Electron pressure balance in the SOL through the transition to detachment
| Autor: | Vlad Soukhanovskii, S.L. Allen, D. N. Hill, J.G. Watkins, Ezekial A Unterberg, B.D. Bray, C. Liu, P.C. Stangeby, T.H. Osborne, J.A. Boedo, A.W. Leonard, David Eldon, Adam McLean, M.E. Fenstermacher, M A Makowski, T.W. Petrie, M. Groth, C.K. Tsui, A.R. Briesemeister, C.J. Lasnier, T.N. Carlstrom |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2015 |
| Předmět: |
Nuclear and High Energy Physics
Tokamak ta214 Convective heat transfer ta114 Thomson scattering Chemistry Divertor ta221 Plasma Electron Mechanics law.invention Core (optical fiber) Materials Science(all) Nuclear Energy and Engineering law Pressure balance General Materials Science Atomic physics tokamaks ta218 |
| Zdroj: | JOURNAL OF NUCLEAR MATERIALS. 463:533-536 |
| ISSN: | 0022-3115 |
| Popis: | Upgrades to core and divertor Thomson scattering (DTS) diagnostics at DIII-D have provided measurements of electron pressure profiles in the lower divertor from attached- to fully-detached divertor plasma conditions. Detailed, multistep sequences of discharges with increasing line-averaged density were run at several levels of Pinj. Strike point sweeping allowed 2D divertor characterization using DTS optimized to measure Te down to 0.5 eV. The ionization front at the onset of detachment is found to move upwards in a controlled manner consistent with the indication that scrape-off layer parallel power flux is converted from conducted to convective heat transport. Measurements of ne, Te and pe in the divertor versus Lparallel demonstrate a rapid transition from Te ⩾ 15 eV to ⩽3 eV occurring both at the outer strike point and upstream of the X-point. These observations provide a strong benchmark for ongoing modeling of divertor detachment for existing and future tokamak devices. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect