A new MIG-3 gyrotron complex for creation and heating of plasma in the L-2M stellarator and the first experimental results

Batanov, G. M.; Belousov, V. I.; Bondar, Yu.F.; Borzosekov, V. D.; Vasilkov, D. G.; Grebenshchikov, S. E.; Ivannikov, I. A.; Колик, Л. В.; Konchekov, E. M.; Malakhov, D. V.; Matveev, N. V.; Meshcheryakov, A. I.; Petrov, A. E.; Sarksyan, K. A.; Скворцова, Н. Н.; Степахин, В. Д.; Kharchev, N. K.; Khol'nov, Yu.V.; Tai, E.M.

doi:10.1134/s1063780x1307012x

Cited by 19 publications

(7 citation statements)

References 7 publications

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“…The heating is carried out at the second harmonic of gyrotron radiation with the basic frequency of 75.3 GHz. Currently, this is the maximum energy input for such a heating method among all toroidal magnetic plasma confinement installations [2].…”

Section: Introductionmentioning

confidence: 99%

Modernization of the filtration system for the Doppler reflectometry diagnostics of the L-2M stellarator for operation in regimes high-power ECR heating

Kharchevskii¹,

Bogachev²,

Belukhov³

et al. 2020

J. Inst.

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The commissioning of the MIG-3 gyrotron complex at the L-2M stellarator has made it possible to reach a record power density input into plasma of 3.4 MW/m 3 during the ECR heating of the plasma. This power input, however, resulted in noisy Doppler reflectometry signals (with a high-amplitude component at the gyrotron working frequency of 75.3 GHz), which could not be processed and analyzed. We modernized the filtering system of the Doppler reflectometry diagnostics, which had consisted of two pin-type band stop waveguide filters. Another pin-type filter was added to the filter system and a new compact bandstop filter was designed based on the Fabry-Perot resonator (BFFPR) to provide high suppression at the frequency of 75.3 GHz and low attenuation at the 30-40 GHz diagnostic frequency. We optimized the cavity length of the filter and calculated the characteristics of filters with different numbers of resonators by using numerical simulations. The filter layout was designed, and its characteristics were measured. The results of experimental measurements and numerical simulations have a good match. The redesigned filters were used to suppress the noise from the MIG-3 gyrotron complex.

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Section: Introductionmentioning

confidence: 99%

Modernization of the filtration system for the Doppler reflectometry diagnostics of the L-2M stellarator for operation in regimes high-power ECR heating

Kharchevskii¹,

Bogachev²,

Belukhov³

et al. 2020

J. Inst.

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“…Recently we have shown that gyrotron discharge in mixtures of metal and dielectric powders can be used for synthesis of micro-and nanostructured materials. The synthetic approach was developed on a special stand incorporated into the standard design of the MIG-3 gyrotron complex [7]. The complex consists of two gyrotrons with a total power up to 1.5 MW.…”

Section: Introductionmentioning

confidence: 99%

Synthesis of oxide and nitride ceramics in high-power gyrotron discharge

Ахмадуллина

Скворцова

Obraztsova

et al. 2017

J. Phys.: Conf. Ser.

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Abstract. Synthesis of oxides, nitrides, and oxynitrides of silicon and aluminium by a pulsed microwave discharge in the mixtures of metal and dielectric powders is described. The microwave pulses were generated by high-power gyrotron (frequency 75 GHz, power up to 550 kW, pulse duration from 0.1 to 15ms). SiO 2 + β-Si 3 N 4 (1:1 by molar) and α-Al 2 O 3 + AlN (2:1 by molar) mixtures with Mg (1 and 5wt%) were treated in air with microwave pulses with power of 250÷400 kW and duration of 2÷8 ms. It was found that the discharge cannot be initiated for both mixtures in absence of Mg at any pulse power and duration. When 1% of Mg was added, the discharge was observed for both mixtures under 8 ms pulses of 400 kW; however, the amounts of materials produced were not enough for analysis. With 5% of Mg the discharge was observed for both mixtures under 8 ms pulses of 350 kW, and products of the plasma-chemical processes in the Al 2 O 3 + AlN mixture were analyzed.

