SLVK280 March   2026 INA1H182-SEP

 

  1.   1
  2.   2
  3.   Trademarks
  4. 1Overview
  5. 2SEE Mechanisms
  6. 3Irradiation Facilities and Telemetry
  7. 4Test Device and Test Board Information
    1. 4.1 Qualification Circuits and Boards
    2. 4.2 Characterization Devices and Test Board Schematics
  8. 5Results
    1. 5.1 SEL Qualification Results: TAMU Cyclotron Radiation Effects Facility
    2. 5.2 SET Characterization Results
    3. 5.3 Analysis
  9. 6Summary
  10.   A Transient Results Appendix
  11.   B References

3 Irradiation Facilities and Telemetry

For SEL qualification and SET characterization testing, heavy ion species were provided and delivered by the TAMU Cyclotron Radiation Effects Facility (3) using a superconducting cyclotron and advanced electron cylotron resonance (ECR) ion source. Ion beams were delivered with high uniformity over a 1-inch diameter circular cross sectional area for the in-air station. Uniformity is achieved by magnetic defocusing. The intensity of the beam is regulated over a broad range spanning several orders of magnitude. These measurements are real-time continuous and establish dosimetry and integrated fluence. An ion flux of 105 ions/s-cm2 was used to provide heavy ion fluences to 107 ions/cm2 for most runs. Ion flux was increased to 1.5 × 107 ions/s-cm2 for some runs, to show SEL immunity at multiple flux rates and to explore the effect of flux rate on transient event counts.

An additional SET characterization test session was performed at the MSU Facility for Rare Isotope Beams(4) (FRIB) using a linear particle accelerator ion source. An ion flux of 105 ions / s-cm2 was used to provide heavy ion fluences to 107 ions/cm2 for these runs.

For MSU SET testing, the FRIB "degrader wheel" was employed to adjust the ion energy. The wheel is positioned between the beam "window" or output, and the device under test. The wheel features multiple slots where a foil degrading element of known thicknesses can be loaded. When the wheel is rotated to an "open" slot, only the 70mm air gap and the copper foil in the LINAC path serve to degrade the ion energy. When the wheel is remotely rotated to a slot with a given aluminum degrading foil thickness, the ions pass through the aluminum foil as well, and are slowed accordingly. The slower rate decreases the effective ion range in silicon but increases the effective Linear Energy Transfer (LETeff) in MeV-cm2/mg, effectively shifting along the Bragg curve. Use of the degrader wheel allows multiple LETeff values to be achieved per beam species and LINAC energy level.