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CERN RD50 Collaboration

CERN RD50 Collaboration. CERN RD50 project: Main objective: Develop radiation hard semiconductor detectors that can operate beyond the limits of present devices for the luminosity upgrade of the LHC (Super-LHC) which will bring 10 times higher radiation levels. Three R&D strategies:

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CERN RD50 Collaboration

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  1. CERN RD50 Collaboration CERN RD50 project: Main objective: Develop radiation hard semiconductor detectors that can operate beyond the limits of present devices for the luminosity upgrade of the LHC (Super-LHC) which will bring 10 times higher radiation levels. Three R&D strategies: • Material engineering- Defect engineering of silicon (oxygenation, dimers, …)- New detector materials (SiC, …) • Device engineering- Improvement of present planar detector structures (3D detectors, thin detectors, cost effective detectors,…) • Variation of detector operational conditions- Low temperature operation- Forward bias operation Further key tasks: • Basic studies • Defect modeling and device simulation RD50Center of gravity Michael Moll – PH-TA1-SDMeeting February 25, 2004 -1-

  2. CERN RD50 Collaboration Involvement of PH-TA1-SD in 2003:Alison (Doctoral Student since September), Christian, Maurice, Michael, Veronique • Direct involvement in the following research projects: • Oxygen dimer enriched silicon (Veronique, Michael) • Czochralski and epitaxial silicon as detector material (Alison, Michael) • Detector design development (Michael + outside collaborators) • Irradiations for RD50, inclucing dedicated high flux run to reach 1016 p/cm2 (Maurice, Michael) • Management of Collaboration: - Michael (CERN contact person and since July Deputy Spokesperson)- Christian (Budget holder and advice in many aspects) • Administration of members (270 Members from 51 Institutes), link to users office, web-pages, computer accounts, etc. • Organization of Workshops in May and November (~80 participants, ~ 35 talks)Since October help from Secretary Dawn Hudson … will continue for workshops in 2004. Changes in 2004: Alison (6 months), Christian, Maurice, Michael,Veronique (until end of April) • Conclude the dimer program, step out of the detector design development • Test of p-type silicon (also Czochralski) as detector material Michael Moll – PH-TA1-SDMeeting February 25, 2004 -2-

  3. Czochralski silicon (CZ) • Very high Oxygen content 1017-1018cm-3 (Grown in quartz (SiO2)crucible) • High resistivity (>1KWcm) available only recently (Magnetic CZ technology) • CZ wafers cheaper than FZ(RF-IC industry got interested) Irradiation of test-structures: • Only small change in Vdep • 1•1015 (190 MeVp)/cm2 • 1•1015 (24 GeV/c p)/cm2 • 5•1014 (10 MeV p)/cm2 • No type inversion (Sumitomo CZ)(However, type inversion observed for Okmetic MCZ after 5•1014 (10 MeV p)/cm2 ) • Leakage current and charge trapping as for FZ silicon • Very high oxygen content: Beware of thermal donors ! 24 GeV/c p Michael Moll – PH-TA1-SDMeeting February 25, 2004 -3-

  4. 11/2003 – First results … not as promising as thought.. Defect Engineering: Oxygen Dimers in Silicon • Idea: Transform Oxygen into Oxygen dimers (O2) Standard Si :V+OVO; V+VO V2O Dimered Si : V+O2VO2; V+VO2 V2O2 deep acceptor (neg. charged) Simulations: deep acceptor (but shallower than V2O) neutral in SCR ? • How to produce silicon containing dimers ? • Co60-g or electron irradiation at 350ºC V+OVO; VO+O VO2; I+VO2 O2 • Does it work ? Michael Moll – PH-TA1-SDMeeting February 25, 2004 -4-

  5. TCT - Measurements Laboratory in Building 28 CV-IV Measurements Details (set-up still under development): • Pelletier cooled sample holder; nitrogen gas flow • Lasers 1060, 660 nm (produced by Maurice) • Voltage source: Keithley2410 • Scope: Agilent Infinium • Pulse: Agilient 81104A • Lab View program • … b source Details: • Alessi probe station • Voltage source/current meter: Keithley237, Keithley2410 • LCR meter: Agilent 4263B • Lab View program Planned improvements: • Automated temperature measurement • …improve flexibility of software Summer StudentAlzbeta Helienek 2003 Visitor Akhil Jhingan 2004 Alison Gouldwell-Bates

  6. … stop … no more than 5 slides !! Michael Moll – PH-TA1-SDMeeting February 25, 2004 -6-

  7. Laboratories in 28-2 Meeting room + RD50 visitors Solid State Detector Laboratory Michael and Veronique Christian Lab now used by Enrico Chesi Lab borrowed to RD39(should be given back to us in very near future) Alison + visitors • air condition (2-019/2-026) • electricity system renovated (2-019/2-026) • water (2-019/2-026) • compressed air (2-019) Michael Moll – PH-TA1-SDMeeting February 25, 2004 -7-

  8. Clean room class 10 in the lab? • less than 6 particles of size > 0.3mm per cubic feet measured • no particles of size > 0.5mm per cubic feet measured Laboratory in Building 28 Deep Freezer Transportable deep freezer Laminar Flow Bench

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