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Titolo:
In-out asymmetry of divertor temperatures in tokamaks
Autore:
Wenzel, U; Coster, DP; Kallenbach, A; Kastelewicz, H; Laux, M; Maier, H; Schneider, R;
Indirizzi:
Max Planck Inst Plasma Phys, EURATOM Assoc, IPP, Berlin, Germany Max Planck Inst Plasma Phys Berlin Germany Assoc, IPP, Berlin, Germany EURATOM, Max Planck Inst Plasmaphys, IPP, Garching, Germany EURATOM Garching Germany Planck Inst Plasmaphys, IPP, Garching, Germany
Titolo Testata:
NUCLEAR FUSION
fascicolo: 11, volume: 41, anno: 2001,
pagine: 1695 - 1701
SICI:
0029-5515(200111)41:11<1695:IAODTI>2.0.ZU;2-4
Fonte:
ISI
Lingua:
ENG
Soggetto:
ASDEX-UPGRADE; DIII-D; PARALLEL; PLASMA; LAYER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
19
Recensione:
Indirizzi per estratti:
Indirizzo: Wenzel, U Max Planck Inst Plasma Phys, EURATOM Assoc, IPP, Berlin, GermanyMax Planck Inst Plasma Phys Berlin Germany P, Berlin, Germany
Citazione:
U. Wenzel et al., "In-out asymmetry of divertor temperatures in tokamaks", NUCL FUSION, 41(11), 2001, pp. 1695-1701

Abstract

A 2-D numerical simulation of the edge plasma in ASDEX Upgrade is used to show that above a critical density a bifurcation occurs, leading to strong poloidal in-out asymmetry of the electron temperature in the divertor. At densities well below and above the critical one, the asymmetry is less pronounced. Although drift terms are not included in the model, these findings can explain experimental observations from Alcator C-Mod and ASDEX Upgrade: (a) the clamping of the temperature in the inner divertor after the bifurcation and (b) the large temperature asymmetry immediately above the criticaldensity. The position of the colder divertor leg is determined by a small asymmetry which is amplified by the bifurcation. In the simulation the basic asymmetry is due to different lengths of the flux tubes in the plasma edge. In the experiment the asymmetry effect of different field line lengths is combined with the action of E x B drifts. Comparison of X point top and bottom measurements then produces evidence that the E x B drift effects are dominant. The effect of the difference in field line length is still present in the experiment but E x B produces a stronger effect.

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Documento generato il 05/04/20 alle ore 09:47:32