Multidevice pedestal scaling experiments in the DIII-D, ASDEX Upgrade (AUG), and JET tokamaks are presented in order to test two plasma physics pedestal width models. The first model proposes a scaling of the pedestal width Δ/a ρ*1/2 to ρ* based on the radial extent of the pedestal being set by the point where the linear turbulence growth rate exceeds the E×B velocity. In the multidevice experiment where ρ* at the pedestal top was varied by a factor of four while other dimensionless parameters where kept fixed, it has been observed that the temperature pedestal width in real space coordinates scales with machine size, and that therefore the gyroradius scaling suggested by the model is not supported by the experiments. The density pedestal width is not invariant with ρ* which after comparison with a simple neutral fuelling model may be attributed to variations in the neutral fuelling patterns. The second model, EPED1, is based on kinetic ballooning modes setting the limit of the radial extent of the pedestal region and leads to Δψ βp1/2. All three devices show a scaling of the pedestal width in normalised poloidal flux as Δψ βp1/2, as described by the kinetic ballooning model; however, on JET and AUG, this could not be distinguished from an interpretation where the pedestal is fixed in real space. Pedestal data from all three devices have been compared with the predictive pedestal model EPED1 and the model produces pedestal height values that match the experimental data well.
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May 2011
Research Article|
May 31 2011
H-mode pedestal scaling in DIII-D, ASDEX Upgrade, and JET a)
M. N. A. Beurskens;
M. N. A. Beurskens
b)
1EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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T. H. Osborne;
T. H. Osborne
2General Atomics, P.O. Box 85608, San Diego, California 92186-5608,
USA
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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P. A. Schneider;
P. A. Schneider
3Association EURATOM-Max-Planck-Institut für Plasmaphysik, D-85748 Garching,
Germany
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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E. Wolfrum;
E. Wolfrum
3Association EURATOM-Max-Planck-Institut für Plasmaphysik, D-85748 Garching,
Germany
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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L. Frassinetti;
L. Frassinetti
4Association EURATOM-VR, Alfven Laboratory, School of Electrical Engineering, KTH, Stockholm,
Sweden
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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R. Groebner;
R. Groebner
2General Atomics, P.O. Box 85608, San Diego, California 92186-5608,
USA
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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P. Lomas;
P. Lomas
1EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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I. Nunes;
I. Nunes
5Centro de Fusao Nuclear, Associacao EURATOM-IST, Lisboa,
Portugal
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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S. Saarelma;
S. Saarelma
1EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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R. Scannell;
R. Scannell
1EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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P. B. Snyder;
P. B. Snyder
2General Atomics, P.O. Box 85608, San Diego, California 92186-5608,
USA
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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D. Zarzoso;
D. Zarzoso
6CEA, IRFM, F-13108 Saint Paul-lez-Durance,
France
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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I. Balboa;
I. Balboa
1EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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B. Bray;
B. Bray
2General Atomics, P.O. Box 85608, San Diego, California 92186-5608,
USA
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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M. Brix;
M. Brix
1EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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J. Flanagan;
J. Flanagan
1EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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C. Giroud;
C. Giroud
1EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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E. Giovannozzi;
E. Giovannozzi
7Associazione EURATOM-ENEA sulla Fusione, C.R. Frascati, Frascati,
Italy
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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M. Kempenaars;
M. Kempenaars
1EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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A. Loarte;
A. Loarte
8ITER Organization, CS 90 046, F-13067 Saint Paul lez Durance Cedex,
France
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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E. de la Luna;
E. de la Luna
9Associacion EURATOM-CIEMAT para Fusion, Madrid,
Spain
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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G. Maddison;
G. Maddison
1EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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C. F. Maggi;
C. F. Maggi
3Association EURATOM-Max-Planck-Institut für Plasmaphysik, D-85748 Garching,
Germany
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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D. McDonald;
D. McDonald
1EURATOM/CCFE Fusion Association, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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R. Pasqualotto;
R. Pasqualotto
10Associazione EURATOM-ENEA sulla Fusione, Consorzio RFX Padova,
Italy
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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G. Saibene;
G. Saibene
11FUSION FOR ENERGY Joint Undertaking, 08019 Barcelona,
Spain
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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R. Sartori;
R. Sartori
11FUSION FOR ENERGY Joint Undertaking, 08019 Barcelona,
Spain
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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Emilia R. Solano;
Emilia R. Solano
9Associacion EURATOM-CIEMAT para Fusion, Madrid,
Spain
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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M. Walsh;
M. Walsh
8ITER Organization, CS 90 046, F-13067 Saint Paul lez Durance Cedex,
France
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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L. Zabeo;
L. Zabeo
8ITER Organization, CS 90 046, F-13067 Saint Paul lez Durance Cedex,
France
JET-EFDA, Culham Science Centre, Abingdon OX14 3DB,
United Kingdom
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Phys. Plasmas 18, 056120 (2011)
Article history
Received:
December 01 2010
Accepted:
April 25 2011
Citation
M. N. A. Beurskens, T. H. Osborne, P. A. Schneider, E. Wolfrum, L. Frassinetti, R. Groebner, P. Lomas, I. Nunes, S. Saarelma, R. Scannell, P. B. Snyder, D. Zarzoso, I. Balboa, B. Bray, M. Brix, J. Flanagan, C. Giroud, E. Giovannozzi, M. Kempenaars, A. Loarte, E. de la Luna, G. Maddison, C. F. Maggi, D. McDonald, R. Pasqualotto, G. Saibene, R. Sartori, Emilia R. Solano, M. Walsh, L. Zabeo, The DIII-D Team, The ASDEX Upgrade Team, JET-EFDA Contributors; H-mode pedestal scaling in DIII-D, ASDEX Upgrade, and JET . Phys. Plasmas 1 May 2011; 18 (5): 056120. https://doi.org/10.1063/1.3593008
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