PLASMA EDGE PHYSICS FOR NET-INTOR
The boundary plasma of NET/INTOR has been modelled using a two-dimensional fluid description of the plasma. The region modelled extends from the inner to the outer single-null divertor channels via the scrape-off plasma. It also includes a thin layer of plasma inboard of the separatrix. Transport of recycling neutral particles is treated in a simplified manner which neglects molecules but the results are in general accord with more detailed analyses based on a Monte Carlo treatment. The results show that the power flow to the divertor channels is asymmetric and that the peak power loading at the outer target (if the target is located normally to the magnetic surfaces) is about 20 MW/m**2. High recycling within the divertor reduces the peak electron temperature of the plasma sheath to 29 eV at the outer and 9 eV at the inner targets respectively. Sputtering of the tungsten target is very modest, about 10**Y1**9 atom/s. This corresponds to 9 mm/a erosion (for 100% availability and for a target located normally to the magnetic surfaces). Pumping of helium can be optimized by restricting the height of the pumping ducts to about 0.25 m. Some backflow of DT plasma from the throats of the high recycling divertor is predicted and this may degrade the exhaust of helium.
Bibliographic Reference: WRITE TO THE LIBRARIAN, UKAEA, CULHAM LABORATORY, ABINGDON, OXON, OX14 3DB (UK), MENTIONING REPORT CLM-P761, 1985
Record Number: 1989125011300 / Last updated on: 1987-01-01
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