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Overview of progress in European medium sized tokamaks towards an integrated plasma-edge/wall solution
Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England..
Aristotle Univ Thessaloniki, Thessaloniki, Greece.;Max Planck Inst Plasma Phys, D-85748 Garching, Germany..
Aristotle Univ Thessaloniki, Thessaloniki, Greece.;Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England.;Teilinst Greifswald, Max Planck Inst Plasmaphys, D-17491 Greifswald, Germany..
Ecole Polytech Fed Lausanne, Swiss Plasma Ctr, CH-1015 Lausanne, Switzerland..
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2017 (English)In: Nuclear Fusion, ISSN 0029-5515, E-ISSN 1741-4326, Vol. 57, no 10, article id 102014Article in journal (Refereed) Published
Abstract [en]

Integrating the plasma core performance with an edge and scrape-off layer (SOL) that leads to tolerable heat and particle loads on the wall is a major challenge. The new European medium size tokamak task force (EU-MST) coordinates research on ASDEX Upgrade (AUG), MAST and TCV. This multi-machine approach within EU-MST, covering a wide parameter range, is instrumental to progress in the field, as ITER and DEMO core/pedestal and SOL parameters are not achievable simultaneously in present day devices. A two prong approach is adopted. On the one hand, scenarios with tolerable transient heat and particle loads, including active edge localised mode (ELM) control are developed. On the other hand, divertor solutions including advanced magnetic configurations are studied. Considerable progress has been made on both approaches, in particular in the fields of: ELM control with resonant magnetic perturbations (RMP), small ELM regimes, detachment onset and control, as well as filamentary scrape-off-layer transport. For example full ELM suppression has now been achieved on AUG at low collisionality with n = 2 RMP maintaining good confinement H-H(98,H-y2) approximate to 0.95. Advances have been made with respect to detachment onset and control. Studies in advanced divertor configurations (Snowflake, Super-X and X-point target divertor) shed new light on SOL physics. Cross field filamentary transport has been characterised in a wide parameter regime on AUG, MAST and TCV progressing the theoretical and experimental understanding crucial for predicting first wall loads in ITER and DEMO. Conditions in the SOL also play a crucial role for ELM stability and access to small ELM regimes.

Place, publisher, year, edition, pages
IOP PUBLISHING LTD , 2017. Vol. 57, no 10, article id 102014
Keyword [en]
edge localised modes, divertor, heat loads, ASDEX upgrade, MAST, TCV, alternative divertor concepts
National Category
Fusion, Plasma and Space Physics
Identifiers
URN: urn:nbn:se:uu:diva-329886DOI: 10.1088/1741-4326/aa6084ISI: 000404620600003OAI: oai:DiVA.org:uu-329886DiVA: diva2:1180813
Note

Group author: EUROfusion MST1 Team

Available from: 2018-02-06 Created: 2018-02-06 Last updated: 2018-02-06Bibliographically approved

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