page_title: Laboratori Nazionali di Frascati
section_title: History and activity
hierarchical_section_title: Laboratori Nazionali di Frascati / History and activity
caption_attribution_description: English: Panoramica della sala del collisionatore e+e- DAFNE dei Laboratori Nazionali di Frascati dell'INFN Italiano: Overview of the hall of the e + e- collider DAFNE at the Frascati National Laboratory of INFN
context_page_description: The INFN National Laboratory of Frascati was founded in 1954 with the objective of furthering particle physics research, and more specifically to host the 1.1 GeV electrosynchrotron, the first accelerator ever built in Italy. The Laboratory later developed the first ever electron-positron collider: from the first prototype AdA, which demonstrated the feasibility, to the ring ADONE and later on to DAΦNE, still operative today. LNF was also the proposed site of the cancelled particle accelerator SuperB.
  Besides conducting experiments with their own facilities, the LNF researchers are also taking part in extensive collaborations at external laboratories, especially at CERN and in the United States.
  It is located in Frascati, Italy.
context_section_description: The INFN National Laboratory of Frascati was founded in 1954 to host an electron synchrotron of 1.1 GeV. The Electron Synchrotron (as the device was called; it was also known as the Electron Synchroton of Frascati, "elettrosincrotrone di Frascati"), built under the lead of Prof. Giorgio Salvini started working in 1959, generating gamma-ray bundles (even polarized) of energy 0.4-1.1 GeV and electron beams in the experiments led by INFN researchers in collaboration with a number of Italian Universities. The device was a 9 meter diameter ring consisting of 4 bending magnets and 4 short straight sections.
  During a seminar in 1960, Bruno Touschek proposed the idea of injecting in the same ring beams of electrons and positrons, circulating in opposite directions, to study their collisions. Hence, AdA (Anello di Accumulazione) was built, within a 1.5 m diameter electro-magnet where the radiofrequency field would accelerate the beams up to 250 MeV (center-of-mass energy 500 Mev).
  AdA was later moved to the Laboratory of Orsay, Paris, which had a more powerful injector; here the first electron-positron collisions were detected.
  AdA’s success led to the design of a more powerful machine: ADONE, with 4 experimental zones and energy of beams being 1.5 GeV (center-of-mass energy 3 GeV). ADONE started operating in 1969 and was permanently turned off in 1993. ADONE’s experiments revolved around quantum electrodynamics (QED) tests, proton and neutron form factors, muon study and multihadron production. That last one in particular, more abundant than anticipated, represented an important validation of the quark model and the color hypothesis.
  In November 1974, within two days after the SLAC and BNL announcement, the LNF second generation experiments observed the J/ψ particle. In order to produce the J/ψ it was necessary to operate ADONE at about 100 MeV above its maximum nominal energy; that was the reason why the J/ψ hadn’t been found before by LNF experiments.
  In 2002, in the same hall as ADONE, the latest machine, DAΦNE, entered in function. It had been designed to operate at Φ resonance, with incredibly intense beams, to search the CP violation in K neutral mesons (KLOE experiment). Many of the other DAΦNE experiments concerned the production of hypernuclei (FINUDA) and the study of kaonic atoms (DEAR, SIDDHARTA).
  Derived from the electron beam of the DAΦNE Linac, particle beams of different kinds – electrons, positrons, photons and neutrons – are available at the BTF (Beam Test Facility) laboratory. The users of this infrastructure are Italian and foreign researchers who come for testing and calibrating detectors for use in high-energy physics experiments. Recently the BTF has been upgraded with the construction of a second beam line: line number 1 is, from 2018, exclusively dedicated to the PADME experiment, to investigate dark matter, while for the test activities line number 2 has been realized.
  At the same time some of the LNF researchers took part in important foreign experiments: at CERN, in US laboratories (Fermilab, SLAC, Jefferson Lab), in Hamburg and recently even in Beijing and Japan.
  At the moment the LNF participation in the experiments ATLAS, CMS, ALICE, and LHCb at the CERN LHC collider is especially relevant. Also important has been the role of the LNF in the experiments at the Laboratories of Gran Sasso: in particular, the recent experiment OPERA, with the neutrino beam produced at CERN.
  At LNF, thanks to the presence of high technology support services, the experimental activity also takes on the design and development of detectors meant to be employed both at the local experiments and the external ones.
  An example for this is the cryogenic antenna Nautilus, devoted to the search for gravitational waves, involved in Albert Einstein’s general relativity theory.
  At the LNF a group of theoretical physicists is also operative. These researchers, in addition to leading independent research, offer guidance and expert advice to the experimental groups.
  The design, building and work on the various LNF accelerators entailed
caption: Overview of the DAΦNE hall.
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