle is 3.09 π, which has the best discharge effect, and the proposed device has an obvious removal effect on carbon hydride.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"1 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":"130615434","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

Grid-Point Requirements for Direct Kinetic Simulation of the Vlasov and Boltzmann Equations Vlasov和Boltzmann方程直接动力学模拟的网格点要求

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813347

W. Chan, I. D. Boyd

{"title":"Grid-Point Requirements for Direct Kinetic Simulation of the Vlasov and Boltzmann Equations","authors":"W. Chan, I. D. Boyd","doi":"10.1109/ICOPS45751.2022.9813347","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9813347","url":null,"abstract":"Vlasov-based numerical methods, or direct kinetic (DK) methods, are increasingly being used to simulate the dynamics of plasmas in a variety of applications ranging from astrophysics and nuclear fusion to space propulsion and materials processing. These methods involve the direct Eulerian simulation of the particle distribution function in the Vlasov or Boltzmann equation, which describes the kinetic transport of this probability density function in configuration (physical) and velocity spaces. The DK method eliminates statistical noise inherent in Lagrangian particle methods and is preferable for multiscale time-varying problems where the tolerable noise floor is low. However, it is generally associated with larger costs due to its higher dimensionality. Viable widespread usage of the DK method requires a detailed understanding of its grid-point requirements so that the underlying mesh is designed efficiently without compromising on solution accuracy. We examine these requirements for a plasma plume expansion process, such as that produced by a laser ablation procedure, which produces a bi-Maxwellian ion distribution due to ambipolar acceleration by fast electrons. In addition to the commonly known Debye-length requirement in physical space, we investigate the corresponding requirement in velocity space, as well as the sensitivity of these requirements to the quantities of interest, such as the species number densities, velocities, and temperatures, as well as their associated electric potential and field.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"16 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":"131965830","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 Study of the Flow Generated by Ne Gas-Puff Z-Pinch Implosions Ne充气z箍缩内爆产生的流动研究

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813095

A. Rososhek, E. Lavine, D. Hammer

引用次数: 0

Hybrid Simulation Of Alfvén Wave Parametric Decay Instability In Laboratory Plasmas 实验室等离子体中alfvsamn波参量衰减不稳定性的混合模拟

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813237

Feiyu Li, Xiangrong Fu, S. Dorfman

{"title":"Hybrid Simulation Of Alfvén Wave Parametric Decay Instability In Laboratory Plasmas","authors":"Feiyu Li, Xiangrong Fu, S. Dorfman","doi":"10.1109/ICOPS45751.2022.9813237","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9813237","url":null,"abstract":"Nonlinear Alfvén waves are subject to parametric instabilities. The parametric decay instability (PDI) is of special interest as it produces backward propagating Alfvén waves which may trigger turbulence development and generates compressible waves which may cause plasma heating. Despite the significant implications, the PDI process has not been directly verified. Recent experiments on the Large Plasma Device (LAPD) showed a modulational-like instability [1] . However, the PDI was missing despite its significant growth rates under the conditions investigated. To resolve the puzzle, we are developing hybrid simulation capabilities to investigate the LAPD-type experiments with realistic geometry and physics conditions. As a first step, we relax the usual periodic boundary conditions and study the PDI of an Alfvén wave packet in a large system under an absorption boundary [2] . We further consider the LAPD-like wave injection and outline the conditions required for observing the PDI in a laboratory plasma [3] . These results may guide the first laboratory verification of the fundamental PDI physics and shed lights on several problems in the heliosphere such as corona/solar-wind heating.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"14 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":"125457230","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

Experimental Investigation of Helicon Thruster Mode Transitions Using Molecular Propellants 分子推进剂对螺旋推进器模式转换的实验研究

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9812976

L. Bevier, J. Little

{"title":"Experimental Investigation of Helicon Thruster Mode Transitions Using Molecular Propellants","authors":"L. Bevier, J. Little","doi":"10.1109/ICOPS45751.2022.9812976","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9812976","url":null,"abstract":"Effective use of molecular propellants in electric propulsion (EP) devices has several benefits over the traditional monatomic gasses including, liquid fuel storage, in situ resource utilization for exploration missions, and multi-mode systems. These propellant advantages come at the cost of complications in both plasma-material interactions and plasma chemistry effects. The former complication can be mitigated by using an electrodeless thruster design however the latter is a relatively unexplored subject in the context of EP plasmas. For multi-mode applications the use of compounds such as Hydroxylammonium Nitrate (HAN), a principal component of the AF-M315E monopropellant, in EP devices is of interest. We present here performance metrics of our Helicon Plasma Thruster (HPT) operating on several products of HAN breakdown including N 2 , N 2 O, and CO 2 . We have also studied the performance of this thruster on Argon in order to compare with a more widely used monatomic gas. Measurements are made using a pendulum momentum flux sensor and an RF compensated Langmuir probe 1 which can sweep across the plume. Furthermore, we have studied how molecular propellants effect mode transitions in our HPT, an important aspect of RF thrusters. Chemical reactions such as dissociation change the chemical composition of the plasma along its axis 2 which effects the performance of the thruster.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"60 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":"126685079","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

