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IEEE 1989 International Conference on Plasma Science最新文献

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Cooling of accelerator beams to improve focal properties 冷却加速器光束以改善聚焦特性
IEEE 1989 International Conference on Plasma Science Pub Date : 1989-05-22 DOI: 10.1109/PLASMA.1989.166213
T. Katayama
{"title":"Cooling of accelerator beams to improve focal properties","authors":"T. Katayama","doi":"10.1109/PLASMA.1989.166213","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166213","url":null,"abstract":"For inertial fusion with a heavy ion beam, several storage and buncher rings will be used to accumulate a high-current beam and produce a bunch shape as narrow as approximately 50 ns. The beams extracted from these rings will be transported to the target and used for the implosion of fuels. The key issues among the many accelerator beam dynamics problems are: (1) the suppression of coherent instabilities of high-current, short bunched beams of relatively low energy ( approximately 50 MeV/u); (2) focusing the beam uniformly on the small target through the long beam transport line in the presence of chromatic aberration; and (3) the selection of a structure and materials to achieve a plasma temperature of several hundreds of electron-volts. Present research is focused on beam cooling devices to be installed for the improvement of beam emittance and momentum spread, to assure a small focal spot of the extracted beam on the target. Stochastic and electron beam cooling techniques are being developed.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"46 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":"129036488","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
Characterization of aluminum x-pinch plasmas driven by the 0.5 TW Lion accelerator 由0.5 TW Lion加速器驱动的铝x-pinch等离子体的特性
IEEE 1989 International Conference on Plasma Science Pub Date : 1989-05-22 DOI: 10.1109/PLASMA.1989.166296
N. Qi, D. Hammer, D. Kalantar, W. A. Noonan, M. Richardson, G. Rondeau, J. Workman
{"title":"Characterization of aluminum x-pinch plasmas driven by the 0.5 TW Lion accelerator","authors":"N. Qi, D. Hammer, D. Kalantar, W. A. Noonan, M. Richardson, G. Rondeau, J. Workman","doi":"10.1109/PLASMA.1989.166296","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166296","url":null,"abstract":"The x-pinch, obtained by crossing two fine wires at one or more points as the load for the 0.5-TW Lion accelerator, has been used as a bright X-ray source. High-density and high-temperature hot spots are observed at the crossing point(s). From these hot spots, an intense, spatially confined burst of X-rays is emitted which can served as a pump for resonant photopumping lasers. Experimental results concerning the radiation emission using Al x-pinches are reported. The optimum mass loading for different ionization stages of Al ions and the total X-ray energy yields have been examined. The density and temperature of the plasma and the size of the hot spots have been measured. Diagnostics used for these include pinhole photography, streak and framing photography, filtered XRDs, pin diodes, and XUV and soft X-ray spectroscopy. The size of the hot spots is determined from pinhole photographs. No strong Al line radiation for photon energy is found in the range from 300 to 1500 eV. When the He-like or H-like ionization stage is reached, radiation is dominated by resonant K-shell line radiation approximately 1.6 keV in energy. Thus, at the higher hot-spot temperatures, XRDs with filters suitable for the soft X-ray region are used to estimated the Al plasma temperature and to measure the soft X-ray radiation energy yield. The total K-shell line radiation of Al ions is monitored by a pin diode.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"28 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":"123651287","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 computational analysis of energy and mass transport in plasma skull melting processes 等离子颅骨熔化过程中能量和质量输运的计算分析
IEEE 1989 International Conference on Plasma Science Pub Date : 1989-05-22 DOI: 10.1109/PLASMA.1989.166171
A. Brent, K. Reid
{"title":"A computational analysis of energy and mass transport in plasma skull melting processes","authors":"A. Brent, K. Reid","doi":"10.1109/PLASMA.1989.166171","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166171","url":null,"abstract":"A mathematical modeling program has been initiated to provide computational capabilities applicable to process development, equipment design and process control of plasma reactors for molten-bath plasma furnace melting. The mathematical model developed fully addresses the conjugate heat transfer, phase change, and boundary condition aspects of the problem and provides numerical solutions to the governing equations. The relative influences of thermal buoyancy and thermocapillary and arc-shear-induced flow on both the melt-pool volume and skull profile have been examined, and interactions between the flow effects have been analyzed.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"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":"123652615","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
Strong steering of intense electron beams in circular accelerators with transverse wire arrays 横向线阵列环形加速器中强电子束的强转向
IEEE 1989 International Conference on Plasma Science Pub Date : 1989-05-22 DOI: 10.1109/PLASMA.1989.166090
S. Humphries, E. Schamiloglu
