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Optimization of the chamfering structures for ITER-like W/Cu monoblocks to avoid the leading edge-induced melting in EAST.
- Source :
-
Fusion Engineering & Design . Dec2020, Vol. 161, pN.PAG-N.PAG. 1p. - Publication Year :
- 2020
-
Abstract
- • Leading edge-induced melting of W/Cu monoblocks was found only at inter-CMs. • Thermal analysis identified the current dual chamfer shaping structure (1 mm × 1 mm) did not work as-intend at inter-CMs. • The symmetric CMs with different chamfer solutions at inter-CMs and intra-CM have been proposed to effectively improve the thermal performance of the upper W divertor in EAST. EAST has installed a full ITER-like W divertor with W/Cu monoblocks for targets in the upper part of vacuum chamber since 2014. Although the dual chamfer shaping structure with 1 mm cutting in both toroidal and radial directions (1 mm × 1 mm) has been employed to mitigate the leading edge-induced thermal effect, severe leading edge-induced melting was widely observed on both inner and outer targets. All melting only occurred at the leading edges between neighboring cassette modules (inter-CMs), while it was not found at the leading edges between neighboring monoblocks within one cassette module (intra-CM). To optimize the chamfering structure for avoiding melting, thermal analysis of W/Cu monoblocks was performed by finite element method. It is identified that the current dual chamfer shaping structure (1 mm × 1 mm) does not work for inter-CMs due to the large radial misalignment which was hardly controlled and could even reached up to 3 mm. With such large misalignment, the maximum surface steady state heat load is only 1.2 MW m−2 for current structure. Thus, a symmetric structure of CMs which survive EAST operations requirement with two different toroidal magnetic fields has been proposed to improve the thermal performance and avoid melting. At inter-CMs, the optimized chamfering structure suitable for larger misalignments and heat fluxes has been suggested. And, the current dual chamfer shaping structure is remained at intra-CM after thermal evaluation. Such symmetric CMs should ensure EAST operate with heat flux up to 3 MW m−2 with 3 mm misalignment level. And, further improvement to withstand a higher heat flux is also proposed and discussed. [ABSTRACT FROM AUTHOR]
Details
- Language :
- English
- ISSN :
- 09203796
- Volume :
- 161
- Database :
- Academic Search Index
- Journal :
- Fusion Engineering & Design
- Publication Type :
- Academic Journal
- Accession number :
- 147341606
- Full Text :
- https://doi.org/10.1016/j.fusengdes.2020.111951