4 Irradiation Facility and Setup

The heavy-ion species used for the SEE 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 10⁵ions/cm² × s were used to provide heavy-ion fluences of approximately 10⁷ions/cm² for SEL testing and ion flux of 10⁴ions/cm² × s were used to provide heavy-ion fluences of approximately 10⁶ions/cm² for SET testing.

For the experiments conducted on this report, ¹⁰⁹Ag ions at angle of incidence of 0° for an LET_EFF of 47.5MeV × cm²/mg were used. The total kinetic energy of ¹⁰⁹Ag in the vacuum is 15MeV/nucleon. Ion uniformity for these experiments was between 88% and 93%.

Figure 4-1 shows one of the three THVD9491-SEP test board used for experiments at the Texas A&M University (TAMU) Cyclotron Radiation Effects Facility. The in-air gap between the device and the ion beam port window was maintained at 40mm for all runs.

Figure 4-1 THVD9491-SEP Evaluation Board at the TAMU K500 Cyclotron Facility