Alla scoperta della realtà: le nuove frontiere di Fisica e tecnologia al CERN. Lucio Rossi CERN High Luminosity LHC Project Leader
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1 Alla scoperta della realtà: le nuove frontiere di Fisica e tecnologia al CERN 30 Ottobre 2014, Liceo Scientifico G. Galilei TRIESTE Lucio Rossi CERN High Luminosity LHC Project Leader
2 L inizio: Padova, Genn «cose mai viste prima»
3 Poi: Manchester la nuova frontiera: l atomo Rutherford (a destra) e Geiger nel laboratorio dell Università di Manchester
4 Particle physics looks at matter in its smallest dimensions Why accelerators? To investigate Particle Physics Accelerators Microscopes Binoculars Optical, radio télescopes Accelerators are the finest microscopes: acto-scope or zepto-scope = h/p T = 1 TeV m Lucio Rossi Padova 4
5 AcceleratorI: macchine del tempo Viaggio indietro nel tempo t s 1/E 2 Gev T 1 ps per creazione di particelle singole T 1 s per fenomeni collettivi QGS (Quark-Gluon Soup) In ogni caso poi rimane il compito di spiegare come si arriva alla complessità che si sviluppa nei 13,7 miliardi di anni che seguono... Molto più difficile! Lucio Rossi Padova 5
6 Opposite extremes in the space Big Bang scale converge in time! Protone Atomo Raggio della Terra Distanze Terra Sole Radius of galaxies LHC Universe Actoscope We were sure that the atom was something solid, then the nucleous came, then Hubble WMAP VLT ALMA
7 The SM: the superb construction of the last 40 years Leptons Quarks u up d down e electron n e e-neutrino c charm s strange muon n -neutrino t top b bottom t tau n t t-neutrino g gluon g photon W W boson Z Z boson Particles and Forces Each with its own antiparticle Brian Foster Higgs Boson? Lucio Rossi Padova 7
8 What remains to be done? The Standard Model is a very good description of the Universe at the particle scale (~2M W ) But does not explain many things Why so many particles? Why so many forces? What is mass? Why do particles have the masses they have? How do neutrinos get mass? Are neutrinos different? How do they fit in? What is Dark Matter? Dark Energy? Why is matter different from antimatter? (Where did all the antimatter go?) Lucio Rossi Padova 8
9 mass energy of the universe
10 Methods of Particle Physics 1) Concentrate energy on particles (accelerator) 2) Collide particles (recreate conditions after Big Bang) 3) Identify created particles in Detector (search for new clues) Both demand edge technology : superconductivity and many others Lucio Rossi Padova 10
11 Accelerators Vac RF cavity Bend - Focus
12 CERN accelerator chain Tradition matters For scintific knowledge From LINAC, through synchrotrons, to the LHC H?? 2004: The 20 member states Lucio Rossi Padova 12
13 LHC: the giant and its large «eyes» LHCb CMS ATLAS Exploration of a new energy frontier in p-p and Pb-Pb collisions ALICE Largest magnetic system (15 GJ) Four gigantic underground caverns to host huge detectors The highest energy accelearator At a temperature colder than outer space LHC ring: 27 km circumference Lucio Rossi Padova 13
14 The LHC: what it will look like The Large Hadron Collider (LHC) will be the most powerful instrument ever built to investigate particles properties. Four gigantic underground caverns to host the huge detectors The highest energy of any accelerator in the world The most intense beams of colliding particles It will operate at a temperature colder than outer space Lucio Rossi Padova 14
15 Superconductivity An enabling technology The LHC has a circumference of 26.7 km, out of which some 20 km of main superconducting magnets operating at 8.3 T. Cryogenics will consume about 40 MW electrical power from the grid. If the LHC were not superconducting: If it used resistive magnets operating at 1.8 T (limited by iron saturation), the circumference would have to be about 100 km, and the electrical consumption 900 MW (a good-size nuclear power plant), leading to prohibitive capital and operation costs. Lucio Rossi Padova 15
16 LHC tunnel 2002
17 Lucio Rossi Padova 17
18 LHC : la supermacchina
19 Barrel Toroid magnet system Lucio Rossi Padova 19
20 10 september 2008:The success!
21 19 settember 2008: The big trouble
22 Electrical connection in detail Articolo su November Lucio Rossi Padova 22
23 LHC: The restart first events
24 An experiment similar to the one carried out by Rutherford exactly Search based on ratio of jet pairs (leading dijets) 100 years earlier I quarks SONO VERAMENTE ELEMENTARI? R Dijets Dijets The observed limit is L < 4.0 TeV at the 95% CL Probing sizes < cm Lucio Rossi Padova 24
25 Hints indicating a possibility December 2011: 99% probability Higgs 2 Z 4
26 The Higgs: the needle in a haystack Z μμ Z μμ event from 2012 data with 25 reconstructed vertices
27 4 July 2012 : Boson got!
28 Brout Englert Higgs mechanism 2013 Nobel Prize for the theoretical discovery of a mechanism that contributes to our understanding of the origin of mass of subatomic particles, and which recently was confirmed through the discovery of the predicted fundamental particle, by the ATLAS and CMS experiments at CERN's Large Hadron Collider
29 Lucio Rossi Padova 29
30 but that s only the beginning! What s next? Measure the properties of the new particle with high precision Lucio Rossi Padova 30
31 29 Otrobre 2014 Trierste 31
32
33 km tunnel in Geneva area: FCC 16 T 100 TeV in 100 km 20 T 100 TeV in 80 km even better 100 km? 29 Otrobre 2014 Trierste 33
34 The web: shows that truth is valuable! 1989 WEB is born at CERN 2009 the celebration Tim Berners-Lee Robert Cailliau Lucio Rossi Padova 34
35 After the Web: GRID LHC computing GRID will be the future generation of informatic infrastructure to provide a computing and analysis power ever attained. Ballon (30 Km) Pile de CD contenant une année de donn du LHC! (~ 20 Concorde (15 Km) Mt. Blanc (4.8 Km)
36 Medical application: PET Prima immagine PET CERN, circa 1975
37 Medical application: magnetic resonance imaging (mri)
38 Oncologic Hadrontherapy: CNAO in Pavia (italy)
39 Medical application: Hadroterapy for cancer treat.
40 ITER: the energy of the stars Central Solenoid Cryostat Toroidal Field Coil Vacuum Vesse Poloidal Field Coil Blanket Port Plug Major plasma radius 6.2 m Plasma Volume: 840 m 3 Plasma Current: 15 MA Typical Density: m -3 Typical Temperature: 20 kev Fusion Power: 500 MW Machine mass: t (cryostat + VV + magnets) - shielding, divertor and manifolds: 7945 t port plugs - magnet systems: t; cryostat: 820 t Torus Cryopum Divertor
41 Power Transmission: 5-15 GW line goal Lucio Rossi Padova 41
42 Refining candles would not have led candle into electric bulbs 29 Otrobre 2014 Trierste 42
43 L importanza del maestro Il tramandarsi una tradizione tiene viva la domanda grandi scuole di fisica Assicura, aiuta, che l esperienza sia un cammino verso una certezza piu grande con un metodo che è quello di tutte le realtà umane positive: Verifica onesta: esperienza Dedizione, affezione Capacità di lavorare insieme Confronto tra l esperienza e l ipotesi Condivisione risultati: da questo la domanda si alimenta Lucio Rossi Padova 43
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