[en] The electric parameters change during discharge is studied and the relationship between non-equilibrium degree and parameters is discussed for gliding arc discharges. Using two-channel model, the rules of arc moving due to effect of the airflow is simulated. The numerical simulation results can help analyzing the generation mechanism of gliding arc non-equilibrium plasma. (authors)

[en] Two 1.4 MW high voltage power supply (HVPS) modules with 3-5 s pulse duration have been developed for LHCD experiment in the HT-7 tokamak. The power source consists of a pulsed generator and the electric circuit. Duration of the ultra-long-pulse is controlled by switching-on dc relay immediately and switching-off ac contactor after a given time, and the fast protection is executed by a crowbar. Due to the soft starting of the power source, the problem of overvoltage induced by dc relay switching-on has been solved. Each power supply module outputs a rated power (-35 kV, 40 A) on the dummy load. With the klystrons connected as the load of the power supply modules, LHCD experiments have been conducted successfully in the HT-7 tokamak

[en] RFP experimental results with high plasma current density and enhanced plasma temperature have been obtained in discharges with slow ramping current. Long time enhancement of the toroidal magnetic flux and MHD activities are observed. Toroidal flux is increased as the plasma current ramps up. It is observed that the enhancement of the toroidal magnetic flux is not uniform. In the discharges there is a MHD dynamo effect. Discharge parameters (plasma current of 100 kA, plasma sustained time of 800 μs, T_e of 70 eV and T_i of 85 eV) are obtained in RFP experiments

[en] The author presents the study of lower hybrid current drive (LHCD) on the HL-1M tokamak. During LHCD particle confinement was improved and the MHD disturbances were suppressed completely. In the case of high density, the plasma was heated greatly by the lower hybrid wave (LHW). Analysis shows that mechanism of improvement of particle confinement links to the redistribution of radial electric field while LHW heating of ions is related to the parametric decay instability (PDI)

[en] Based on standard neoclassical models of plasma rotation, a ROTATE CODE is developed. The toroidal and poloidal rotation velocities of main ions and impurity ions are studied numerically under conventional operation parameters in the HL-1M tokamak. Computational results are reasonably consistent with experimental results measured with Mach probes in the edge region. They are useful for choosing experiment methods and analysing experiment data

[en] A quantitative analysis for dynamic stability of a set of superconducting partial torus in a fusion reactor under a pulse current over a stationary current is given. When the stationary working current is lower than the critical current of the electromagnetic-elastic system, a numerical program is established to simulate the dynamic responses of the deformation of the current-carrying magnet subjected to a pulse current with rectangular shape. After that, the authors give the regions of the dynamic instability on the parameters of stationary current, magnitude of pulse current, and duration of the pulse

[en] In tokamak plasma radiation diagnostics, if the width of a detected plasma chord is comparable with the plasma minor radius, the plasma boundary may influence the line-integrated emissivity considerably and make it a weighted integral of the width-averaged emissivity. The explicit formula for the line-integrated emissivity with taking into account the plasma boundary effect is presented

[en] Using Monte Carlo simulation,the energy distribution of heavy particles bombarding negative wall under different discharges is studied. It is shown that various particle energy distributions in front of the cathode wall depend on the electric field and the collision frequency. The density of low-energy fast atoms (N_f) is nearly two magnitudes higher than that of high-energy particles (N⁺) in front of the cathode. Under the condition corresponding to the highest creation rate of active species (N⁺, N_f), suitable decrease in gas pressure, and increase in discharge voltage and gas temperature will be beneficial to the active particles reaching a cathode

[en] Measurements of impurity radiation in the HL-1M tokamak are given. During the molecular beam injection, the plasma electron density rises and the shift impurity concentration reduces obviously. The shift of impurity radiation peaking relative to the injection pulse is caused by the molecular agglomeration

[en] A simplifying Mach probe for measuring non-parallel flows in the tokamak edge plasma is proposed on the basis of existing Mach probes and probe sheath theories for flows parallel to the magnetic field