4 Irradiation Facility and Setup

The heavy-ion species used for the SEE studies on this product were provided and delivered by the Texas A&M University (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 the bulk of these studies, ion flux of 10⁴ and 10⁵ ions / cm² × s were used to provide heavy-ion fluences of approximately 3 × 10⁶ and 10⁷ ions / cm².

Figure 3-2 shows the INA901-SP test board used for the experiments at the TAMU facility. Although not visible in this photo, the beam port has a 1mil Aramica window to allow in-air testing while maintaining the vacuum within the accelerator with only minor ion energy loss. All through-hole test points were soldered backwards for access of the signals while having enough room to change the angle of incidence and maintaining the 40mm distance to the die. The in-air gap between the device and the ion beam port window was maintained at 40mm for all runs.