Shields

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

Effect of shields in perpendicular recording

Abstract: Micromagnetic simulations have been used to investigate magnetization dynamics in a perpendicular recording head with a trailing shield. The numerical experiment was carried out on a set of head models with shields. Trailing shields used in modelling had a thickness of 20 nm and spacing of 50, 100 and 150 nm from the trailing edge of the tip. Results of our investigations show that shields not only increase the gradient of the recording field but also help to generate more surface charges on the tip and on the SUL below it. For specific configurations and head to shield spacing (>50 nm) this leads to higher field magnitudes, leading to the 4–6% increase in the perpendicular field at 10 nm below ABS.

Muon shielding calculations: heterogeneous passive and active shields, applicat�ons to experimental beams and areas

Abstract: With the advent of a new generation of high-energy and high-intensity proton accelerators such as the one being built at the National Accelerator Laboratory and the one proposed by CERN, the problem of shielding external proton targets, the secondary beams produced from these targets, and even the secondary targets in the experimental areas becomes quite a massive and expensive project. In addition to the massive hadron shielding required, the high-energy muons produced by the decay of pions and kaons add large amounts of shielding especially in the forward (beam) direction. Homogeneous shields can be designed with programs which have been discussed previously. They have developed a computer program which allows them to design heterogeneous shields with voids and/or magnetic fields. The heterogeneous shields without magnetic fields are called passive shields and those with magnetic fields are called active shields. Results of some of the studies made on the design of such shields are presented. Specific application to the design of shielding for a primary external proton beam target and for a specific experiment are discussed.

Modelling of the Ship Structural Ballistic Shields from the 10GHMBA Steel

Abstract: The contemporary protective structures are now critical elements of the floating units, military, public and other objects. Their task is to weaken the effects of a terrorist action against selected areas with the use of explosives or projectiles. The knowledge of material behaviour at high strain rates is essential for designing the ballistic shields. The hull external shells of the Polish Navy ships now in service do not meet the requirements of ballistic anti-terrorist shields against small arms shooting or the rocket and shell splinters. This is a significant problem in the case of defending a ship against terrorist attack threats. Therefore, there is a tendency for building internal and external ballistic shields in the ship hull structure to protect the critical compartments and action stations. The paper presents investigations of materials subjected to high strain rates, with the 10GHMBA E-620 bainitic steel as an example. The experiments were carried out on the MTS 810.12 testing machine, rotary impact testing hammer, the Taylor test stand and on the ballistic pendulum. In the final part of the paper, some numerical simulations are presented allowing to analyse the fast-changing processes arising during loading the structure by an impact of high velocity bodies.