Sökning: onr:"swepub:oai:DiVA.org:kth-311934" >
Experimental study ...
Experimental study on the role of the target electron temperature as a key parameter linking recycling to plasma performance in JET-ILW*
-
- Lomanowski, B. (författare)
- Oak Ridge Natl Lab, POB 2009, Oak Ridge, TN 37831 USA.
-
- Dunne, M. (författare)
- Max Planck Inst Plasma Phys, Garching, Germany.
-
- Vianello, N. (författare)
- Univ Padua, Consorzio RFX, Acciaierie Venete SpA, Ist Nazl Fis Nucl,CNR ENEA, Corso Stati Uniti 4, I-35127 Padua, Italy.
-
visa fler...
-
- Aleiferis, S. (författare)
- NCSR Demokritos, Aghia Paraskevi 15310, Greece.
-
- Brix, M. (författare)
- Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England.
-
- Canik, J. (författare)
- Oak Ridge Natl Lab, POB 2009, Oak Ridge, TN 37831 USA.
-
- Carvalho, I. S. (författare)
- Univ Lisbon, Inst Plasmas & Fusao Nucl, Inst Super Tecn, Lisbon, Portugal.
-
- Frassinetti, Lorenzo (författare)
- KTH,Fusionsplasmafysik
-
- Frigione, D. (författare)
- ENEA CR Frascati, Unita Tecn Fus, Via E Fermi 45, I-00044 Rome, Italy.
-
- Garzotti, L. (författare)
- Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England.
-
- Groth, M. (författare)
- Aalto Univ, POB 14100, FIN-00076 Aalto, Finland.
-
- Meigs, A. (författare)
- Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England.
-
- Menmuir, S. (författare)
- Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England.
-
- Maslov, M. (författare)
- Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England.
-
- Pereira, T. (författare)
- Univ Lisbon, Inst Plasmas & Fusao Nucl, Inst Super Tecn, Lisbon, Portugal.
-
- von Thun, C. Perez (författare)
- Inst Plasma Phys & Laser Microfus IPPLM, Hery Str 23, PL-01497 Warsaw, Poland.
-
- Reinke, M. (författare)
- Oak Ridge Natl Lab, POB 2009, Oak Ridge, TN 37831 USA.
-
- Refy, D. (författare)
- Ctr Energy Res, Budapest, Hungary.
-
- Rimini, F. (författare)
- Culham Sci Ctr, CCFE, Abingdon OX14 3DB, Oxon, England.
-
- Rubino, G. (författare)
- Univ Tuscia, DEIM, Via Paradiso 47, I-01100 Viterbo, Italy.
-
- Schneider, P. A. (författare)
- Max Planck Inst Plasma Phys, Garching, Germany.
-
- Sergienko, G. (författare)
- Forschungszentrum Julich, Inst Energie & Klimaforsch, Plasmaphys, D-52425 Julich, Germany.
-
- Uccello, A. (författare)
- CNR, Inst Sci & Tecnol Plasmi, Via Cozzi 53, I-20125 Milan, Italy.
-
- Van Eester, D. (författare)
- Ecole Royale Mil Renaissancelaan, Koninklijke Mil Sch, Lab Plasma Phys, 30 Ave Renaissance, B-1000 Brussels, Belgium.
-
visa färre...
-
Oak Ridge Natl Lab, POB 2009, Oak Ridge, TN 37831 USA Max Planck Inst Plasma Phys, Garching, Germany. (creator_code:org_t)
- 2022-04-13
- 2022
- Engelska.
-
Ingår i: Nuclear Fusion. - : IOP Publishing. - 0029-5515 .- 1741-4326. ; 62:6
- Relaterad länk:
-
https://urn.kb.se/re...
-
visa fler...
-
https://doi.org/10.1...
-
visa färre...
