J. Stefan Institute, Ljubljana http://www-f9.ijs.si 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 facilit ies : •TRIGA MarkIII reactor •Tandem 2 MeV Peter Križan, UL+JSI
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J. Stefan Institute, Ljubljana Institute: Multidisciplinary institute, largest research institution in Slovenia Physics (solid state,
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J. Stefan Institute, Ljubljanahttp://www-f9.ijs.si
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
• 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
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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
HERA-B RICH
100 m3 of C4F10 ~1 ton of gas
HERA-B RICH Little noise, ~30 photons per ring
Typical event
Worked very well!
Kaon efficiency and pion, proton fake probability
KK
pKK
Belle PID upgrade R+D
Two new particle ID devices, both RICHes:
Barrel: TOP – a special kind of DIRC
Endcap: proximity focusing RICH
stack two tiles with different refractive indices: “focusing” configuration
How to increase the number of photons without degrading the resolution?
normal
Radiator with multiple refractive indices
n1< n2
focusing radiator
n1= n2
4cm aerogel single index
2+2cm aerogel
Focusing configuration – data
NIM A548 (2005) 383
JSI is looking forward to the collaboration
within the MC-PAD project
Physics Panel, 17/06/2008
Experimental Paricle Physics 15
Highlights - Direct CP Violation
Belle, Nature 452, 332 (2008)
Difference between B and B decays CP violation known; magnitude too small