Divertor and gas blanket impurity control study
A simple calculational model for the transport of particles across the scrap off region between the plasma and the wall in the presence of a divertor or a gas blanket has been developed. The model departs from previous work in including: (a) the entire impurity transport as well as its effect on the energy balance equations; (b) the recycling neutrals from the divertor, and (c) the reflected neutrals from the wall. Results obtained with this model show how the steady state impurity level in the plasma depends on the divertor parameters such as the neutral backflow from the divertor, the particle residence time and the scrape off thickness; and on the gas blanket parameters such as the neutral source strength and the gas blanket thickness. The variation of the divertor or gas blanket performance as a function of the heat and particle fluxes escaping from the plasma, the wall material and the cross field diffusion is examined and numerical examples are given.
- Research Organization:
- Georgia Inst. of Tech., Atlanta (USA). School of Nuclear Engineering
- Sponsoring Organization:
- USDOE
- DOE Contract Number:
- AS05-78ET52025
- OSTI ID:
- 6647312
- Report Number(s):
- DOE/ET/52025-8
- Country of Publication:
- United States
- Language:
- English
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