Suppression of edge localized modes with real-time boron injection using the tungsten divertor in EAST
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. Here, 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.
- Authors:
-
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- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Chinese Academy of Sciences, Anhui (China); Nanchang Univ. (China)
- Johns Hopkins Univ., Baltimore, MD (United States)
- Chinese Academy of Sciences, Anhui (China)
- Hefei Comprehensive National Science Center (China)
- General Atomics, San Diego, CA (United States)
- Hefei Comprehensive National Science Center (China)
- Univ. of Science and Technology of China, Anhui (China)
- Chinese Academy of Sciences, Anhui (China); Key Lab. of Photovoltaic and Energy Conservation Materials, Hefei (China)
- Publication Date:
- Research Org.:
- Princeton Plasma Physics Lab. (PPPL), Princeton, NJ (United States)
- Sponsoring Org.:
- USDOE
- OSTI Identifier:
- 1818375
- Grant/Contract Number:
- AC02-09CH11466; SC0016553; FC02-04ER54698
- Resource Type:
- Accepted Manuscript
- Journal Name:
- Nuclear Fusion
- Additional Journal Information:
- Journal Volume: 61; Journal Issue: 1; Journal ID: ISSN 0029-5515
- Publisher:
- IOP Science
- Country of Publication:
- United States
- Language:
- English
- Subject:
- 70 PLASMA PHYSICS AND FUSION TECHNOLOGY
Citation Formats
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., Meng, X. C., Zhou, C., Liu, H. Q., Zang, Q., Wang, L., Qian, J. P., Xu, G. S., Gong, X. Z., and Hu, J. S. Suppression of edge localized modes with real-time boron injection using the tungsten divertor in EAST. United States: N. p., 2020.
Web. doi:10.1088/1741-4326/abc763.
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., Meng, X. C., Zhou, C., Liu, H. Q., Zang, Q., Wang, L., Qian, J. P., Xu, G. S., Gong, X. Z., & Hu, J. S. Suppression of edge localized modes with real-time boron injection using the tungsten divertor in EAST. United States. https://doi.org/10.1088/1741-4326/abc763
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., Meng, X. C., Zhou, C., Liu, H. Q., Zang, Q., Wang, L., Qian, J. P., Xu, G. S., Gong, X. Z., and Hu, J. S. Mon .
"Suppression of edge localized modes with real-time boron injection using the tungsten divertor in EAST". United States. https://doi.org/10.1088/1741-4326/abc763. https://www.osti.gov/servlets/purl/1818375.
@article{osti_1818375,
title = {Suppression of edge localized modes with real-time boron injection using the tungsten divertor in EAST},
author = {Sun, Z. and Diallo, A. and Maingi, R. and Qian, Y. Z. and Tritz, K. and Wang, Y. F. and Wang, Y. M. and Bortolon, A. and Nagy, A. and Zhang, L. and Duan, Y. M. and Ye, Y. and Zhao, H. L. and Wang, H. Q. and Gu, X. and Zuo, G. Z. and Xu, W. and Huang, M. and Li, C. L. and Meng, X. C. and Zhou, C. and Liu, H. Q. and Zang, Q. and Wang, L. and Qian, J. P. and Xu, G. S. and Gong, X. Z. and Hu, J. S.},
abstractNote = {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. Here, 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.},
doi = {10.1088/1741-4326/abc763},
journal = {Nuclear Fusion},
number = 1,
volume = 61,
place = {United States},
year = {Mon Dec 14 00:00:00 EST 2020},
month = {Mon Dec 14 00:00:00 EST 2020}
}
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