Topic
Shields
About: Shields is a research topic. Over the lifetime, 1456 publications have been published within this topic receiving 10896 citations.
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TL;DR: In this article, a measure to achieve the acceleration voltage of 1 MV for the vacuum insulated beam source (VIBS) has been developed by integrating previous empirical scaling of the voltage holding capability for plane and coaxial electrodes and new scaling for corner region where locally-concentrated electric field is generated.
Abstract: For the realization of the ITER neutral beam (NB) system, a measure to achieve the acceleration voltage of 1 MV for the vacuum insulated beam source (VIBS) has been developed. In addition, the design basis for 1 MV vacuum insulation has also been developed by integrating previous empirical scaling of the voltage holding capability for plane and coaxial electrodes and new scaling for corner region where locally-concentrated electric field is generated. The scaling clarified that a product of electric field and voltage obtained by the electric field analysis in the beam source vessel was much higher than the allowable level. Therefore, in order to improve the voltage holding capability, electrostatic shields having intermediate potential have been proposed. Consequently, it was found that the VIBS needs to be surrounded by more than three intermediate shields instead of a single gap insulation of 1 MV. Reliability of the design basis of the developed intermediated shields has been experimentally verified by improving the 1.3 m single gap insulation in the voltage holding test. As a result, the sustainable voltage has been significantly improved from 0.7 MV with the single gap to 1 MV with the shields up to the power supply limit. This result ensures the realization of the 1 MV VIBS in the ITER NB system.
10 citations
TL;DR: In this article , the current progress of hydrogel-based EMI shields was reviewed, in the meanwhile, some novel studies about pore structure design that will help advance the development of hydrogramel-Based EMI shielding materials were also included.
Abstract: Abstract With the rapid development of the electronic industry and wireless communication technology, electromagnetic interference (EMI) or pollution has been increasingly serious. This not only severely endangers the normal operation of electronic equipment but also threatens human health. Therefore, it is urgent to develop high-performance EMI shielding materials. The advent of hydrogel-based materials has given EMI shields a novel option. Hydrogels combined with conductive functional materials have good mechanical flexibility, fatigue durability, and even high stretchability, which are beneficial for a wide range of applications, especially in EMI shielding and some flexible functional devices. Herein, the current progress of hydrogel-based EMI shields was reviewed, in the meanwhile, some novel studies about pore structure design that we believe will help advance the development of hydrogel-based EMI shielding materials were also included. In the outlook, we suggested some promising development directions for the hydrogel-based EMI shields, by which we hope to provide a reference for designing hydrogels with excellent EMI shielding performance and multifunctionalities.
10 citations
01 Dec 1969
TL;DR: In this paper, an expository overview of cable shields and shielding quality is given, up to and including the V.H.F. band, leading to the problem of evaluating different shields whilst still at the design stage.
Abstract: : An expository overview of cable shields and shielding quality is given, up to and including the V.H.F. band, leading to the problem of evaluating different shields whilst still at the design stage. The changes in shielding effectiveness brought about by small design changes can be adequately gauged by the measurement of surface transfer impedance on short sample lengths. The frequency range for the measurements presented in this paper on all types of shield is up to 300 MHz. Some experimental results are presented and discussed, including a section on copolymer bonded aluminum sheaths. Here a study was made of the effects of overlap width and bonding copolymer thickness.
9 citations
TL;DR: In this article, a new method for calculating gamma-ray buildup factors in multilayer shields was proposed, which combines the buildup of single-layer shields with products and quotients.
Abstract: This study proposes a new method for calculating gamma-ray buildup factors in multilayer shields. The formula combines the buildup of single-layer shields with products and quotients. The tests have shown that the approximating formula reproduces the reference data of double layer shields very well for most cases. With the same parameters and with a new physical consideration that takes into account in a global way the degradation of the gamma-ray energy spectrum, the buildup factors of three and five layer shields were also very well reproduced. The new formula is incorporated in the new version of the MERCURE-6 point-kernel code.
9 citations
12 May 2014
TL;DR: In this paper, Toroidal magnet systems based wound with Ti clad MgB2 conductor is proposed and described, which have a bending power sufficient to deflect out of the habitat charged particles with kinetic energy in the order of 1 GeV.
Abstract: The interest on shields to protect astronauts I long term missions against GCR has recently grown and several projects have been funded. Due to their large mass, passive shields for large volume habitable modules are no longer an option and the attention is focused on the more complex, technologically challenging active systems. Among the possible solutions, the most promising is based on huge superconducting coils having a bending power sufficient to deflect out of the habitat charged particles with kinetic energy in the order of 1 GeV. Toroidal magnet systems based wound with Ti clad MgB2 conductor is proposed and described.
9 citations