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, the authors designed a sub-Kelvin test platform to reach the required field uniformity for transition-edge sensors (TES) and their SQUID multiplexed readouts.
Abstract: The performance of transition-edge sensors (TES) and their SQUID multiplexed readouts is very sensitive to ambient magnetic field and its fluctuations. In order to run ground experiments on thousands of X-ray TES microcalorimeters with a small uniform ambient magnetic field (< 1 μT, with a uniformity < 0.1 μT), we need a very low ambient field to be trapped into the superconducting magnetic shields. We have designed a sub-Kelvin test platform to reach these specifications. For this purpose, we modeled a new design for the shielding consisting of a series of different mu-metal and superconducting shields, including a niobium shield at 50 mK, a cryoperm (A4K) shield at 3 K, and a mu-metal shield at 300 K. A magnetic field coil is used to vary the local perpendicular magnetic field over the TES array. To optimize this field, we have studied a number of different field-coil designs and the impact of the different shield geometries, in order to reach the required field uniformity.
3 citations
TL;DR: In this paper , the results of high velocity Space debris fragment interaction with thin metallic shields are presented and the formulas for determining critical thickness of the target preventing from penetration being functions of impactor mass, speed and material properties of both impactor and target are developed.
3 citations
01 Jun 1982
TL;DR: A preliminary design of the thermal protection system for the NASA Solar Probe spacecraft is presented in this paper, which satisfies maximum envelope, structural integrity, equipotential, and mass loss/contamination requirements by employing lightweight carbon-carbon emissive shields.
Abstract: A preliminary design of the thermal protection system for the NASA Solar Probe spacecraft is presented. As presently conceived, the spacecraft will be launched by the Space Shuttle on a Jovian swing-by trajectory and at perihelion approach to three solar radii of the surface of the Earth's sun. The system design satisfies maximum envelope, structural integrity, equipotential, and mass loss/contamination requirements by employing lightweight carbon-carbon emissive shields. The primary shield is a thin shell, 15.5-deg half-angle cone which absorbs direct solar flux at up to 10-deg off-nadir spacecraft pointing angles. Secondary shields of sandwich construction and low thickness-direction thermal conductivity are used to reduce the primary shield infrared radiation to the spacecraft payload.
3 citations
01 Mar 2018
TL;DR: In this paper, the preformance of finite size planar shields usually adopted in EMC practice against near field extremely low-frequency magnetic sources magnetic sources is investigated numerically with frequency-domain techniques and it is aimed at assessing the influence of shield constitutive parameters and the source distance on the shielding parameters.
Abstract: The preformance of finite size planar shields usually adopted in EMC practice against near field extremely low-frequency magnetic sources magnetic sources are here investigated. The analysis is performed numerically with frequency-domain techniques and it is aimed at assessing the influence of shield constitutive parameters and of the source distance on the shielding parameters.
3 citations