The Matter in Extreme Conditions Upgrade (MEC-U) Project 极端条件物质升级(MEC-U)项目

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813304

G. Dyer, E. Galtier, C. Curry, E. Cunningham, L. Fletcher, A. Fry

引用次数: 0

Measurement on the Electrical Conductivity of the Dense Copper Plasma Along the Binodal Curve 沿双节曲线测量致密铜等离子体的电导率

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813311

S. Park, H. Lee, K. Chung, Y. Hwang

{"title":"Measurement on the Electrical Conductivity of the Dense Copper Plasma Along the Binodal Curve","authors":"S. Park, H. Lee, K. Chung, Y. Hwang","doi":"10.1109/ICOPS45751.2022.9813311","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9813311","url":null,"abstract":"Knowledge on the thermophysical properties are crucial for theoretical and experimental studies of warm dense matter (WDM). In this work, we present the electrical conductivity data of copper along the binodal curve in the WDM regime as a function of mass density and temperature. All data are obtained using the underwater wire explosion technique, in which vaporized copper cools along the gas branch of the binodal curve during the current dwell period after the wire explodes. Mass density and temperature are measured by fast imaging and optical spectroscopy, respectively. In contrast to a previous technique, the spectrum emitted by copper plasma is collected at one end of the plasma to exclude spectral distortions incurred by water plasma. We find that this method provides a reliable blackbody spectrum compared with the emission spectra collected across the water plasma layer. The measured temperature data show good agreement with the theoretical binodal curve for copper. Combining these data with the wire resistance measurement, we obtain the conductivities of copper along the binodal. We expect that our methodology suggested here can also be utilized to other materials for various temperatures and densities by changing wire materials and operating conditions of the wire explosion.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"25 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":"123317446","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

Multipactor Mitigation Via Gaussian-Shape Transverse rf Electric Field Near a Dielectric Surface 介电表面附近高斯形状横向射频电场的多因子抑制

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813188

D. Wen, A. Iqbal, C. Scutt, P. Zhang, J. Verboncoeur

{"title":"Multipactor Mitigation Via Gaussian-Shape Transverse rf Electric Field Near a Dielectric Surface","authors":"D. Wen, A. Iqbal, C. Scutt, P. Zhang, J. Verboncoeur","doi":"10.1109/ICOPS45751.2022.9813188","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9813188","url":null,"abstract":"High power microwaves are widely used in space-based communication systems, where multipactor discharges near the microwave window have been a limiting factor [1] . The mitigation of multipactor is of importance for avoiding ionization breakdown and improving signal transmission [1] - [3] . In this work, an engineered Gaussian waveform transverse electric field is demonstrated to be capable of reducing the multipactor strength by an order of magnitude for a fixed input power density 1.2X10 10 W/m 2 [3] , and the corresponding susceptibility of multipactor versus the rf electric field amplitude is also investigated via kinetic particle-in-cell simulations and multi-particle Monte Carlo simulations [4] , [5] . The results show that, at a larger half peak width of the Gaussian waveform Δτ = 0.15T with T = 1ns the rf period, the susceptibility of multipactor is similar to that of a single frequency sinusoidal waveform-driven multipactor. However, at a decreased half peak width Δτ = 0.07T, the multipactor strength decreases with increasing rf electric field amplitude, the unit growth rate is a closed curve in the plane of rf electric field amplitude and dc restoring electric field, implying the effectiveness of Gaussian waveforms in mitigating multipactor in real applications.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"111 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":"121469095","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

Ion Wake Contribution to Minimum Energy Configurations of Dust Structures in a Complex Plasma 离子尾流对复杂等离子体中尘埃结构最小能量构型的贡献

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813293

K. Vermillion, A. Mendoza, J. Carmona-Reyes, B. Wyatt, L. Matthews, T. Hyde

引用次数: 0

Status Report on the LXCat Project LXCat项目的状态报告

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/icops45751.2022.9813059

J. Stephens, L. Pitchford, M. Hopkins, B. Yee

{"title":"Status Report on the LXCat Project","authors":"J. Stephens, L. Pitchford, M. Hopkins, B. Yee","doi":"10.1109/icops45751.2022.9813059","DOIUrl":"https://doi.org/10.1109/icops45751.2022.9813059","url":null,"abstract":"LXCat [1] ( www.lxcat.net ) is an on-line platform for the curation of data needed for modeling the electron and ion components of Low Temperature Plasmas (LTPs). LXCat is open-access and no sign-up is required. The platform is organized in databases which are named and maintained by individual contributors. Nearly 60 people from around the world participate in this project, either by contributing data or by volunteering time to work on other aspects of the project. The data types available now are electron-neutral or ion-neutral scattering cross sections, oscillator strengths, and transport parameters (e.g. mobility, diffusion coefficients) and rate coefficients. The LXCat team does not recommend data and hence data for the same process can appear in one or more of the databases. On-line tools are available that allow visitors to search for specific data, plot and compare data from different databases, download data, or use the available complete sets of electron-neutral scattering cross sections in an on-line Boltzmann solver to calculate transport and rate coefficients in pure gases or gas mixtures. The LXCat team is interested in contacting members of the LTP community about data needs and about how people can volunteer to participate in this project.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"12 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":"126570903","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