Cross-field particle transport in the edge plasma of tokamak TF-1

Budaev, V.P.; Богомолов, Л. М.; Borovsky, B.V.; Ivanov, R.S.; Lazarev, E.D.; Nedospasov, A. V.; Rakovets, A.A.; Sychev, V.N.; Trapeznikov, Yu. A.; Chernylevsky, A.V.

doi:10.1016/0022-3115(90)90130-f

Cited by 25 publications

(8 citation statements)

References 8 publications

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“…However, the diffusivity values remain quite a lot higher than the neo-classical values and seem also to be due to the fluctuation-induced transport at the high-field (inboard) side limiter location (ρ = −1) in the Aditya tokamak. Strong fluctuations and turbulence transport have been reported in the high-field (inboard) region of the TF-1 tokamak [36]. Fluctuation reduction by a factor of 10 compared with the low-field (outboard) side have been observed in the high-field (inboard) side of the Alcator C-Mod tokamak [37].…”

Section: Discussionmentioning

confidence: 93%

Investigation of oxygen impurity transport using the O⁴⁺visible spectral line in the Aditya tokamak

Chowdhuri¹,

Ghosh²,

Banerjee³

et al. 2013

Nucl. Fusion

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Intense visible lines from Be-like oxygen impurity are routinely observed in the Aditya tokamak. The spatial profile of brightness of a Be-like oxygen spectral line (2p3p 3D3–2p3d 3F4) at 650.024 nm is used to investigate oxygen impurity transport in typical discharges of the Aditya tokamak. A 1.0 m multi-track spectrometer (Czerny–Turner) capable of simultaneous measurements from eight lines of sight is used to obtain the radial profile of brightness of O4+ spectral emission. The emissivity profile of O4+ spectral emission is obtained from the spatial profile of brightness using an Abel-like matrix inversion. The oxygen transport coefficients are determined by reproducing the experimentally measured emissivity profiles of O4+, using a one-dimensional empirical impurity transport code, STRAHL. Much higher values of the diffusion coefficient compared with the neo-classical values are observed in both the high magnetic field edge region and the low magnetic field edge region of typical Aditya ohmic plasmas, which seems to be due to fluctuation-induced transport. The diffusion coefficient at the limiter radius in the low-field (outboard) region is typically ∼ twice as high as that at the limiter radius in the high-field (inboard) region.

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Section: Discussionmentioning

confidence: 93%

Investigation of oxygen impurity transport using the O⁴⁺visible spectral line in the Aditya tokamak

Chowdhuri¹,

Ghosh²,

Banerjee³

et al. 2013

Nucl. Fusion

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“…It is also observed in many diverted discharges that the measured fluctuation-induced flux is much too high to be consistent with global particle balance (DIII-D tokamak 23 , JET 36,22,26 ). Taken together, the above observations have led to the speculation that (3) there exists some inward particle transport mechanism that does not involve fine scale plasma turbulence such as large stationary convection cells, as suggested in some experiments [37][38][39][40] , and/or (4) there are large corrections that should be made to the fluctuation-induced flux estimate due to finite electron temperature fluctuations that are not being measured in many of these experiments, and/or (5) there exists a large poloidal asymmetry in the turbulent transport (ballooning hypothesis). However, with respect to speculation (4): Recent measurements in the Texas Experimental Tokamak-Upgrade (TEXT-U) 41 and in DIII-D 30 indicate that density and electron temperature fluctuations in the edge plasma tend to be in phase.…”

Section: Introductionmentioning

confidence: 83%

An interpretation of fluctuation induced transport derived from electrostatic probe measurements

LaBombard

2002

Physics of Plasmas

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Fluctuation-induced particle fluxes (Γ˜ñ φ) in the edge of Alcator C-Mod [Phys. Plasmas 1, 1511 (1994)] are inferred from a fast-scanning probe using standard analysis techniques. The magnitude and profile shape of Γ˜ñ φ is clearly inconsistent with fluxes inferred from global particle and power balance. These differences are difficult to reconcile if Γ˜ñ φ is interpreted as a measure of the particle flux in the unperturbed plasma. However, if Γ˜ñ φ is reinterpreted as the particle flux which must 'fill-in' the presheath zone formed by the probe, these inconsistencies are eliminated. In this case, an effective diffusivity in the presheath zone (D ps) can be estimated from Γ˜ñ φ. D ps is found to be in the range of diffusivities inferred from global particle balance (D SOL), indirectly supporting the hypothesis. However, the profile of D ps and its dependency on discharge conditions are markedly different than D SOL , implying that D ps is also not simply related to transport in the unperturbed plasma.

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“…Turbulence properties regarding magnetic structure and magnetic curvature were studied in tokamaks TF-2 (Budaev et al. 1990), T-10 (Kirnev et al. 2005), HYBTOK-II (Budaev et al.…”

Section: Experimental Datamentioning

confidence: 99%

“…to the typical low-frequency turbulence range (see Zweben et al 2007). Turbulence properties regarding magnetic structure and magnetic curvature were studied in tokamaks TF-2 (Budaev et al 1990), T-10 (Kirnev et al 2005), HYBTOK-II (Budaev et al 2003) and the Large Helical Device (Ohno et al 2006). Turbulent fluxes, fluctuation level and turbulent spectra were measured in these toroidal plasma discharges at outboard and inboard sides (which are of different magnetic curvature) of the torus to reveal any differences in the property regarding magnetic curvature.…”

Section: Measurements In Fusion Devicesmentioning

confidence: 99%

Generalized self-similarity of intermittent plasma turbulence in space and laboratory plasmas

2015

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Statistical characteristics of plasma fluctuations in the solar wind (SW), the Earth's magnetosphere and fusion devices are reviewed. The turbulence in all these media has a complicated multiscale structure and exhibits a generalized self-similarity in an extended scale range. The anomalous transport of mass and momentum is intermittent and is carried by sporadic plasma flux bursts with non-Gaussian statistics, long-range correlation and multifractality. Intermittent turbulent transport is characterized by superdiffusion with power law δx 2 ∝ τ α , α ≈ 1.2-1.8. The structure functions in all these plasma environments are well fitted by the log-Poisson model of turbulence. Intermittent plasma turbulence displays universal properties and consists of quasi-1-D singular dissipative structures.

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Cross-field particle transport in the edge plasma of tokamak TF-1

Cited by 25 publications

References 8 publications

Investigation of oxygen impurity transport using the O⁴⁺visible spectral line in the Aditya tokamak

Investigation of oxygen impurity transport using the O⁴⁺visible spectral line in the Aditya tokamak

An interpretation of fluctuation induced transport derived from electrostatic probe measurements

Generalized self-similarity of intermittent plasma turbulence in space and laboratory plasmas

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Cross-field particle transport in the edge plasma of tokamak TF-1

Cited by 25 publications

References 8 publications

Investigation of oxygen impurity transport using the O4+visible spectral line in the Aditya tokamak

Investigation of oxygen impurity transport using the O4+visible spectral line in the Aditya tokamak

An interpretation of fluctuation induced transport derived from electrostatic probe measurements

Generalized self-similarity of intermittent plasma turbulence in space and laboratory plasmas

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Product

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Investigation of oxygen impurity transport using the O⁴⁺visible spectral line in the Aditya tokamak

Investigation of oxygen impurity transport using the O⁴⁺visible spectral line in the Aditya tokamak