Electromagnetic zonal flow residual responses

The collisionless axisymmetric zonal flow residual calculation for a tokamak plasma is generalized to include electromagnetic perturbations. We formulate and solve the complete initial value zonal flow problem by retaining the fully self-consistent axisymmetric spatial perturbations in the electric and magnetic fields. Simple expressions for the electrostatic, shear and compressional magnetic residual responses are derived that provide a fully electromagnetic test of the zonal flow residual in gyrokinetic codes. Unlike the electrostatic potential, the parallel vector potential and the parallel magnetic field perturbations need not relax to flux functions for all possible initial conditions.

The Implementation of Information Receiving and Sharing of Satellite Cloud Image under the Complex Electromagnetic Environment

Take the electromagnetic test of WT-8D satellite cloud image receiving system at a meteorological satellite ground station as an example, the test philosophy is analyzed, the test arrangement is made, and the maximum permissible value of level interference under the test requirements is calculated. By comparing the measuring data and the maximum permissible value of level interference, the relations between the antenna frequency and the value of level, the location of interference source, the intensity of interference source, and the generation laws of interference are all grasped. Aiming at the interference source, two methods are proposed respectively in this paper to inhibit the interference, one in the frequency domain and the other in the spatial domain. Then the method of information sharing of meteorological satellite cloud image is analyzed and discussed. As a conclusion, the receiving and transmittal quality of the meteorological satellite cloud image are improved, to prepare for the anti-electromagnetic interference in high tech local area in the future.