Modernized active spectroscopic diagnostics (CXRS) of the T-10 tokamak

Krupin, V.A.; Klyuchnikov, L. A.; Korobov, K. V.; Nemets, A. R.; Nurgaliev, M. R.; Gorbunov, A. V.; Naumenko, N. N.; Troynov, V. I.; Tugarinov, S. N.; Fomin, F. V.

doi:10.1134/s1063778815100051

Cited by 8 publications

(7 citation statements)

References 5 publications

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“…Electron temperature profiles are measured by 24-channel ECE diagnostics [32], absolute values of the temperature at the centre are determined by a logarithmic slope of emission spectrum in the SXR region, measured by a semiconductor detector with an energy resolution of 200 eV [33]. Ion temperature profiles are measured using 9-channel active spectroscopy (CXRS diagnostics) [34,35] based on 30keV hydrogen diagnostic neutral beam DINA-6 (DNB). High etendue spectrometers developed for ITER are used for active spectroscopy at T-10.…”

Section: Methodsmentioning

confidence: 99%

Impurity transport in T-10 plasmas with ohmic heating

Krupin

Klyuchnikov

Nurgaliev

et al. 2018

Plasma Phys. Control. Fusion

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Impurity transport in the T-10 tokamak plasma with ohmic heating is studied in this paper. The values of various impurities densities, measured with the use of passive spectral diagnostics in the visible (Z eff ), active charge exchange measurements (He, C, O), and integral bolometric measurements with absolute extreme ultraviolet detectors (Fe, W) are shown. The experimental data show that accumulation level is growing with impurity nuclear charge and determined by the parameter1.5 , which is common for all sorts of impurities. Accumulation process is determined by neoclassical processes and begins with the increase of impurity content in the plasma and ends with the formation of density profiles more peaked than the n e (r). In discharges with low γ anomalous transport completely dominates. So it prevents the impurity accumulation and flattens their density profiles down to the n e (r). These observations correlates with measured negative (positive) plasma potential in discharges with high γ (low γ). 1D modelling using ASTRA and STRAHL transport codes is performed to describe the behaviour of impurities in a wide range of T-10 ohmic regimes. It is shown that the coefficients of anomalous transport D an and V an established in Krupin et al (1983 Sov. J. Plasma Phys. 9 529-36) and Krupin et al (1985 12th EPS Conf. on Plasma Physics) by describing the density dynamics of injected argon and potassium ions are applicable for the modelling of the He, C, O, W impurity density profiles and their sources. The analysis of the obtained results allows us to state the existence of a common dependence of the anomalous transport for all ions (impurities and deuterons) on the discharge parameters in the T-10 ohmic regimes.

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Section: Methodsmentioning

confidence: 99%

Impurity transport in T-10 plasmas with ohmic heating

Krupin

Klyuchnikov

Nurgaliev

et al. 2018

Plasma Phys. Control. Fusion

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“…This was partly due to the fact that the ion temperature measurements at the T-10 tokamak were performed irregularly, and it was difficult to feel the difference in temperature profiles. However, in recent years, it has been possible to establish systematic measurements of ion temperature profiles, and it has become possible to compare temperature profiles in different scenarios [5,6]. An analysis of the experimental data in the presented paper shows that the ion temperature profiles in ohmic discharges and with on-axis and mixed heating at the second harmonic of the EC resonance (ECR) are flatter than the electron temperature profiles.…”

Section: Introductionmentioning

confidence: 89%

“…Systematic measurements of ion temperature profiles at T-10 device in recent years [5,6] allow us to compare the profiles of electron and ion temperatures in shots with different parameters. The electron temperature profile was obtained from the second harmonic of EC emission measured by multichannel radiometer.…”

Section: Ohmic Shotsmentioning

confidence: 99%

Transport model of plasma heating at the second harmonic of the electron cyclotron frequency

Dnestrovskij

Данилов

Dnestrovskij

et al. 2021

Plasma Phys. Control. Fusion

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The optical thickness of the plasma is often insufficient to fully absorb the microwaves during heating at the second harmonic of the electron cyclotron frequency. An analysis of the experiments to the T-10 tokamak allows us to find the criteria for the full absorption, and to construct a canonical profile transport model for the full and partial absorptions of microwaves. The conditions to the equivalence of discharges in different tokamaks, and in a pair of tokamaks with the optimized W7-X stellarator are formulated. For equivalent discharges, calculations to the T-15MD tokamak under construction with the obtained model coincide with measurements of electron and ion temperatures in the W7-X over a wide range of plasma densities. The validated model is used to analyze future shots of T-15MD.

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“…The synthetic measurements are obtained by evaluating the synthetic signal from the C 5+ 5291 Å line spectrum using the method described in [6] and represent the measured plasma parameters. This calculation considers the simulation of a passive and a full signal.…”

Section: Jinst 15 C02027mentioning

confidence: 99%

The development of charge exchange recombination spectroscopy diagnostics for the T-15MD tokamak

et al. 2020

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In 2020 a modernized tokamak T-15MD (R = 1.5 m, a = 0.67 m, κ = 1.8, I pl ≤ 2 MA, B t ≤ 2 T, discharge duration ≤ 10 s, P aux ≤ 24 MW) will be launched in the National Research Center "Kurchatov Institute". For this installation, a modern Charge eXchange Recombination Spectroscopy (CXRS-diagnostics) has been developed. It can function both on a diagnostic injector (E D N B = 60 keV) and heating injector (E N BI = 80 keV). CXRS-diagnostics of T-15MD can be used to measure local values of the following plasma parameters with high spatial (≈ 1 cm) and temporal (≈ 1 ms) resolutions: ion temperature (T i ), density of main gas and light impurities nuclei (n z ), toroidal and poloidal rotation velocity (V pol , V tor ) and the fast-ion spectrum.The composition of the CXRS-diagnostic complex and its schematic is presented. Its main components are the DNB (H, 60 keV, 150 kW), four spectrometers (two of them based on Echelle gratings, one based on holographic grating and another utilizes both types of gratings), and EMCCDcameras. The attenuation of the diagnostic beam in the plasma is calculated considering its ionization and charge exchange by the main gas and impurities (C, O), as well as electron impact ionization. The intensities of active and passive components of λ = 5291 Å line of C 5+ ion are calculated considering the line fine structure, Doppler, and Zeeman effects.

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Modernized active spectroscopic diagnostics (CXRS) of the T-10 tokamak

Cited by 8 publications

References 5 publications

Impurity transport in T-10 plasmas with ohmic heating

Impurity transport in T-10 plasmas with ohmic heating

Transport model of plasma heating at the second harmonic of the electron cyclotron frequency

The development of charge exchange recombination spectroscopy diagnostics for the T-15MD tokamak

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