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Update on Radiation Tests and Plans by SMU

Update on Radiation Tests and Plans by SMU. SOS LOC1 Fiber VCSELs. Tests on the SOS technology. The proposal to evaluate the 0.25 micron SOS technology for radiation tolerant ASIC development has been approved by ATLAS. Summary of our previous test results: Test chip. Gammas test results.

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Update on Radiation Tests and Plans by SMU

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  1. Update on Radiation Tests and Plans by SMU SOS LOC1 Fiber VCSELs

  2. Tests on the SOS technology • The proposal to evaluate the 0.25 micron SOS technology for radiation tolerant ASIC development has been approved by ATLAS. • Summary of our previous test results: • Test chip. • Gammas test results. • Plan for future tests: • Future tests are contingent on available funding. • Collaboration on data analysis and modeling is needed. Joint ATLAS-CMS Opto-electronics working group, April 10-11, 2008 CERN

  3. Tests on the SOS technology • Summary of our previous test results: • A dedicated test chip with transistors, sift registers, ring oscillators has been designed and fabricated. We still have about 80 such chips. All tests are performed on this test chip. • Transistor I-V curves are measured during gamma (Co-60) irradiation as a function of total dose at different dose rates. • With a grounded substrate, we observe small shifts in threshold voltages, but no noticeable leakage current increase. Joint ATLAS-CMS Opto-electronics working group, April 10-11, 2008 CERN

  4. NMOS Test Chip PMOS Joint ATLAS-CMS Opto-electronics working group, April 10-11, 2008 CERN

  5. Tests on the SOS technology • Plan for future tests: • An ADR proposal (SMU+VU) was sent to DOE for funds to support more tests. • Should this proposal be funded, more tests and modeling work will be carried out. • Tests: gamma, proton and heavy ion. • Modeling: GEANT4+TCAD=MRED from VU. • Modeling work may get help from The Radiation Effects and Reliability Group (http://eecs.vanderbilt.edu/research/rer/), Vanderbilt University, and from CERN. Joint ATLAS-CMS Opto-electronics working group, April 10-11, 2008 CERN

  6. Tests on LOC1 • Lab tests on LOC1 are finished and will be reported in a different talk. • Irradiation test plan for LOC1: • Proton 230 MeV, • Flux 5×105 to 5×1011 p/cm2/sec. 5 to 6 flux steps to cover SEE, TID and NIEL tests. • June/July in Boston, MGH. • Reason for the delay: no manpower to work on preparation for this test beginning of May. Joint ATLAS-CMS Opto-electronics working group, April 10-11, 2008 CERN

  7. Tests on the fiber • Previous test results: • The fiber: Infinicor SX+ 50/250m/1.6mm MM 10G fiber from Corning. Germanium doped. • The tests: Gamma (Co-60) Proton (230 MeV, 1.9×1015 proton/cm2). • The results: Very small light loss at low flux (dose rate). Big loss at high flux but anneals very quickly (within 1 hour) back. • Results are very preliminary. More tests (coordinated by Oxford) are needed. Joint ATLAS-CMS Opto-electronics working group, April 10-11, 2008 CERN

  8. Tests on the fiber • Previous test results: Joint ATLAS-CMS Opto-electronics working group, April 10-11, 2008 CERN

  9. Tests on the fiber • More tests are needed: • Coordinated by Oxford group. • SMU: April 13-17, Gamma (Co-60) test at BNL. • Dose rate: 30 krad/hr. • Measurement stability studies carried out at SMU. Joint ATLAS-CMS Opto-electronics working group, April 10-11, 2008 CERN

  10. Tests on the fiber • Measurement stability at SMU: Joint ATLAS-CMS Opto-electronics working group, April 10-11, 2008 CERN

  11. Tests on the fiber • Measurement stability at SMU: Joint ATLAS-CMS Opto-electronics working group, April 10-11, 2008 CERN

  12. Tests on VCSELs • Two HFE6192-562 (10GHz, LC w/ 50 ohm flex) from Finisar tested . • Irradiated with 230 MeV proton, 1.9×1015 proton/cm2. • The VCSELs are biased during irradiations. • Eye diagram and power are measured before and after irradiation -- see plots and table next page. • More tests are needed, maybe with LOC1 proton tests. • Tests coordinated by KK. Joint ATLAS-CMS Opto-electronics working group, April 10-11, 2008 CERN

  13. Tests on VCSELs L1, before irradiation L1, after irradiation Joint ATLAS-CMS Opto-electronics working group, April 10-11, 2008 CERN

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