[seminar] Seminari FO, Vidal & Scodro

[hbuljan at phy.hr]

Poštovani kolege,

podsjećam na današnja dva predavanja na FO
s početkom u 14 sati (točno) u sobi F201.
Predviđeno je da svako predavanje traje pola sata,
a nakon seminara pozvani ste na nastavak diskusije u labos
Profesora Bosnara u F301 uz kavu i sokove.

Srdačan pozdrav
Hrvoje Buljan

***************************************************************************Četvrtak,
1. 10. 2009., Seminar 201, 14h

       SIDDARTHA experiment at DAPHNE
  (SIDDARTHA – Silicon Drift Detectors for
Hadronic Atom Research by Timing Application)

     Dr. Antonio  Romero Vidal
Laboratori Nazionali di Frascati, Italy
    ( http://www.lnf.infn.it/ )

The SIDDHARTA experiment plans to continue the successful measurements of
kaonic atoms at DAFNE initiated by DEAR. SIDDHARTA, differently from DEAR,
will use triggered X-ray detectors, namely Silicon Drift Detectors
(developed in the framework of the collaboration) to perform, for the
first time, few eV precision measurements of kaonic hydrogen and kaonic
deuterium transitions. Such measurements are related to yet not-well
understood aspects of the non-perturbative QCD in the strangeness sector.
The SIDDHARTA setup was installed at DAPHNE in late summer 2008; first
results for kaonic helium transitions to the 2p level will be shown,
together with future plans.

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     Trigger system for AMADEUS experiment at DAPHNE
      (AMADEUS -  Antikaon Matter At DAPHNE Experiments
                Unraveling Spectroscopy)

            Alessandro Scordo
    Laboratori Nazionali di Frascati, Italy
        ( http://www.lnf.infn.it/ )

Multi-Pixel Photon Counters (MPPC) consist of hundreds coupled micro
silicon Avalanche Photo-Diodes (APD) working in Geiger mode. The high
gain, low noise and low voltage values needed for operation of these
relatively new devices, together with their good behaviour in magnetic
fields make them ideal for the readout of thin scintillating fibers as
front-end detectors, as the ones that are planned to form the trigger
system of AMADEUS experiment. We present here a response study for
Hamamatsu S10362-11-050U MPPC characterizing properties as gain, dark
noise, linearity, single photo-electron efficiency, etc. A testing set-up
with MPPCs coupled to scintillating fibers for the readout of light
produced by a Sr90 beta source was used. Geant3 simulation and
experimental results for response to the electrons from Sr90 source will
be shown. Response to particles coming from DAPHNE beam will be also
presented.

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