2022 IEEE International Conference on Plasma Science (ICOPS)最新文献_第8页

Simulations of Thin-Foil Liner Implosions Driven by a Dynamic Screw Pinch 动态螺旋夹紧驱动薄箔衬垫内爆的模拟

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813231

S. Humane, J. Woolstrum, R. Mcbride

引用次数: 0

Low Power Demonstration of a QUASIOPTICAL Active Pulse Compressor for High Power Millimeter-Waves 高功率毫米波准光有源脉冲压缩器的低功率演示

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813042

S. Schaub, B. Hoff

引用次数: 0

Dual Axis Radiography of Laser-Plasma Interactions 激光-等离子体相互作用的双轴射线照相

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813214

E. Tubman, C. Walsh, M. Sherlock, L. Willingale, P. Campbell

引用次数: 0

Biofilm Remediation Using Cold Atmospheric Pressure Plasma Planar and Radial Arrays 低温常压等离子体平面和径向阵列修复生物膜

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813128

M. Pearlman, M. Okebiorun, C. Waite, D. Miller, T. Koch, J. Escoba, J. Tenorio, D. Plumlee, K. Cornell, J. Browning

{"title":"Biofilm Remediation Using Cold Atmospheric Pressure Plasma Planar and Radial Arrays","authors":"M. Pearlman, M. Okebiorun, C. Waite, D. Miller, T. Koch, J. Escoba, J. Tenorio, D. Plumlee, K. Cornell, J. Browning","doi":"10.1109/ICOPS45751.2022.9813128","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9813128","url":null,"abstract":"Cold Atmospheric-Pressure Plasma (CAP) planar and radial arrays have been developed to both inactivate and remove biofilms from surfaces [1] , [2] . The planar arrays are made from Low Temperature Co-fired Ceramic (LTCC), consisting of 8 linear discharge elements 2.4 cm long with a 0.75 mm gap between each element, and operate at 1-3 kV, 20 kHz AC. Typical gas flows use Ar at 13 SLM hydrated with water. Previous results show generation of hydrogen peroxide and hydroxyl radicals which increase linearly with plasma exposure times from the arrays and >99% Colony Forming Unit (CFU) reduction in <60 s for bacterial biofilms on a range of substrates (stainless steel, glass, plastic) [1] . Here we apply these arrays on a much larger surface area (10× 10 cm) by scanning the active array across a surface. The CFU count, chemical assays, and etch rates for this experiment will be presented. The radial arrays consist of four LTCC elements ≈3 cm in diameter with ≈0.75 cm gaps between each element. These radial arrays are designed for use in pipes. Imaging of biofilm removal is also under development.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"47 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":"131976267","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

Investigation into the Acceleration Region Dynamics of a Magnetically Shielded Hall Thruster Operating on Krypton 氪星上磁屏蔽霍尔推进器加速区域动力学研究

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9812952

L. L. Su, B. Jorns

{"title":"Investigation into the Acceleration Region Dynamics of a Magnetically Shielded Hall Thruster Operating on Krypton","authors":"L. L. Su, B. Jorns","doi":"10.1109/ICOPS45751.2022.9812952","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9812952","url":null,"abstract":"Hall thrusters are a promising candidate technology for scaling to the high powers and long lifetimes required for deep-space crewed and robotic exploration [1] . This has largely been enabled by the development of magnetic shielding, a technique that has greatly increased thruster lifetimes [2] , [3] . One of the remaining challenges in using Hall thrusters for deep space missions is the matter of propellant availability; xenon, the traditional propellant of choice, is greatly limited in the atmosphere [4] . A potential alternative to xenon is krypton, which is less expensive and more readily available. However, the efficiency of a magnetically shielded Hall thruster operating on krypton is 9-18% lower than that of the same thruster with xenon, a discrepancy primarily attributed to the lower mass utilization of krypton as shown in our previous work [5] . To further our understanding of the physical causes underlying this difference in efficiency, we need detailed measurements of the internal thruster channel. We accomplish this by employing laser-induced fluorescence, a non-invasive diagnostic technique, to measure ion velocity distribution functions along channel centerline of a shielded Hall thruster operating on krypton. We compare these results to previous measurements of the same thruster operating on xenon. These results yield insight into the mechanisms of krypton operation on a shielded Hall thruster and point to potential methods of improving its efficiency.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"36 3","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2022-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133237852","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

Understanding Effects of Operating Parameters on Plasma Catalytic Nitrogen-Methane Coupling Using Optical Emission Spectroscopy 利用发射光谱研究操作参数对等离子体催化氮-甲烷耦合的影响

