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Oklahoma Radiation plans

B. Abi( OSU), R. Boyd (OU), P. Skubic (OU), F. Rizatdinova (OSU). Oklahoma Radiation plans. Oklahoma responsibility. Our goal is to identify radiation hard high speed PiN diodes and VCSELs and measure their lifetime. High speed PiN arrays available on the market are GaAs or InGaAs.

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Oklahoma Radiation plans

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  1. B. Abi( OSU), R. Boyd (OU), P. Skubic (OU), F. Rizatdinova (OSU) Oklahoma Radiation plans

  2. Oklahoma responsibility • Our goal is to identify radiation hard high speed PiN diodes and VCSELs and measure their lifetime. • High speed PiN arrays available on the market are GaAs or InGaAs. • Radiation tests performed by KK in August 2007 have revealed that these devices are not radiation hard.

  3. PiNs to be tested • Contacted Hamamatsu to get the Si PiN diodes. • Got two types of single PiN diodes to test them this spring/summer • S9055-01 • S5973-01 • In case of success have an agreement that Hamamatsu will produce arrays for us. • In addition, have one type of GaAs PiN array to test

  4. VCSELs to test • Want to test following VCSELs • AOC: HFE8012-103 • Truelight: TSA-8B12-000 • ULM:ULM850-10-TT-N0112U • Not sure if there is a need to test them...

  5. Irradiation tests • TID test with gamma rays at BNL together with SMU – started yesterday, will finish tomorrow. • Passive test of PiNs only. • Irradiation dose: 0.15 kGy/h and 0.3 kGy/h. • Measured PiN’s responsivity before irradiation, will measure its current right after irradiation.

  6. Irradiation tests (2) • 230 MeV protons in Boston together with SMU • Want to have total dose of the order of 40 MRad • Plan to test 2 of each type of PiNs and VCSELs • Pre-irradiation tests: IV for PiNs, optical power for VCSELs • Have a simple setup for online test • Plan to monitor PiN’s response and VCSEL’s optical power • PiN’s leakage current • Temperature • Take out 1 of each devices when their responsivity will be at the level of ~30% of the initial – want to perform lifetime test anyway, need alive detectors

  7. Irradiation tests (3) • Participate in KK’s tests with 24 GeV protons at CERN in August • Not sure if there will be a possibility for the online test of PiNs • Passive test of PiNs can be done • Would be interesting to compare results of PiN responsivity after irradiation with low energy and high energy protons.

  8. Lifetime test • After irradiation in June at Boston, plan to start the lifetime test of irradiated PiNs and VCSELs. • Currently have a running test for single channel. Also have ready-to-use setup to test up to 64 channels simultaneously. • Monitor PiNs current and temperature. • For VCSELs will monitor their optical power

  9. Summary • PiN and VCSEL candidates identified • All PiN candidates and 1 VCSEL candidate are at Oklahoma • Still wait for two VCSEL candidates • Expect to have some results on radiation hardness from irradiations with 230 MeV and 24 GeV protons by the end of this year • Full scale TID test – to be determined • Can start lifetime test of irradiated PiNs, VCSELs which will survive an irradiation

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