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50 results on '"Zuo, G.Z."'

33. A support vector machine framework for fault detection in molecular pump

Author

Yuan, X.L., Kai, J., Chen, Y., Zuo, G.Z., Zhuang, H.D., Li, J.H., and Hu, J.S.

Abstract

ABSTRACTThe molecular pump fault results in a vacuum leak that can lead to accidents in a fusion device. The fault detection for the molecular pump can provide an early warning to avoid a greater loss in a fusion device. This paper proposes a Support Vector Machine (SVM) framework for fault detection in a molecular pump. This study investigates the key technologies, framework, and system development methods of the data-driven fault detection system for a molecular pump. This study proposes a molecular pump test system to simulate the fault of a molecular pump to solve the highly unbalanced data problem and verify the framework availability. The packaged development framework, implemented in the test system, realizes the fault detection function. The developed system offers better practicability and can effectively detect perform faults in a molecular pump. The results obtained would support new ideas and methods for early warning in molecular pumps and pave the way for stable and reliable vacuum pump systems in a fusion device.

Published
2023
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34. Suppression of edge localized modes with real-time boron injection using the tungsten divertor in EAST

Author

Sun, Z., primary, Diallo, A., additional, Maingi, R., additional, Qian, Y.Z., additional, Tritz, K., additional, Wang, Y.F., additional, Wang, Y.M., additional, Bortolon, A., additional, Nagy, A., additional, Zhang, L., additional, Duan, Y.M., additional, Ye, Y., additional, Zhao, H.L., additional, Wang, H.Q., additional, Gu, X., additional, Zuo, G.Z., additional, Xu, W., additional, Huang, M., additional, Li, C.L., additional, Meng, X.C., additional, Zhou, C., additional, Liu, H.Q., additional, Zang, Q., additional, Wang, L., additional, Qian, J.P., additional, Xu, G.S., additional, Gong, X.Z., additional, Hu, J.S., additional, and team, EAST, additional

Published
2020
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36. Lithium splashing from flowing liquid lithium limiter and its effect on high confinement plasma performance in EAST tokamak

Author

Tang, Z.L., primary, Zuo, G.Z., additional, Li, C.L., additional, Maingi, R., additional, Meng, X.C., additional, Xu, W., additional, Sun, Z., additional, Qian, Y.Z., additional, Huang, M., additional, Zhang, D.H., additional, Andruczyk, D., additional, Tritz, K., additional, Yuan, X.L., additional, Zhang, X.B., additional, and Hu, J.S., additional

Published
2020
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37. Type-I ELM mitigation by continuous lithium granule gravitational injection into the upper tungsten divertor in EAST.

Author

Sun, Z., Qian, Y.Z., Maingi, R., Wang, Y.F., Wang, Y.M., Nagy, A., Tritz, K., Lunsford, R., Gilson, E., Zuo, G.Z., Xu, W., Huang, M., Meng, X.C., Mansfield, D.K., Zang, Q., Zhu, X., Lin, X., Liu, H.Q., Duan, Y.M., and Zhang, L.

Subjects
TUNGSTEN, TUNGSTEN alloys, FUSION reactors, DUST, PLASMA boundary layers, POWDERS
Abstract

Large edge-localized modes (ELMs) were mitigated by gravitational injection of lithium granules into the upper X-point region of the experimental advanced superconducting tokamak (EAST) device with tungsten plasma-facing components. The maximum ELM size was reduced by ∼70% in high βN H-mode plasmas. Large ELM stabilization was sustained for up to about 40 energy confinement times, with constant core radiated power and no evidence of high-Z or low-Z impurity accumulation. The lithium granules injection reduced the edge plasma pedestal density and temperature and their gradients, due to increased edge radiation and reduced recycling from the plasma-facing components. Ideal stability calculations using the ELITE code indicate that the stabilization of large ELMs correlates with improved stability of intermediate-n peeling-ballooning modes, due to reduced edge current resulting from the profile changes. The pedestal pressure reduction was partially offset by a core density increase, which resulted in a modest ∼7% drop in core stored energy and normalized energy confinement time. We surmise that the remnant small ELMs are triggered by the penetration of multiple Li granules just past the separatrix, similar to small ELMs triggered by deuterium pellet Futatani et al (2014 Nucl. Fusion 54 073008). This study extends previous ELM elimination with Li powder injection Maingi et al (2018 Nucl. Fusion 58 024003) in EAST because (1) use of small, dust-like powder and the related potential health hazards were eliminated, and (2) use of macroscopic granules should be more applicable to future devices, due to deeper penetration than dust particles, e.g. inside the separatrix with velocities ∼10 m s−1 in EAST. [ABSTRACT FROM AUTHOR]

