Details

Autor(en) / Beteiligte

• Hillis, D.L.
• Hogan, J.T.
• Finken, K.H.
• West, W.P.
• Weynants, R.R.
• Wade, M.R.
• Akaishi, K.
• Baek, W.Y.
• Boedo, J.
• Burrell, K.H.
• Conn, R.W.
• Dippel, K.H.
• Doerner, R.
• Euringer, H.
• Finkenthal, D.
• Gray, D.S.
• Greenfield, C.M.
• Gohil, P.
• Groebner, R.J.
• Kim, J.
• Klepper, C.C.
• Messiaen, A.M.
• Mioduszewski, P.K.
• Miyahara, A.
• Moyer, R.
• Van Oost, G.
• Pospieszcyk, A.
• Reiter, D.
• Rusbüldt, D.
• Seraydarian, R.P.
• Van Nieuwenhove, R.
• Wolf, G.H.

Titel

Helium transport in enhanced confinement regimes on the TEXTOR and DIII-D tokamaks

Ist Teil von

• Journal of nuclear materials, 1992-12, Vol.196, p.35-44

Ort / Verlag

Elsevier B.V

Erscheinungsjahr

1992

Quelle

Elsevier Journal Backfiles on ScienceDirect (DFG Nationallizenzen)

Beschreibungen/Notizen

• Comparisons of helium (He) transport and exhaust in L-mode and in an enhanced confinement regime (H-mode), which is induced by a polarizing electrode, have been made for the TEXTOR tokamak. The results show an increased tendency for He accumulation when bulk plasma energy and particle confinement are improved during the polarization-induced H-mode. Since these results imply that a high He pumping efficency may be necessary for H-mode burning plasmas, we have begun exploring He transport in a divertor H-mode, similar to that proposed for the international thermonuclear experimental reactor (ITER). A collaborative program has been initiated to measure He transport and scaling on DIII-D during L-mode, H-mode, and ELMing H-mode plasma conditions. To simulate the presence of He ash in DIII-D, a 25 ms He puff is injected into a DIII-D plasma, resulting in a He concentration of ≈5%. The time dependence of the He 2+ density profiles in the plasma core is measured by charge-exchange recombination spectroscopy at 11 radial locations.