2007 IEEE 34th International Conference on Plasma Science (ICOPS)最新文献_第9页

A Single Channel Discharge Reactor for the Diagnosis of Dielectric Barrier Discharge Reactors 用于介质阻挡放电反应器诊断的单通道放电反应器

2007 IEEE 34th International Conference on Plasma Science (ICOPS) Pub Date : 2007-06-17 DOI: 10.1109/PPPS.2007.4651917

S. Yao, Y. Fujioka

引用次数: 0

Effect of Pulse Width on Ozone Generation in Pulsed Streamer Discharges 脉冲宽度对脉冲流光放电中臭氧生成的影响

2007 IEEE 34th International Conference on Plasma Science (ICOPS) Pub Date : 2007-06-17 DOI: 10.1109/PPPS.2007.4345639

H. Tamaribuchi, D. Wang, T. Namihira, T. Sakugawa, S. Katsuki, H. Akiyama

引用次数: 7

Plasma Formation, Evolution, and Dynamics in 100-1000 TW Vacuum-Transmission-Line Post-Hole Convolutes 等离子体的形成、演化和动力学在100-1000 TW真空传输在线孔后卷积

2007 IEEE 34th International Conference on Plasma Science (ICOPS) Pub Date : 2007-06-17 DOI: 10.1109/PPPS.2007.4345514

D. Rose, D. Welch, T. Hughes, R. Clark, W. Stygar

{"title":"Plasma Formation, Evolution, and Dynamics in 100-1000 TW Vacuum-Transmission-Line Post-Hole Convolutes","authors":"D. Rose, D. Welch, T. Hughes, R. Clark, W. Stygar","doi":"10.1109/PPPS.2007.4345514","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4345514","url":null,"abstract":"Summary form only given. Vacuum post-hole convolutes are a critical component in present and future high-power z-pinch drivers. A post-hole convolute is used to join several transmission lines in parallel, transferring the combined currents to a single transmission line attached to a load. Magnetic insulation is lost at positions inside the convolute due to the formation of magnetic-field nulls. Electron sheath-current losses in the convolute region of transmission lines have been explored previously. As power levels for planned z-pinch facilities are increased, the formation of electrode plasmas represents an additional potential power-flow loss mechanism. The 3D particle-in-cell code LSP is being used to study the dynamics of electrode plasmas in post-hole convolutes. The simulations use an implicit field-solver and particle advance for modeling the evolution of the dense plasmas. Simulations of the Z accelerator double-post-hole convolutes and load region that include cathode-and anode-plasma formation in the vicinity of the convolute are being conducted. Potential electrical power loss in this region due to the presence of these plasmas is estimated. In addition, simulations of triple-post-hole convolute designs supporting future z-pinch accelerators are also in progress. Available results will be presented.","PeriodicalId":446230,"journal":{"name":"2007 IEEE 34th International Conference on Plasma Science (ICOPS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129122776","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: 4

Prospect of Orotron in THz Regime 太赫兹区Orotron的前景

2007 IEEE 34th International Conference on Plasma Science (ICOPS) Pub Date : 2007-06-17 DOI: 10.1109/PPPS.2007.4346009

M. Chung

引用次数: 0

Silicon and Silicon Carbide Avalanche Diodes for Use in Pulse Sharpening and Closing Switch Applications 用于脉冲锐化和闭合开关应用的硅和碳化硅雪崩二极管

2007 IEEE 34th International Conference on Plasma Science (ICOPS) Pub Date : 2007-06-17 DOI: 10.1109/PPPS.2007.4345502

R. Focia

引用次数: 0

Redesign and 3D-Simulation of the Quasi-Optical Mode Converter for a TE22,6 118 GHz Gyrotron te22,6 118 GHz回旋管准光模式转换器的设计与三维仿真