Published
2021
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38. Advances in plasma–wall interaction control for H-mode operation over 100 s with ITER-like tungsten divertor on EAST

Author

Wang, L., primary, Guo, H.Y., additional, Ding, F., additional, Yu, Y.W., additional, Yuan, Q.P., additional, Xu, G.S., additional, Wang, H.Q., additional, Zhang, L., additional, Ding, R., additional, Xu, J.C., additional, Liu, J.B., additional, Zhang, B., additional, Wu, K., additional, Li, K.D., additional, Duan, Y.M., additional, Luo, Z.P., additional, Wu, J.H., additional, Zuo, G.Z., additional, Sun, Z., additional, Eldon, D., additional, Leonard, A.W., additional, Petrie, T., additional, Hyatt, A., additional, Humphreys, D., additional, Thomas, D., additional, Yang, Z.S., additional, Chen, X.H., additional, Feng, W., additional, Chen, L., additional, Meng, L.Y., additional, Qian, X.Y., additional, Liang, Y., additional, Sang, C.F., additional, Xiao, B.J., additional, Luo, G.-N., additional, Hu, J.S., additional, Maingi, R., additional, Zou, X.L., additional, Qian, J.P., additional, Gong, X.Z., additional, Garofalo, A.M., additional, Li, J., additional, and Wan, B.N., additional

Published
2019
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39. Real time wall conditioning with lithium powder injection in long pulse H-mode plasmas in EAST with tungsten divertor

Author

Sun, Z., primary, Maingi, R., additional, Hu, J.S., additional, Xu, W., additional, Zuo, G.Z., additional, Yu, Y.W., additional, Wu, C.R., additional, Huang, M., additional, Meng, X.C., additional, Zhang, L., additional, Wang, L., additional, Mao, S.T., additional, Ding, F., additional, Mansfield, D.K., additional, Canik, J., additional, Lunsford, R., additional, Bortolon, A., additional, and Gong, X.Z., additional

Published
2019
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40. Experiments of continuously and stably flowing lithium limiter in EAST towards a solution for the power exhaust of future fusion devices

Author

Hu, J.S., primary, Zuo, G.Z., additional, Maingi, R., additional, Sun, Z., additional, Tritz, K., additional, Xu, W., additional, Yang, Q.X., additional, Andruczyk, D., additional, Huang, M., additional, Meng, X.C., additional, Gong, X.Z., additional, Ruzic, D.N., additional, Ni, M.J., additional, Wan, B.N., additional, and Li, J.G., additional

Published
2019
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41. Corrosion characteristics of copper in static liquid lithium under high vacuum

Author

Meng, X.C., primary, Xu, C., additional, Zuo, G.Z., additional, Huang, M., additional, Tritz, K., additional, Andruczyk, D., additional, Sun, Z., additional, Xu, W., additional, Qian, Y.Z., additional, Huang, J.J., additional, Gao, X., additional, Yu, B., additional, Li, J.G., additional, Hu, J.S., additional, and Deng, Huiqiu, additional

Published
2019
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42. Suppression of edge localized modes with real-time boron injection using the tungsten divertor in EAST.

Author

Sun, Z., Diallo, A., Maingi, R., Qian, Y.Z., Tritz, K., Wang, Y.F., Wang, Y.M., Bortolon, A., Nagy, A., Zhang, L., Duan, Y.M., Ye, Y., Zhao, H.L., Wang, H.Q., Gu, X., Zuo, G.Z., Xu, W., Huang, M., Li, C.L., and Meng, X.C.

