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Integrated Modelling of Core and Divertor Plasmas for Demo-fns Hybrid Facility
| Content Provider | Semantic Scholar |
|---|---|
| Author | Dnestrovskiy, Alexey Yu. |
| Copyright Year | 2018 |
| Abstract | The steady state regime for tokamak based DEMO Fusion Neutron Source (DEMO-FNS) with parameters R/a=3.2 m/1m, B=5Т, Ipl=4-5 MA, PNBI=30MW and РECR=6МW is studied using a consistent modeling of the central and divertor plasma. In our formulation, the divertor plasma state is determined by the values of heat flux PSOL, the pressure of the neutrals pn and the neon content in NNe the divertor region. As boundary conditions for the central plasma we use values of density and temperatures of ions and electrons on the separatrix, the neon impurity relative density at the separatrix and the neutral flux through the separatrix toward to the central plasma column. In the divertor region all values calculated by the code SOLPS4.3 for a set of operating points (~150 in our case) with different values of PSOL, pn and NNe, and then the calculation results are approximated by analytical formulas. Heat transport in the central plasma is calculated using the ASTRA code and sets the scaling for the confinement time of energy IPB(y,2) with variation of H-factor. The simplified physical model for the description of the pedestal in H-mode inside the separatrix is used, based on the scalings for width and pressure at the pedestal. The hydrogen (deuterium and tritium) density is modelled taking into account sources of neutrals coming from divertor region, as well as the injection of fast atoms and/or pellet injection. The neon density and radiation in the main plasma is calculated using the STRAHL code. The Helium plasma dilution is taken into account in the main plasma to estimate the maximum permissible helium confinement values. The simulation determines the operational regime of DEMO-FNS, in which the heat load on divertor plates remain at an acceptable level, and the divertor plasma does not go into “detachment” mode and double-null separatrix configuration is kept to be symmetric. The dependence of these conditions on the impurity level is investigated. |
| File Format | PDF HTM / HTML |
| Alternate Webpage(s) | https://conferences.iaea.org/indico/event/151/papers/6175/files/4633-preprint8p_Dnestr_FEC18_plain_text.pdf |
| Language | English |
| Access Restriction | Open |
| Content Type | Text |
| Resource Type | Article |
