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Kashirskoye, Russia

Rashchikov V.I.,NRNU MEPhI
24th Russian Particle Accelerator Conference, RuPAC 2014 | Year: 2014

Computer simulation of deuteron beam from ion source acceleration in gas-filled neutron tube has been fulfilled. Fully relativistic electromagnetic particle-in-cell finite difference, time-domain cod SUMA [1-2] has been used to investigate the ionization and knock on processes and there influence on deuteron beam and output neutron flow parameters. When deuteron and ionized particles space charge self-field forces become the same order of magnitude as external one, virtual cathode may occurs. It is happens because of injected from ion source deuterons cannot overcome their own space charge potential wall and move in transverse direction. However, electrons, produced by ionization, are trapped within the deuteron beam space charge potential wall and decrease it significantly. Thus, space charge neutralization of deuteron beams by electrons, may considerably increase target current and, as a result, output neutron flow. The data obtained were compared with experimental results. © 2014 CC-BY-3.0 and by the respective authors. Source

Mirnov S.V.,SSC PF TRINITI | Belov A.M.,SSC PF TRINITI | Djigailo N.T.,SSC PF TRINITI | Kostina A.N.,NRNU MEPhI | And 4 more authors.
Journal of Nuclear Materials | Year: 2013

The T-11M lithium program is focused to find solutions for technological issues of a steady-state toka-mak. A recent lithium activity in T-11M was focused on three directions: investigation of different Li-lim-iters, investigations of long-term effects of lithium behavior in hydrogen plasmas and development of a new kind of CPS limiters. The new so-called R limiter has been used as Li collector for investigation of lithium fluxes near the plasma boundary and chamber walls. It was shown, that the Li circulation near the limiter exceeds up to four times the primary lithium flux from limiters. 90% of primary flux is collected by lateral sides of limiter and only 10% arrives at the chamber wall. The deuterium glow discharge was used to test the long-term lithium degradation under the deuterium bombardment. It was shown that such degradation is small. That means that the Li-limiter can be used as Li-emitter in steady-state tokamak operation. A new vertical lithium limiter was successfully tested in T-11M. © 2013 Elsevier B.V. All rights reserved. Source

Mirnov S.V.,NRNU MEPhI
Plasma Physics and Controlled Fusion | Year: 2016

It was noted earlier [1] that high performance regimes of many tokamaks were achieved in the condition of plasma heating power P H limited from above. The exceeding of this limit usually ended as a plasma collapse. The analysis of the high performance regimes of well known tokamaks which operated during the last 50 years has shown that the values of such 'permissible' P H grow approximately linearly with the area S of the first wall surface facing to the plasma. The paper attempts to explain the existence the P H/S limit for high performance tokamak regimes as a consequence of the vacuum breakdown of the plasma sheath in the area of a plasma contact with the vessel wall and unipolar arcs which followed it. © 2016 IOP Publishing Ltd. Source

Korneev P.,NRNU MEPhI | Becker W.,Max Born Institute for Nonlinear Optics and Short Pulse Spectroscopy
Laser Physics Letters | Year: 2010

The nonequilibrium nanoplasma created by irradiation of a cluster, or other nanosystems such as large molecules, with an intense infrared-laser field may be used as an amplifying medium for a high-frequency probe field. We employ a simple description where the nanosystem is modeled by particles bound by a self-consitent potential. An incident probe field suffers gain or loss depending on the respective parameters by a mechanism-2 that is usually referred to as collisionless damping. The model is simple enough to allow for an essentially analytical solution. © 2010 by Astro Ltd. Source

Korneev P.,NRNU MEPhI | D'Humieres E.,French National Center for Scientific Research | Tikhonchuk V.,French National Center for Scientific Research
Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | Year: 2015

A simple setup for the generation of ultra-intense quasistatic magnetic fields, based on the generation of electron currents with a predefined geometry in a curved snail (or 'escargot') target, is proposed and analyzed. Particle-in-cell simulations and qualitative estimates show that gigagauss scale magnetic fields may be obtained with existent laser facilities. The described mechanism of the strong magnetic field generation may be useful in a wide range of applications, from laboratory astrophysics to magnetized inertial confinement fusion schemes. © 2015 American Physical Society. Source

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