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Overview of experimental results on HL-2A

Funded under: FP7-EURATOM


Significant experimental advances have been made on the HL-2A tokamak along with substantial improvement and development of the hardware. A spontaneous particle transport barrier has been observed in Ohmic discharges without any external momentum input. The barrier was evidenced by a density perturbation study using modulated supersonic molecular beam injection (SMBI) and microwave reflectometry. The new features of the non-local transport effect induced with SMBI have been analysed. The three-dimensional spectral structures of the low frequency zonal flow, the geodesic acoustic mode (GAM) and the quasi-mode-like low frequency fluctuations have been observed simultaneously for the first time. In addition, the spectral structure of the density fluctuations of GAM was also identified. The e-fishbone instability excited by energetic electrons deviated from Maxwellian distribution has been investigated via a 10-channel CdT(e) hard x-ray detector. It was found that the e-fishbone was correlated with the existence of energetic electrons of 30-70 keV. The MHD experiment has indicated that the suppression of m/n = 2/1 tearing modes may be sustained by ECRH modulation at a frequency of about 10 Hz.

Additional information

Authors: DUAN X R ET AL, Southwestern Institute of Physics, Chengdu (CN);LIU A D, University of Science and Technology of China, Hefei (CN);LAN T, University of Science and Technology of China, Hefei (CN);YU C X, University of Science and Technology of China, Hefei (CN);ZOU X L, Département de Recherches sur la Fusion Contrôlée, Association Euratom-CEA sur la Fusion, CEA Cadarache, Saint-Paul-lez-Durance (FR)
Bibliographic Reference: An article published in: Nuclear Fusion, Volume 49 (2009), 10pp.
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