4 Irradiation Facility and Setup

The heavy-ion species used for the SEE studies on this product are 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 the bulk of these studies, ion flux of 10⁵ ions/cm²·s is used to provide heavy-ion fluences of 10⁷ ions/cm². The TAMU facility uses a beam port that has a 1mil Aramica window to allow in-air testing while maintaining the vacuum within the particle accelerator. The in-air gap between the device and the ion beam port window is maintained at 40mm for all runs.

For these experiments Silver (¹⁰⁹Ag), Krypton (⁸⁴Kr), Copper (⁶³Cu), Argon (⁴⁰Ar), Neon (²⁰Ne) and Nitrogen (¹⁴N) are used. The angle is held to 0°, but different distances between the device and beam are used to increment the LET_EFF. Ion beam uniformity for all tests is in the range of 92 to 97%.

Figure 4-1 shows the OPA4H838-SEP device under test (DUT) in the AMP-PDK-EVM used for data collection 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.

Figure 4-1 Photograph of the OPA4H838-SEP EVM in Front of the Heavy-Ion Beam Exit Port at the Texas A&M Cyclotron

Figure 4-2 Photograph of the OPA4H838-SEP EVM Thermal Image for SEL