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Hot Spot Formation on different Tokamak Wall Materials
Author(s) -
Nedospasov A. V.,
Bezlyudny I. V.
Publication year - 1998
Publication title -
contributions to plasma physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.531
H-Index - 47
eISSN - 1521-3986
pISSN - 0863-1042
DOI - 10.1002/ctpp.2150380151
Subject(s) - beryllium , materials science , divertor , tungsten , tokamak , sublimation (psychology) , hot spot (computer programming) , plasma , graphite , thermodynamics , composite material , nuclear physics , metallurgy , physics , psychology , computer science , psychotherapist , operating system
The thermal contraction phenomenon and generation of ‘hot spots’ due to thermoemission were described in [1–3]. The paper consider non‐linear stages of heat contraction on the graphite, beryllium, tungsten and vanadium wall. It is shown that on the beryllium surface hot spot can't appear due to strong cooling by sublimation. For other materials the conditions of hot spot appearance due to local superheating of the wall have been calculated and their parameters were found: critical surface temperature, size of spots and their temperature profiles, heat fluxes from plasma to the spots. It have been calculated fluxes of sublimating materials from spots to the plasma. It is noticed that nominal temperature of the grafite divertor plate, accepted in ITER's project to being equal 1500°C, is lower then critical temperature of the development heat contraction due to thermoemission.