2022 IEEE International Conference on Plasma Science (ICOPS)最新文献_第5页

Droplet Formation on the Melt Surface under Heat Load Due to the High-Energy Electron Beams with Power Density Scale of Several MW/CM2 功率密度为几MW/CM2的高能电子束在热负荷下熔体表面形成液滴

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813067

W. An, R. Fetzer, A. Weisenburger, G. Mueller

引用次数: 0

Simulations of Thermionic Emission from Lab6-Vb2 Emitter Lab6-Vb2发射极热离子发射模拟

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/icops45751.2022.9813104

K. Torfason, Á. Valfells, A. Manolescu

引用次数: 0

Smith-Purcell Radiation with Different Grating Parameters and Beam Bunching Frequencies 不同光栅参数和光束聚束频率下的Smith-Purcell辐射

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813010

M. Faisal, A. Iqbal, P. Zhang

引用次数: 0

Design and Characterisation of a Helicon Apparatus for Investigations of Parametric Instabilities in Magnetised Plasma 用于磁化等离子体参数不稳定性研究的螺旋装置的设计与表征

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813143

K. Wilson, L. Selman, C. Whyte, P. Macinnes, A. Young, A. Phelps, A. Cross, L. Zhang, B. Eliasson, D. Speirs, C. Robertson, K. Ronald, A. Cairns, M. Koepke, R. Bingham, R. Bamford

{"title":"Design and Characterisation of a Helicon Apparatus for Investigations of Parametric Instabilities in Magnetised Plasma","authors":"K. Wilson, L. Selman, C. Whyte, P. Macinnes, A. Young, A. Phelps, A. Cross, L. Zhang, B. Eliasson, D. Speirs, C. Robertson, K. Ronald, A. Cairns, M. Koepke, R. Bingham, R. Bamford","doi":"10.1109/ICOPS45751.2022.9813143","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9813143","url":null,"abstract":"Parametric instabilities [1] arise across many plasma physics environments including inertial [2] and magnetic [3] confinement fusion and in ionospheric plasmas [4] . A helicon [5] plasma source can provide a stable, controllable, low temperature and relatively tenuous plasma for periods of hours, making it suited to diagnosis by techniques such as probes and interferometry. Our apparatus operates in inductive and helicon modes driven by an RF antenna in the range of 3<f<30 MHz at powers <4 kW, which creates a noble gas plasma in a 1 m diameter, 3 m long stainless-steel vacuum chamber surrounded by electromagnets providing an axial B0<90 mT. Typically, a source like this would be expected to provide a plasma with 10 15 <n e <10 18 m -3 and T e <10 eV. For these plasma parameters, parametric instabilities such as Raman and Brillouin scattering can be triggered by readily available, powerful microwave sources such as magnetron oscillators and travelling-wave tube amplifiers and broadband pulses developed in dispersive pulse compressors. These sources will launch microwaves into the plasma via a pair of Satoh horns providing a Gaussian beam for microwave scattering experiments. The characterisation of the plasma using the RF-compensated Langmuir probes and complementary microwave interferometry diagnostic is presented.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"266 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":"122178029","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

Beam Energy and Diameter Diagnostics for ASD Scorpius Commissioning ASD天蝎座调试的光束能量和直径诊断

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.2172/1867409

E. Scott, T. Atencio, J. Castaneda, B. Frogget, S. Haque, R. Hibbard, M. Jaworski, D. Moir, V. Romero, J. Schillig, Z. C. Shaw, S. Smith, K. Walters, M. Weller, S. Baker, D. Clayton, T. Burris-Mog

{"title":"Beam Energy and Diameter Diagnostics for ASD Scorpius Commissioning","authors":"E. Scott, T. Atencio, J. Castaneda, B. Frogget, S. Haque, R. Hibbard, M. Jaworski, D. Moir, V. Romero, J. Schillig, Z. C. Shaw, S. Smith, K. Walters, M. Weller, S. Baker, D. Clayton, T. Burris-Mog","doi":"10.2172/1867409","DOIUrl":"https://doi.org/10.2172/1867409","url":null,"abstract":"The commissioning phase of the ASD Scorpius accelerator, a multi-pulse linear induction accelerator, is already underway. To confirm that the accelerator meets requirements, several diagnostics are under development specifically for commissioning. A permanent magnet momentum spectrometer based on a system used at the Dual-Axis Radiographic Hydrodynamic Test (DARHT) facility will provide time-resolved beam energy measurements from below 1.5 MeV to 24 MeV [1] . Both 2-D time-integrated and 1-D time-resolved beam diameter measurements will give information on the spot size and evolution during operation. 2-D time-integrated beam profile measurements will use a gated PI-MAX 4 camera to image the beam profile in fine detail. 1-D time-resolved measurements will use an anamorphic imaging diagnostic previously demonstrated at the DARHT facility [2] . These measurements increase overall signal levels using anamorphic optics to collapse a 2-D image to a 1-D marginal distribution. Use of Bayesian statistics to reconstruct a 2-D image from multiple 1-D measurements is being explored. First use of these diagnostics is planned for 2023.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"27 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":"125889027","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

