The quasi-continuous exhaust regime in ASDEX Upgrade and JET
The quasi-continuous exhaust (QCE) regime is a type-I ELM-free high confinement regime obtained at high plasma shaping and high separatrix density. A comparison with various ELM-free regimes in the literature is presented together with potential physics models for accessing the QCE regime. The regime was recently successfully ported from ASDEX Upgrade to JET. We present a first comparison between the achieved plasma conditions in the two tokamaks and an extrapolation towards ITER and EU-DEMO parameters. The step in size from ASDEX Upgrade to JET successfully lowered the pedestal top collisionality, demonstrating that the regime is not limited to high collisionality at the pedestal top but naturally operates at high density. The extrapolation to ITER and EU-DEMO parameters shows that they can reach the conditions in which ASDEX Upgrade and JET are operating in QCE without type-I ELMs applying previously proposed physics models. • The quasi-continuous exhaust (QCE) is a reactor-relevant regime without type-I ELMs. • Local ideal or resistive ballooning modes enhance transport at the pedestal foot. • Many reactor relevant pedestal top and foot conditions are met the experiments. • The proposed access conditions for QCE can be achieved in ITER and EU-DEMO.
Authors
- U. Stroth
- A. Kappatou (ORCID: https://orcid.org/0000-0003-3341-1909)
- S. Silburn
- A. Tookey (ORCID: https://orcid.org/0009-0009-6089-7634)
- E.R. Solano (ORCID: https://orcid.org/0000-0002-4815-3407)
- P. Böhm (ORCID: https://orcid.org/0000-0003-2590-4420)
- E. Wolfrum (ORCID: https://orcid.org/0000-0002-6645-6882)
- G. Harrer (ORCID: https://orcid.org/0000-0002-1150-3987)
- Michael P. Dunne (ORCID: https://orcid.org/0000-0001-7517-3860)
- M. Faitsch (ORCID: https://orcid.org/0000-0002-9809-7490)
- O. Sauter (ORCID: https://orcid.org/0000-0002-0099-6675)
- B. Labit (ORCID: https://orcid.org/0000-0002-0751-8182)
- I. Balboa
- P. Lomas
- L. Gil (ORCID: https://orcid.org/0000-0002-9970-2154)
- L. Radovanovic (ORCID: https://orcid.org/0000-0002-1311-0482)
- E. Viezzer (ORCID: https://orcid.org/0000-0001-6419-6848)
- D. Kos (ORCID: https://orcid.org/0000-0002-9550-4329)
- P. Bílková (ORCID: https://orcid.org/0000-0002-6156-9773)
- A. Redl (ORCID: https://orcid.org/0000-0002-7254-3501)
- E. Lerche
Institutions
- University of Lisbon (PT)
- TU Wien (AT)
- Czech Academy of Sciences, Institute of Plasma Physics (CZ)
- Max Planck Institute for Plasma Physics (DE)
- United Kingdom Atomic Energy Authority (GB)
- École Polytechnique Fédérale de Lausanne (CH)
- Universidad de Sevilla (ES)
Publication Details
- Journal
- Nuclear Materials and Energy
- Published
- 2025-02-24
- DOI
- https://doi.org/10.1016/j.nme.2025.101904
- Citations
- 3
- Primary Topic
- Magnetic confinement fusion research
- Type
- article
- Field-Weighted Citation Impact
- 5.61