Which of the following would most likely account for the flattening of the density gradient? ✅ Tốt
Thủ Thuật về Which of the following would most likely account for the flattening of the density gradient? 2022
Lê Mạnh Hùng đang tìm kiếm từ khóa Which of the following would most likely account for the flattening of the density gradient? được Update vào lúc : 2022-09-22 13:30:24 . Với phương châm chia sẻ Mẹo về trong nội dung bài viết một cách Chi Tiết 2022. Nếu sau khi tham khảo tài liệu vẫn ko hiểu thì hoàn toàn có thể lại Comment ở cuối bài để Mình lý giải và hướng dẫn lại nha.Nội dung chính
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Highlights
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The formation of a density shoulder has been observed in inter-ELM H-mode plasmas.
•There is a link between shoulder formation and filament transition.
•Divertor collisionality remains the necessary condition for the shoulder formation.
•An additional condition has been found, related to deuterium fueling.
•Overall, the shoulder formation mechanism observed in L-mode remains valid.
Abstract
The term “shoulder formation” refers to an increase of the density decay length in the scrape-off layer (SOL) observed in many tokamaks during L-mode operation when a density threshold is reached. Recent experiments in ASDEX Upgrade (AUG) and JET have shown that the shoulder forms when the divertor collisionality in the divertor electrically disconnects filaments from the wall. This leads to a transition from the sheath limited to the inertial regime and to an enhancement of radial particle transport, in good agreement with analytical models. In the present work, the validity of such a mechanism is investigated in the more reactor-relevant H-mode regime. For this, a cold divertor H-mode scenario is developed in AUG using different levels of D puffing and N seeding, in which inter-ELM filaments and SOL density profiles are measured. The basic relation between filament size and divertor collisionality is still valid in H-mode plasmas, albeit an additional condition related to the gas fueling rate has been found for the formation of the shoulder.
PSI-20 keywords
ASDEX-Upgrade
Detachment
Edge plasma
Intermittent transport
H-mode
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© 2022 The Authors. Published by Elsevier Ltd.
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