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

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.

doi:10.1088/1741-4326/abc763

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

Journal Article · Sun Dec 13 23:00:00 EST 2020 · Nuclear Fusion

DOI:https://doi.org/10.1088/1741-4326/abc763· OSTI ID:1818375

^[1]; ^[1]; Maingi, R. ^[1]; Qian, Y. Z. ^[2]; Tritz, K. ^[3]; ^[4]; Wang, Y. M. ^[4]; ^[1]; Nagy, A. ^[1]; Zhang, L. ^[4]; Duan, Y. M. ^[4]; Ye, Y. ^[5]; Zhao, H. L. ^[4]; Wang, H. Q. ^[6]; Gu, X. ^[4]; Zuo, G. Z. ^[4]; ^[5]; Huang, M. ^[4]; ^[2]; Meng, X. C. ^[7] more »

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)

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.

View Accepted Manuscript (DOE)

Research Organization:: Princeton Plasma Physics Laboratory (PPPL), Princeton, NJ (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: AC02-09CH11466; SC0016553; FC02-04ER54698

OSTI ID:: 1818375

Alternate ID(s):: OSTI ID: 23129555

Journal Information:: Nuclear Fusion, Journal Name: Nuclear Fusion Journal Issue: 1 Vol. 61; ISSN 0029-5515

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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