Neutral beam injector for EAST is designed to deliver deuterium beams with a power of 2 MW to 4 MW at an energy of 50 keV to 80 keV into the plasma with a beam dimension of 12 cm× 48 cm. Considering the beam gene...Neutral beam injector for EAST is designed to deliver deuterium beams with a power of 2 MW to 4 MW at an energy of 50 keV to 80 keV into the plasma with a beam dimension of 12 cm× 48 cm. Considering the beam generation and transmission, a columniform beam-line of Ф 250 cm × 400 cm is designed with a neutralizer, ion dump, calorimeter, bending magnet and cryopanels. The arrangement of the internal elements for the beam-line is reported. A rectangular sleeve coupled to the ion source is employed as the neutralizer. At the downstream of the neutralizer, a dipole magnet separates the residual ions from the beam passage with a reflection radius of 42 cm for the full energy particles. The calorimeter and the ion dump serve as high heat flux components, which will work as thermal inertia targets in the first phase of operation.展开更多
The pedestal characteristic is an important basis for high confinement mode （H- mode） research. Because of the finite spatial resolution of Thomson scattering （TS） diagnostic on Experimental Advanced Superconducti...The pedestal characteristic is an important basis for high confinement mode （H- mode） research. Because of the finite spatial resolution of Thomson scattering （TS） diagnostic on Experimental Advanced Superconducting Tokamak （EAST）, it is necessary to characterize the pedestal with a suitable functional form. Based on simulated and experimental data of EAST, it is shown that the two-line method with a bilinear fitting has better reproducibility of pedestal parameters than hyperbolic tangent （tanh） and modified hyperbolic tangent （mtanh） methods. This method has been applied to EAST type I edge localized mode （ELM） discharges, and the electron pedestal density is found to be proportional to the line-averaged density and the edge pressure gradient is found to be proportional to the pedestal pressure. Furthermore, the ion poloidal gyro-radius has been identified as the suitable parameter to describe the pedestal pressure width.展开更多
基金supported by National Natural Science Foundation of China (No. 10875146)the Knowledge Innovation Program of the Chinese Academy of Sciences:The study and simulation on beam interaction with background particles in neutralization area for NBI
文摘Neutral beam injector for EAST is designed to deliver deuterium beams with a power of 2 MW to 4 MW at an energy of 50 keV to 80 keV into the plasma with a beam dimension of 12 cm× 48 cm. Considering the beam generation and transmission, a columniform beam-line of Ф 250 cm × 400 cm is designed with a neutralizer, ion dump, calorimeter, bending magnet and cryopanels. The arrangement of the internal elements for the beam-line is reported. A rectangular sleeve coupled to the ion source is employed as the neutralizer. At the downstream of the neutralizer, a dipole magnet separates the residual ions from the beam passage with a reflection radius of 42 cm for the full energy particles. The calorimeter and the ion dump serve as high heat flux components, which will work as thermal inertia targets in the first phase of operation.
基金supported by National Natural Science Foundation of China(Nos.11275233 and 11405206)the National Magnetic Confinement Fusion Science Program of China(No.2013GB112003)Science Foundation of Institute of Plasma Physics,Chinese Academy of Sciences(No.DSJJ-15-JC01)
文摘The pedestal characteristic is an important basis for high confinement mode （H- mode） research. Because of the finite spatial resolution of Thomson scattering （TS） diagnostic on Experimental Advanced Superconducting Tokamak （EAST）, it is necessary to characterize the pedestal with a suitable functional form. Based on simulated and experimental data of EAST, it is shown that the two-line method with a bilinear fitting has better reproducibility of pedestal parameters than hyperbolic tangent （tanh） and modified hyperbolic tangent （mtanh） methods. This method has been applied to EAST type I edge localized mode （ELM） discharges, and the electron pedestal density is found to be proportional to the line-averaged density and the edge pressure gradient is found to be proportional to the pedestal pressure. Furthermore, the ion poloidal gyro-radius has been identified as the suitable parameter to describe the pedestal pressure width.
