Details

Autor(en) / Beteiligte

• Jaervinen, A.E.
• Allen, S.L.
• Groth, M.
• McLean, A.G.
• Rognlien, T.D.
• Samuell, C.M.
• Briesemeister, A.
• Fenstermacher, M.
• Hill, D.N.
• Leonard, A.W.
• Porter, G.D.

Titel

Interpretations of the impact of cross-field drifts on divertor flows in DIII-D with UEDGE

Ist Teil von

• Nuclear materials and energy, 2017-08, Vol.12 (C), p.1136-1140

Ort / Verlag

Netherlands: Elsevier Ltd

Erscheinungsjahr

2017

Quelle

Free E-Journal (出版社公開部分のみ）

Beschreibungen/Notizen

• •UEDGE simulations indicate that the toroidal C2+ flow velocities in the divertor plasmas are mainly entrained within 30% to the background deuterium flow in both L- and H-mode plasmas in the plasma region where the CIII 465 nm emission is measured.•The simulations indicate that in L-mode plasmas, the poloidal particle flows in the divertor are dominated by ionization driven flows, whereas radial particle fluxes are dominate ExB drifts.•The simulations indicate that in H-mode plasmas, both radial and poloidal particle flows in the steep gradient region next to the separatrix are dominated by ExB flows. Simulations using the multi-fluid code UEDGE indicates that, in low confinement (L-mode) plasmas in DIII-D, poloidal projection of the ionization driven flows dominate poloidal particle flows in the divertor near the divertor plates, whereas E ×B drift flows dominate the radial particle flows. In contrast, in high confinement (H-mode) conditions E ×B drift flows dominate both poloidal and radial particle flows in the divertor in the vicinity of the strong gradient region near the separatrix. UEDGE indicates that the toroidal C2+ flow velocities in the divertor plasmas are mainly entrained within 30% to the background deuterium flow in both L- and H-mode plasmas in the plasma region where the CIII 465nm emission is measured. Therefore, UEDGE indicates that the Doppler Coherence Imaging Spectroscopy (CIS), measuring the toroidal velocity of the C2+ ions, can provide insight to the deuterium flows in the divertor. Parallel-to-B velocity dominates the toroidal divertor flow; direct drift impact being less than 1%. Toroidal divertor flow is predicted to reverse when the magnetic field is reversed. This is explained by the parallel-B flow towards the nearest divertor plate corresponding to opposite toroidal directions in opposite toroidal field configurations.