Keyword: plasma
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WECAMH03 Analysis of the Particle Dynamics Stability in the Penning-Malmberg-Surko Trap dipole, cyclotron, scattering, experiment 64
 
  • I.N. Meshkov
    JINR, Dubna, Moscow Region, Russia
  • M.K. Eseev
    NAFU, Arkhangelsk, Russia
  • I.N. Meshkov, A.D. Ovsyannikov, D.A. Ovsyannikov, V.A. Ponomarev
    Saint Petersburg State University, Saint Petersburg, Russia
 
  Present report refers to the problem of the study of charged particle dynamics in the Penning-Malmberg-Surko trap. Various models of particle dynamics describing the magnetron and cyclotron motions are considered. Representation of the solutions in the form of a series is used for the magnetron motion. The problems of the stability of the magnetron motion are investigated.  
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TUPSA020 Installation for the Research of Z-Pinch Plasma Initiated by the Electron Beam electron, focusing, gun, luminosity 258
 
  • A.A. Drozdovsky, A.V. Bogdanov, S.A. Drozdovsky, R. Gavrilin, A.V. Kantsyrev, V.A. Panyushkin, I. Roudskoy, S.M. Savin, V.V. Yanenko
    ITEP, Moscow, Russia
  • P.V. Sasorov
    Keldysh Institute of Applied Mathematics, Moscow, Russia
  • V.V. Yanenko
    MEPhI, Moscow, Russia
 
  For researches on plasma physics has been designed and constructed the electronic gun with the cold cathode on energy to 300 keV. The gun have the parameters: time width of pulses -100 ns, current amplitude - 100 A. The adiabatic plasma lens is developed for transportation and compression of the received electron beam. Results of researches are presented.  
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TUPSA029 High Power Solid State RF Generator for Neutral Beam Injector controls, power-supply, neutral-beams, impedance 276
 
  • E. Shubin, V.V. Kolmogorov
    BINP SB RAS, Novosibirsk, Russia
  • A.S. Styuf
    NSU, Novosibirsk, Russia
 
  Neutral Beam Heating Injector of 1 MW beam power for the TCV tokamak (Lausanne, Switzerland) was developed in BINP. The plasma is formed in a plasma box with inductively coupled RF power at frequency about 4 MHz. Required RF power in the plasma box is up to 40 kW during the period of 2 seconds with 5 minutes intervals. Solid state RF generator with such capability has been developed in BINP. The generator has a modular structure with combining RF power of 16 identical modules. Output RF power of the generator is regulated by DC power supply voltage. At present Injector is working at TCV. Description of the RF generator design, main features and the test results are presented in the report.  
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TUPSA031 The Cascade Interference Switch Comprising a Transmission Resonator cavity, simulation, distributed, high-voltage 282
 
  • S.A. Gorev, S.N. Artemenko, V.S. Igumnov
    TPU, Tomsk, Russia
 
  The new concept of microwave interference switches is reported. Interference switch is based on series of H-plane T-junctions (cascade switch) in the view of decreasing switched power at Off state and comprises irises in both its own input and output arms. At On state the irises act as a transmission resonator localizing the nodes of the standing wave at the junctions. Such distribution is expected to decrease the plasma losses. It was shown with a simulation that the cascade switch with additional irises increases the efficiency of the active microwave compressors. The simulation was made with CST studio and COMSOL.  
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TUPSA041 High-Energy Micro-Buncher Based on the mm-Wavelength Dielectric Structure proton, electron, wakefield, quadrupole 303
 
  • A.V. Petrenko
    CERN, Geneva, Switzerland
  • I.L. Sheinman
    LETI, Saint-Petersburg, Russia
 
