1 Recent Radiation Test Results at JPL
This Bruce E. Pritchard, Member, ZEEE, Bemard G. Rax, and Steven S. McClure paper documents recent TID (including ELDRS) and proton damage test results obtained by JPL. Unusual test results, such as abnormally low or high failure levels or unusual failure or response mechanism, are emphasized.
Total ionizing dose (TID) evaluation results of low dose rate testing for NASA programs
Low dose rate radiation testing in the range of 0.01-0.20 rads(Si)/s has been performed at Goddard Space Flight Center on a wide variety of non-RH (rad-hard) part types in the last few years. This paper reports on recent test results of EEPROMs, Operational Amplifiers, Analog-to-Digital Converters (ADCs) and Digital-to-Analog Converters (DACs), and DC-DC converters. These results have shown that non-RH parts are suitable for many low earth orbiting satellites, where predicted mission total dose requirements may be in the range of 0.5-10 krads(Si). However, a careful characterization of non-RH parts should be performed to verify that the parts meet the requirements of their intended application in the projected mission radiation environment.
Monte Carlo simulations of magnetovolume instabilities in anti-Invar systems
We perform constant pressure Monte Carlo simulations of a spin-analogous model which describes coupled spatial and magnetic degrees of freedom on an fcc lattice. Our calculations qualitatively reproduce magnetovolume effects observed in some rare earth manganese compounds, especially in the anti-Invar material YMn2. These are a sudden collapse of the magnetic moment which is connected with a huge volume change, and a largely enhanced thermal expansion coefficient.