Neutron Diagnostic Instrumentations for the Fuze Device 引信装置的中子诊断仪器

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9812968

P. Tsai, A. Johansen

{"title":"Neutron Diagnostic Instrumentations for the Fuze Device","authors":"P. Tsai, A. Johansen","doi":"10.1109/ICOPS45751.2022.9812968","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9812968","url":null,"abstract":"Fusion reactor concepts need to demonstrate the ability to produce controlled nuclear fusion. Spectroscopy of neutrons can demonstrate how well the device controls the reaction, whereas the yield shows the efficacy of the device. Both detection systems are diagnostics for D-D neutrons on Zap Energy’s FuZE Shear-Flow-Stabilized Z-Pinch device. Currently two types of activation detectors are used to corroborate the neutron yield. A total of 22 fast plastic scintillating detectors give energy and timing information; 3 additional scintillators are capable of performing pulse shape discrimination to seperate neutrons from bremsstrahlung x-rays. For activation detectors, one is arsenic with an appreciable capture cross section and emitting 0.3 MeV photons with a half life of 17 ms. The other is a LaBr3 activation detector capped with yttrium. This detector features time-resolved multichannel analysis of pulse height spectra coming from two different activations of yttrium and bromide which release photons of 909keV and 208keV, respectively. Fast plastic scintillators give timing information on incoming radiation, and spectroscopic information from the recoil protons. The pulse shape discriminating scintillator can further more identify shots that produce hard X-rays. The combination of these diagnostics allows for both recoil proton spectroscopy and yield measurements.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"28 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":"124848025","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

Revisiting Centrifugal Confinement for high Temperature Plasmas 再论高温等离子体的离心约束

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/icops45751.2022.9813287

R. Reid, J. R. Smith

{"title":"Revisiting Centrifugal Confinement for high Temperature Plasmas","authors":"R. Reid, J. R. Smith","doi":"10.1109/icops45751.2022.9813287","DOIUrl":"https://doi.org/10.1109/icops45751.2022.9813287","url":null,"abstract":"Traditional magnetic mirrors are appealing because of their comparably simple geometry which lends itself to cost-effective construction. However, magnetic mirrors suffer from several inherent problems that make them poor choices for confining and heating plasmas. The chief concerns are the loss-cone instability which continuously saps hot particles from the trap and the interchange instability which effectively transports hot plasma from the core of the trap to the edges where it is lost to the walls. Centrifugal confinement schemes address these concerns with the addition of supersonic poloidal rotation which can effectively shut off the loss-cone. In addition, velocity shear in the flow may mitigate or even turn off the interchange instability if high enough rotation speeds can be achieved. Previous experiments have verified the efficacy of centrifugal confinement but have been unable to achieve sufficient rotation velocities to entirely shut down the interchange modes. [1] The rotation velocity in these experiments was limited by the Critical-Ionization-Velocity (CIV) instability. [3] We plan an experiment to verify that the CIV is the limiting factor in supersonic plasma centrifuges and to explore strategies for avoiding the CIV limit and achieving sufficient rotation speeds to enable stable plasma confinement.","PeriodicalId":175964,"journal":{"name":"2022 IEEE International Conference on Plasma Science (ICOPS)","volume":"75 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":"129869995","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

PIC/MCC Modeling and Validation of Split-Ring Resonator Microwave Microplasma Formation 劈裂环谐振腔微波微等离子体形成的PIC/MCC建模与验证

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813061

S. Pugia, Z. V. Missen, Alina A. Alexeenko, D. Peroulis

{"title":"PIC/MCC Modeling and Validation of Split-Ring Resonator Microwave Microplasma Formation","authors":"S. Pugia, Z. V. Missen, Alina A. Alexeenko, D. Peroulis","doi":"10.1109/ICOPS45751.2022.9813061","DOIUrl":"https://doi.org/10.1109/ICOPS45751.2022.9813061","url":null,"abstract":"Microplasma discharges are of interest both in their fundamental understanding and in their applications – such as plasma sources, metasurfaces, and in emerging radiofrequency and microwave applications. One common topology for microplasma discharge formation is a split-ring resonator. Much work has investigated split-ring resonators as a platform for radiofrequency and microwave driven plasma [1] . Microwave circuit models for the behavior of such circuits have been developed, and electromagnetic simulations of the fields generated by these devices have provided an additional avenue of investigation. This foundation can be valuably extended by introducing particle-in-cell/Monte Carlo collision (PIC/MCC) modeling of the breakdown phenomena. We present the simulation and experimental validation of micro-plasma formation in split-ring resonator structures for frequencies in excess 5 gigahertz. Split-ring resonator devices with planar gap geometry were designed and fabricated at Purdue’s Scifres Nanofabrication Cleanroom. Nominal gap widths between 5 and 20 micrometers were considered as well as signal frequencies between 5 and 18 gigahertz. Breakdown potential was measured experimentally in an Argon environment over a range of ambient pressures less than 1 atmosphere. Finally, PIC/MCC simulations were created in XOOPIC to predict breakdown potential. Measurement-model correlation, and model predictive strength are discussed. Domain-specific modeling challenges and recommendation for future measurements are provided.","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":"128533758","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

Mechanism Of Relaxation In The Electron Bump-On-Tail Instability Beyond The Quasilinear Approximation 超越拟线性近似的电子尾碰撞不稳定性中的弛豫机制

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813016

D. W. Crews, U. Shumlak

引用次数: 0

Kinetic Theory of the Force Distribution Function 力分布函数的运动理论

2022 IEEE International Conference on Plasma Science (ICOPS) Pub Date : 2022-05-22 DOI: 10.1109/ICOPS45751.2022.9813178

S. Baalrud

引用次数: 0