2012 14th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)最新文献

{"title":"Multi-module system for fast-rising high-voltage pulse formation","authors":"V. A. Demidov, S. Kazakov, A. S. Boriskin, A. A. Agapov, E. V. Shapovalov","doi":"10.1109/MEGAGAUSS.2012.6781448","DOIUrl":"https://doi.org/10.1109/MEGAGAUSS.2012.6781448","url":null,"abstract":"Matching devices in the form of electro-exploded (EEOS) or explosive (EOS) opening switches are used for transforming current pulses of magneto-cumulative generators (MCG) into voltage pulses of hundreds kilovolts at high-impedance loads. Current pulse sharpening is accompanied by significant losses of the stored energy. Using EOS is more preferable compared to EEOS from the point of view of the energy losses since it does not lead to efficiency decrease of the MCG operation. The paper considers magneto-cumulative multi-module systems (MCMS) consisting of several synchronously operating and serially connecting small helical MCG generators. Each generator equipped with the explosive current opening switch. Voltages, generated at each opening switch, are summarized into the load. Fast operation of the MCG allows using very thin foils in the opening switches, and obtaining short voltage pulse front. Results of the works on creating high-voltage devices based on helical MCG of 60 mm diameter and disk EOS of 200 mm diameter are presented in the paper. In the experiment the device consisting of two modules provides the voltage pulse of 370 kV with the rise time of ~100 ns into the load of 27 Ω and inductance of 0.5 μH.","PeriodicalId":299352,"journal":{"name":"2012 14th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)","volume":"62 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127979623","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}

{"title":"Coaxial transmission line with minimal inductance","authors":"K. G. Gainullin","doi":"10.1109/MEGAGAUSS.2012.6781447","DOIUrl":"https://doi.org/10.1109/MEGAGAUSS.2012.6781447","url":null,"abstract":"Many applied projects concern with transmission line which inductance is parasitic. Thus, the problem to minimize the inductance value is urgent. In the present work the form of coaxial transmission line was determined for given positions of generator output and load input. The results achieved may be applied for magnetic flux transfer from the explosion driven generators (or another magnetic flux storage) to the liner load.","PeriodicalId":299352,"journal":{"name":"2012 14th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)","volume":"70 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126800100","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}

{"title":"Autonomous magneto-cumulative energy source","authors":"V. A. Demidov, V. D. Sadunov, S. Kazakov, S. N. Golosov, A. A. Utenkov, A. S. Boriskin, M. V. Antipov, A. Blinov, I. V. Yurtov, L. N. Plyashkevich","doi":"10.1109/MEGAGAUSS.2012.6781446","DOIUrl":"https://doi.org/10.1109/MEGAGAUSS.2012.6781446","url":null,"abstract":"Helical magneto-cumulative generator (MCG) powered from explosive piezo-generator (EPG) is the most compact device among modern sources having output energy of 1-10 kJ. EPG matches well MCG on nature of their operation and design parameters; they are simple in use and do not require transforming and switching devices. The paper presents results of work on creating autonomous small energy source based on EPG and MCG. The energy on the piezogenerator output reaches ~25 J at the expense of double-sided shock loading of the EPG piezoceramic unit. The energy is transmitted to the helical MCG with the initial inductance of ~1000 μH. Constructively the energy source is constructed both in the form of a monoblock of ~2 dm3 volume, and the form of two separate units, connected with high-voltage cable.","PeriodicalId":299352,"journal":{"name":"2012 14th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)","volume":"120 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120958218","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}

{"title":"Analysis of inductively driven liners for the generation of megagauss magnetic fields","authors":"J. Slough, A. Pancotti, D. Kirtley","doi":"10.1109/MEGAGAUSS.2012.6781434","DOIUrl":"https://doi.org/10.1109/MEGAGAUSS.2012.6781434","url":null,"abstract":"A process for achieving megagauss fields to reach fusion gain conditions based on the compression of a Field Reversed Configuration plasmoid (FRC) is analyzed. The essential element for achieving this end is the inductively driven implosion of several thin bands of metal, initially at large radius, to achieve the 3D convergence and mass required. To understand the issues involved with this approach, as well as design an experimental test, a 1D analytical model was developed and 3D ANSYS Explicit Dynamics® of the liner implosion were carried out. The inductive coupling and drive efficiency of the compression for a single liner was evaluated with the one dimensional model which included the key circuit, magnetic field and liner parameters. The model was then used to characterize the liner motion as a function of liner mass, resistivity, stored energy, coil voltage and initial magnetic field. The stability and structural behavior of multiple liners was studied with the 3D ANSYS code. Techniques for controlling liner bucking as well as liner rotation for Rayleigh-Taylor stability were formulated and examined with these codes.","PeriodicalId":299352,"journal":{"name":"2012 14th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"131125188","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}

