Novel materials or multilayers can help to reduce the mass requirement for radiation shielding of electronic components significantly In this paper, potential alternatives to the standard aluminum shielding approach are assessed by the Monte-Carlo simulations and promising candidates are manufactured and characterized by radiation tests including proton and electron tests The transmission of energetic protons of up to 39 MeV through the shielding solution was assessed as well as the dose deposited by energetic electrons up to 12 MeV in Radiation sensing field-effect transistor (RADFETs) and Alanine dosimeters behind the shield

Characterization of Novel Lightweight Radiation Shielding Materials for Space Applications

A design methodology for composite space enclosures was generated. As a result a panel of an electronics housing structure, as part of a general satellite traversing both GEO and LEO, was designed and optimized. A mass saving of 18% was achieved over a conventional aluminum panel, while assuring structural integrity for acceleration loads, avoiding vibrational resonance with other satellite components, allowing electrical conductance, providing sufficient radiation protection from the harsh space environment and at the same time assuring manufacturability. The optimized structure was composed of layers of carbon fiber composite and tungsten foils. For radiation purposes the layers were placed asymmetric around the geometric midplane, resulting in shape distortions due to residual thermal stresses from the curing process. These shape distortions were kept to a minimum. The validity of the theoretical models was assessed by means of testing for shape distortions, radiation attenuation, bonding strength and electrical resistivity. The bonding of the tungsten with the prepreg material was found to be problematic, but an improvement in lap shear strength was found with respect to methods proposed in the literature. A chemical etching surface treatment with a reduced etching time of one minute was proposed for the tungsten foils.

/pdf/a-multidisciplinary-optimization-of-composite-space-4y1it9bzpm.pdf

A Multidisciplinary Optimization of Composite Space Enclosures

The tendency to reduce the spacecraft mass covers nowadays all components of the spacecraft. One potential target is to reduce the mass of electronics and its housings. The use of composite materials, especially CFRP is a well known and vastly used approach to mass reduction. In cost reduction the use of standard (non-space qualified) electronics has increased. These commercial circuits and other components cannot tolerate as high radiation levels as space qualified components. Therefore the use of standard electronics components poses challenge in terms of the radiation protection capability of the ADPMS housings. The main goal of this study is to give an insight on the radiation shielding protection produced by different configurations of CFRP wolfram laminates of epoxies and cyanate esters and then to compare them to the protection given by the commonly used laminates of aluminium. For a spacecraft operating in LEO and MEO orbits the main components of the space radiation environment are energetic electrons and protons, therefore in our study we will compare the experimental and simulation results of the radiation attenuation of different types of laminates for those particles. At the same time the experimental data has been used to validate the Geant4 model of the laminates, which can be used for future optimizations of the laminate structures.

Radiation Shielding Study of Advanced Data and Power Management Systems (ADPMS) Housing Using Geant4

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Radiation Shielding Study of Advanced Data and Power Management Systems (ADPMS) Housing Using Geant4

Radiation Shielding Study of Advanced Data and Power Management Systems (ADPMS) Housing Using Geant4