2D Deconvolution Using Adaptive Kernel

Nille, D.; Toussaint, U. von

doi:10.3390/proceedings2019033006

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…The orange line illustrates the line of sight (LOS) of the infrared (IR)-thermography [30] with focus on the outer divertor target. The IR-thermography measures the tile surface temperature, which is used as input for the implicit version [31] of THEODOR [32]. Applying the Eich-fit [33] allows to determine λ q and the divertor broadening S from the heat flux density profile.…”

Section: An Overview Of Non-calorimetric Diagnostics To Assess the Co...mentioning

confidence: 99%

An extensive analysis of SOL properties in high-δ plasmas in ASDEX Upgrade

Redl,

Eich,

Vianello

et al. 2024

Nucl. Fusion

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A set of dedicated discharges with constant heating power combining Neutral Beam Injection and Electron Cyclotron Resonance Heating have been executed at the ASDEX Upgrade tokamak using a high triangularity magnetic geometry in order to investigate the impact of filamentary transport to divertor and non-divertor components. The evolution of upstream scrape-off layer (SOL) profiles have been correlated with dedicated separatrix quantities, mostly with the turbulence control parameter αt [T. Eich and P. Manz: Nuclear Fusion 61, 086016 (2021)] describing the turbulence level at the separatrix. With increasing αt, a broadening of the upstream density profiles in the near-SOL together with the formation of a density shoulder in the far-SOL have been observed. This phenomenon is associated with an enhanced filamentary transport dominating the radial turbulent transport in the far-SOL and confirmed by means of the cooling water calorimetry on non-divertor components. The probe measurements conducted with the ball-pen probe-head mounted on the midplane manipulator and a retarding-field analyzer close to the limiter surface indicate that the key mechanism increasing the radial filamentary transport to the first wall is an increase of the particle flux Γr,fil, caused primarily by the packing fraction f PF,fil and the filament density n e,fil. At the same time, the electron temperature T e and ion temperature T i measured close to the limiter surface show only small fluctuations above αt > 0.5. Both the filamentary heat flux and the gross erosion derived from the first wall probe measurements reach a magnitude that should be considered in the design of future fusion reactors.

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Section: An Overview Of Non-calorimetric Diagnostics To Assess the Co...mentioning

confidence: 99%

An extensive analysis of SOL properties in high-δ plasmas in ASDEX Upgrade

Redl,

Eich,

Vianello

et al. 2024

Nucl. Fusion

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“…The filaments observed at the outer midplane ultimately reach the divertor target and are measured via the IR camera system installed at AUG [12]. IR cameras measure the divertor surface temperature, and from this, heat fluxes are inferred by using the implicit version [59] of the THEODOR code [12], which solves the heat diffusion equation within the divertor tile.…”

Section: Filament Toroidal Asymmetric Originmentioning

confidence: 99%

I-mode pedestal relaxation events at ASDEX Upgrade

Silvagni,

Eich,

Happel

et al. 2020

Preprint

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The I-mode confinement regime can feature small edge temperature drops that can lead to an increase in the energy deposited onto the divertor targets. In this work, we show that these events are associated with a relaxation of both electron temperature and density edge profiles, with the largest drop found at the pedestal top position. Stability analysis of edge profiles reveals that the operational points are far from the ideal peeling-ballooning boundary. Also, we show that these events appear close to the H-mode transition in the typical I-mode operational space in ASDEX Upgrade, and that no further enhancement of energy confinement is found when they occur. Moreover, scrape-off layer transport during these events is found to be very similar to type-I ELMs, with regard to timescales (≈ 800 µs), filament propagation, toroidally asymmetric energy effluxes at the midplane and asymmetry between inner and outer divertor deposited energy. In particular, the latter reveals that more energy reaches the outer divertor target. Lastly, first measurements of the divertor peak energy fluence are reported, and projections to ARC -a reactor designed to operate in I-mode -are drawn.

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2D Deconvolution Using Adaptive Kernel

Cited by 2 publications

References 15 publications

An extensive analysis of SOL properties in high-δ plasmas in ASDEX Upgrade

An extensive analysis of SOL properties in high-δ plasmas in ASDEX Upgrade

I-mode pedestal relaxation events at ASDEX Upgrade

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