Subjects
DEUTERIUM, HARMONIC oscillators, DEUTERIUM ions, ELECTRON density, TUNGSTEN, TOROIDAL plasma
Abstract

We report an observation of robust suppression of edge-localized modes (ELMs) in the Experimental Advanced Superconducting Tokamak (EAST), enabled by continuous boron (B) powder injection. Edge harmonic oscillations appear during B powder injection, providing sufficient particle transport to maintain constant density and avoid impurity accumulation in ELM-stable plasmas. Quasi-steady ELM suppression discharges are demonstrated with modest energy confinement improvement and over a wide range of conditions: heating power and technique variation, electron density range over a factor ∼3.5, deuterium or helium ion species, and with either direction of the toroidal magnetic field. ELM suppression is observed above a threshold edge B intensity and ceases within 0.5 s of termination of the B injection. In contrast to ELM suppression accompanied by recycling reduction during Li powder injection in NSTX and EAST (Maingi et al 2018 Nucl. Fusion 58 024003), reduced recycling due to hydrogenic species retention is unnecessary for the ELM suppression with B powder injection, paving the way for its consideration as an ELM control tool for future fusion devices. [ABSTRACT FROM AUTHOR]

Published
2021
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44. First results of the use of a continuously flowing lithium limiter in high performance discharges in the EAST device

Author

Hu, J.S., primary, Zuo, G.Z., additional, Ren, J., additional, Yang, Q.X., additional, Chen, Z.X., additional, Xu, H., additional, Zakharov, L.E., additional, Maingi, R., additional, Gentile, C., additional, Meng, X.C., additional, Sun, Z., additional, Xu, W., additional, Chen, Y., additional, Fan, D., additional, Yan, N., additional, Duan, Y.M., additional, Yang, Z.D., additional, Zhao, H.L., additional, Song, Y.T., additional, Zhang, X.D., additional, Wan, B.N., additional, and Li, J.G., additional

Published
2016
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49. First observations of ELM triggering by injected lithium granules in EAST

Author

Mansfield, D.K., primary, Roquemore, A.L., additional, Carroll, T., additional, Sun, Z., additional, Hu, J.S., additional, Zhang, L., additional, Liang, Y.F., additional, Gong, X.Z., additional, Li, J.G., additional, Guo, H.Y., additional, Zuo, G.Z., additional, Parks, P., additional, Wu, W., additional, and Maingi, R., additional

Published
2013
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50. Corrosion characteristics of copper in static liquid lithium under high vacuum.

Author

Huang, J.J., Meng, X.C., Xu, W., Deng, Huiqiu, Yu, B., Xu, C., Zuo, G.Z., Huang, M., Sun, Z., Qian, Y.Z., Gao, X., Li, J.G., Hu, J.S., Tritz, K., and Andruczyk, D.

Subjects
*COPPER corrosion, *LITHIUM, *VACUUM, *ELECTRIC conductivity, *LIQUID metals
Abstract

Abstract Copper (Cu) materials are extensively used as heat sinks and sealing gaskets in fusion devices because they have the properties of good thermal and electrical conductivity and high plasticity. Meanwhile, liquid lithium (Li) is considered as a potential blanket coolant and tritium breeder and/or plasma facing material in fusion devices. Studying the corrosion characteristics of Cu materials by liquid Li under extreme fusion conditions is important because the corrosion of Cu by liquid Li may affect simultaneous application of these materials in fusion devices. The corrosion behavior of Cu in static liquid Li at 620 K for 15 h under high vacuum was investigated. After exposure to liquid Li, the weight loss rate of Cu in liquid Li is 466.1 g m−2 h−1, which is equivalent to 458.7 mm⋅a−1 for the average corrosion depth rate. The entire surface of each specimen was seriously damaged. Visible grain boundary corrosion was observed on the surface of the specimens. Also, Cu debris entered the liquid Li from the corroded surface, resulting in considerable Cu loss from the specimen. These results demonstrate a corrosion protection grade of Cu in liquid Li of 10, Cu cannot withstand the corrosion of liquid Li under the given conditions. Additionally, the corrosion process of Cu in liquid Li at 620 K under high vacuum was studied using the Large-scale Atomic/Molecular Massively Parallel Simulator (LAMMPS). The results from these simulations indicate that the corrosion of Cu in liquid Li is induced via physical dissolution and intergranular corrosion, where intergranular corrosion is the dominant mechanism. [ABSTRACT FROM AUTHOR]

Published
2019
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