Estimation of the maximum divertor radiative fraction in the presence of a neutral cushionFunded under: FP3-FUSION 11C
Divertor impurity radiation may be used to reduce the target heat load in ITER-grade devices to acceptable values. The radiative power fraction in the divertor is in principle limited and, under standard high recycling conditions, too small to achieve this goal. This paper discusses the possible increase of the maximum radiative fractions by a neutral cushion that provides a pressure drop in the divertor by ion-neutral interaction. A pressure drop by a factor of about ten would allow the radiative fraction to increase sufficiently to satisfy constraints on ITER target loads. Supersonic flow conditions at the target are also included in the discussion, but are found to be insufficient, by themselves, to provide the required effect.
Bibliographic Reference: Report: JET-P(93)107 EN (1994) 8 pp.
Availability: Available from the Publications Officer, JET Joint Undertaking, Abingdon, Oxon. OX14 3EA (GB)
Record Number: 199410319 / Last updated on: 1994-11-28
Original language: en
Available languages: en