Leonid Ruchko

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A frequency scanning O-mode reflectometer was used for studies of plasma density oscillations during local Alfvén wave (LAW) excitation in the Tokamak Chauffage Alfvén Brésilien (TCABR) at the frequency f(A) = 5 MHz. It was found that the spectrum of the reflectometer output signal, which consists mainly of the "beat" frequency f(B), is modified by the(More)
The software application described in this work aims to help with one of the main issues in experimental physics, the automation of data acquisition and equipment control. This software application, designated as SCTE, was written in Perl and uses the SCPI language to communicate with test instruments. The communication goes through RS-232 port, also known(More)
The preliminary design study of the Alfvén wave system for the ETE spherical tokamak is presented. The main objective of the proposed RF system is generation of travelling Alfvén waves, which can be used for the study of the non-inductive current drive and the plasma heating in a wide range of operational regimes, which are specific for tokamaks with small(More)
Local Alfvén wave (LAW) resonances are excited in tokamak plasmas by an externally driven electromagnetic field, with low frequency ωA =cAk|| <<ωci, where cA is the Alfvén velocity. Recently, wave driven density fluctuations at the LAW resonance m=± 1, N=±2 with few kW power deposition and 4 MHz frequency were detected in TCABR (Bt =1.1T, q0 =1.1,(More)
The design, construction, and characterization of an electron-cyclotron-resonance (ECR) plasma device and its utilization for growing AlN polycrystals are described in detail. The plasma density and electron temperature were measured by two types of Langmuir probes under different conditions of magnetic configuration and RF substrate polarization. For the(More)
This paper presents an overview of the results obtained during the Joint Experiments (JE) organized in the framework of the IAEA Coordinated Research Project (CRP) on “Joint Research Using Small Tokamaks” (JRUST) that have been carried out on the tokamaks CASTOR at IPP Prague, Czech Republic (2005), T-10 at RRC “Kurchatov Institute”, Moscow, Russia (2006)(More)
In tokamak machines with low toroidal magnetic fields and high plasma densities, the accessibility conditions impose restrictions to the detection of the Electron Cyclotron Emission ( ECE ). In these machines, the righthand cutoff condition can be used as an independent method to determine the local electron density from the ECE data in thermal discharges.(More)
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