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 × 10? to 1 × 10? ions/cm2 × s was used to provide heavy-ion fluences of 1 × 10?– 1.5 × 10? 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, 1??Ag, ??Kr, ??Ar and 2?Ne. 1??Ag was used to obtain LET_EFF of 47.5MeVcm2/mg. ??Kr was used to obtain LET_EFF of 44.12 and 30.79MeVcm2/mg. ??Ar was used to obtain LET_EFF of 12.39 and 8.68MeVcm2/mg. 2?Ne was used to obtain LET_EFF of 2.79MeVcm2/mg. The total kinetic energy for each of the ions were:

• 1??Ag = 1.634GeV (15MeV/nucleon)
  • Ion uniformity for these experiments was between 93% and 96%
• ??Kr = 1.259GeV (15MeV/nucleon)
  • Ion uniformity for these experiments was between 93% and 96%
• ??Ar = 599MeV (15MeV/nucleon)
  • Ion uniformity for these experiments was between 93% and 96%
• 2?Ne= 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