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“…The powerful sources of microwave radiation (gyrotrons) used to heat the plasma [2] interfere with the detection of low-power diagnostic signals. To isolate such signals, it is necessary to provide high suppression at the ECR frequency of heating 75 GHz and to provide low attenuation at the diagnosis frequency of 30-40 GHz.…”

mentioning

confidence: 99%

Filters for diagnostic of Doppler reflectometry on the L-2M stellarator for operation under conditions of high ECR heating power

et al. 2017

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The study of the properties of edge plasma, in particular, the plasma rotation speed, in toroidal traps is associated with the search for ways to increase the efficiency and reliability of the thermonuclear reactor. One of the methods for measuring the rate of poloidal plasma rotation in tokamaks and stellarators is Doppler reflectometry (DR). The Doppler reflectometer is designed to work as part of the experimental L-2M device to measure the rates of its poloidal rotation, as well as to measure the spatialfrequency spectra of plasma density fluctuations [1].Diagnostics of high-temperature plasma in magnetic confinement systems is associated with a variety of problems and requires atypical engineering solutions. The powerful sources of microwave radiation (gyrotrons) used to heat the plasma [2] interfere with the detection of low-power diagnostic signals. To isolate such signals, it is necessary to provide high suppression at the ECR frequency of heating 75 GHz and to provide low attenuation at the diagnosis frequency of 30-40 GHz. The created system for filtering electromagnetic radiation consists of a band-stop filter based on a Fabry-Perot resonator and three, pin-shaped waveguide filters [3]. The CAD EMPro Keysight Technologies in a three-dimensional geometry of band-stop filter was represented as a few pairs of contiguous mica plates arranged successively at a distance from each other. Simulation of a microwave filter based on a Fabry-Perot resonator for microwave diagnostics of Doppler reflectometry, made it possible to construct an experimental filter sample with characteristics close to the given ones. The report presents the results of the development, modeling and experimental study of a filter based on a Fabry-Perot (FP) resonator. The introduction of the filter system made it possible to successfully carry out experimental measurements of the spectra of DR in the L-2M stellarator with an ECR heating power density of up to 3.4 MW/m 3 . The aim of the research was to create conditions for the stable operation of DR in conditions of powerful heating ECR radiation. To reduce the effect of an external signal with a frequency of 75.3 GHz and noise in the range 60-80 GHz, it was necessary to create a new filtering system. In the filtration system we used band-stop filters. The task of these filters is to provide large attenuation (suppression) in a certain frequency range Δf near the central frequency f 0 .The system of filters for diagnostics of DR consists of three pin-waveguide filters and filter based on FabryPerot resonator made of mica plates. In view of the design features of the diagnostics (in particular, the overall dimensions of the waveguide paths) the installation of additional pin filters, was not possible. It was required to design and manufacture a compact band-stop filter with a central suppression frequency of 75 GHz. A filter was proposed from the sequence of Fabry-Perot resonators. Millimeter and submillimeter filters based on the FabryPerot resonator are actively used in various diagnos...

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A new MIG-3 gyrotron complex for creation and heating of plasma in the L-2M stellarator and the first experimental results

Cited by 19 publications

References 7 publications

Modernization of the filtration system for the Doppler reflectometry diagnostics of the L-2M stellarator for operation in regimes high-power ECR heating

Modernization of the filtration system for the Doppler reflectometry diagnostics of the L-2M stellarator for operation in regimes high-power ECR heating

Synthesis of oxide and nitride ceramics in high-power gyrotron discharge

Filters for diagnostic of Doppler reflectometry on the L-2M stellarator for operation under conditions of high ECR heating power

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