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813030

I. Akintola, G. Rivera-Castro, J. Yang, J. Hicks, D. Go

{"title":"Understanding Effects of Operating Parameters on Plasma Catalytic Nitrogen-Methane Coupling Using Optical Emission Spectroscopy","authors":"I. Akintola, G. Rivera-Castro, J. Yang, J. Hicks, D. Go","doi":"10.1109/ICOPS45751.2022.9813030","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9813030","url":null,"abstract":"Non-thermal plasmas (NTPs) produce highly reactive chemical environments made up of electrons, ions, radicals, and vibrationally excited molecules. These reactive species, when combined with catalysts, can help drive thermodynamically unfavorable chemical reactions at low temperatures and atmospheric pressure. We are particularly interested in the direct coupling of light hydrocarbons (e.g. methane) and nitrogen to produce value-added liquid chemicals (e.g. pyrrole and pyridine) in a plasma-assisted catalytic process. In order to effectively create these plasma catalytic systems, it is imperative that there is a fundamental understanding of the plasma-phase chemistry alone. While there have been many studies on nitrogen (N 2 ) and methane (CH 4 ) plasmas, there is limited understanding on how changing operating parameters (i.e. feed ratio of N 2 /CH 4 , plasma power, operating temperature) affect the plasma properties. In this work, we characterize the plasma using optical emission spectroscopy (OES) and analyze the products formed to understand the effects, if any, of varying plasma parameters on product formation. This is done by determining relevant thermodynamic information such as electron density, vibrational and rotational temperatures, as well as comparing the presence of key plasma species (C-N, C-H) to relevant products formed during nitrogen-methane coupling in plasma-alone and plasma catalytic reactions. Preliminary results show electron density increases with increasing methane content, corresponding to higher methane conversion due to increased electron activity in the plasma.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"750 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":"133693819","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

X-Ray Emission Characteristics of Insulated and Bare Wire X-Pinches 绝缘线和裸线x线钳的x射线发射特性

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/icops45751.2022.9813054

S. Ham, J. Ryu, H. Lee, S. Park, Y. Ghim, H. Woo, Y. Hwang, K. Chung

{"title":"X-Ray Emission Characteristics of Insulated and Bare Wire X-Pinches","authors":"S. Ham, J. Ryu, H. Lee, S. Park, Y. Ghim, H. Woo, Y. Hwang, K. Chung","doi":"10.1109/icops45751.2022.9813054","DOIUrl":"https://doi.org/10.1109/icops45751.2022.9813054","url":null,"abstract":"X-ray emission characteristics of insulated wire X-pinch (IXP) and bare wire X-pinch (BXP) are presented. Insulated coating on wires has been suggested as a method for improving the implosion quality of wire array that affect x-ray emission. To understand the effect of insulated coating on x-ray emission of X-pinch, we conduct experiments with Cu BXP and IXP on SNU X-pinch and measure the emitted x-ray using AXUV diode array. Pinch time, x-ray emission time, power, and yield of BXP and IXP are compared; plasma states of X-pinches are estimated by comparing x-ray power ratios with the synthetic spectra from FLYCHK. Consequently, the number of x-ray peaks and the x-ray emission time are reduced in the IXP; the x-ray peak power and yield are also reduced, however a time-averaged x-ray powers of the IXP and the BXP are similar. Furthermore, hard x-ray (HXR) emission significantly decrease in the IXP. From the comparison of the synthetic spectra and the measurement data, we confirm that the reduction of HXR is due to the suppression of x-ray emission by electron beams. Through this study, we suggest the possibility of the IXP as a soft x-ray source.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"31 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":"133099355","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

Helicon Core Formation: A Global Transport Bifurcation Leading to a Radial Transport Barrier and Spontaneous Axial Plasma Detachment 螺旋核的形成:导致径向输运屏障和自发轴向等离子体分离的全球输运分岔

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/icops45751.2022.9813210

S. C. Thakur

{"title":"Helicon Core Formation: A Global Transport Bifurcation Leading to a Radial Transport Barrier and Spontaneous Axial Plasma Detachment","authors":"S. C. Thakur","doi":"10.1109/icops45751.2022.9813210","DOIUrl":"https://doi.org/10.1109/icops45751.2022.9813210","url":null,"abstract":"We report that helicon core formation in rf devices is accompanied by the formation of a radial transport barrier and simultaneous axial plasma detachment; via a self-organized global transition due to a transport bifurcation [1] . Evidence from both Langmuir probes and fast imaging show that the radial extent of the transport barrier is similar to the width of the helicon core. Using spectroscopy and neutral pressure measurements, we simultaneously observe axial plasma detachment, which follow the same hysteresis patterns associated with the radial transport bifurcation. We report dramatic changes in both mean and fluctuation profiles across this transition. This spontaneous self-organized global transition is universal, but the transition-threshold depends on the helicon source parameters. 2-D bifurcation diagrams elucidate various regimes of operation of rf plasma sources (Capacitively Coupled Plasmas, Inductively Coupled Plasmas, Helicon-detached, helicon-attached), allowing access to study basic plasma instabilities, turbulence and transport, as well as divertor-relevant plasma detachment in the same device. Spontaneous plasma detachment has serious implications on the relevance of similar rf devices [2] , [3] designed to study Plasma Material Interactions (PMI). In addition, this also gives us the opportunity to study instabilities, turbulence and transport associated with detached plasmas [4] , [5] .","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"70 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":"117171785","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

First Divertor Thomson Scattering Measurements on Mast-U 桅杆- u上第一分流器汤姆逊散射测量

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813181

J. Clark, M. Bowden, Y. Kim, B. Parry, E. Rose, R. Sarwar, R. Scannell

引用次数: 0

Impedance Effects On Nonlinear Transmission Line Performance 阻抗对非线性传输线性能的影响

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/icops45751.2022.9813058

T. Crawford, X. Zhu, A. Garner

引用次数: 0