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The purpose of our research work is to evaluate some electrical properties of electron beam irradiated insulating materials for spacecraft. The spacecraft like a communication or a broadcasting satellite flying in GEO (Geostationary Orbit) is always exposed to plasma and/or radioactive-rays such as α-, β-, and γ-rays. When the insulating materials, in which the spacecraft is wrapped to keep temperature...
We evaluate the dielectric characteristic of polymeric materials for MLI (Multi Layer Insulator, a kind of thermal insulation material) for spacecraft under high energy proton irradiation using results of space charge distribution. Spacecrafts have a serious damage due to the electro-static discharge accident. The electric charges are accumulated in the polymeric materials due to radioactive rays,...
The purpose of our research work is to measure the space charge distribution in proton beam irradiated dielectric materials used for spacecraft. Spacecrafts sometimes have a serious damage due to the electro-static discharge accident. It is said that the charge accumulation in dielectric materials irradiated by high energy particles in space environment causes the discharge accident. Therefore, we...
Charge accumulations in electron beam irradiated polymers are investigated by observing them using pressure wave propagation method. The purpose of our research work is to measure the charge distribution in electron beam irradiated dielectric materials for spacecrafts. We have been developing a system for measuring such a charge distribution in dielectric materials. Using this system, we tried to...
Charge storage properties in polymers are important phenomena to evaluate the performance of them under electron beam irradiation in such as space environment, plasma processing, electron microscopy, and so on. Authors have been developing to measure the charge distribution in polymers during the electron beam irradiation using the Pressure Wave Propagation (PWP) technique. Using the developed system,...
Recently, some accidents in spacecraft due to charging up by irradiation of charged particles have been reported. Some of them are caused by a surface discharge, which normally takes place in a plasma environment in space. Some others seem to be caused by a discharge due to an accumulation of charge in the bulk of materials in a relatively high-altitude environment. To investigate the charge accumulation...
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