| Autor: |
Stroth, U., Fuchert, G., Beurskens, M.N.A., Birkenmeier, G., Schneider, P.A., Scott, E.R., Brunner, K.J., Günzkofer, F., Hacker, P., Kardaun, O., Knauer, J.P., Rahbarnia, K., Zhang, D., team, MST1 |
| Předmět: |
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| Zdroj: |
Nuclear Fusion; Jan2021, Vol. 61 Issue 1, p1-9, 9p |
| Abstrakt: |
A confinement database with mainly electron-heated hydrogen plasmas from ASDEX Upgrade and Wendelstein 7-X was assembled. Stellarator confinement scaling expressions describe both standard discharges in the stellarator and L-mode plasmas in the tokamak similarly well and indicate a similar quality of energy confinement in both devices. While the energy confinement time in ASDEX Upgrade benefits from the smaller aspect ratio of the device, the transport coefficients in Wendelstein 7-X appear to be smaller possibly due to reduced average magnetic field curvature. A physics based confinement scaling is derived from a model that successfully describes transport in tokamaks. The dimensionally correct scaling has very similar parameter dependencies as the stellarator scalings and reproduces also the trends in the data from ITER L- and H-mode databases reasonably well. On the basis of this scaling, which represents the confinement times of the present data base, average tokamak L-mode and H-mode confinement is 7% lower and 76% higher, respectively. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
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