Recent Experiment Results during Electron Cyclotron Heating on HL-2A

Journal Article · Mon Apr 07 00:00:00 EDT 2008 · AIP Conference Proceedings

DOI:https://doi.org/10.1063/1.2917030· OSTI ID:21137039

Dong, Y B; Liu, Yi; Sun, H J; Zhou, Jun; Xiao, W W; Chen, W; Deng, W; Yao, L H; Feng, B B; Rao, J; Yang, Q W; Ding, X T; Liu, Yong; Pan, C H ^[1]

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1. Southwestern Institute of Physics (SWIP), P.O Box 432, Chengdu 610041 (China)

The recent experiment results during electron cyclotron resonance heating (ECRH) on HL-2A tokamak are presented in this paper. During ECRH with a series of the supersonic molecular beam injection (SMBI) pulse fueling, the plasma storage energy W{sub E}, {beta}{sub p}, line averaged density n{sub e} and 'fusion neutron' count increase, leading to the plasma confinement improved. Furthermore, the non-local transport phenomena induced by SMBI have been firstly observed in HL-2A tokamak. The non-local effect induced by SMBI in HL-2A lasts much longer than that induced by pellet injection in other similar size tokamak; both the bolometer radiation and the H{sub a} emission decrease when the non-local effect appears. It indicates that an electron transport barrier has possibly been formed at the position just outside the q = 1 surface during this phase. In addition, the delayed core soft x-ray intensity decrease has been observed after ECRH switch-off, while the edge soft X-ray intensity decreases just after the ECRH switch off. The study shows transport coefficient reduces at all radii just after the off-axis ECRH switch off, especially near the heating deposition location. Moreover, various types of sawteeth activities during ECRH experiment are investigated, and the relationship between the sawtooth period and the power deposition location has been studied.

• OSTI ID: 21137039
• Journal Information: AIP Conference Proceedings, Vol. 996, Issue 1; Conference: 17. IAEA technical meeting on research using small fusion devices, Lisbon (Portugal), 22-24 Oct 2007; Other Information: DOI: 10.1063/1.2917030; (c) 2008 American Institute of Physics; Country of input: International Atomic Energy Agency (IAEA); ISSN 0094-243X
• Country of Publication: United States
• Language: English

Related Subjects

70 PLASMA PHYSICS AND FUSION TECHNOLOGY
BEAM INJECTION
ECR HEATING
ELECTRON DENSITY
ELECTRONS
HL-2A TOKAMAK
MOLECULAR BEAMS
NEUTRONS
PELLET INJECTION
PLASMA
PLASMA CONFINEMENT
PLASMA DIAGNOSTICS
PLASMA INSTABILITY
PULSES
RADIATION TRANSPORT
RF SYSTEMS
SAWTOOTH OSCILLATIONS
SOFT X RADIATION
THERMONUCLEAR REACTORS