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research article

Analysis and expansion of the quasi-continuous exhaust (QCE) regime in ASDEX Upgrade

Faitsch, M.
•
Eich, T.
•
Harrer, G. F.
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July 1, 2023
Nuclear Fusion

The quasi-continuous exhaust (QCE) regime, formerly known as either type-II ELM or small ELM regime is studied in ASDEX Upgrade. The regime is a natural type-I ELM-free H-mode. The operational space of QCE discharges in ASDEX Upgrade with respect to their separatrix conditions and their power exhaust capabilities are presented. A significant broadening of the power fall-off length is observed, correlating to an increased separatrix density and pressure. Moreover, the possible reactor relevance of this regime is demonstrated by expanding the operational space to low edge safety factor and demonstrating the benign tungsten impurity behaviour. A discharge without any type-I ELM from start to end reaching a partially detached divertor at high normalised energy confinement time is presented.

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Type
research article
DOI
10.1088/1741-4326/acd464
Web of Science ID

WOS:000997917200001

Author(s)
Faitsch, M.
Eich, T.
Harrer, G. F.
Wolfrum, E.
Brida, D.
David, P.
Dunne, M.
Gil, L.
Labit, B.  
Stroth, U.
Date Issued

2023-07-01

Publisher

IOP Publishing Ltd

Published in
Nuclear Fusion
Volume

63

Issue

7

Article Number

076013

Subjects

Physics, Fluids & Plasmas

•

Physics

•

turbulence

•

separatrix

•

h-mode

•

magnetic confinement

•

qce

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confinement

•

tokamak

•

modes

•

jet

Editorial or Peer reviewed

REVIEWED

Written at

EPFL

EPFL units
SPC  
Available on Infoscience
June 19, 2023
Use this identifier to reference this record
https://infoscience.epfl.ch/handle/20.500.14299/198458
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