Shields

About: Shields is a research topic. Over the lifetime, 1456 publications have been published within this topic receiving 10896 citations.

Transmission of Intermediate-Energy Neutrons and Associated Gamma Rays Through Iron, Lead, Graphite, and Concrete Shields

Abstract: Spectral measurements of intermediate-energy neutrons (i.e., En ≤ 65 MeV) transmitted through iron, lead, graphite, and concrete shields are described. Concurrently, transmitted spectra of associat...

Effects of conducting shields on the performance of pulsed rotating machines

Abstract: Conducting shields are often used in pulsed rotating machines to protect the surrounding electronic devices and humans from exposure to high oscillating magnetic fields. These conducting shields are subjected to rotating magnetic fields due to excitation currents in rotor windings. This induces eddy currents, which reduce the magnitude of the operating component of magnetic fields (radial component in drum machine and axial component in disk machine), and thus reduce the mutual inductance between rotor and stator windings. The eddy currents also induce drag torques on the rotor windings, which results in a degradation of machine performance. In this paper, both disk and drum pulsed alternators are investigated by the finite element code EMAP3D. The effects of conducting shields on drag torques and the operating components of the magnetic field are studied, and the results are presented as functions of the gap between the rotor and the shield.

Transient Response of Braided-Wire Shields

Abstract: We present time-domain measurements to determine the shielding properties of braided coaxial cables. We show the influence of the transfer inductance and capacitance for various geometrical structures of the braid and, furthermore, that the waveform of the response signal depends on the optical coverage ratio of the shield.