IEEE 1989 International Conference on Plasma Science最新文献_第4页

Kinetic theory of ion-cyclotron wave using energy conserving BGK collision operator 基于能量守恒BGK碰撞算子的离子回旋波动力学理论

IEEE 1989 International Conference on Plasma Science Pub Date : 1989-05-22 DOI: 10.1109/PLASMA.1989.166088

S. Sharma

引用次数: 0

Thermal characteristics of non-transferred DC plasma torches under various combinations of pure and mixture gases 非转移直流等离子体炬在各种纯气体和混合气体组合下的热特性

IEEE 1989 International Conference on Plasma Science Pub Date : 1989-05-22 DOI: 10.1109/PLASMA.1989.166170

T. Beuthe, J. Chang, N. Hayashi, S. Ono, A. Kaliński, D. Galicki, K. Brodowicz

{"title":"Thermal characteristics of non-transferred DC plasma torches under various combinations of pure and mixture gases","authors":"T. Beuthe, J. Chang, N. Hayashi, S. Ono, A. Kaliński, D. Galicki, K. Brodowicz","doi":"10.1109/PLASMA.1989.166170","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166170","url":null,"abstract":"The thermal characteristics of two nontransferred DC plasma torches have been investigated for operating powers between 10 and 80 kW for various combinations of Ar, N/sub 2/, H/sub 2/, O/sub 2/ and CO/sub 2/ gas mixtures. The Acurex torch contained an axially struck, flow-stabilized plasma arc roughly 10-cm long and a removable mixing section. The MWR-1 torch contained a radially struck plasma arc 0.5-2-cm long but no mixing section. Typical radial temperatures profiles of the MWR-1 torch indicate the rapidity with which the plasma quenches on entering the reaction chamber. The Acurex torch was much less efficient than the MWR-1 torch (typically 50% versus 75%). The thermal efficiency of the torches was significantly affected by the fraction of N/sub 2/, air, Ar, and H/sub 2/ in the plasma gas. The Acurex torch with the mixing plenum in place was able to achieve much better mixing of the plasma gas than the MWR-1 torch. Side injection of gas tended to raise the downstream temperature of the plasma. Increasing concentrations of H/sub 2/ in the Ar-H/sub 2/ plasma decreased the temperature near the exit of the torch and increased the temperature further downstream.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"58 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126344406","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

Spectroscopic investigation of the RGS-II hypervelocity plasma armature RGS-II超高速等离子体电枢的光谱研究

IEEE 1989 International Conference on Plasma Science Pub Date : 1989-05-22 DOI: 10.1109/PLASMA.1989.165970

B. D. Barrett, R. Bengtson, M. Baker, W. Nunnally

引用次数: 0

Real plasma effects of microwave radiation propagating perpendicular to a magnetized plasma 垂直于磁化等离子体传播的微波辐射的真实等离子体效应

IEEE 1989 International Conference on Plasma Science Pub Date : 1989-05-22 DOI: 10.1109/PLASMA.1989.166243

L. Jiang, J. R. Roth

引用次数: 1

Beam studies in the LBL MBE-4 device LBL MBE-4装置中的光束研究

IEEE 1989 International Conference on Plasma Science Pub Date : 1989-05-22 DOI: 10.1109/PLASMA.1989.166212

S. Eylon, H. Meuth, R. Johnson, K. Hahn

{"title":"Beam studies in the LBL MBE-4 device","authors":"S. Eylon, H. Meuth, R. Johnson, K. Hahn","doi":"10.1109/PLASMA.1989.166212","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166212","url":null,"abstract":"The multiple-beam accelerator MBE-4 is a device for research toward a heavy ion driver for inertial confinement fusion based on the induction linac concept. Its main goal is proof of the principle of current amplification by acceleration and controlled self-similar beam pulse compression. Into the 16-m long electrostatic alternate-gradient focusing lattice four beams are injected. Each carries an initial current of 10 mA of Cs/sup +/ ions from a Marx-driven diode at 200 keV. The current amplification is up to ninefold, with a final beam energy in excess of 800 keV in the middle of the current pulse. Available diagnostics include transverse double-slit emittance and position measuring devices; current-sensing Faraday cups; and electrostatic energy analysis. Diagnostic access is possible along the entire device at a number of stations and is fully computer controlled. The longitudinal and transverse properties of the 10-mA beams with and without acceleration are being studied. The diagnosis of the transport of a 100- mu A pencil beam, 1.5 mm in diameter, through an accelerating channel of a 5.7-cm diameter has begun. This beam has been used to determine the zero-current phase advance for various beam and machine parameters and to address some mechanical alignment issues as well.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"25 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130162211","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: 1

Final focusing of Z-discharge transported ion beams z型放电传输离子束的最终聚焦

IEEE 1989 International Conference on Plasma Science Pub Date : 1989-05-22 DOI: 10.1109/PLASMA.1989.166094

J. Neri, J. R. Boller, G. Cooperstein, P. Goodrich, D. Hinshelwood, D. Mosher, P. Ottinger, V. C. Scherrer, S. Stephanakis, J. Watrous, F. Young