  The proton-driven plasma wakefield acceleration is a recently proposed technique promising a GeV/m rate of acceleration to a TeV-scale energy in a single plasma stage. In order to excite high-amplitude plasma wakefields a long proton bunch from a synchrotron should be broken into a sequence of sub-mm long micro-bunches which can drive the plasma oscillations resonantly. We suggest a novel approach to produce the required train of micro-bunches using collinear wakefield acceleration in a dielectric-loaded structures. First the energy modulation is introduced into the proton beam with the help of the mm-wavelength dielectric accelerating structure. Then the energy modulation is transformed into the longitudinal micro-bunching using proton beamline with magnetic dipoles. Beam dynamics simulations were used to find the appropriate parameters of the dielectric accelerating structure, driving electron bunch and the beam focusing system.  
poster icon Poster TUPSA041 [0.792 MB]  
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TUPSA062 Modeling of Triode Source of Intense Radial Converging Electron Beam electron, cathode, target, simulation 336
 
  • V.V. Altsybeyev, V.I. Engelko, A.D. Ovsyannikov, D.A. Ovsyannikov, V.A. Ponomarev
    Saint Petersburg State University, Saint Petersburg, Russia
  • R. Fetzer, G. Müller
    KIT, Karlsruhe, Germany
 
  The considered source of triode type produces intense radial converging electron beam for irradiation of cylindrical targets. As an electron emitter an explosive plasma cathode is used. The role of initial transverse velocities of electrons, defocusing effect of the controlling grid, the beam self-magnetic field, electron and ion emission from the controlling grid, backscattering of electrons and ion flow from the target is analyzed. Conditions for achieving required electron beam parameters (the electron kinetic energy - 120 keV, the beam energy density on the target 40 J/cm2 on a maximum possible length of the target surface) were determined.  
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WEPSB007 On Application of Monte Carlo Method for Poisson Problem Solving electron, controls, lattice, simulation 367
 
  • L.V. Vladimirova, I.D. Rubtsova
    St. Petersburg State University, St. Petersburg, Russia
 
  The paper presents the application of random grid walk for Dirichlet problem solving for Poisson equation. Boundary value problem is discretized and reduced to the system of linear algebraic equations. The matrix of this system is used for stochastic matrix constructing. Thus, there is a possibility of Markov chains obtaining. The special random value is defined on Markov chain trajectories; this value is used for approximation of the desired solution. The advantages of this method are discussed in the paper. The algorithm is applied for electric potential calculation in the cell of support lattice of exit window in large-aperture electron accelerator.  
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WEPSB008 About Behavior of Electrons and Ions in the Accelerating Interval ion, electron, acceleration, vacuum 371
 
  • A.S. Chikhachev
    Allrussian Electrotechnical Institute, Moskow, Russia
  • H.Y. Barminova
    MEPhI, Moscow, Russia
 
  The behavior of electron-ion ensemble accelerated in the diode is studied. Hot electrons are described by means of the distribution function which is a solution of the collisionless kinetic function depending not only from integrals of motion. To describe the cold ions the hydrodynamics equations are used. The possibility of the ion-sound velocity excess of the ions is shown. The expression for the electron gas pressure is received. The dependence of relative density of the ions on the coordinate is discussed in the case of closed phase trajectories.  
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WEPSB015 On the Integro-Differential Equations for Dynamics of Interacting Charged Particles Modeling simulation, electromagnetic-fields, controls, focusing 392
 
  • D.A. Ovsyannikov
    St. Petersburg State University, St. Petersburg, Russia
  • N.S. Edamenko
    Saint Petersburg State University, Saint Petersburg, Russia
 
  In this paper we investigate the integro-differential model for the dynamics of charged particles with smooth interaction for the analysis and optimization of intense charged particle beams motion in accelerating and focusing structures. Introduced mathematical models allows us to calculate the first variation of the different functionals characterizing the desired parameters of accelerators in analytical form. Thus mathematical model can be effectively used in the analysis and optimization of charged particles dynamics in accelerators.  
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WEPSB056 Study of Oil Wells With the Use of Accelerator Tubes, Time and Energy Spectrometers of Neutrons and Gamma Rays in a Single Geophysical Complex neutron, radiation, vacuum, laser 490
 
