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In this paper, we analyze the propagation effects of hilly and mountainous terrain on lightning magnetic fields by using a three-dimensional (3-D) finite-difference time domain (FDTD) method. We show that the waveshape, peak value and time delay of the magnetic fields can be significantly affected when propagating along a hilly terrain. It is found in particular that the time delay of the magnetic...
Magnetic field sensors utilizing tunneling magnetoresistance (TMR) effect often consists of two ferromagnetic layers with orthogonal anisotropy in a tunnel magnetoresistance structure [1]. In this report, we extend the study to a perpendicular magnetic anisotropic Ta/CoFeB/MgO/CoFeB/Ta junction with ferromagnetic-superparamagnetic pairs and introduce a new type magnetic field sensor. Because the magnetoresistance...
Developing high frequency soft magnetic thin films is still a hot issue due to the requirement of the technology in high frequency field. Traditionally, tuning the high frequency performance of magnetic thin films is realized by tuning the in-plane uniaxial anisotropy field of magnetic thin films with amorphous or nanocrystalline structure. There are several methods to obtain the in-plane uniaxial...
This paper presents a review on the improved magnetron modelling which was achieved by exploiting a newly-developed software tool to automate the model definition in command-line solvers. The software was designed to work with the renowned MAGIC command-line software, by introducing pre-processing functions which assist the user to enter the required parameters using a 3D graphical interface. This...
The basic operation principle of microwave oscillators, such as magnetrons, is based on the motion of electrons under a combined influence of electric and magnetic fields. In such process, the DC energy is converted into the RF energy via the interaction process between the electrons and the surrounding electromagnetic field. This nonlinear process provides sufficient conditions in generating rather...
The MuCool Experiment has been continuing to take data with 805 and 201 MHz cavities in the MuCool Test Area. The system uses RF power sources from the Fermilab Linac. Although the experimental program is primarily aimed at the Muon Ionization Cooling Experiment (MICE), we have been studying the dependence of RF limits on frequency, cavity material, high magnetic fields, gas pressure, coatings, etc...
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