Gong Xianzu's research while affiliated with Hefei Institute of Physical Sciences, Chinese Academy of Sciences and other places
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Publications (6)
For safe operation with active water cooling plasma facing components (PFCs) to handle a large input power over a long pulse discharge, some design optimization, R&D and maintenance were accomplished to improve the in-vessel components. For the purpose of large plasma current (1 MA) operation, the previous separated top and bottom passive stabilize...
Experimental progress of lower hybrid current drive (LHCD) and ion Bernstein wave (IBW) heating was achieved significantly in HT-7. Long pulse plasmas, up to 400 s, were obtained by LHCD. High power lower hybrid wave (LHW), with PLHW of 800 kW at 2.45 GHz, was launched and the current drive efficiency was studied for different wave powers. Electron...
Reconstruction of experimental axisymmetric equilibria is an important part of tokamak data analysis. Fourier expansion is applied to reconstruct the vessel current distribution in EFIT code. Benchmarking and testing calculations are performed to evaluate and validate this algorithm. Two cases for circular and non-circular plasma discharges are pre...
An improved ohmic confinement has been achieved on HT-6M tokamak after application of edge ohmic heating pulse which makes plasma current rapidly ramp up (0.4 ms) in a ramp rate of 12 Ma/s. The improved ohmic confinement phase is characterized by (a) energy and particle confinement time increase, (b) non-symmetric increased density ne, (c) reduced...
Growth rates of the axisymmetric mode in elongated plasmas in the experimental advanced superconducting tokamak (EAST) are measured with zero feedback gains and then compared with numerically calculated growth rates for the reconstructed shapes. The comparison is made after loss of vertical position control. The open-loop growth rates were scanned...
Spectroscopic diagnostics have been extensively developed for studies of impurity and neutral particle transports at core and edge plasmas in LHD. Diagnostics of core plasmas are similar to a tokamak case, i.e., Zeff from visible bremsstrahlung, K-x-ray measurements from x-ray spectroscopy using Si(Li) detectors and a compact crystal spectrometer,...
Citations
... For long-pulse and high performance operations, EAST has been installed two set of lower hybrid waveguide antennas (LHWA), 4.6 GHz and 2.45 GHz in the equatorial ports, which are located in the E port and N port respectively. The guard limiter (GL) with graphite tiles of LHWA has experienced the plasma discharges since 2014 [2][3][4]. However, a large number of hot spots were observed on the surface of the GL using infrared (IR) cameras in the recent discharges, as shown in Fig. 1, especially in the 4.6 GHz LHWA, which is the main auxiliary heating facility for EAST tokamak. ...
... In general, the impurity transport coefficients, i.e. the diffusion coefficient D(r) and convective velocity V (r), have been studied by injecting an impurity tracer based on the laser blow-off (LBO) technique [11][12][13][14][15] and pellet injection [16,17]. Although a one-dimensional (1D) impurity transport code is commonly used for the analysis of such an experiment, the study is mainly focused on the impurity transport in the plasma core region due to the difficulty in the analysis of the time-dependent signal in the outer region in plasmas with ρ > 0.8, in addition to the poloidally asymmetric neutral source. ...
... Note that, in Fig. 4.18, all the black colors refer to the network results, while the green colors are for the expert, and the orange colors are related to the novice. To reconstruct the plasma, we use an algorithm called EFIT [73] which is a reconstruction code widely used in various tokamaks [74,79,[155][156][157], where we use all 45 recovered ψ Furthermore, as a result of χ 2 = ((ψ EF IT − ψ used )/σ) 2 (Fig. 4.18C and F), we can clearly distinguish the reconstruction qualities such that the χ 2 for the novice's trial is significantly higher than those of the expert as well as the network. It also would be noted that the total summation of the network χ 2 for the ramp-up case (Fig. 4.18C) is 2.78 which is lower than the expert's case, i.e., the total sum of χ 2 = 3.77 where only 8 signals participate in the reconstruction. ...
... Lower hybrid (LH) waves have been used for many years on numerous tokamaks (C-MOD [1], EAST [2], HT-7 [3], JET [4], Tore Supra [5] and TRIAM-1 M [6]) to drive a toroidal current in the plasma. In superconducting machines (Tore Supra, TRIAM-1 M, EAST, HT-7), long pulse operation has been successfully demonstrated using lower hybrid current drive (LHCD), drawing benefit both from the high current drive (CD) efficiencies, well above those of other auxiliary heating systems, and the ability to drive an off axis current. ...
