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Proceedings Paper

The effects of heavy ion radiation on digital micromirror device performance
Author(s): Anton Travinsky; Dmitry Vorobiev; Zoran Ninkov; Alan D. Raisanen; Jonathan A. Pellish; Massimo Robberto; Sara Heap
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Paper Abstract

There is a pressing need in the astronomical community for space-suitable multi-object spectrometers (MOSs). Several digital micromirror device (DMD)-based prototype MOSs have been developed for ground-based observatories; however, their main use will come with deployment on a space based mission. Therefore, performance of DMDs under exoatmospheric radiation needs to be evaluated. In our previous work we demonstrated that DMDs are tolerant to heavy ion irradiation in general and calculated upset rate of 4.3 micromirrors in 24 hours in orbit for 1-megapixel device. The goal of this additional experiment was to acquire more data and therefore increase the accuracy of the predicted in-orbit micromirror upset rate. Similar to the previous experiment, for this testing 0.7 XGA DMDs were re-windowed with 2 μm thick pellicle and tested under accelerated heavy-ion radiation (with control electronics shielded from radiation) with a focus on detection of single-event upsets (SEUs). We concentrated on ions with low levels of linear energy transfer (LET) 1.8 – 13 MeV•cm2•mg-1 to cover the most critical range of the Weibull curve for those devices. As during the previous experiment, we observed and documented non-destructive heavy ion-induced micromirror state changes. All SEUs were always cleared with a soft reset (that is, sending a new pattern to the device). The DMDs we tested did not experience single-event induced permanent damage or functional changes that required a hard reset (power cycle), even at high ion fluences. Based on the data obtained in the experiments we predict micromirror in-orbit upset rate of 5.6 micromirrors in 24 hours in-orbit for the tested devices. This suggests that the heavy-ion induced SEU rate burden for a DMD-based instrument will be manageable when exposed to solar particle fluxes and cosmic rays in orbit.

Paper Details

Date Published: 22 July 2016
PDF: 9 pages
Proc. SPIE 9912, Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II, 99125W (22 July 2016); doi: 10.1117/12.2233240
Show Author Affiliations
Anton Travinsky, Rochester Institute of Technology (United States)
Dmitry Vorobiev, Rochester Institute of Technology (United States)
Zoran Ninkov, Rochester Institute of Technology (United States)
Alan D. Raisanen, Rochester Institute of Technology (United States)
Jonathan A. Pellish, NASA Goddard Space Flight Ctr. (United States)
Massimo Robberto, Space Telescope Science Institute (United States)
Sara Heap, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 9912:
Advances in Optical and Mechanical Technologies for Telescopes and Instrumentation II
Ramón Navarro; James H. Burge, Editor(s)

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