{"title":"History and tribute to V. Mokhov","authors":"S. F. Garanin","doi":"10.1109/MEGAGAUSS.2012.6781411","DOIUrl":"https://doi.org/10.1109/MEGAGAUSS.2012.6781411","url":null,"abstract":"Vladislav Nikolaevich Mokhov, an outstanding scientist, Doctor of Science in Physics and Mathematics, professor, died on December 27, 2011 after long time of severe disease. Before this illness he was Deputy Scientific Leader of the All-Russian Research Institute of Experimental Physics (VNIIEF). V.N. Mokhov was born on April 12, 1931 in the town of Atkarsk, Saratov region, Russia. In 1955, after graduation from the Moscow Engineering Physics Institute, he in a group of the most brilliant and talented young theoreticians was selected by Academicians Ya.B. Zel'dovich and A.D. Sakharov for work on the nuclear weapons program at VNIIEF. In 1963, he was awarded the Lenin Prize for the development of new principles and new approaches to nuclear and thermonuclear weapons design and controlled fusion; in 1964, he received the degree of Candidate of Science, and four years later, the degree of Doctor of Science. V.N. Mokhov was always inspired by challenging projects that required teamwork of theoreticians, designers, and experimentalists. His major scientific and practical results include: Development of the theory of turbulent mixing in layered structures at intense compression. The results obtained are relevant for studying the processes occurring in inertial confinement fusion (ICF) targets.; Ignition of thermonuclear fuel by its heating with fast compression, which was and continues to be very important for the development of a number of special-purpose nuclear charges and fusion targets.; Development of “clean” nuclear charges for peaceful applications (jointly with the team of colleagues).; The new approach to the controlled thermonuclear fusion - the MAGO (MAGnitnoye Obzhatiye, or magnetic compression) - was proposed and developed jointly with his team. V.N. Mokhov considered MAGO to be a system that now made it possible to achieve the scientific breakeven point for fusion without the large initial capital investment that is required by the two more conventional approaches, magnetic confinement fusion and ICF.; Investigation of physical properties of materials at high energy densities provided by explosive magnetic flux compression generators (EMG). Jointly with his team, V.N. Mokhov proposed and developed methods of this investigation, obtained novel results on dynamic strength of a number of materials (aluminum, copper, polyethylene). In 1998, he and some of his colleagues were awarded the RF Government Prize for the development of EMGs and their application for scientific investigations. V.N. Mokhov was one of the pioneers of scientific cooperation between US and Russian nuclear laboratories. This mutually beneficial cooperation between the two countries produced extremely interesting scientific results obtained during joint research activities, including more than 20 series of experiments, and published in more than 400 papers and presentations. Equally important is that he was a true friend of many US scientists, and this friendship between ","PeriodicalId":299352,"journal":{"name":"2012 14th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)","volume":"92 5","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"120882800","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}

{"title":"A thermonuclear system based on Z-pinch formed by current of an explosive magnetic generator (disk project)","authors":"S. G. Garanin, A. V. Ivanovsky, L. S. Mkhitariyan","doi":"10.1109/MEGAGAUSS.2012.6781426","DOIUrl":"https://doi.org/10.1109/MEGAGAUSS.2012.6781426","url":null,"abstract":"It is known that a thermonuclear target can be ignited by an implosion accomplished with X-radiation generated by means of laser radiation conversion or by a Z-pinch formed by a high-power current pulse. For these purposes laser facility NIF has been constructed in the USA, “Megajoule” is being constructed in France, and there is a project of laser facility “UFL-2M” in Russia. The project of stationary facility X has been developed in SNL USA to produce a Z pinch capable of generating an x-ray pulse with parameters close to the ignition threshold. There is a chance that the already tested technologies, including disk explosive magnetic generators (DEMG), systems of current peaking based on electrically exploded foil opening switches, and high-voltage switching devices can be used to provide the quickest and cheapest way to resolve the problem of the ignition feasibility. To explore this possibility, the paper will sequentially analyze the target ignition conditions. The required parameters of Z pinch X-radiation and the size of the DEMG-based facility to obtain these parameters will be evaluated. Capabilities of the current sources based on the DEMG and of the devices shaping a current pulse will be presented and compared to those required for the target ignition.","PeriodicalId":299352,"journal":{"name":"2012 14th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"121004499","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}

