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J. Stefan Institute, Ljubljana

http://www -f9 . ijs.si. Peter Križan, UL+JSI. J. Stefan Institute, Ljubljana. Institute: Multidisciplinary institute, largest research institution in Slovenia Physics (solid state, particle physics, nuclear physics, theory, surface science, reactor physics) Chemistry Biochemistry

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J. Stefan Institute, Ljubljana

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  1. http://www-f9.ijs.si Peter Križan, UL+JSI J. Stefan Institute, Ljubljana • Institute:Multidisciplinary institute, largest research institution in Slovenia • Physics (solid state, particle physics, nuclear physics, theory, surface science, reactor physics) • Chemistry • Biochemistry • Electronics, electrotechnics • Staff: about 1000 • Main facilities: • TRIGA MarkIII reactor • Tandem 2 MeV

  2. JSI: interdisciplinary research is easy – next door lab might have a solution for your troubles Example: High power pulsed laser in the solid state department (80fs pulse width, 10J/pulse)  excellent for Single Event Upset (EPS) tests of read-out electronics for Belle SVD

  3. Particle physics department (F9) Experiments: ATLAS, Belle, AUGER Past: HERA-B, CPLEAR, DELPHI Staff: Researchers: ~20 (including part time professors of the Universities of Ljubljana and Maribor) PhD students: ~10

  4. Research Programme – Snapshot R&D projects • Cryogenic detectors (CERN RD-39) • Diamond detectors (RD-42) • Radiation hard detectors (RD-50) ATLASexperimentatLHCinCERN ~2000 researchers, 167 institutions Belle experimentatKEK-BinKEK ~380 researchers, 55 institutions EU projects • Grid computing (EGEE-I, II, III) • Medical imaging detectors (MADEIRA) • MC training on particle detectors (MCPAD) • RADFET dosimetry (RADOS)

  5. Experimental Paricle Physics Highlights - D0 Meson Mixing ratio (K+K-+p+p-)vs. K-p+ Decays to CP eigenstates difference of effective lifetimes measured in decays to CP (D0→ K+K-, p+p-) and non-CP states (D0→ K-p+) Belle, Phys. Rev. Lett. 98, 211803 (2007) y: one of parameters determining the rate of mixing + precise t measurement first evidence of mixing (30 years after D0 discovery)

  6. Expertise(in experimental methodology) • RICH detectors: DELPHI, HERA-B, Belle upgrade • Si strip detectors: DELPHI, RD20, ATLAS, Belle • Diamond sensors: ATLAS BCM, Belle radiation monitoring • readout/ trigger electronics: HERA-B (RICH, tracker), Belle (SVD, PID upgrade) • Grid computing: CrossGrid (EU project), BalticGrid (EU project), WLCG • Monte Carlo simulations (detector modelling, physics simulations) • Lecturing at the University of Ljubljana (undergraduate and postgraduate courses): particle physics, detector techniques, analysis methods; supervising diploma, MSc and PhD theses.

  7. JSI@ATLAS ATLAS • Members since 1996 • SemiConductor Tracker • Radiation hardness studies and QA (at the reactor center) • Low-mass tapes and thermal enclosure heaters • Beam Conditions Monitor • Radiation monitors • Physics analysis and MC software • Grid computing – TIER-2 centre

  8. Into the Future – R&D for sLHC • sLHC = LHC x 10 in luminosity • Severe radiation damage to tracker • Current tracker needs to be replaced • All-Si tracker envisaged • Si (short) strips at outer radii • Pixels inside • Active in two ATLAS R&D projects • Diamond pixels • n+p strips • Recent striking result • Collected charge from n+p strips independent of fluence if sufficiently high bias applied

  9. HERA-B RICH 100 m3 of C4F10 ~1 ton of gas

  10. HERA-B RICH  Little noise, ~30 photons per ring Typical event  Worked very well! pK pK KK Kaon efficiency and pion, proton fake probability

  11. Belle PID upgrade R+D Two new particle ID devices, both RICHes: Barrel: TOP – a special kind of DIRC Endcap: proximity focusing RICH

  12. Radiator with multiple refractive indices How to increase the number of photonswithout degrading the resolution?  stack two tiles with different refractive indices: “focusing” configuration normal n1= n2 n1< n2 • focusing radiator

  13. Focusing configuration – data 4cm aerogel single index 2+2cm aerogel NIM A548 (2005) 383

  14. JSI is looking forward to the collaboration within the MC-PAD project

  15. Experimental Paricle Physics Highlights - Direct CP Violation Difference between B and B decays CP violation known; magnitude too small to describe matter domination in universe within SM AK+p-≈ AK+p0 Belle, Nature 452, 332 (2008) difficult to explain within SM (especially in combination with other meas.); hint for yet unknown sources of CP violation? ~ one out of 105 B mesons decays to this final states

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