{"title":"Final focusing of Z-discharge transported ion beams","authors":"J. Neri, J. R. Boller, G. Cooperstein, P. Goodrich, D. Hinshelwood, D. Mosher, P. Ottinger, V. C. Scherrer, S. Stephanakis, J. Watrous, F. Young","doi":"10.1109/PLASMA.1989.166094","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166094","url":null,"abstract":"An experimental program is underway at NRL to demonstrate final focusing of transported ion beams. Z-discharge channels are used to transport ion beams efficiently from the ion source to an ICF target, providing isolation and distance for time-of-flight power compression. Channel stability and beam energy loss constraints force a minimum channel diameter for a given ion beam power. Final focusing uses an additional short Z-discharge with larger current to reduce the spot size of the ion beam from the channel diameter to the target diameter. The Gamble II accelerator is used to produce a proton beam from a pinched-reflex diode. The effect of the final focus is measured with a shadowbox at the exit of the final focus cell, and the transport is measured by the /sup 19/F(p, alpha gamma ) reaction from 50% transparent Teflon screens placed in the channel. Analysis of the shadowbox damage patterns indicates that the final focus cell plasma is taken into account. The 2.54-cm-diameter ion beam from the channel is reduced in diameter to less than 1.4 cm.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"99 2 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130237614","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

Characteristics of a 30 kW plasma torch 30kw等离子炬的特性

IEEE 1989 International Conference on Plasma Science Pub Date : 1989-05-22 DOI: 10.1109/PLASMA.1989.166037

J. Busnardo‐Neto, V. A. Rodrigues, H. Bockelmann, P. H. Sakanaka

引用次数: 0

A study of binary ion plasma expansion into laboratory generated plasma wakes 二元离子等离子体膨胀到实验室产生的等离子体尾迹的研究

IEEE 1989 International Conference on Plasma Science Pub Date : 1989-05-22 DOI: 10.1109/PLASMA.1989.166052

K. Wright, N. Stone, U. Samir

{"title":"A study of binary ion plasma expansion into laboratory generated plasma wakes","authors":"K. Wright, N. Stone, U. Samir","doi":"10.1109/PLASMA.1989.166052","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166052","url":null,"abstract":"Plasma expansion into the wake of a large rectangular plate immersed in a collisionless, supersonic, binary ion plasma has been investigated. A new plasma source has been developed to generate equivelocity, binary ion plasma flows, which allows access to regions of parameter space that have previously been unavailable for laboratory studies. A krypton-neon plasma (mass ratio of 4.15) is used, and the ambient density ratio of neon to krypton is varied more than an order of magnitude. The expansion is limited to early times by the combination of plasma density, plasma drift speed, and vacuum chamber size. No previous experimental results exist for such early expansion times. New experimental results include: (1) the propagation of a rarefaction wave for each ionic component into the ambient plasma; (2) the formation of a plateau-like region in the neon (the lighter mass) ion current density when the neon ions are the minor ionic species in the ambient plasma; and (3) the acceleration of both ionic species, with neon accelerating at a higher rate than krypton. Results indicate that the plasma expansion process is the dominant filling mechanism of the near wake of a body under these experimental conditions.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"24 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133931514","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

Magnetic compression of an aluminum vapor cylinder 铝气瓶的磁力压缩

IEEE 1989 International Conference on Plasma Science Pub Date : 1989-05-22 DOI: 10.1109/PLASMA.1989.166162

P. Audebert, E. Figura, C. Rouillé, B. Etlicher, A. Folkierski, S. Niffikeer

引用次数: 0

Density, potential, and magnetic field fluctuation measurements during MHD activity in the TEXT tokamak TEXT托卡马克MHD活动期间的密度、电位和磁场波动测量

IEEE 1989 International Conference on Plasma Science Pub Date : 1989-05-22 DOI: 10.1109/PLASMA.1989.166282

T. Crowley, V. Simcic, P. Schoch, K. Connor, R. Hickok, X. Yang

{"title":"Density, potential, and magnetic field fluctuation measurements during MHD activity in the TEXT tokamak","authors":"T. Crowley, V. Simcic, P. Schoch, K. Connor, R. Hickok, X. Yang","doi":"10.1109/PLASMA.1989.166282","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166282","url":null,"abstract":"A heavy ion beam probe (HIBP) has been used to measure signals associated with density, potential, and magnetic fluctuations during sawtooth and strong m=2 activity in TEXT. Preliminary results reveal magnetic and density fluctuation signals with a strong dependence on minor radius position. Phase shifts near 180 degrees have been observed between neighboring peaks and are consistent with a model in which the signal changes sign across a rational surface. Density fluctuation signal peaks occur near magnetic fluctuation signal peaks when both are observed. Results from a different set of plasmas in which soft X-ray sawteeth are observed are also reported. Potential sawtooth changes as large as 70 V have been observed in these plasmas. An HIBP injects a beam of Tl/sup +/ particles into the plasmas. Tl/sup ++/ ions created in a 0.1 cm/sup 3/ sample volume in the plasma are detected after exiting the plasma. By measuring the energy of the Tl/sup ++/, the potential in the sample volume is determined. The number of Tl/sup ++/ ions at the detector is proportional to the density in the sample volume. It also depends on beam attenuation effects along the entire beam trajectory. Attenuation effects are more significant for fluctuations with long correlation lengths.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"38 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130906820","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