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SeminarIndustriali 2018 – THz per Applicazioni Scientifiche e Trasferimento Tecnologico

L’INFN e i Laboratori Nazionali di Frascati portano avanti una intensa attività di ricerca tecnologica i cui prodotti, oltre che nella ricerca fondamentale, trovano applicazione in diversi campi di interesse sia sociale che industriale. In questo ciclo di seminari, dedicati ognuno a tecnologie e infrastrutture di interesse per un determinato settore, i LNF vogliono continuare il dialogo aperto con altri Enti, Università, Istituzioni ed Imprese in occasione dell’Open Day Imprese a Giugno 2017. Calendario Seminari 2018 Tecnologie per i Beni culturali: infrastrutture e servizi INFN per il Trasferimento Tecnologico – 8 Febbraio 2018 THz per Applicazioni Scientifiche e Trasferimento Tecnologico – 10 Aprile 2018 !CHAOS: un nuovo framework versatile e scalabile per il controllo e l'acquisizione dati di impianti e reti di dispositivi – 18 Giugno 2018 LNF e le tecnologie per lo Spazio: Laboratori di test e calibrazione – Ottobre 2018 Le tecnologie di magneti e vuoto: infrastrutture e servizi – Dicembre 2018

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Very low Emittance Muon Beam using positron beam on target

Muon beams are customarily obtained via K/π decays produced in proton interaction on target. We are proposing a new scheme to produce very low emittance muon beams using a positron beam of about 45 GeV interacting on electrons on target. This is a challenging and innovative scheme that needs a full design study. One of the innovative topics to be investigated is the behaviour of the positron beam stored in a low emittance ring with a thin target, that is directly inserted in the ring chamber to produce muons. Muons will be immediately collected at the exit of the target and transported to two mu+ and mu- accumulator rings. We present the main features of this scheme with an outline of the possible applications for a Multi-TeV collider.

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High gradient ultra-high brightness RF photoinjector optimization

Most of the accelerator applications demand an high beam quality: ultra low energy spread and ultra high beam brightness i.e. bunches with high peak current and ultra low emittance. These quality parameters are also necessary to perform a good matching between beams from a conventional accelerator and a plasma one in the so called external injection scheme. Beam brightness is a fundamental parameter for applications as the Free Electron Laser (FEL), where the gain length is inversely proportional to the electron beam brightness in the Self Amplified Spontaneous Emission (SASE) X-ray regime. These requests in the quality electron beam means that a perfect control of bunches along the beam line is necessary, starting from the bunch generation up to the accelerator end, especially in the photoinjector region where the beam is not yet relativistic and is in the so called space charge regime. From these requests an optimal transport has to be found i.e. an optimization of some parameters and distances has to be fixed: laser on cathode parameters a proper position for the first accelerating section, an integrated magnetic field of the gun solenoid and an optimal bunch compression scheme. To match these stringent beam quality parameter requests, I optimized the beam dynamics for a new ultra high gradient 1.6 cells C-band (5.712 GHz) gun able to reach 240 MV/m as a peak field. By means of the ultra high gradient a better control of the space charge forces inside the bunch is possible. After optimizations on this electron ...

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KLOE-2 data-taking closing ceremony

All people involved in KLOE-2 activities, the DAFNE team,  former KLOE members, and LNF personnel are cordially invited to join the KLOE-2 data-taking closing ceremony   that will take place on March 30th at 11:00 in the Bruno Touschek Auditorium   PLEASE ACKNOWLEDGE YOUR PARTICIPATION BY REGISTERING TO THE EVENT!

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About Dark Matter scenarios in Composite Higgs Models and how to probe them

Non-minimal Composite Higgs Models feature additional scalars which can play the role of a dark matter candidate. These models are very predictive, since the requirement of the correct relic density bounds the new resonance mass from above. I will show that nearly the whole parameter space for such scenarios can be probed at future colliders and dark matter detection experiments.

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RF design of high gradient accelerating structures for high brightness electron linacs

In the framework of the upgrade of the SPARC_LAB facility at INFN-LNF, named EuPRAXIA@SPARC_LAB, a high gradient linac is foreseen. One of the most suitable options is to realize it in X-band. The EuPRAXIA@SPARC_LAB linac layout is based on an S-band Gun, three S-band TW structures and an X-band booster with a bunch compressor. In this presentation it is illustrated the preliminary RF design of the X-band booster. It is based on 0.5 m long traveling wave accelerating structures operating in the 2π/3 mode and fed by klystrons and pulse compressor systems.The design has been driven by the need of a high accelerating gradient required to achieve a high facility compactness, which is one of the main goals of the EuPRAXIA project. The single cell parameters have been calculated by electromagnetic simulations and, on the basis of these results, the accelerating structure length and geometry have been optimized by numerical studies. Finally, the basic RF power distribution layout has been designed.

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The usefulness of useless science

If the scientific results financed by taxpayer money are “public goods”, is it useful or even ethical to spend billions Euros/$ to search for an elementary particle? Or to visit a Jupiter satellite and look for water on Mars? Or to observe a galaxy ad the edge of the Universe? In other words, is it useful to fund basic research? And if so, with what resources and to do what kind of science? Competition has become one of the major driving forces for research. But are we sure that the competition-driven science model is truly the best one to make useful science? More, is the very concept of knowledge changing today? The scientific method introduced by Galileo more that 400 years ago resisted at least three industrial revolutions. Are we sure is it still valid and applicable today, in the midst of the fourth industrial revolution? The answers to all these questions are not obvious, on the contrary, they can contain many surprises not all pleasant or reassuring, answers among which we will try to orient ourselves using an unconventional point of view.

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Gas detectors: general principles

Calorimetry in high-energy physics is rapidly evolving, with new specifications (e.g. higher energies, enormous particle densities) and a wide variety of technologies, both for signal creation and detection. Advances in large-area highly-segmented detectors based on, for example, silicon and scintillators, are providing possibilities for high-granularity calorimetry, providing unprecedented levels of information from particle showers. This talk focuses on one example of high-granularity calorimetry: The CMS HGCAL, being designed to replace the existing endcap calorimeters for the HL-LHC era. It is a sampling calorimeter, featuring unprecedented transverse and longitudinal readout segmentation for both electromagnetic (CE-E) and hadronic (CE-H) compartments. This will facilitate particle-flow calorimetry, where the fine structure of showers can be measured and used to enhance pileup rejection and particle identification, whilst still achieving good energy resolution. The CE-E and a large fraction of CE-H will use silicon as active detector material. The sensors will be of hexagonal shape, maximizing the available 8-inch circular wafer area. The lower-radiation environment will be instrumented with scintillator tiles with on-tile SiPM readout. This concept borrows heavily from designs produced by the CALICE collaboration – calorimetry for ILC etc. – but the challenges of such a detector at a hadron collider are considerably larger than at the ILC. In addition to the hardware aspects, the reconstruction of signals – both online for triggering and offline – is a quantum leap from existing detectors. We present the ideas behind the HGCAL, its current status including design and expected performance, and the challenges ahead.

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