TITLE

Plasma density behavior with new graphite limiters in the Hefei Tokamak-7

AUTHOR(S)
Asif, M.; Gao, X.; Li, J.; Kuang, G. L.; Wan, B. N.; Jie, Y. X.; Zhao, J. Y.; Zhang, X. D.; Liu, H. Q.; Tong, X. D.; Liu, J.; Xu, Q.; Hu, J. S.; Yang, Y.; Shen, B.; Mao, J. S.; Hu, L. Q.; Wu, Z. W.; Ling, B. L.
PUB. DATE
August 2005
SOURCE
Physics of Plasmas;Aug2005, Vol. 12 Issue 8, p082502
SOURCE TYPE
Academic Journal
DOC. TYPE
Article
ABSTRACT
A new set of actively cooled toroidal double-ring graphite limiters has been developed in the Hefei Tokamak-7 (HT-7) [X. Gao et al., Phys. Plasmas 7, 2933 (2000)] for long pulse operation. The extension of operational region and density behavior with graphite (C) limiters have been studied in this paper. Extended high-density region at the high plasma current low-qa was obtained. The density profile with the C limiter was studied to compare with the previous molybdenum (Mo) limiter. The critical density of multifaceted asymmetric radiation from the edge (MARFE) onset is observed in the region of Zeff½fGW=0.9∼1.2, where fGW=ne/nGW. (Here ne is the maximum line average electron density and nGW is the Greenwald density.) Under the same injected power, the critical density of MARFE onset with the new C limiter is much higher than the previous Mo limiter.
ACCESSION #
18133419

 

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