2007 IEEE 34th International Conference on Plasma Science (ICOPS) Pub Date : 2007-06-17 DOI: 10.1109/PPPS.2007.4346116

H. O. Prinz, A. Arnold, G. Dammertz, M. Thumm

{"title":"Redesign and 3D-Simulation of the Quasi-Optical Mode Converter for a TE22,6 118 GHz Gyrotron","authors":"H. O. Prinz, A. Arnold, G. Dammertz, M. Thumm","doi":"10.1109/PPPS.2007.4346116","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4346116","url":null,"abstract":"Summary form only given. A quasi-optical mode converter for the European TE22,6 118 GHz gyrotron was designed. It consists of a launcher with wall deformation, followed by a quasi-elliptical mirror, a plane mirror, and a parabolic mirror. Measurements with the mode converter installed in the gyrotron and with low power mock-up show a double peak output field pattern which was not predicted by simulation using Kirchhoffpsilas diffraction integral. To understand this behavior a detailed analysis of the mode converter was performed. The third mirror is not only focusing the main beam but also the side lobes originating from the launcher into the center of the beam. As these different waves have different phase relations the superposition results in a field pattern with minima and maxima in the window plane. To avoid the interaction two new designs for this quasi-optical mode converter are proposed. The first modification only includes a change of the third mirror which is easy to change. This proposal gives a broader output beam because the third mirror is less focusing to avoid the side lobe interaction in the window plane. But this gives only a power transmission through the window of 93% with a Gaussian mode content of 94% (window aperture 80 mm). To minimize the stray radiation and enhance the power transmission through the window the focusing properties of the second and third mirror have to be adapted. This is the better solution but cannot be installed due to high costs. The side lobes are directed in parallel to the main beam at the output. This setup has a power transmission of 98.2% and the Gaussian mode content is 95%. We will present the 3D electric field simulation results for the two designs using the electric field integral equation and show the excellent agreement to the low power measurement carried out.","PeriodicalId":446230,"journal":{"name":"2007 IEEE 34th International Conference on Plasma Science (ICOPS)","volume":"46 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131016605","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

Chamberless plasma enhanced chemical vapor deposition of BPSG films 无腔室等离子体增强BPSG膜的化学气相沉积

2007 IEEE 34th International Conference on Plasma Science (ICOPS) Pub Date : 2007-06-17 DOI: 10.1109/PPPS.2007.4346138

S. Wang, X. Xu, M. Yin, L. Zhao

引用次数: 0

Different Mechanisms of Shock Wave Generation and Breakdown Upon Electrical Explosion of Thin Wires in Open Air 露天细导线电爆炸冲击波产生和击穿的不同机理

2007 IEEE 34th International Conference on Plasma Science (ICOPS) Pub Date : 2007-06-17 DOI: 10.1109/PPPS.2007.4345906

S. Tkachenko, D. Barishpoltsev, G. V. Ivanenkov, V. Romanova, A. E. Ter-Oganesyan, A. R. Mingaleev, T. Shelkovenko, S. Pikuz

{"title":"Different Mechanisms of Shock Wave Generation and Breakdown Upon Electrical Explosion of Thin Wires in Open Air","authors":"S. Tkachenko, D. Barishpoltsev, G. V. Ivanenkov, V. Romanova, A. E. Ter-Oganesyan, A. R. Mingaleev, T. Shelkovenko, S. Pikuz","doi":"10.1109/PPPS.2007.4345906","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4345906","url":null,"abstract":"Summary form only given. Experimental data on the electrical explosion of micron-scale diameter wires with a 10 kA current pulse having a rise rate of up to 50 A/ns are presented. Numerous experiments have made it possible to systemize data on the explosion of copper and tungsten wires in open air. A series of optical images of discharge channels enabled us to form a picture of the motion of explosion-generated shock wave (SW) fronts and the boundaries of dense vapor from the electrical explosion of the wires (EEW). This served as the base for constructing a simple model of processes accompanying the generation of a shock wave from the EEW in air. It can also be stated that when wires are electrically exploded in air, a breakdown of the inter-electrode gap is possible in two scenarios, depending to a large extent on the thermophysical properties of the exploding wires. In the first case, the breakdown occurs in the air at the boundary of dense explosion products, e.g., tungsten vapor. The shunting of current hinders further heating of the wire material, and the pressure increase behind the SW front hinders further rapid expansion of wire explosion products. In the second scenario, development of breakdown occurs in the wire material vapor rather than in the surrounding medium. An example of the development of such a process can be observed when low-melting-point copper wire is exploded. The energy continues to be deposited in the wire explosion products, which supports their further explosive expansion. This can explain the noticeable difference in optical shadowgraphs of the discharge channel structure between electrically exploding copper and tungsten wires in air.","PeriodicalId":446230,"journal":{"name":"2007 IEEE 34th International Conference on Plasma Science (ICOPS)","volume":"1 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130363925","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

