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Irradiation Study of Single Crystal Diamond Sensors for the PLT

Irradiation Study of Single Crystal Diamond Sensors for the PLT. Irradiation of sensors at the PS 1.5 years ago Comparison to RD42 irradiated poly and single Re-measured ( for a much longer time )  improved CD Upcoming irradiation plan.

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Irradiation Study of Single Crystal Diamond Sensors for the PLT

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  1. Irradiation Study of Single Crystal Diamond Sensors for the PLT • Irradiation of sensors at the PS 1.5 years ago • Comparison to RD42 irradiated poly and single • Re-measured (for a much longer time)  improved CD • Upcoming irradiation plan R. Stone--Rutgers RD42 meeting 6-Mar-2009

  2. Proton Irradiation Jul-07 • Irradiated with 24 GeV protons at CERN PS • Contacts were removed prior to irradiation for more rapid cool down • 2 diamonds tested for each fluence listed: • For the lifetime of LHC expect: 2.5 x 1015 p/cm2 (P. Bhat) • Above results are more pessimistic than those from RD42 • Note: the dark current after irradiation is < 10pA

  3. Single Crystal Diamond Before and After 1.5 X 1015 p/cm2 Irradiation Before irradiation After Irradiation Pixel thresh Events Signal ( e- ) Signal ( e- ) Pedestal events

  4. CVD Diamond CD vs Proton Fluence RD42 Poly Relative CD RD42 Single PLT old data Fluence (x1015p/cm2)

  5. Test of Irradiated Diamond With Fast Electronics • Used BCM_1F frontend electronics (25 ns) instead of standard characterization stand electronics (200 ns) to check if charge collection is slower due to irradiation • Re-tested one of the diamonds that received 1.5 x 1015p/cm2 • After calibration, measured collected charge to be <10% lower than slower electronics measurements, but within calibration error and other systematic effects • Also looked at width of signal pulse: • If some charge is collected later than 25 ns, pulse will be wider than unirradiated diamond or calibration signal • No widening was observed on scope pulse (within ~5%)

  6. Re-measurement of Irradiated Samples • One benefit of Fast Amp measurement was a hint at more charge • appearing during a much longer measurement period. • Can see many rapid jump increases in signal (next plot) • Have look so far at 2 out of the 4 irradiated diamonds • Expect to see the same effect in the other 2 (starting this month)

  7. CD vs Time for Irradiated (1.5 x1015p/cm2) Sample CD  500 V | 600V | 1KV | 500V Time (minutes)

  8. CVD Diamond CD vs Proton Fluence RD42 Poly Relative CD RD42 Single PLT old data PLT new data Fluence (x1015p/cm2)

  9. Next • Re-measure other 2 irradiated diamonds, however: • They are currently being repolished to remove surface junk • Send off our 2 re-measured samples for surface cleaning and measure again. • Try using our stronger source for faster (<< 1 week) ‘pumping’ • New Irradiation at the PS this summer (Aug-Sep): • 8 new samples + 3 pixel planes (bumpbonded ROC+diamond): • Fluences (x1015p/cm2) : 4@ 0.5, 2@ 1.0, 4@ 2.0, 2@ 4.0

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