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, the 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 de-focusing. The flux of the beam is regulated over a broad range spanning several orders of magnitude. For this characterization, ion flux of 10² ions / cm²× s to 10⁵ ions / cm²× s were used to provide heavy-ion fluences of up to 10⁷ ions / cm² for our runs. Ion uniformity for these experiments was between 94 and 98%. See Table 8-1 for more details on the ions used and results of the runs.

Figure 4-1 shows the 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. A 40mm in-air gap between the device and the ion beam port window was maintained at these distances for all runs respective to the ion that was tested.