4 Irradiation Facility and Setup

The heavy-ion species used for the SEE studies on this product were provided and delivered by Texas A&M University (TAMU) Cyclotron Radiation Effects Facility using a K500 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 these studies, ion flux of 1 × 10⁵ to 1 × 10⁶ ions/cm² × s was used to provide heavy-ion fluences of 1 × 10⁵– 1.5 × 10⁷ ions/cm². The TAMU facility uses a beam port that has a 1-mil 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 was maintained at 40mm for all runs.

For the experiments conducted on this report, there were four ions used, ¹⁰⁹Ag, ⁸⁴Kr, ⁴⁰Ar and ²⁰Ne. ¹⁰⁹Ag was used to obtain LET_EFF of 47.5MeVcm²/mg. ⁸⁴Kr was used to obtain LET_EFF of 44.12 and 30.79MeVcm²/mg. ⁴⁰Ar was used to obtain LET_EFF of 12.39 and 8.68MeVcm²/mg. ²⁰Ne was used to obtain LET_EFF of 2.79MeVcm²/mg. The total kinetic energy for each of the ions were:

• ¹⁰⁹Ag = 1.634GeV (15MeV/nucleon)
  • Ion uniformity for these experiments was between 93% and 96%
• ⁸⁴Kr = 1.259GeV (15MeV/nucleon)
  • Ion uniformity for these experiments was between 93% and 96%
• ⁴⁰Ar = 599MeV (15MeV/nucleon)
  • Ion uniformity for these experiments was between 93% and 96%
• ²⁰Ne= 300MeV (15MeV/nucleon)
  • Ion uniformity for these experiments was between 93% and 96%

Figure 4-1 shows the CDCLVP111-SEP in front of the beam line at the TAMU facility.

Figure 4-1 CDCLVP111-SEP EVM in Front of the Heavy-Ion Beam Exit Port at the Texas A&M Cyclotron