The global energy balance of the ASDEX Upgrade tokamak determined with the revised cooling water calorimetry

Redl, A; Hohmann, T; Eich, T; Vianello, N; Bernert, M; David, P; den Harder, N; Herrmann, A; Rohde, V; Weiland, M; ,; ,

doi:10.1088/1361-6587/acfbb1

Cited by 3 publications

(7 citation statements)

References 36 publications

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“…As the upper divertor is not connected with the main plasma, the increase of energy loads is associated with an increase of cross-field transport [1]. The tomographic reconstructions and poloidal radiative heat load distributions of discharge #39231 in [35] indicate a strong localised radiation pattern between the upper X-point and the upper divertor plates.…”

Section: Evolution Of the Pfc Heat Loads At Dedicated Areasmentioning

confidence: 93%

“…Right: poloidal cross section of AUG indicating the coverage of the cooling units (colour highlighted areas and labels) available through the revised cooling water calorimetry. Each purple marker indicates one thermocouple providing an additional high-spatial poloidal coverage of the lower/upper divertor in single segments of AUG. Reproduced from [35]. © IOP Publishing Ltd. All rights reserved.…”

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

confidence: 99%

“…To measure the energy loads on all PCFs, two calorimetric diagnostics have recently become available [35,59] and are briefly introduced here. The cooling water calorimetry (KWK) exploits the extensive cooling system of the AUG tokamak, which encompasses the entire machine and provides an almost perfect coverage of all in-vessel components.…”

Section: Calorimetric Diagnostics Available At Augmentioning

confidence: 99%

“…This section represents an extension of the energy load scaling presented in [29]. The energy balance of the database introduced in the prervious chapter is based in the results summarized in [35] and have already been reported in [29]. Here, the first wall, the lower divertor (inner and outer divertor together), the upper divertor (inner and outer divertor together) and the heat shield are separately considered and discussed.…”

Section: Evolution Of the Pfc Heat Loads At Dedicated Areasmentioning

confidence: 99%

“…To determine amount of radiative energy reaching the upper divertor, the framework based on CHERAB and a Gaussian-Processes-Tomograpic model has been exploited. This framework is introduced in [35].…”

Section: Evolution Of the Pfc Heat Loads At Dedicated Areasmentioning

confidence: 99%

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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: Evolution Of the Pfc Heat Loads At Dedicated Areasmentioning

confidence: 93%

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

confidence: 99%

Section: Calorimetric Diagnostics Available At Augmentioning

confidence: 99%

Section: Evolution Of the Pfc Heat Loads At Dedicated Areasmentioning

confidence: 99%

Section: Evolution Of the Pfc Heat Loads At Dedicated Areasmentioning

confidence: 99%

See 3 more Smart Citations

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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Experimental investigation of steady state power balance in double null and single null H mode plasmas in MAST Upgrade

Lovell,

Henderson,

Stobbs

et al. 2024

Nuclear Materials and Energy

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Calorimetry measurement for energy balance and energy distribution in WEST for L-mode plasmas

Gaspar,

Gerardin,

Corre

et al. 2024

Nucl. Fusion

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The paper presents the energy balance of 602 pulses from four different experimental campaigns of the WEST tokamak. Different magnetic configuration has been studied with lower single null and upper single null configuration with deuterium or helium plasmas. The energy balance is closed with an imbalance of about 5% of the total injected energy for most of the campaigns and for the different magnetic configurations. The distribution over the whole machine is shown with the outer first wall receiving the most part of the energy due to its large surface area with about 30% of the total heat load, and the divertor with 25% due to the heat loads deposited by the convected power in the scrape off layer. Finally, the tomography inversion of the bolometry measurement allows to disentangle the contribution of the radiated and convected power in the energy absorbed by each type of PFC. Showing that in upper single null configuration about 63% of the available energy in the SOL is deposited in the upper divertor through convected heat loads, while in lower single null this value is spread over the lower divertor with 45% and the baffle and upper divertor with about 10% for both.

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The global energy balance of the ASDEX Upgrade tokamak determined with the revised cooling water calorimetry

Cited by 3 publications

References 36 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

Experimental investigation of steady state power balance in double null and single null H mode plasmas in MAST Upgrade

Calorimetry measurement for energy balance and energy distribution in WEST for L-mode plasmas

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