High-End Space Electronics: Active Shielding to Mitigate Catastrophic Single-Event Effects

TL;DR

This work introduces the COTS-Capsule, a non-intrusive CSEE mitigation system that uses a six-faced array of detectors and a real-time mitigation algorithm to power-cycle potentially damaged electronics, enabling safer use of COTS components in space. The approach targets high-Z, high-energy ions (HZE) by estimating particle trajectories and energy deposition to decide when a power cycle is warranted, thereby minimizing interruptions. Validation combines SRIM/Gaussian-based emulation with GEANT4/CREME96 simulations and ISS-based empirical data, showing strong agreement and achieving a 95% true-positive rate with cycling rates on the order of seven hours per cm$^2$, which can extend electronics lifetimes by ~20×. The results support broader adoption of COTS electronics in space missions, reducing cost and qualification barriers while maintaining reliability in harsh radiation environments.

Abstract

Operating electronic systems in space environments presents significant challenges due to continuous exposure to cosmic, solar, and trapped radiation, which can induce catastrophic single-event effects. This paper introduces a novel nonintrusive mitigation apparatus designed to protect high-end commercial off-the-shelf electronics in space. The apparatus incorporates an array of real-time particle detectors coupled with a mitigation algorithm. Upon identifying potentially harmful particles, the system power cycles affected electronics, preempting permanent damage. The apparatus was evaluated using GEANT4 simulations, which were compared with empirical data from the "COTS-Capsule" experiment aboard the International Space Station, demonstrating strong agreement. Key results indicate that the system achieves a 95% detection accuracy with a power cycle rate of once every seven hours per square centimeter of sensitive electronics. The COTS-Capsule represents a cost-effective, flexible solution for integrating modern, high-end, non-space-qualified electronics into a variety of space missions, addressing critical challenges in the new-space era.

Figures (7)

• Figure 1: Illustration of a COTS-Capsule apparatus. A CSEE-sensitive COTS electronic board (3D model of Teensy® LC with permission) is encapsulated within a rectangular prism-shaped casing encompassing two particle detectors (clear) on each side of the prism's faces. A particle (blue ball) traverses the top two detectors and impinges a sensitive component. The particle track is also illustrated (blue track).
• Figure 2: Installation of the COTS-Capsule aboard the ISS, undertaken by NASA astronaut Kayla Barron (image courtesy of NASA/Voyager Space).
• Figure 3: CAD model of the COTS-Capsule spaceborne experiment that was launched and operated aboard the ISS. The ISS provides power and communication through two Mill-Max connectors at the top. On the right side, a five-layer hodoscope contains five vertically-stacked SSPDs SSPD, connected to a DAQ DT5702 via coaxial cables. The CAEN DT5702 readout electronics board dt5702 is positioned at the bottom in red. The central section houses the onboard computer, which includes a Raspberry Pi (RPi) board RaspberryPi with an attached custom-designed daughter board.
• Figure 4: The first results of the spaceborne COTS-Capsule experiment. Heat maps of the particle flux measured onboard the ISS (2022). (a) All particles detected by the COTS-Capsule. To improve the discernibility of flux variability across non-SAA locations, the particle flux depicted is truncated at a fixed threshold. (b) The HZE ion flux detected by the COTS-Capsule.
• Figure 5: Side view of the hodoscope, depicting the particle detector array SSPD within the spaceborne COTS-Capsule experiment COTS-CAPSULE-SYSTEM. The red rectangle, shown in the middle of the orange-framed scintillator, emulates a sensitive electronic-component. The solid blue and dashed green tracks represent particles traversing the middle particle detector, possibly triggering a CSEE. All units are in millimeters.