Electron Positron Collider DAΦNE
It's a φ-factory consisting of a double ring collider for electrons and positrons with 510 MeV energy per beam. More in detail, a high current linac produces up to 500 mA electron and 100 mA positron beams, feeding them to a ring where they are stacked and damped; from the damping ring they are injected into two identical but separate storage rings. The two rings cross at two interactions points where the experiments are installed. DAΦNE is a multi-bunch accelerator, with 120 bunches/beam, with a peak luminosity of 3×1032 cm­-2-1 and an integrated luminosity of 18 pb-1 /day
  • KLOE experiment has been designed for the study of CP, CPT violation in the neutral kaon system. Its unique feature consists in producing kaon pairs, KS0 KL0 and K+- , in a pure quantum state from the two body φ-decay, thus allowing to get intense, pure, monochromatic and tagged kaon beams. It is composed of two main detectors: a fine sampling lead scintillating fiber calorimeter, EMC, for the energy and time measurement and neutral vertex reconstruction, and a light material cylindrical drift chamber, DC, for high precision and efficient tracking of charged particles. The detector is immersed in a 0.52 T magnetic field provided by a large superconductive coil. The detector is read out by a very high bandwidth data acquisition system. A powerful computing farm, with a large and robotized storage system, is then used for online monitoring, offline data reconstruction, simulation and users analysis.
    A lot of interesting interferometry tests in the KS0 KL0 system is accessible in the experiment thus allowing to test the basic foundations of quantum mechanics, QM. Indeed, in case of similar final state for KS0 and KL0, QM forbids the two kaons to decay at same distance from the interaction point (EPR paradox). Tests of coherence-loss in the time evolution of the KS0-KL0 state, or quantum gravity related effects modifying the initial state definition, can be carried out with large statistical samples.
    The same characteristic allows also to tag in a simple way pure KS0, KL0, K+ and K- beams by identify the other kaon in the opposite direction. In particular DAΦNE is the only source of a pure KS0 beam.
    Last but not least, the radiative φ decays make DAΦNE also a high production source of η, η’, a0(980), f0(980) mesons. For instance, in the η case the tagging is provided by identification of a mono-energetic photon of 363 MeV with an overall production rate of ~ 40 x 106 η/fb-1.
  • SIDDHARTA2 facility optimally combines the unique qualities source of intense, low energy, monochromatic K- beam from the decay of the φ-mesons produced at DAΦNE with the excellent precision X-ray detectors, represented by the new large area triggerable Silicon Drift Detectors (SDD), developed in the framework of the collaboration, to perform an extensive exotic atoms research programme. The SIDDHARTA2 facility is characterized by a unique combination of the triggerable SDD X-rays detectors, highly flexible and stable precision readout electronics, extreme precision (<0.1 %) high and low voltages supplies, and high technology cryogenic and pressurized hydrogen/deuterium targets.
    SIDDHARTA2 experiment continues and enlarges the scientific line initiated by the DEAR experiment on DAΦNE, continued by the SIDDHARTA experiment, of which represents a substantial upgrade,aiming to perform precision measurement of the Kα transition shift and width, in (for the first time) kaonic deuterium. The final goal is to determine both antikaon-nucleon isospin dependent scattering lengths, quantities never measured before. Measuring the antikaon-nucleon scattering lengths with the precision of a few percent will drastically change the present status of low-energy antikaon-nucleon phenomenology and also provide a clear assessment of the SU(3) chiral effective Lagrangian approach to low energy hadron interactions giving so a strong boost to the low-energy kaon-nucleon/nuclei interaction physics.
  • AMADEUS experiment plans to perform the first complete study, in the production and in the decay phases, of the so-called, still much debated, “deeply bound kaonic nuclear states” (DBKNS). AMADEUS plans to implement the KLOE detector in the central region with a high technology pressurized cryogenic target (containing high density gaseous helium 3 and helium 4), a trigger and a tracker systems, taking advantage of the excellent tracking capabilities, full acceptance and very high neutron detection efficiency of the KLOE detector.

The DAΦNE Beam-Test Facility (BTF), operating at the Frascati National Laboratory of INFN (LNF), provides electron or positron beams with tuneable energy from 50 MeV to 750 MeV, while the intensity can be varied from 1010 particles per pulse, down to a single particle per pulse. The pulse width is 1 or 10 ns, with a maximum repetition rate of 50 Hz. Since the end of 2005 a photon tagging system has been designed and built. During 2006 a pulsed dipole magnet has been inserted at the end of the LINAC, allowing to continuously deliver beam in the BTF experimental area also during DAFNE main ring injection.
Webmaster Giuliano Basso - Last updating on 01 January, 2012