2020
DOI: 10.1088/1741-4326/abbba0
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Developments towards an ELM-free pedestal radiative cooling scenario using noble gas seeding in ASDEX Upgrade

Abstract: Integrated edge-localized-mode (ELM)-free or small ELM scenarios for the demonstration fusion power plant (DEMO) are investigated in ASDEX Upgrade using argon seeding for radiative power removal mainly in the pedestal region. An important aspect is the modification of the electron pressure in the pedestal by the additional radiative power losses. Full ELM suppression could be achieved in a no-ELM H-mode scenario featuring an edge electromagnetic quasicoherent mode up to a heating power of 5 MW, where argon rad… Show more

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Cited by 39 publications
(65 citation statements)
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“…At the pedestal top, the higher puff level leads to a modest increase of n e from 5.8×10 19 m −3 to 6.8×10 19 m −3 and a decrease of T e from 600 eV to 500 eV. However, the densities of both neon stages are a factor of 2.1 lower when increasing the D puff level, which is partly due to an increase of the effective pumping speed with higher divertor density [14] and partly due to an increase of the ELM frequency from 150 Hz to 310 Hz, which reduces the time averaged inward pinch in the ETB [15,16]. Actually, the fits (including the CX-reactions) deliver for the inward pinch in the pedestal a reduction of the peak from v/D=-67 ṁ−1 to v/D=-46 ṁ−1 .…”
Section: Modelling Of the Ionisation Balance Of Neonmentioning
confidence: 94%
“…At the pedestal top, the higher puff level leads to a modest increase of n e from 5.8×10 19 m −3 to 6.8×10 19 m −3 and a decrease of T e from 600 eV to 500 eV. However, the densities of both neon stages are a factor of 2.1 lower when increasing the D puff level, which is partly due to an increase of the effective pumping speed with higher divertor density [14] and partly due to an increase of the ELM frequency from 150 Hz to 310 Hz, which reduces the time averaged inward pinch in the ETB [15,16]. Actually, the fits (including the CX-reactions) deliver for the inward pinch in the pedestal a reduction of the peak from v/D=-67 ṁ−1 to v/D=-46 ṁ−1 .…”
Section: Modelling Of the Ionisation Balance Of Neonmentioning
confidence: 94%
“…< ρ pol <0. 8. The authors do not claim that the combination of D and V shown here is the most optimized solution, other combinations might well improve the modeling.…”
Section: Experiments Description and Data Analysismentioning
confidence: 78%
“…Furthermore, argon seeding in EDA H-mode showed the compatibility of pedestal radiative cooling with no ELMs at high heating power (Kallenbach et al. 2021), including significant neutral beam injection (NBI).…”
Section: Introductionmentioning
confidence: 99%
“…The argon-seeded EDA H-mode in AUG discharge 36330 outlined in Kallenbach et al. (2021) includes NBI heating and, therefore, has the benefit of CXRS measurements. In addition, the study of argon gas puffing in this discharge is of particular relevance to future reactors which seek to mitigate excessive divertor heat loads even in the absence of ELMs (Kallenbach et al.…”
Section: Introductionmentioning
confidence: 99%
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