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The role of the pedestal position on the pedestal performance has been investigated in AUG, JET-ILW and TCV. When the pedestal is peeling-ballooning (PB) limited, the three machines show a similar behaviour. The outward shift of the pedestal density relative to the pedestal temperature can lead to the outward shift of the pedestal pressure which, in turns, reduces the PB stability, degrades the pedestal confinement and reduces the pedestal width. Once the experimental density position is considered, the EPED model is able to correctly predict the pedestal height. An estimate of the impact of the density position on a ITER baseline scenario shows that the maximum reduction in the pedestal height is 10% while the reduction in the fusion power is between 10% and 40% depending on the assumptions for the core transport model used. In other plasmas, where the pedestal density is shifted even more outwards relative to the pedestal temperature, the pedestal does not seem PB limited and a different behaviour is observed. The outward shift of the density is still empirically correlated with the pedestal degradation but no change in the pressure position is observed and the PB model is not able to correctly predict the pedestal height. On the other hand, the outward shift of the density leads to a significant increase of eta(e) and eta(i) (where eta(e,i) is the ratio of density to temperature scale lengths, eta(e,i) = L-eta e,L-i/L-Te,L-i) which leads to the increase of the growth rate of microinstabilities (mainly ETG and ITG) by 50%. This suggests that, in these plasmas, the increase in the turbulent transport due to the outward shift of the density might play an important role in the decrease of the pedestal performance.
Role of the pedestal position on the pedestal performance in AUG, JET-ILW and TCV and implications for ITER
Frassinetti, L.;Dunne, M. G.;Sheikh, U.;Saarelma, S.;Roach, C. M.;Stefanikova, E.;Maggi, C.;Horvath, L.;Pamela, S.;de la Luna, E.;Wolfrum, E.;Bernert, M.;Blanchard, P.;Labit, B.;Merle, A.;Guimarais, L.;Coda, S.;Meyer, H.;Hillesheim, J. C.;Abduallev, S.;Abhangi, M.;Abreu, P.;Afzal, M.;Aggarwal, K. M.;Ahlgren, T.;Ahn, J. H.;Aho-Mantila, L.;Aiba, N.;Airila, M.;Albanese, R.;Aldred, V.;Alegre, D.;Alessi, E.;Aleynikov, P.;Alfier, A.;Alkseev, A.;Allinson, M.;Alper, B.;Alves, E.;Ambrosino, G.;Ambrosino, R.;Amicucci, L.;Amosov, V.;Sunden, E. Andersson;Angelone, M.;Anghel, M.;Angioni, C.;Appel, L.;Appelbee, C.;Arena, P.;Ariola, M.;Arnichand, H.;Arshad, S.;Ash, A.;Ashikawa, N.;Aslanyan, V.;Asunta, O.;Auriemma, F.;Austin, Y.;Avotina, L.;Axton, M. D.;Ayres, C.;Bacharis, M.;Baciero, A.;Baiao, D.;Bailey, S.;Baker, A.;Balboa, I.;Balden, M.;Balshaw, N.;Bament, R.;Banks, J. W.;Baranov, Y. F.;Barnard, M. A.;Barnes, D.;Barnes, M.;Barnsley, R.;Wiechec, A. Baron;Orte, L. 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2019
Abstract
The role of the pedestal position on the pedestal performance has been investigated in AUG, JET-ILW and TCV. When the pedestal is peeling-ballooning (PB) limited, the three machines show a similar behaviour. The outward shift of the pedestal density relative to the pedestal temperature can lead to the outward shift of the pedestal pressure which, in turns, reduces the PB stability, degrades the pedestal confinement and reduces the pedestal width. Once the experimental density position is considered, the EPED model is able to correctly predict the pedestal height. An estimate of the impact of the density position on a ITER baseline scenario shows that the maximum reduction in the pedestal height is 10% while the reduction in the fusion power is between 10% and 40% depending on the assumptions for the core transport model used. In other plasmas, where the pedestal density is shifted even more outwards relative to the pedestal temperature, the pedestal does not seem PB limited and a different behaviour is observed. The outward shift of the density is still empirically correlated with the pedestal degradation but no change in the pressure position is observed and the PB model is not able to correctly predict the pedestal height. On the other hand, the outward shift of the density leads to a significant increase of eta(e) and eta(i) (where eta(e,i) is the ratio of density to temperature scale lengths, eta(e,i) = L-eta e,L-i/L-Te,L-i) which leads to the increase of the growth rate of microinstabilities (mainly ETG and ITG) by 50%. This suggests that, in these plasmas, the increase in the turbulent transport due to the outward shift of the density might play an important role in the decrease of the pedestal performance.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11577/3357354
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simulazione ASN
Il report seguente simula gli indicatori relativi alla propria produzione scientifica in relazione alle soglie ASN 2023-2025 del proprio SC/SSD. Si ricorda che il superamento dei valori soglia (almeno 2 su 3) è requisito necessario ma non sufficiente al conseguimento dell'abilitazione. La simulazione si basa sui dati IRIS e sugli indicatori bibliometrici alla data indicata e non tiene conto di eventuali periodi di congedo obbligatorio, che in sede di domanda ASN danno diritto a incrementi percentuali dei valori. La simulazione può differire dall'esito di un’eventuale domanda ASN sia per errori di catalogazione e/o dati mancanti in IRIS, sia per la variabilità dei dati bibliometrici nel tempo. Si consideri che Anvur calcola i valori degli indicatori all'ultima data utile per la presentazione delle domande.
La presente simulazione è stata realizzata sulla base delle specifiche raccolte sul tavolo ER del Focus Group IRIS coordinato dall’Università di Modena e Reggio Emilia e delle regole riportate nel DM 589/2018 e allegata Tabella A. Cineca, l’Università di Modena e Reggio Emilia e il Focus Group IRIS non si assumono alcuna responsabilità in merito all’uso che il diretto interessato o terzi faranno della simulazione. Si specifica inoltre che la simulazione contiene calcoli effettuati con dati e algoritmi di pubblico dominio e deve quindi essere considerata come un mero ausilio al calcolo svolgibile manualmente o con strumenti equivalenti.