  • A.E. Shikanov, B.Y. Bogdanovich, A.V. Il'inskiy, A.A. Isaev, K.I. Kozlovskiy, A. Nesterovich, E.D. Vovchenko
    MEPhI, Moscow, Russia
 
  The report discusses the finding of the coefficient of oil saturation of the reservoir by of nuclear methods. For this purpose, the data about pulse and the activation neutron logging and spectral logging of natural gamma activity are used in a single geophysical complex. As sources of neutron radiation can been applied accelerating tube (AT) based on different ion sources, such as plasma discharge with oscillating electrons (gas AT), vacuum arc and laser-plasma (vacuum AT). For investigation of the oil reservoir, in particular with heavy oil, we discuss the prospects of using vacuum accelerating tube based on a laser-plasma source of deuterons with coaxial acceleration geometry and pulsed magnetic isolation of electrons.  
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WEPSB074 High Current Pulsing Deuteron Accelerator with Energy of 500 keV laser, neutron, experiment, cathode 527
 
  • A.A. Isaev, K.I. Kozlovskiy, A.E. Shikanov, E.D. Vovchenko
    MEPhI, Moscow, Russia
 
  It is reported on the development of a compact experimental model of the deuteron accelerator with energies up to 400 KeV. The ion current is about 1 kA and the current density is greater than 20 A/cm2 in pulses with a duration of 0.5 mks and a repetition rate of 1 Hz. In this accelerator, we applied the effective ion source of laser-plasma and the optimized method of magnetic insulation of the electrons in the accelerating gap.  
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THPSC006 Simulation of Precision Magnetic Shielding System for Beam Injectors in Tokamaks operation, shielding, simulation, ion 550
 
  • A.M. Bazarov, V.M. Amoskov, V.A. Belyakov, E.I. Gapionok, V.P. Kukhtin, E.A. Lamzin, S.E. Sytchevsky
    NIIEFA, St. Petersburg, Russia
  • V.A. Belyakov, S.E. Sytchevsky
    Saint Petersburg State University, Saint Petersburg, Russia
  • Y. Gribov
    ITER Organization, St. Paul lez Durance, France
 
  Beam injectors in tokamaks are utilized for plasma heating and diagnostics. Due to the relatively large distance between the injectors and plasma, the tokamak stray magnetic field inside injectors during the operation should be very low (down to the tenths of Gauss) to avoid the deflection of the ion beams. The Magnetic Field Reduction System (MFRS) should be used to reduce the stray magnetic field produced by the tokamak EM systems and plasma to an acceptable level inside the injectors. In total, the complex MFRS can consist of a passive magnetic shield and active coils to provide the strict design criteria during a plasma scenario. To provide precise computations, detailed numerical models of MFRS should have the dimensions up to several tens of millions of degrees of freedom. Such problem could be solved only with the use of high-efficiency vector algorithms and parallel computations. The paper is dedicated to simulation of MFRS for beam injectors in tokamaks.  
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THPSC007 Modeling Magnetic Effects of Steel Rebar of Concrete Surroundings for Electrophysical Apparatus simulation, shielding, experiment, operation 553
 
  • V.M. Amoskov, A.M. Bazarov, V.A. Belyakov, M. Kaparkova, V.P. Kukhtin, E.A. Lamzin, B.V. Lyublin, S.E. Sytchevsky
    NIIEFA, St. Petersburg, Russia
  • V.A. Belyakov, S.E. Sytchevsky
    Saint Petersburg State University, Saint Petersburg, Russia
  • Y. Gribov
    ITER Organization, St. Paul lez Durance, France
 
