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Пустовитов, Владимир Дмитриевич

Организационные подразделения

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Институт лазерных и плазменных технологий

Стратегическая цель Института ЛаПлаз – стать ведущей научной школой и ядром развития инноваций по лазерным, плазменным, радиационным и ускорительным технологиям, с уникальными образовательными программами, востребованными на российском и мировом рынке образовательных услуг.

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Пустовитов

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Владимир Дмитриевич

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Теперь показываю 1 - 10 из 14

Только метаданные
Extension of Shafranov’s Equilibrium Theory to the Description of Current Quenches Affected by Resistive Wall Dissipation in Tokamaks
(2019) Pustovitov, V. D.; Пустовитов, Владимир Дмитриевич
© 2019, Pleiades Publishing, Ltd.Abstract: An equation for the plasma column position in a tokamak is derived with account of the resistive wall reaction on the changes in the plasma. A similar problem was considered by V.D. Shafranov [J. Nucl. Energy C 5, 521 (1963)] but for a fixed plasma current. Here, this current is treated as time-dependent, which allows to cover the current quenches and expand the study to the analysis of disruptions. It is shown that the net toroidal current induced in the wall during the current quench (which is not accounted for in the mentioned and related existing analytical models) can strongly affect the plasma equilibrium. A general algorithm applicable to arbitrary tokamaks is presented. For a large-aspect-ratio “circular” tokamak a full cycle of the step-by-step reduction of a problem is carried out down to the equation for the plasma shift evolution. The technique and results are ready for use with standard equilibrium solvers and models.
Только метаданные
Effect of Pressure Anisotropy on Diamagnetic Signal in a Tokamak with Noncircular Plasma Cross Section
(2021) Ryabushev, E. A.; Pustovitov, V. D.; Пустовитов, Владимир Дмитриевич
© 2021, Pleiades Publishing, Ltd.Abstract: The relation is analyzed between the diamagnetic signal and the current and pressure of anisotropic plasma in a tokamak. Such a relation is well-known for the cylindrical plasma with a circular cross section, but, in this study, the plasma shape is assumed to be arbitrary, and both the system toroidicity and plasma anisotropy are accounted for. This considerably complicates the calculations and requires the integration of the generalized Grad–Shafranov equation. The analytical derivations are performed by the scheme used for the isotropic plasma in [V. D. Pustovitov, Fusion Eng. Des. 117, 1 (2017)]. Estimates are made for a large group of terms arising due to the anisotropy, and the main effect is extracted. The result is ready for practical use.
Только метаданные
Electromagnetic Estimates of the Internal Inductance in Tokamaks
(2023) Pustovitov, V. D.; Пустовитов, Владимир Дмитриевич
Открытый доступ
Modeling of Heat Pulse Propagation During TESPEL Injection into the LHD Plasma
(2019) Sergeev, V. Y.; Dnestrovskiy, A. Y.; Frolov, V. E.; Pustovitov, V. D.; Пустовитов, Владимир Дмитриевич
Anomalous transport is a paradigm for analysis of both Power Balance (PB) and Heat Pulse Propagation (HPP) in magnetically confined plasmas including so called non-local transport (NLT) phenomena (core heating as a reaction on the edge cooling). One of the alternative explanations of the NLT proposes to take into account the plasma motion caused by the perturbation of the force balance during HPP. First results of numerical modeling of the electron heat transport by the ASTRA code confirm the viability of this approach. (C) 2019 The Japan Society of Plasma Science and Nuclear Fusion Research
Открытый доступ
General Approach to the Evolving Plasma Equilibria with a Resistive Wall in Tokamaks
(2023) Pustovitov, V. D.; Chukashev, N. V.; Пустовитов, Владимир Дмитриевич
The dynamic problem of plasma equilibrium in a tokamak is considered taking into account the electromagnetic reaction of the vacuum vessel resistive wall. The currents induced in the wall during transient events contribute to the external magnetic field that determines the plasma shape and position. Accordingly, the plasma geometry must evolve so that the inductive excitation of the wall current would properly compensate for the resistive losses. Simultaneous consideration of these factors presents the main difficulty of the description. It is performed in a general form using the GreenвЂ™s function method that guarantees the mathematical accuracy of expressions for the magnetic fields from each source. At the same time, it is desirable to minimize the related complications, which is one of the goals here. The starting point is the standard solution of the external equilibrium problem given by integral relating the poloidal magnetic flux to the magnetic field at the plasma boundary. In the evolutionary problem, the additional equations for the plasma-wall electromagnetic coupling are transformed to an equation with a similar integral over the wall, but with either the time derivative of the poloidal magnetic flux or the wall current density in the integrand. The mentioned similarity allows to use the already developed techniques, which makes this formulation compact and convenient. It provides the basis for extension of the existing analytical theory of equilibrium to the case with non-circular plasma and wall.
Только метаданные
Analytical Solution to External Equilibrium Problem for Plasma with Elliptic Cross Section in a Tokamak
(2021) Chukashev, N. V.; Pustovitov, V. D.; Пустовитов, Владимир Дмитриевич
© 2021, Pleiades Publishing, Ltd.Abstract: Expressions are obtained for the magnetic field created by the currents flowing in the tokamak plasma with elliptic cross section. The analytical approach is based on the Green function method, which ensures the exact separation of the desired solution for given boundary conditions and its correct asymptotic behavior at infinity. The system toroidicity is retained in the linear approximation, as it is done in the standard models of the equilibrium theory, but the magnetic field B at the plasma boundary is described with account for the second harmonic in the poloidal angle. This fact, as well as the noncircular shape of the plasma boundary, on which the inner and outer solutions for the field B must be matched, radically changes the nature of the problem. A detailed description of the techniques for including new elements into the general scheme is given. The result is presented in terms of the poloidal flux as a function of coordinates; its gradient determines the local values of the self field.
Только метаданные
Comment on "certain clarifications on the resistive wall mode theorem and extensions" [Phys. Plasmas (2022) 29 (024502))
(2022) Pustovitov, V. D.; Пустовитов, Владимир Дмитриевич
Только метаданные
Theoretically assisted and empirical scalings in the problem of determination of internal inductance in tokamaks
(2023) Pustovitov, V. D.; Пустовитов, Владимир Дмитриевич
Открытый доступ
Comment on "Resistive wall modes and related sideways forces in tokamak" [Phys. Plasmas 27, 012508 (2020)]
(2020) Pustovitov, V. D.; Пустовитов, Владимир Дмитриевич
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Только метаданные
Toroidal and poloidal vessel currents during asymmetrical disruptions on COMPASS
(2019) Matveeva, E.; Havlicek, J.; Havranek, A.; Yanovskiy, V.; Pustovitov, V.; Пустовитов, Владимир Дмитриевич