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Transport simulation of neutral-beam-heated ASDEX plasma in the L and H regimes
| Content Provider | Scilit |
|---|---|
| Author | Becker, G. Campbell, David Eberhagen, A. Gehre, O. Gernhardt, J. Lackner, K. Mayer, H. -M. Meisel, D. Murmann, H. Rapp, H. Stäbler, A. Wagner, F. Behringer, K. Fussmann, G. Gierke, G. Von Glock, E. Haas, G. Karger, F. Keilhacker, M. Klüber, O. Kornherr, M. Lisitano, G. Lister, G. G. Müller, E. R. Niedermeyer, H. Poschenrieder, W. Röhr, H. Schneider, F. Siller, G. Smeulders, P. Söldner, F. Speth, E. Steinmetz, K. Steuer, K. -H. Szymański, Z. Venus, G. Vollmer, O. |
| Copyright Year | 1983 |
| Description | Journal: Nuclear Fusion Local transport in the L (low $β_{p}$) and H (high $β_{p}$) types of double-null divertor discharges in ASDEX is investigated by computer modelling. For the L type, two subregimes with different local transport behaviour can be distinguished: Homogeneous electron heat diffusivities $χ_{e}$ =$ _{e}$ or flat $χ_{e}$ profiles and diffusion coefficients D = 0.2 $χ_{e}$ are found for$ _{e}$ < 5.2 x $10^{4}$ $cm^{2}s^{–1}$ (L-I), while above this limit, steep $χ_{e}$ and flat D profiles are determined (L-II). The observed decrease in energy confinement time with increasing neutral injection power is found to be due to enhancement of the electron heat diffusivity. In the L-II regime, $χ_{e}$ strongly increases with radius, while the diffusion coefficient remains flat. The diffusivities show a rather weak dependence on time as in the L-I regime. In both L regimes they rise with increasing injection power and decreasing plasma current, but are independent of density. In the H regime, transport is characterized by flat $χ_{e}$ profiles and D = 0.2 $χ_{e}$. The diffusivities are reduced by a factor of about two in the whole plasma compared with the L type. They show the variation with plasma current found in L discharges and are also independent of density. One more common feature of L and H regimes is that the ion heat diffusivity is in the range of 1 to 3 times the neoclassical values. |
| Related Links | http://iopscience.iop.org/article/10.1088/0029-5515/23/10/003/pdf |
| Ending Page | 1300 |
| Page Count | 8 |
| Starting Page | 1293 |
| ISSN | 00295515 |
| e-ISSN | 17414326 |
| DOI | 10.1088/0029-5515/23/10/003 |
| Journal | Nuclear Fusion |
| Issue Number | 10 |
| Volume Number | 23 |
| Language | English |
| Publisher | IOP Publishing |
| Publisher Date | 1983-10-01 |
| Access Restriction | Open |
| Subject Keyword | Journal: Nuclear Fusion Nuclear Energy and Engineering Transport Simulation Beam Heated Neutral Beam Asdex Plasma Heated Asdex |
| Content Type | Text |
| Resource Type | Article |
| Subject | Nuclear and High Energy Physics Condensed Matter Physics |
