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

Abstract

In this paper, 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. Finally, 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.

Authors:
 [1];  [1];  [2];  [1];  [1];  [1];  [1]; ORCiD logo [1];  [3];  [1];  [2];  [2];  [2];  [2];  [2];  [4];  [5];  [1]
  1. Chinese Academy of Sciences (CAS), Hefei (China). Inst. of Plasma Physics
  2. Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
  3. Hunan Univ., Changsha (China). Dept. of Applied Physics
  4. General Atomics, San Diego, CA (United States)
  5. Johns Hopkins Univ., Baltimore, MD (United States)
Publication Date:
Research Org.:
Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States); Chinese Academy of Sciences (CAS), Hefei (China)
Sponsoring Org.:
USDOE; National Key Research and Development Program of China; National Natural Science Foundation of China (NNSFC); National Magnetic Confinement Fusion Science Program of China
OSTI Identifier:
1437606
Grant/Contract Number:  
AC02-09CH11466; 2017YFA0402500; 11775261; 11625524; 11605246; 11075185; 11021565; 2013GB114004
Resource Type:
Accepted Manuscript
Journal Name:
Review of Scientific Instruments
Additional Journal Information:
Journal Volume: 88; Journal Issue: 12; Journal ID: ISSN 0034-6748
Publisher:
American Institute of Physics (AIP)
Country of Publication:
United States
Language:
English
Subject:
70 PLASMA PHYSICS AND FUSION TECHNOLOGY

Citation Formats

Zuo, G. Z., Hu, J. S., Maingi, R., Yang, Q. X., Sun, Z., Huang, M., Chen, Y., Yuan, X. L., Meng, X. C., Xu, W., Gentile, C., Carpe, A., Diallo, A., Lunsford, R., Mansfield, D., Osborne, T., Tritz, K., and Li, J. G. Upgraded flowing liquid lithium limiter for improving Li coverage uniformity and erosion resistance in EAST device. United States: N. p., 2017. Web. doi:10.1063/1.4997806.
Zuo, G. Z., Hu, J. S., Maingi, R., Yang, Q. X., Sun, Z., Huang, M., Chen, Y., Yuan, X. L., Meng, X. C., Xu, W., Gentile, C., Carpe, A., Diallo, A., Lunsford, R., Mansfield, D., Osborne, T., Tritz, K., & Li, J. G. Upgraded flowing liquid lithium limiter for improving Li coverage uniformity and erosion resistance in EAST device. United States. doi:10.1063/1.4997806.
Zuo, G. Z., Hu, J. S., Maingi, R., Yang, Q. X., Sun, Z., Huang, M., Chen, Y., Yuan, X. L., Meng, X. C., Xu, W., Gentile, C., Carpe, A., Diallo, A., Lunsford, R., Mansfield, D., Osborne, T., Tritz, K., and Li, J. G. Thu . "Upgraded flowing liquid lithium limiter for improving Li coverage uniformity and erosion resistance in EAST device". United States. doi:10.1063/1.4997806. https://www.osti.gov/servlets/purl/1437606.
@article{osti_1437606,
title = {Upgraded flowing liquid lithium limiter for improving Li coverage uniformity and erosion resistance in EAST device},
author = {Zuo, G. Z. and Hu, J. S. and Maingi, R. and Yang, Q. X. and Sun, Z. and Huang, M. and Chen, Y. and Yuan, X. L. and Meng, X. C. and Xu, W. and Gentile, C. and Carpe, A. and Diallo, A. and Lunsford, R. and Mansfield, D. and Osborne, T. and Tritz, K. and Li, J. G.},
abstractNote = {In this paper, 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. Finally, 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.},
doi = {10.1063/1.4997806},
journal = {Review of Scientific Instruments},
number = 12,
volume = 88,
place = {United States},
year = {2017},
month = {12}
}

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Figures / Tables:

Fig.1 Fig.1: Distributor pictures: (a) distributor processing schematic drawings and (b) pictures of finished distributor.

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Works referenced in this record:

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    Figures/Tables have been extracted from DOE-funded journal article accepted manuscripts.