| Autor: |
E. Glock, O. Klüber, D. Zasche, E. Speth, M. Kaufmann, F. Wesner, J.-M. Noterdaeme, W. Poschenrieder, A. Eberhagen, H. Riedler, G. Fussmann, K. Steinmetz, K. McCormick, Z.A. Pietrzyk, G. Janeschitz, F. Ryter, J. Hofmann, G. Becker, H.M. Mayer, P. Smeulders, H. Niedermeyer, J. Gernhardt, K. Lackner, C. Setzensack, R.S. Lang, A. Izvozchikov, G. Haas, Asdex Team, G. Lisitano, H. Murmann, Hans-Stephan Bosch, G. Vlases, W. Sandmann, V. Mertens, S. Ugniewski, G.V. Gierke, K. Bühl, F. Leuterer, E.R. Müller, D. Eckhartt, J. Neuhauser, O. Vollmer, F. Karger, G. Siller, N. Tsois, F.X. Söldner, F. Schneider, H. Röhr, M. Lenoci, H. Rapp, M. Kornherr, F. Wagner, M. Keilhacker, D. Meisel, F. Mast, O. Gehre, H. Brocken, O. Gruber, K.-H. Steuer, J. Roth |
| Rok vydání: |
1987 |
| Předmět: |
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| Zdroj: |
Journal of Nuclear Materials. :215-219 |
| ISSN: |
0022-3115 |
| DOI: |
10.1016/0022-3115(87)90330-8 |
| Popis: |
Systematic investigations of the scrape-off layer (SOL) in the midplane of ASDEX have been carried out in He, D2 and H2 for diverted ohmic discharges over a wide range of plasma conditions: ne ∼ 0.5−4.7 × 1013 cm−3, Ip = 200–450 kA, BT = 16–23 kG, qa∼ 2.4–4.4 and POH = 200–480 kW. For the first two cm outside the separatix, ne is found to decay exponentially with an e-folding length λn given by λn = kqα (He, k = 1.32 cm, α = 0.52; D2, k =1.29 cm, α = 0.35; H2, k = 1.18 cm, α = 0.4) when from which follows for qa = 3: λn(D2) ∼ λn(H2) ∼ 0.8 λn(He). The qα scaling is roughly predicted by the simple formula λn = D⊥ Lυ∥ under the assumption D⊥ ∝ mi−0.5 (as has been observed on ASDEX for H2 and D2). There appears to be no explicit λn dependence on heating power. λn varies strongly with ne in the range ne ≤ 1 × 1013 cm−3, decreasing for example (D2,H2; qa = 3.0), from λn ≥ 3 cm at ne ∼ 0.5 × 1013 cm−3 to λn ∼ 1.9 cm for ne ≥ 1.5 × 1013 cm−3, ne at the separatrix is primarily a function of ne. |
| Databáze: |
OpenAIRE |
| Externí odkaz: |
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