Interaction of dynamic magnetic island with bootstrap current in toroidal plasmas is investigated based on the first principles of kinetic simulation.The perturbed magnetic and electric fields associated with the dyna...Interaction of dynamic magnetic island with bootstrap current in toroidal plasmas is investigated based on the first principles of kinetic simulation.The perturbed magnetic and electric fields associated with the dynamic magnetic island are calculated from a three-dimensional toroidal MHD code(CLT),instead of artificial imposed magnetic island perturbation.Inside the static magnetic island,the bootstrap current decreases as expected with the effective collision frequency.The radial electric field Erassociated with dynamic island could cause the E×B drift,which can noticeably modify the bootstrap current distribution.If the bootstrap current turns on when the tearing mode saturates,the widths of magnetic islands ascend rapidly and saturate again for both static and dynamic cases.But the saturated island width of the dynamic case is smaller than that of the static case because the magnetic islands in the dynamic case rotate due to strong asymmetric distribution of the bootstrap current in the vicinity of the X-points.展开更多
This paper proposes a novel low distortion high linearity CMOS bootstrapped switch, and the proposed switch can alleviate the nonlinear distortion of the on-resistance by eliminating first order signal-dependent varia...This paper proposes a novel low distortion high linearity CMOS bootstrapped switch, and the proposed switch can alleviate the nonlinear distortion of the on-resistance by eliminating first order signal-dependent variation of the overdrive voltage. Based on a 0.18 mm standard CMOS process, the simulation results show that at 100 MHz sampling clock frequency and 49 MHz input signal with 2Vpp, the proposed switch in differential mode has a Spurious-Free Dynamic Range(SFDR) of 90.1 dB.展开更多
基金supported by the National Key Research and Development Program of China(Nos.2022YFE03100000,2019YFE03020003 and 2019YFE03030004)National Natural Science Foundation of China(Nos.11835010,12305236 and 12375224)Innovation Program of Southwestern Institute of Physics(No.202301XWCX001)。
文摘Interaction of dynamic magnetic island with bootstrap current in toroidal plasmas is investigated based on the first principles of kinetic simulation.The perturbed magnetic and electric fields associated with the dynamic magnetic island are calculated from a three-dimensional toroidal MHD code(CLT),instead of artificial imposed magnetic island perturbation.Inside the static magnetic island,the bootstrap current decreases as expected with the effective collision frequency.The radial electric field Erassociated with dynamic island could cause the E×B drift,which can noticeably modify the bootstrap current distribution.If the bootstrap current turns on when the tearing mode saturates,the widths of magnetic islands ascend rapidly and saturate again for both static and dynamic cases.But the saturated island width of the dynamic case is smaller than that of the static case because the magnetic islands in the dynamic case rotate due to strong asymmetric distribution of the bootstrap current in the vicinity of the X-points.
基金Supported by the National Natural Science Foundation of China(Grant No.61404043)Doctoral Program Foundation of Institutions of Higher Education of China(No.201201111-20008)Key Laboratory of Infrared Imaging Materials and Detectors,Shanghai Institute of Technical Physics,Chinese Academy of Sciences(No.IIMDKFJJ-13-06)
文摘This paper proposes a novel low distortion high linearity CMOS bootstrapped switch, and the proposed switch can alleviate the nonlinear distortion of the on-resistance by eliminating first order signal-dependent variation of the overdrive voltage. Based on a 0.18 mm standard CMOS process, the simulation results show that at 100 MHz sampling clock frequency and 49 MHz input signal with 2Vpp, the proposed switch in differential mode has a Spurious-Free Dynamic Range(SFDR) of 90.1 dB.
