The effects of replacement of lanthanum by neodymium and praseodymium on the electrode characteristics were studied. The result indicated that the discharge capacity and cycle life are closely related with the alloy s...The effects of replacement of lanthanum by neodymium and praseodymium on the electrode characteristics were studied. The result indicated that the discharge capacity and cycle life are closely related with the alloy structure decided by alloy composition. The electrode with praseodymium have higher discharge capacity than that with neodymium. The replacement of lanthanum by both neodymium and praseodymium gave the electrodes higher discharge capacity and longer cycle life. The selected area diffraction pattern from the interface between two particles after 120 charge discharge cycles showed that the polycrystalline diffraction rings created from oxides and hydroxides can be observed and X ray diffraction analysis verified this conclusion.展开更多
In the contemporary large tokamak, the disruptive termination of a discharge will reduce the lifetime of the first wall materials because of the intense heat flux at the energy quench and the intense runaway electrons...In the contemporary large tokamak, the disruptive termination of a discharge will reduce the lifetime of the first wall materials because of the intense heat flux at the energy quench and the intense runaway electrons during the current quench, and generate high electromagnetic forces on vacuum vessel components. The system of disruption warner must be established in the HL-2A tokamak. MHD real-time measuring and processing system has been designed and implemented. The system can be predicted the auras of dischage disruption in real-time, the energy quench and the current quench can be avoidanced.展开更多
文摘The effects of replacement of lanthanum by neodymium and praseodymium on the electrode characteristics were studied. The result indicated that the discharge capacity and cycle life are closely related with the alloy structure decided by alloy composition. The electrode with praseodymium have higher discharge capacity than that with neodymium. The replacement of lanthanum by both neodymium and praseodymium gave the electrodes higher discharge capacity and longer cycle life. The selected area diffraction pattern from the interface between two particles after 120 charge discharge cycles showed that the polycrystalline diffraction rings created from oxides and hydroxides can be observed and X ray diffraction analysis verified this conclusion.
文摘In the contemporary large tokamak, the disruptive termination of a discharge will reduce the lifetime of the first wall materials because of the intense heat flux at the energy quench and the intense runaway electrons during the current quench, and generate high electromagnetic forces on vacuum vessel components. The system of disruption warner must be established in the HL-2A tokamak. MHD real-time measuring and processing system has been designed and implemented. The system can be predicted the auras of dischage disruption in real-time, the energy quench and the current quench can be avoidanced.
