Transport Analysis of Low Density Discharges on JET

Energy and particle balance of plasma in discharges with low density on JET is investigated. Self-consistent transport analysis accounting bulk and edge plasma phenomena is carried out. It is shown that large difference between the ion edge temperature and the electron one could be the result of the influence of the secondary electron emission from the limiter in low density discharges.     

Tokamak DEMO-FNS: Concept of magnet system and vacuum chamber

The level of knowledge accumulated to date in the physics and technologies of controlled thermonuclear fusion (CTF) makes it possible to begin designing fusion—fission hybrid systems that would involve a fusion neutron source (FNS) and which would admit employment for the production of fissile materials and for the transmutation of spent nuclear fuel. Modern Russian strategies for CTF development plan the construction to 2023 of tokamak-based demonstration hybrid FNS for implementing steady-state plasma burning, testing hybrid blankets, and evolving nuclear technologies. Work on designing the DEMO-FNS facility is still in its infancy. The Efremov Institute began designing its magnet system and vacuum chamber, while the Kurchatov Institute developed plasma-physics design aspects and determined basic parameters of the facility. The major radius of the plasma in the DEMO-FNS facility is R = 2.75 m, while its minor radius is a = 1 m; the plasma elongation is k ₉₅ = 2. The fusion power is P _FUS = 40 MW. The toroidal magnetic field on the plasma-filament axis is B _t0 = 5 T. The plasma current is I _p = 5 MA. The application of superconductors in the magnet system permits drastically reducing the power consumed by its magnets but requires arranging a thick radiation shield between the plasma and magnet system. The central solenoid, toroidal-field coils, and poloidal-field coils are manufactured from, respectively, Nb₃Sn, NbTi and Nb₃Sn, and NbTi. The vacuum chamber is a double-wall vessel. The space between the walls manufactured from 316L austenitic steel is filled with an iron—water radiation shield (70% of stainless steel and 30% of water).     

Conditions of the Formation of a Shock Wave under Cavitation in Hydrocarbon Solutions

Doklady Physics - We carried out a numerical study of the appearance of a shock wave during the collapse of a bubble in a hydrocarbon aqueous solution. The conditions for the appearance of a shock...     

Development of heavy ion beam probe diagnostics

The results of the activity of the Kharkov and Moscow HIBP groups during recent years are presented in this paper. This is a review of papers published in the USSR and also contains extracts of some unpublished reports. The mathematical aspects of the diagnostics including the problems of the planning and design of an experiment along with the problems of the interpretation of the experimental data for plasma density and current determination are reviewed. The probing apparatus used in the experiment for plasma potential and density measurements are described. Some results of measurements are discussed and the trends to spread the use of HIBP in modern research are noted     

Simulation of Fuel Flows in Injection Systems of Demo-FNS Hybrid Facility Involving Coupled Modeling of the Core and Divertor Plasmas

Physics of Atomic Nuclei - The FC-FNS fuel cycle model is used to calculate the hydrogen isotope flows in the fuel systems of a tokamak-based fusion neutron source (DEMO-FNS) with parameters R/a =...     

Transport Models for Plasma Heating with Second Harmonic of Electron-Cyclotron Frequency

Physics of Atomic Nuclei - The optical thickness of plasma is often insufficient to absorb completely electromagnetic waves when heated at the second harmonic of the electron-cyclotron frequency....