4 Irradiation Facility and Setup

The heavy ion species used for the SEL studies on this product were provided and delivered by the Facility for Rare Isotope Beams (FRIB) at Michigan State University (FRIB Single Event Effects (FSEE) Facility’s linear accelerator.) The FSEE Facility has a dedicated beamline built on the FRIB linac infrastructure with a user experimental station at the end of the FSEE beamline. Ion beams are delivered with high uniformity over a 1-inch diameter exposure area using a thin vacuum window. For this study, ion flux of 1 × 10⁵ ions / cm²-s was used to provide heavy ion fluence of 1 × 10⁷ ions / cm² using ¹²⁹Xe ion at a linac energy of 25 MeV / µ. Ion beam uniformity for all tests was 97.5%.

Figure 4-1 shows one of the four SN55LVRA4-SEP test boards used for experiments at the MSU facility. The in-air gap between the device and the ion beam port window was maintained at 70mm for all runs.

The heavy-ion species used for the SET studies on this product were provided and delivered by the TAMU Cyclotron Radiation Effects Facility using a superconducting cyclotron and an advanced electron cyclotron resonance (ECR) ion source. At the fluxes used, ion beams had good flux stability and high irradiation uniformity over a 1in diameter circular cross-sectional area for the in-air station. Uniformity is achieved by magnetic defocusing. The flux of the beam is regulated over a broad range spanning several orders of magnitude. For this study, ion flux of 10⁵ ions / cm² * s were used to provide heavy-ion fluences of approximately 10⁷ ions / cm² for SET testing. For the experiments conducted on this report, ¹⁰⁹Ag ions at angle of incidence of 0° for an LET_EFF of 47MeV × cm² / mg were used. The total kinetic energy of ¹⁰⁹Ag in the vacuum is 1.634GeV (15 MeV/nucleon). Ion uniformity for these experiments was between 93% and 97%.

Figure 4-2 shows the SN55LVRA4-SEP test board used for experiments at the TAMU facility. The in-air gap between the device and the ion beam port window was maintained at 40mm for all runs.

Figure 4-1 SN55LVRA4-SEP Evaluation Board at the MSU Facility

Figure 4-3 SN55LVRA4-SEP Beam Line Setup at TAMU Facility

Figure 4-2 SN55LVRA4-SEP Evaluation Board at TAMU Facility

Figure 4-4 SN55LVRA4-SEP Thermal Image for SEL