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 [3], using a superconducting cyclotron and advanced electron cyclotron resonance (ECR) ion source. At the fluxes used, ion beams had good flux stability and high-irradiation uniformity over a 1-in diameter circular cross-sectional area for the in-air station. Uniformity is achieved by means of 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 fluxes between 10⁴ and 10⁵ ions/s-cm² were used to provide a heavy-ion fluences between 10⁶ and 10⁷ ions/cm².

For these experiments Holmium (¹⁶⁵Ho), Praseodymium (¹⁴¹Pr), Silver (¹⁰⁸Ag), Krypton (⁸⁴Kr), Copper (⁶³Cu) and Argon (⁴⁰Ar) were used. Angles were used to increment the LET_EFF, details are provided in Section 5. The ¹⁴¹Pr, ⁸⁴Kr and ⁶³Cu ions used had a total kinetic energy of 2114, 1259, and 944 MeV in the vacuum, (15-MeV/amu line) respectively. Ion beam uniformity for all tests was in the range of 88 to 97%.

Figure 4-1 shows the TRF0206-SP mounted on the EVM board in front of the beam exit port, as in the heavy-ion characterization. The beam port has a 1-mil Aramica (Kevlar®), 1-in diameter to allow in-air testing while maintaining the vacuum in the accelerator with only minor ion energy losses. The air space between the DUT and beam exit port the was set to 40 mm.

The data recorded in this report was based on finalized EVM boards with optimized component values that follow data sheet recommendations.

Figure 4-1 TRF0206-SP Evaluation Board Mounted in Front of the Heavy-Ion Beam Exit Port