{"title":"Strong steering of intense electron beams in circular accelerators with transverse wire arrays","authors":"S. Humphries, E. Schamiloglu","doi":"10.1109/PLASMA.1989.166090","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166090","url":null,"abstract":"Theoretical studies of transverse conductors of novel geometries that exert strong steering forces are reported. The concept of foil focusing has been extended to structures that are nonuniform in the transverse direction. The limiting case is an axial array of single wires along a diameter of the transport tube. The strong steering force and high transparency of wire arrays suggest applications to circular accelerators such as recirculating induction linacs. As an example of capabilities, a wire array can contain a 50-MeV, 30-kA electron beam with a tube radius of curvature of only 0.5 m. An energy error of 20 MeV shifts the beam axis only about 1 mm. The high momentum acceptance may have applications to multipass recirculators.<<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":"121408233","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
Test-particle simulations of Fermi acceleration of electrons at quasiperpendicular shocks 准垂直激波下电子费米加速度的测试粒子模拟
IEEE 1989 International Conference on Plasma Science Pub Date : 1989-05-22 DOI: 10.1109/PLASMA.1989.166118
G. Gisler
{"title":"Test-particle simulations of Fermi acceleration of electrons at quasiperpendicular shocks","authors":"G. Gisler","doi":"10.1109/PLASMA.1989.166118","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166118","url":null,"abstract":"Summary form only. A type of first-order Fermi electron acceleration associated with quasi-perpendicular shocks has been studied. Ion-scale transverse waves in the magnetic field upstream of the shock do not scatter electrons. However, when these waves are advanced into the shock, the leading edges are compressed first, producing mirror points for a large fraction of the electrons. Thus a population of electrons is trapped in a flux tube between two such mirror points that converge as the field continues to advect into the shock. A similar trap is formed when straight field lines are advected into a concave region of a corrugated shock. In either case, the population is longitudinally accelerated by compression between converging mirrors. A few electrons, having special initial conditions, can be accelerated by this means to energies thousands of times greater than their injection energies. Starting from a Maxwellian distribution of initial energies, the resulting particle energy spectrum is a mildly heated (factors of two to five) Maxwellian plus a power law to very high energies with an index -2.6.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"26 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":"114359976","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
Dynamics of cusp produced rotating beam 尖顶产生旋转梁的动力学
IEEE 1989 International Conference on Plasma Science Pub Date : 1989-05-22 DOI: 10.1109/PLASMA.1989.165995
J. Choe, K. Boulais, E. Choi, V. Ayers
{"title":"Dynamics of cusp produced rotating beam","authors":"J. Choe, K. Boulais, E. Choi, V. Ayers","doi":"10.1109/PLASMA.1989.165995","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.165995","url":null,"abstract":"The cusptron is based on an axis-encircling beam produced by magnetic cusp injection. The fundamental properties of the cusp dynamics have been examined by using simplified, but still realistic, models that assess the effects of various experimental parameters in terms of gain reduction. An attempt has been made to devise experimentally realizable optimum beam configurations. Special emphasis is given to off-centering sources and methods to reduce them. The single particle orbit equation has been solved using simple approximations from which the effects of several field contributing factors are examined. The experimental factors considered were the magnetic field profiles, including the degree of the field reversal, the cusp transition thickness, and the adiabatic compression after the transition. It has been found that the unbalanced field effect generally contributes most to the off-centering and that adiabatic compression after the cusp reduces both the beam radius and the off-centering effect. The features of an optimum magnetic field are given.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"150 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":"116364484","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
Improvements in microchannel plate operating characteristics 微通道板工作特性的改进
IEEE 1989 International Conference on Plasma Science Pub Date : 1989-05-22 DOI: 10.1109/PLASMA.1989.166226
A. Roquemore, S. Medley
{"title":"Improvements in microchannel plate operating characteristics","authors":"A. Roquemore, S. Medley","doi":"10.1109/PLASMA.1989.166226","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166226","url":null,"abstract":"Studies have been carried out to overcome two disadvantages of multichannel plates (MCPs): (1) saturation effects in the count rate at high incident particle/photon fluxes, which may be further complicated by the presence of fusion neutron/gamma radiation, and (2) extraneous noise generated by gyroelectrons originating from the negatively biased input surface of the MCP when the detector is operated in an external magnetic field (B=100 G), which is parallel to the input surface of the plate. A hot MCP is presently under investigation. This detector supports an increased strip current, which is expected to yield at least an order of magnitude improvement in count rate before saturation occurs. Initial attempts to eliminate the spurious noise problems due to gyroelectrons were focused on shielding the MCP from external magnetic fields by enclosing the detector in a soft iron shield. The current concept entails a method to ground the input surface of the MCP and bias the exit anode pad (previously at ground potential) to +2100 V. This method requires capacitive coupling of the anode pad to the signal processing electronics.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"65 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":"121569055","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
