The plasma current is modulated with an alternating current （ac） component in a frequency range of 90 Hz - 900 Hz in the plateau discharge phase in the CT-6B tokamak. A plasma electric conductivity profile in a form...The plasma current is modulated with an alternating current （ac） component in a frequency range of 90 Hz - 900 Hz in the plateau discharge phase in the CT-6B tokamak. A plasma electric conductivity profile in a form of （1 - r^2/a^2）^α with a parameter α which is fitted with the experimental data, can be determined. The effects of magnetic shear in a tokamak field configuration on the current penetration are taken into account in the numerical simulation. The measurement method and obtained results are discussed.展开更多
Alternating current operation with one full cycle and a current level of 2.5kA have been achieved in the CT-6B tokamak. The poloidal magnetic field in the plasma is measured with two internal magnetic probes in repeat...Alternating current operation with one full cycle and a current level of 2.5kA have been achieved in the CT-6B tokamak. The poloidal magnetic field in the plasma is measured with two internal magnetic probes in repeated discharges. The current distribution is reconstructed with an inversion algorithm. The inversed current first appears on the weak field side. The existence of magnetic surfaces and rotational transform provide particle confinement in the current reversal phase.展开更多
A brief gas puffing method has been used to determine the amount of adsorbed gas on the surface of a vacuum system when the pressure in the system is changed.The adsorbed gas is found to correspond to one monomolecula...A brief gas puffing method has been used to determine the amount of adsorbed gas on the surface of a vacuum system when the pressure in the system is changed.The adsorbed gas is found to correspond to one monomolecular layer in this experiment.展开更多
A high density experiment has been performed by gas puffing on CT-6B tokamak.The changes in the plasma parameters caused by the gas puffing are described.The ionization efficiency measured in the experiment is about 0...A high density experiment has been performed by gas puffing on CT-6B tokamak.The changes in the plasma parameters caused by the gas puffing are described.The ionization efficiency measured in the experiment is about 0.5.The dependence of density limit on the injected gas flux is given.The maximum line-averaged electron density achieved is 4×10^(13)cm^(-3).展开更多
基金The project supported by the National Natural Science Foundation of China (Nos. 19789502 and 19889506)
文摘The plasma current is modulated with an alternating current （ac） component in a frequency range of 90 Hz - 900 Hz in the plateau discharge phase in the CT-6B tokamak. A plasma electric conductivity profile in a form of （1 - r^2/a^2）^α with a parameter α which is fitted with the experimental data, can be determined. The effects of magnetic shear in a tokamak field configuration on the current penetration are taken into account in the numerical simulation. The measurement method and obtained results are discussed.
基金the National Natural Science Foundation of China under Grant No.19785005the International Atomic Energy Agency Contract 8987/Regular Budget Fund.
文摘Alternating current operation with one full cycle and a current level of 2.5kA have been achieved in the CT-6B tokamak. The poloidal magnetic field in the plasma is measured with two internal magnetic probes in repeated discharges. The current distribution is reconstructed with an inversion algorithm. The inversed current first appears on the weak field side. The existence of magnetic surfaces and rotational transform provide particle confinement in the current reversal phase.
文摘A brief gas puffing method has been used to determine the amount of adsorbed gas on the surface of a vacuum system when the pressure in the system is changed.The adsorbed gas is found to correspond to one monomolecular layer in this experiment.
文摘A high density experiment has been performed by gas puffing on CT-6B tokamak.The changes in the plasma parameters caused by the gas puffing are described.The ionization efficiency measured in the experiment is about 0.5.The dependence of density limit on the injected gas flux is given.The maximum line-averaged electron density achieved is 4×10^(13)cm^(-3).
