Review of recent experiments on the T-10 tokamak with all metal wall

Vershkov, V.A.; Sarychev, D. V.; Notkin, G.E.; Shelukhin, D. A.; Buldakov, Mikhail A.; Dnestrovskij, Yu. N.; Grashin, S.A.; Kirneva, N.; Krupin, V.A.; Klyuchnikov, L. A.; Melnikov, A. V.; Neudatchin, S V; Nurgaliev, M. R.; Pavlov, Yu.D.; Savrukhin, P. V.; Team, the TCV

doi:10.1088/1741-4326/aa6b0e

Cited by 29 publications

(29 citation statements)

References 44 publications

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“…Strong decrease of QC amplitude at HFS is surprising taking into account high level of LRC along the magnetic line. Such results may be explained by the diagnostic peculiarities due to measurements non-locality [16]. Proposed hypothesis could explain the observation of LRC correlations for the QC fluctuations at HFS only in regions with low magnetic shear.…”

Section: Quasi-coherent Fluctuationsmentioning

confidence: 82%

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3D structure of density fluctuations in the T-10 tokamak and new approach for current profile estimation

et al. 2019

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Previous investigations of small-scale density fluctuation by means of correlation reflectometry in T-10 tokamak revealed the existence of several density fluctuation types and strong radial and poloidal variation of their amplitudes and correlation properties. This paper is focused on the new measurements of the 3D spatial distributions of the amplitudes, the radial correlation lengths and the long range correlations along the field lines for the different turbulence types. The properties of the density fluctuations were systematically studied with the improved reflectometers, data analyzing and acquisition hardware. The density fluctuations were measured by heterodyne correlation reflectometry using ordinary mode. New T-10 antenna set have horn antennae arrays at four places distributed toroidally and poloidally over tokamak torus. The experiments confirmed previously found strong poloidal amplitude asymmetry of the broad band and the quasi-coherent oscillations and the uniform poloidal distribution of stochastic low frequency fluctuations. The presence of those turbulence types was also proved by the measurements of perturbation properties using heavy ion beam probe diagnostic. The radial correlation measurements were performed at four poloidal angles to understand the poloidal dependence of the radial correlation length for the different fluctuation types. The significant decrease of the radial correlation lengths towards the high magnetic field side was observed for quasi-coherent and stochastic low frequency turbulence types. The long range correlations along the field lines were measured by the reflectometers in two cross-section separated by 1/4 of the torus. The reflectometers have the same frequency thus provide reflection from the same magnetic surface. Reflection radii are chosen by the frequency variation of the launched wave from shot to shot in a series of reproducible discharges. The measurements were carried out at the low and the high magnetic field side with two currents and simultaneous reverse of the direction of the toroidal magnetic field and the plasma current. Resonance radii were also calculated using 3D tracing of the magnetic field line and demonstrate good agreement with experiments. These results allow to propose the new approach for the current profile measurements in tokamaks.

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Section: Quasi-coherent Fluctuationsmentioning

confidence: 82%

“…4b). Special model was developed with perturbation transformation along the field line and 2D full wave reflection modelling [16]. It proved strong decrease of QC amplitude and correlation length at HFS due to distortion of QC oscillation in the presence of magnetic shear.…”

Section: Quasi-coherent Fluctuationsmentioning

confidence: 99%

3D structure of density fluctuations in the T-10 tokamak and new approach for current profile estimation

et al. 2019

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“…The frequency range of 40–150 kHz belongs to the quasicoherent (QC) modes in T-10, the specific type of oscillations under intensive study with various diagnostics (Vershkov et al. 2015, 2017). In figure 4, we compare line-outs of the cross-bicoherences and at , where statistically significant values are observed in (but not ).…”

Section: Analysis Of Wave–wave Cross-bicoherencementioning

confidence: 99%

Bispectral analysis of broadband turbulence and geodesic acoustic modes in the T-10 tokamak

et al. 2021

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Local fluctuations of electrostatic potential, poloidal electric field, magnetic potential and electron density are simultaneously measured in the T-10 tokamak by a heavy ion beam probe (HIBP) having a five-slit energy analyser, which allows an estimate of the turbulent particle flux and $\boldsymbol {E}\times \boldsymbol {B}$ rotation velocity in the off-minor-axis gradient zone of the toroidal plasma column. The high spatial and temporal resolution of the modern multichannel HIBP makes it an effective tool to study plasma oscillations. Motivated by previous work that has documented time-resolved interactions between measured plasma parameters using correlation analysis (coherence of $E_{\textrm {pol}}$ and density $n_e$ , and cross-phase), a new result from bicorrelation analysis (bicoherence of magnetic potential $A_\zeta$ and density $n_e$ , and biphase) is reported for documenting the evidence of wave–wave coupling and energy transfer associated with the interaction between geodesic acoustic modes (GAM) and broadband, quasi-coherent modes.

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“…В экспериментах на токамаке Т-10 [12,13] с вольфрамовыми диафрагмами (лимитерами) были зарегистрированы эффекты повышенных тепловых нагрузок на край полоидальной диафрагмы на внутреннем обводе при длительности такой нагрузки более 100 мс (т.е. в квазистационарных условиях) в серии из ~400 разрядов в экспериментальной кампании 2017 г.…”

Section: эксперименты с вольфрамовыми диафрагмами в токамаке т-10unclassified

“…в квазистационарных условиях) в серии из ~400 разрядов в экспериментальной кампании 2017 г. [4,12]. Экстремально большие нагрузки формировались в токамаке Т-10 в разрядах с СВЧ-нагревом плазмы, в которых большая часть теплового потока из плазменного шнура (около 100 кВт) фокусировалась на небольшой поверхности (площадью около 20 см 2 ) вольфрамовых пластин диафрагмы на внутреннем обводе, вызывая нагрев края этих пластин до высокой температуры.…”

Section: эксперименты с вольфрамовыми диафрагмами в токамаке т-10unclassified

Arcing Effects on Tokamak First Wall Tungsten Components Exposed to Plasma Loads

Budaev¹,

Khimchenko²,

Grashin³

et al. 2019

PAST-TF

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В статье приведены последние экспериментальные исследования вольфрамовых материалов после экстремальных плазменных нагрузок в токамаке Т-10. Плазменная нагрузка на поверхность вольфрамовых лимитеров приводит к эрозии и формированию неоднородной шероховатой поверхности. Условия в приповерхностной плазме над шероховатой поверхностью благоприятны для формирования дуг и искр, влияющих на перегрев поверхности материала. Влияние униполярных дуг и искр на взаимодействие плазмы с поверхностью может привести к усилению теплообмена плазмы с поверхностью и к охлаждению плазмы. Неамбиполярный поток из-за дуговых эффектов рекомендуется учитывать при оценке эрозии диверторных вольфрамовых пластин в ИТЭР. Ключевые слова: токамак, дивертор, плазменно-тепловые испытания материалов, материалы термоядерного реактора, вольфрам, дуги.

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Review of recent experiments on the T-10 tokamak with all metal wall

Cited by 29 publications

References 44 publications

3D structure of density fluctuations in the T-10 tokamak and new approach for current profile estimation

3D structure of density fluctuations in the T-10 tokamak and new approach for current profile estimation

Bispectral analysis of broadband turbulence and geodesic acoustic modes in the T-10 tokamak

Arcing Effects on Tokamak First Wall Tungsten Components Exposed to Plasma Loads

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