{"title":"Seeded Magneto Rayleigh-Taylor instability driven by a 1-MA Linear Transformer Driver","authors":"D. Chalenski, R. Gilgenbach, Y. Lau, Sonal G. Patel, A. Steiner, David Yager-Eliorraga, I. Rittersdorf, M. Weiss, M. Franzi, Peng Zhang, J. Zier","doi":"10.1109/MEGAGAUSS.2012.6781453","DOIUrl":"https://doi.org/10.1109/MEGAGAUSS.2012.6781453","url":null,"abstract":"Experimental, theoretical and simulation research investigations are underway on the Magneto Rayleigh-Taylor instability driven by the Mega Ampere Linear Transformer Driver at the University of Michigan. Since the Linear Transformer Driver operates at 100- kV output, inductance minimization was crucial in design of the coaxial and radial magnetically insulated transmission line that transmits power to the load. Experiments ablate a 400 nm-thick, 1 cm wide, planar, aluminum foil located between two parallel-plate anodes. The initial position of the foil relative to the anodes controls the foil-plasma acceleration. Laser-micromachined, periodic hole patterns on foils are utilized to seed the wavelength of Magneto Rayleigh-Taylor growth. Sub-ns laser shadowgraphy diagnoses the instability growth at the edges of the ablation plasma. Early instability is believed to originate from the Electro-Thermal instability. Later exponential growth rates have been measured whose trends are consistent with Magneto Rayleigh Taylor theory. As expected, the fastest Magneto Rayleigh-Taylor growth rate corresponds to the largest foil-plasma acceleration. Effects of magnetic shear on Magneto Rayleigh-Taylor growth have been predicted theoretically.","PeriodicalId":299352,"journal":{"name":"2012 14th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)","volume":"126 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115890234","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}

{"title":"1 MJ electromagnetic compressor of a strip type with electrical current output into a loading","authors":"A. P. Lototskiy, Ugeni V. Grabovskiy, V. P. Bakhtin, N. Efremov, M. K. Krylov, G. N. Homutinnikov, N. M. Umrikhin, M. Galanin, A. Rodin","doi":"10.1109/MEGAGAUSS.2012.6781428","DOIUrl":"https://doi.org/10.1109/MEGAGAUSS.2012.6781428","url":null,"abstract":"Two series of experiments on the magnetic compressor (MC): with magnetic flow compression and electrical current output in the external loading are carried out. A megajoule capacitor battery is used as primary source of energy. The deformation dynamics of the liner material consisting of two flat plates, accelerated towards each other is investigated. The new scheme of electromagnetic acceleration, which automatically creates a magnetic flow in a compression zone, is used. At velocity of plates of 1 km/s the output electrical current of MC exceeds 4 MA. The results of modeling coincide with the experiment data with satisfactory accuracy. The MC device is intended for a power amplification of the inductive store of installation “MOL”.","PeriodicalId":299352,"journal":{"name":"2012 14th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)","volume":"84 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115217387","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}

{"title":"The effect of the strong magnetic field on the process of ignition in the magnetized plasma","authors":"Xianjun Yang, Hua Zhang, Z. Dong","doi":"10.1109/MEGAGAUSS.2012.6781432","DOIUrl":"https://doi.org/10.1109/MEGAGAUSS.2012.6781432","url":null,"abstract":"The fusion of magnetized plasma is a hot topic in recent years, in which MTF (Magnetized Target Fusion) is a new approach to producing fusion power,. In this paper, we investigate the simple model as well as 1D MHD simulation to study the parameter space of the ignition condition for the magnetized plasma. The detailed analysis and simulation results show that the strong magnetic field will suppress the energy loss of the thermal conduction and increase the energy gain from alpha particle deposition during the compression. We obtain the parameter space of confinement parameter, magnetic field strength and the plasma temperature for high-temperature magnetized plasma to reach the ignition condition. The magnetic field configurations and radical temperature profiles of the magnetized plasma are obtained with 1D MHD with suitable external pulsed power. It shows that the ignition conditions computed from 1D MHD simulation is in accordance with the simple analytic model.","PeriodicalId":299352,"journal":{"name":"2012 14th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)","volume":"34 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114428009","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}

{"title":"Biot-Savart for bifurcation, BSBIF","authors":"J. Chase, G. Peterson","doi":"10.1109/MEGAGAUSS.2012.6781449","DOIUrl":"https://doi.org/10.1109/MEGAGAUSS.2012.6781449","url":null,"abstract":"To this date, most (perhaps all) computer simulations and models (including Care'n Co.'s code CAGEN [1]) that are capable of being used to predict the behavior of helical flux compression generators (HFCG) approximate both the helicity of the windings and the bifurcations. The spiral nature of the windings is approximated with loops that lie in a plane perpendicular to the axis of the HFCG. Perhaps the most notable approximation is the assumption that the currents in each of the bifurcate legs are equal. There have been a few experiments that have measured the currents in each “parallel” winding separately, and those measurements have shown that the currents are not equal (none of these experiments have been published). The concern, then, is that the electrical fields within the HFCG will not be represented accurately by those approximations. To examine these short falls, The Care'n LLC has developed a HFCG modeling code that treats the windings in their actual spiral and bifurcated form and, further, allows the currents in each wire to be computed self consistently. This code is called (for the time being) BSBIF standing for Biot-Savart BIFurcation. The details of BSBIF, its implementation, running speeds, and comparisons to CAGEN are presented. No bifurcation issues regarding internal electrical breakdown have been found.","PeriodicalId":299352,"journal":{"name":"2012 14th International Conference on Megagauss Magnetic Field Generation and Related Topics (MEGAGAUSS)","volume":"6 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2012-10-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124875743","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}