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 the bulk of these studies , ion flux between 10⁴ to 10⁵ ions/cm²·s were used to provide heavy-ion fluences of 10⁶ to 10⁷ ions/cm².

For these experiments Praseodymium (¹⁴¹Pr), Silver (¹⁰⁹Ag), Krypton (⁸⁴Kr), Copper (⁶³Cu), Argon (⁴⁰Ar), and Neon (²⁰Ne) were used. The angle was held to 0°, but different distances between the device and beam were used to increment the LET_EFF. The ¹⁴¹Pr, ¹⁰⁹Ag, ⁸⁴Kr,⁶³Cu ⁴⁰Ar, and ²⁰Ne ions used had a total kinetic energy of 2114MeV, 1634MeV, 1259MeV, 944MeV, 599MeV, and 300MeV in the vacuum, (15MeV/amu line) respectively. Ion beam uniformity for all tests was in the range of 92 to 97%.

Figure 4-1 shows the OPA4H199 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 OPA4H199-SP EVM in Front of the Heavy-Ion Beam Exit Port at the Texas A&M Cyclotron