Simulation of plasma generation by microwave power beaming 微波功率光束产生等离子体的模拟
IEEE 1989 International Conference on Plasma Science Pub Date : 1989-05-22 DOI: 10.1109/PLASMA.1989.166260
P. Koert, P. Lallement
{"title":"Simulation of plasma generation by microwave power beaming","authors":"P. Koert, P. Lallement","doi":"10.1109/PLASMA.1989.166260","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166260","url":null,"abstract":"Plasma generation in the atmosphere by microwave power beaming is an integral part of the design of a RF transmission system that uses a plasma cloud as a reflector. The microwave breakdown of air through avalanche ionization has been simulated on a computer. Focusing techniques using large heater array antennas have been explored and evaluated for their ability to create a plasma cloud at a prescribed location and inclination. These techniques include frequency chirping, random thinning of the heater array, discrete vertical scanning, and use of multiple heater pulses. The effects of these techniques on the shape, intensity, and gradient of the plasma cloud have been determined. Irregularities in the plasma cloud have been analyzed.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"13 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":"121715512","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 potential of D-T and D-/sup 3/He fuel cycles in field-reversed configurations D- t和D-/sup 3/He燃料循环在油田反向配置中的潜力
IEEE 1989 International Conference on Plasma Science Pub Date : 1989-05-22 DOI: 10.1109/PLASMA.1989.166178
W. Kernbichler, G. Miley
{"title":"The potential of D-T and D-/sup 3/He fuel cycles in field-reversed configurations","authors":"W. Kernbichler, G. Miley","doi":"10.1109/PLASMA.1989.166178","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166178","url":null,"abstract":"The high beta and the divertor action of the open field lines of the field-reversed configuration (FRC) are especially attractive for high-power-density operation and for direct energy conversion. Due to its early stage of development, many problems are unsolved. A key one is particle and energy transport, where several models offer different scaling laws, ranging from the upper limit given by the loss sphere scattering model to more pessimistic laws based on anomalous lower hybrid transport. The authors have fitted the loss sphere model to the limited database available and compared the results with those of other scaling laws. They have focused on the energetic and nuclear performance of both D-T- and D-/sup 3/He-fueled plasmas in such a device. A profile averaged 0-D plasma model that includes all relevant physical processes has been used. The D-T cycle with its lower operating temperature offers an easier start-up scenario than D-/sup 3/He. The D-/sup 3/He cycle, however, offers a unique possibility for a low-neutron and low-radioactivity environment. It also provides favorable conditions for direct energy conversion of charged particles, which is ideally suited to the FRC.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":" 88","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"1989-05-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"113952607","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 Hall-current model of electron loss after POS opening into high-impedance loads 高阻抗负载打开后电子损失的霍尔电流模型
IEEE 1989 International Conference on Plasma Science Pub Date : 1989-05-22 DOI: 10.1109/PLASMA.1989.166187
J. Greenly
{"title":"A Hall-current model of electron loss after POS opening into high-impedance loads","authors":"J. Greenly","doi":"10.1109/PLASMA.1989.166187","DOIUrl":"https://doi.org/10.1109/PLASMA.1989.166187","url":null,"abstract":"A self-consistent relativistic model of laminar Hall (E*B) electron flow access of a plasma-opening-switch (POS) plasma allows a loss mechanism after opening, even in a strongly magnetically insulated line, downstream of the remaining POS plasma. Opening is assumed to occur at the cathode, either by erosion or push-back. The loss results only when a large voltage appears after opening into a high-impedance load. Then the difference in potential between the plasma, which is near anode potential, and the cathode results in an axial component of E at the load end of the plasma, which supports an E*B drift of electrons across the gap. The analytic model predicts that this loss should increase with higher voltage after opening and can be eliminated only by removing the plasma from the gap or eliminating cathode electron emission (both difficult), or by confining this downstream electron flow with an applied magnetic field.<<ETX>>","PeriodicalId":165717,"journal":{"name":"IEEE 1989 International Conference on Plasma Science","volume":"16 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":"124094706","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
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