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Upgraded flowing liquid lithium limiter for improving Li coverage uniformity and erosion resistance in EAST device

Upgraded flowing liquid lithium limiter for improving Li coverage uniformity and erosion resistance in EAST device

Review of Scientific Instruments 88(12): 123506

ISSN/ISBN: 0034-6748

PMID: 29289198

DOI: 10.1063/1.4997806

We report on design and technology improvements for a flowing liquid lithium (FLiLi) limiter inserted into auxiliary heated discharges in the experimental advanced superconducting tokamak device. In order to enhance Li coverage uniformity and erosion resistance, a new liquid Li distributor with homogenous channels was implemented. In addition, two independent electromagnetic pumps and a new horizontal capillary structure contributed to an improvement in the observed Li flow uniformity (from 30% in the previous FLiLi design to >80% in this FLiLi design). To improve limiter surface erosion resistance, hot isostatic press technology was applied, which improved the thermal contact between thin stainless steel protective layers covering the Cu heat sink. The thickness of the stainless steel layer was increased from 0.1 mm to 0.5 mm, which also helped macroscopic erosion resilience. Despite the high auxiliary heating power up to 4.5 MW, no Li bursts were recorded from FLiLi, underscoring the improved performance of this new design.

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Accession: 065654089

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