  Large electrophysical apparatus (accelerators, detectors, tokamaks, stellarators) usually produce strong magnetic fields, which magnetizing surrounding ferromagnetics (steel masses). For example, concrete structures of buildings are reinforced with steel rebar that can produce a local substantial contribution into the magnetic field in the area where the service staff and magnetically sensitive equipment is located. The article describes an advanced approach to modelling magnetic properties of reinforced concrete structures taking into account the anisotropic effect due to rod layers orientations. The equivalent model has been validated in the computation of a test problem. For comparison, simulations have been carried out with a detailed 3D FE model that describes each of the steel rods. The equivalent model has required a few times less finite elements than the detailed model. A comparison of the fields obtained has demonstrated a very good match, even for the distances comparable with the rebar rod gaps.  
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THPSC025 Generator of High-Voltage Pulse for High-Current Accelerator of Deuteron With Laser Starts laser, high-voltage, cathode, electron 594
 
  • E.D. Vovchenko, A.A. Isaev, K.I. Kozlovskiy, A.E. Shikanov
    MEPhI, Moscow, Russia
 
  The report deals with the source of pulsed high voltage, and simultaneously, source of the pulsed current for the magnetic insulation of electrons near the cathode that was developed for a high-current accelerator of deuterons with laser-plasma anode. The accelerating voltage up to 400 kV and ion current about 1 kA have been achieved. The current in the spiral inductor has reached 4 kA and it excludes breakdown between the cathode and anode for 0.5 mks. For synchronization of physical processes in accelerator of deuterons with pulsed power, the laser control is applied.  
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THPSC028 Switching Network Units for High Currents and Voltages or Plasma Applications network, operation, controls, solenoid 603
 
  • M.P. Pretelli, F. Burini, G.T. Taddia, S.M. Tenconi
    OCEM, Valsamoggia, Italy
  • A. Lampasi, P. Zito
    ENEA C.R. Frascati, Frascati (Roma), Italy
 
  OCEM and ENEA gained a wide experience in the design and experimental characterization of fast and accurate switching systems for high DC currents, as required to supply magnets and superconductors. The exploited idea consists in inserting an electronic switch in parallel to a light electromechanical switch in air to combine the benefits of both devices. The electronic switch is turned on and off to support the electromechanical commutations limiting their jitter and the arcs that would reduce the system lifetime. During the already performed tests, DC currents up to 20 kA were diverted in less than 100 mks with good repeatability. In case of emergency, the current can be interrupted in few tens of milliseconds. A resistor can be inserted in parallel to the switch to discharge inductive loads or to produce desired overvoltages (a voltage up to 5 kV was reached in this configuration). Specific circuits were designed to preserve the components from transient voltage overshoots. This switching system is expected to work for 10000 operations without major maintenance. The developed solutions may be extended to many relevant applications as particle accelerators and HVDC networks.  
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THPSC047 A Faraday Cup for a Low Charge LWFA Electron Beam Measurement electron, laser, simulation, acceleration 635
 
  • V. Gubin, V.I. Trunov
    Institute of Laser Physics, SB RAS, Novosibirsk, Russia
  • V.V. Gambaryan, A.E. Levichev, Yu. Maltseva, P.V. Martyshkin, A.A. Pachkov, S.N. Peshekhonov
    BINP SB RAS, Novosibirsk, Russia
 
  Nowadays laser wakefield acceleration (LWFA) is considered as one a perspective method for GeV electron beam production. Combination of laser accelerated electrons and Compton backscattering of probe light beam opens possibility to create the table top source of femtosecond light beam in x-ray and gamma range. Project of laser-driven Compton light source started in ILP SB RAS in collaboration with BINP SB RAS. Production of 1-10 pC electron beams sub-ps time range duration with energies up to 100 MeV is expected as a result of the first stage of the project. Since energy of electrons does not exceed of 100 MeV, it allows using Faraday cup (FC) with reasonable dimensions, instead of commonly used integrating current transformer (ICT). Geometry of FC was optimized taking into account of beam stopping simulation as well as low capacity requirement. RF properties, simulation of the system operation were carried out. System has been tested at the VEPP-5 electron linac. Results of development and testing of this FC are presented.  
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