Helium exhaust in plasmas with strong radiative edge cooling

The compatibility of radiative edge cooling by neon injection and He exhaust with the pump limiter ALT-II is studied on TEXTOR. It is demonstrated that in plasmas with strong auxiliary heating (2 MW NBI) and with the highest average electron densities (¯ n e≈5.5×10 19 m −3) the effective confinement...

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Bibliographic Details
Published in:Journal of nuclear materials 1992-12, Vol.196, p.633-636
Main Authors: Samm, U., Boedo, J., Bertschinger, G., Dippel, K.H., Euringer, H., Finken, K.H., Gray, D., Hillis, D., Pospieszczyk, A., Reiter, D., Tokar, M., Unterberg, B.
Format: Article
Language:English
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Summary:The compatibility of radiative edge cooling by neon injection and He exhaust with the pump limiter ALT-II is studied on TEXTOR. It is demonstrated that in plasmas with strong auxiliary heating (2 MW NBI) and with the highest average electron densities (¯ n e≈5.5×10 19 m −3) the effective confinement time τ p * for He has a minimum. This good pumping performance is maintained even for cases in which up to 90% of the heating power is radiated from the plasma boundary (cold radiative edge). The processes inside the scoops of the pump limiter (neutral particle transport, re-ionization) and the variation of particle confinement in the main plasma dominate this behavior.
ISSN:0022-3115
1873-4820
DOI:10.1016/S0022-3115(06)80113-3