The achievement of the Te,div feedback control by CD4 seeding on EAST

Wu, K.; Yuan, Q.; Xu, G.; Wang, L.; Eldon, D.; Li, K.; Liu, X.; Meng, L.; Zhang, L.; Wang, Y.; Duan, Y.; Chen, M.; Liu, J.; Luo, Z.; Calabrò, G.; Xiao, B.; Barr, J.; Guo, H.; Innocente, P.; Li, J.

doi:10.1088/1361-6587/ac1b20

Title: The achievement of the T_e,div feedback control by CD₄ seeding on EAST

Journal Article · Fri Aug 27 00:00:00 EDT 2021 · Plasma Physics and Controlled Fusion

DOI:https://doi.org/10.1088/1361-6587/ac1b20· OSTI ID:1829295

^[1]; Yuan, Q. ^[2];

^[2];

^[3];

^[4]; Liu, X. ^[2];

^[4]; Zhang, L. ^[2]; Wang, Y. ^[2]; Duan, Y. ^[2]; Chen, M. ^[2]; Liu, J. ^[2];

^[2]; Calabrò, G. ^[5]; Xiao, B. ^[2];

^[3]; Guo, H. ^[3];

^[6]; Li, J. ^[2]

Univ. degli studi della Tuscia, Viterbo (Italy); Chinese Academy of Sciences, Hefei (China)
Chinese Academy of Sciences, Hefei (China)
General Atomics, San Diego, CA (United States)
Chinese Academy of Sciences, Hefei (China); Univ. of Science and Technology in China, Hefei (China)
Univ. degli studi della Tuscia, Viterbo (Italy)
Consorzio RFX laboratory, Padova (Italy)

A multi-function divertor feedback control system has been built on Experimental Advanced Superconducting Tokamak (EAST) to treat the divertor heat load issue. With the real-time data of the Langmuir probes and the impurity seeding, the divertor electron temperature (T_e,div) is well controlled to achieve the partial detachment phase. The first trial of the CD₄ seeding for the T_e,div reduction has been achieved on EAST long-pulse discharge. In the seeding phase, the T_e,div was maintained close to 5 eV, and the surface temperature of the target plate (T_surface,div) had a reduction of about 150° C. The plasma stored energy had a reduction in the control phase, so it is necessary to find a way to keep the good plasma confinement in the next step. The CD₄ injection also mitigated the low hybrid wave coupling rate in some degree. The big volume of the CD₄ injection lifted the Greenwald density fraction from ~0.4 to ~0.7, which made the SOL into high recycling state. As a result, most of the injected carbon particles were in the high ionized state, and with the lower of the T_e,div, the tungsten line emission was suppressed obviously.

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Research Organization:: General Atomics, San Diego, CA (United States)

Sponsoring Organization:: USDOE Office of Science (SC), Fusion Energy Sciences (FES); National Nature Foundation of China

Grant/Contract Number:: SC0010685; 12075285; U1867222; 11922513; U19A20113

OSTI ID:: 1829295

Journal Information:: Plasma Physics and Controlled Fusion, Vol. 63, Issue 10; ISSN 0741-3335

Publisher:: IOP ScienceCopyright Statement

Country of Publication:: United States

Language:: English

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Title: The achievement of the Te,div feedback control by CD4 seeding on EAST

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Title: The achievement of the T_e,div feedback control by CD₄ seeding on EAST