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Titolo: Inout 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:
 00295515(200111)41:11<1695:IAODTI>2.0.ZU;24
 Fonte:
 ISI
 Lingua:
 ENG
 Soggetto:
 ASDEXUPGRADE; DIIID; 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., "Inout asymmetry of divertor temperatures in tokamaks", NUCL FUSION, 41(11), 2001, pp. 16951701
Abstract
A 2D 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 inout 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 CMod 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