Abstract
Ämnesord
Stäng
- Changes in global and edge plasma parameters (H (98(y,2)), dimensionless collisionality nu *, core density peaking, separatrix density n (e,sep)) with variations in the D-2 fueling rate and divertor configuration are unified into a single trend when mapped to ⟨T (e,ot)⟩, the spatially averaged spectroscopically derived outer target electron temperature. Dedicated JET with the ITER-like wall (JET-ILW) experiments in combination with an extended JET-ILW database of unseeded low-triangularity H-mode plasmas spanning a wide range of D-2 fueling rates, I (p), B (t) and heating power have demonstrated the importance of ⟨T (e,ot)⟩ as a key physics parameter linking the recycling particle source and detachment with plasma performance. The remarkably robust H (98(y,2)) trend with ⟨T (e,ot)⟩ is connected to a strong inverse correlation between ⟨T (e,ot)⟩, n (e,sep) and nu *, thus directly linking changes in the divertor recycling moderated by ⟨T (e,ot)⟩ with the previously established relationship between nu *, core density peaking and core pressure resulting in a degradation in core plasma performance with decreasing ⟨T (e,ot)⟩ (increasing nu *). A strong inverse correlation between the separatrix to pedestal density ratio, n (e,sep)/n (e,ped), and ⟨T (e,ot)⟩ is also established, with the rise in n (e,sep)/n (e,ped) saturating at ⟨T (e,ot)⟩ > 10 eV. A strong reduction in H (98(y,2)) is observed as ⟨T (e,ot)⟩ is driven from 30 to 10 eV via additional D-2 gas fueling, while the divertor remains attached. Consequently, the pronounced performance degradation in attached divertor conditions has implications for impurity seeding radiative divertor scenarios, in which H (98(y,2)) is already low (similar to 0.7) before impurities are injected into the plasma since moderate gas fueling rates are required to promote high divertor neutral pressure. A favorable pedestal pressure, p (e,ped), dependence on I (p) has also been observed, with an overall increase in p (e,ped) at I (p) = 3.4 MA as ⟨T (e,ot)⟩ is driven down from attached to high-recycling divertor conditions. In contrast, p (e,ped) is reduced with decreasing ⟨T (e,ot)⟩ in the lower I (p) branches. Further work is needed to (i) clarify the potential role of edge opacity on the observed favorable pedestal pressure I (p) scaling; as well as to (ii) project the global and edge plasma performance trends with ⟨T (e,ot)⟩ to reactor-scale devices to improve predictive capability of the coupling between recycling and confined plasma fueling in what are foreseen to be more opaque edge plasma conditions.
Ämnesord
- NATURVETENSKAP -- Fysik -- Fusion, plasma och rymdfysik (hsv//swe)
- NATURAL SCIENCES -- Physical Sciences -- Fusion, Plasma and Space Physics (hsv//eng)
Nyckelord
- recycling impact on plasma performance
- integration of tokamak exhaust and performance
- experimental plasma boundary physics
- plasma divertor spectroscopy
Publikations- och innehållstyp
- ref (ämneskategori)
- art (ämneskategori)
Hitta via bibliotek
Till lärosätets databas
- Av författaren/redakt...
-
Lomanowski, B.
-
Dunne, M.
-
Vianello, N.
-
Aleiferis, S.
-
Brix, M.
-
Canik, J.
-
visa fler...
-
Carvalho, I. S.
-
Frassinetti, Lor ...
-
Frigione, D.
-
Garzotti, L.
-
Groth, M.
-
Meigs, A.
-
Menmuir, S.
-
Maslov, M.
-
Pereira, T.
-
von Thun, C. Per ...
-
Reinke, M.
-
Refy, D.
-
Rimini, F.
-
Rubino, G.
-
Schneider, P. A.
-
Sergienko, G.
-
Uccello, A.
-
Van Eester, D.
-
visa färre...
- Om ämnet
-
- NATURVETENSKAP
-
NATURVETENSKAP
-
och Fysik
-
och Fusion plasma oc ...
- Artiklar i publikationen
-
Nuclear Fusion
- Av lärosätet
-
Kungliga Tekniska Högskolan