Long-pulse discharges by synergy of LHW and IBW heating in the HT-7 tokamak

Gao, Xiang; Li, J.; Yang, Yilin; Xie, Jinbo; Luo, Junhua; Zhao, Jun; Gong, X.Z.; Hu, Liqun; Zhang, X.D.; Shi, Yuejiang; Wan, Baonian; Tanaka, K.; Sakamoto, R.; Zhao, Yanping; Guang-li, Kuang; Hu, Jiansheng; Asif, M.; Jie, Yu; Liu, H.Q.; Liu, J.; Xu, Qianfan; Gao, Li

doi:10.1016/j.jnucmat.2004.10.072

Cited by 18 publications

(18 citation statements)

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“…The Hefei Tokamak-7 (HT-7) is a superconducting tokamak [7][8][21][22][23][24][25][26], and it was reconstructed from the original Russian T-7 tokamak in 1994. It has a major radius of R = 1.22 m, minor radius of a = 0.27 m in the circular cross section.…”

Section: Methodsmentioning

confidence: 99%

“…The new GBST1308 doped graphite was used as limiter material. All carbon titles were coated with 100 µm Silicon Carbide (SiC) functional gradient coating [21]. The two poloidal water-cooling limiters and one toroidal water-cooling belt limiter at high field side were developed in 2002 [21].…”

Section: Methodsmentioning

confidence: 99%

“…All carbon titles were coated with 100 µm Silicon Carbide (SiC) functional gradient coating [21]. The two poloidal water-cooling limiters and one toroidal water-cooling belt limiter at high field side were developed in 2002 [21]. A new set of actively cooled toroidal double-ring graphite limiters [22], at bottom and top of the vacuum vessel was developed for long pulse operation, and up to 240 s of long pulse plasma has been achieved in the HT-7 in 2004 as shown in Fig.…”

Section: Methodsmentioning

confidence: 99%

“…In past operations with Mo limiter, due to energetic particles bombardment and overheating problem, the plasma discharge was usually terminated by the very strong hard Xray radiation, hot spot and high-Z impurities. In order to alleviate above problems, a new set of actively cooled toroidal double-ring graphite limiters [21], has been developed in the Hefei Tokamak-7 (HT-7) superconducting tokamak in 2004. The doped graphite GBST1308 with the dopant concentration of 1%B, 2.5%Si , 7.5%Ti, (about 20 % of first wall) was used as limiter material [21].…”

Section: Introductionmentioning

confidence: 99%

“…In order to alleviate above problems, a new set of actively cooled toroidal double-ring graphite limiters [21], has been developed in the Hefei Tokamak-7 (HT-7) superconducting tokamak in 2004. The doped graphite GBST1308 with the dopant concentration of 1%B, 2.5%Si , 7.5%Ti, (about 20 % of first wall) was used as limiter material [21]. Very stable and reproducible discharges were obtained with significantly increased density and a large increase in the available pulse length, as com- pared to Mo limiters.…”

Section: Introductionmentioning

confidence: 99%

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Study of confinement improvement in presence of a MARFE in the HT-7 superconducting tokamak

Asif¹

2006

Braz. J. Phys.

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A new set of actively cooled toroidal double-ring graphite limiters have been developed on the HT-7 tokamk for long pulse operation. In this paper, a Multifaceted asymmetric radiation from the edge (MARFE) phenomena and improved particle confinement induced by a MARFE, characterized by H α line emissions drops and the lineaveraged density increase have been studied in the HT-7 ohmic discharges (where the plasma current I p =145 kA, loop voltage V loop =2-3 V, toroidal field B T =1.7 T, and Z e f f =2-8). It is found that the improved particle confinement phase exists for about 90 ms and the particle confinement time τ P increased about 1.6 times.

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