Shot Noise of High Current Electron Field Emission 大电流电子场发射的散粒噪声

2007 IEEE 34th International Conference on Plasma Science (ICOPS) Pub Date : 2007-06-17 DOI: 10.1109/PPPS.2007.4345886

L. Ang, L. Wu

引用次数: 0

Gyrotron Collective Thomson Scattering Diagnostics of Fast Ions in Textor and Asdex Upgrade Textor中快离子的回旋加速器集体汤姆森散射诊断及Asdex升级

2007 IEEE 34th International Conference on Plasma Science (ICOPS) Pub Date : 2007-06-17 DOI: 10.1109/PPPS.2007.4345610

P. Woskov, S. Korsholm, H. Bindslev, F. Leipold, F. Meo, P. Michelsen, S. Michelsen, S. Nielsen, E. Westerhof, J. Oosterbeek, J. Hoekzema, F. Leuterer, D. Wagner

{"title":"Gyrotron Collective Thomson Scattering Diagnostics of Fast Ions in Textor and Asdex Upgrade","authors":"P. Woskov, S. Korsholm, H. Bindslev, F. Leipold, F. Meo, P. Michelsen, S. Michelsen, S. Nielsen, E. Westerhof, J. Oosterbeek, J. Hoekzema, F. Leuterer, D. Wagner","doi":"10.1109/PPPS.2007.4345610","DOIUrl":"https://doi.org/10.1109/PPPS.2007.4345610","url":null,"abstract":"Summary form only given. A critical need exists for confined fast ion diagnostics in tokamak fusion experiments, particularly for fusion product alpha particles in ITER and future fusion burning experiments. To develop this diagnostic capability and in support of current fast ion plasma physics research, collective Thomson scattering (CTS) diagnostics have been implemented at TEXTOR and ASDEX Upgrade (AUG) tokamaks using available gyrotron infrastructure with the addition of sensitive scattered signal receiver systems. At TEXTOR a 180 kW, 110 GHz gyrotron and a 42 channel. 6 GHz bandwidth heterodyne receiver has achieved up to 100 CTS scattered spectra per plasma shot with 4 ms time and 10 cm spatial resolution. Large scattering angles (~160deg) with steerable optics enable observation of fast ion spatial and field orientation anisotropies. Studies of fast ion dynamics behavior with neutral beam injection (NBI) and ion cyclotron heating have commenced, resulting in unique observations of fast ions redistributions during sawteeth and slow down after NBI turn off. At AUG a 1 MW, 105 GHz mode of a two-frequency gyrotron with a 50 channel, 10 GHz bandwidth receiver is becoming operational for CTS diagnostics with resolutions similar to TEXTOR. Precise gyrotron frequency measurements, notch filter timing, transmission line alignments, and receiver field of view mappings inside the tokamak have been accomplished using novel beam profile instrumentation. AUG-CTS commissioning progress will be presented. Plasma measurements in AUG are expected to provide new insights into fast ion physics and to further validate gyrotron CTS as a fast ion diagnostic tool for ITER.","PeriodicalId":446230,"journal":{"name":"2007 IEEE 34th International Conference on Plasma Science (ICOPS)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2007-06-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"129190444","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