ISTITUTO NAZIONALE di FISICA NUCLEARE LABORATORI NAZIONALI di FRASCATI
Introduction to the Laboratori Nazionali di Frascati of the Istituto Nazionale di Fisica Nucleare.
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Transcript of Introduction to the Laboratori Nazionali di Frascati of the Istituto Nazionale di Fisica Nucleare.
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Introduction to theIntroduction to theLaboratori Nazionali di FrascatiLaboratori Nazionali di Frascati
of theof theIstituto Nazionale di Fisica NucleareIstituto Nazionale di Fisica Nucleare
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Istituto Nazionale di Fisica NucleareIstituto Nazionale di Fisica Nucleare
The INFN:• promotes, coordinates and performs scientific
research in subnuclear, nuclear and astroparticle physics,
• as well as the research and technological development necessary for activities in these sectors,
• in close collaboration with universities, • and within a framework of international
cooperation
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The origins of the INFNThe origins of the INFN
Enrico Fermi and the “Boys of Via Panisperna” conducted a series of fundamental nuclear physics experiments at the Isitiuto di Fisica at the University of Rome in the 1930s.
Fermi realized that continuing the progress in the field would require costly instruments and technical infrastructure (e.g., accelerators). Fermi (in Rome) and Bruno Rossi (in Florence) sought to establish an “Istituto Nazionale di Fisica” in the 1930s.
Because of the war, this was impossible until Edoardo Amaldi worked to found the INFN in 1951.
D’AgostinoD’AgostinoSegrèSegrè
AmaldiAmaldi
RasettiRasettiFermiFermi
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19514 University Sections
Milan, Turin, Padua, and Rome
1957Laboratori Nazionali di
Frascati
Frascati
The origins of the INFN
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Laboratori del Sud(Catania)
20 Sections 11 Affiliated Groups
4 National Laboratories
INFN oggi
VIRGO-EGO European Gravitational Observatory
Legnaro Gran Sasso
Milano Bicocca
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Fundamental research
• Study the microscopic structure of matter
• Search for gravitational waves
• Develop theoretical models
• Develop and construct particle detectors
• Study and develop accelerating techniques
• Perform material studies and biomedical research with synchrotron light
What do we do at LNF?What do we do at LNF?
• Develop and support computing systems and networks
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The history of the Universe
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The scientific methodThe scientific methodThe modern scientific method was first formally introduced by Galileo
Hypothesis
Prediction
Galileo Galilei 1564-1642
Observation
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John Dalton: Atomic Therory (1805):1.The chemical elements are made of atoms.2.The atoms of an element are identical in mass.3.Atoms of different elements have different masses.4.Atoms combine only in whole-number ratios (1:1, 1:2, 2:3, etc.)5.Atoms can not be created or destroyed.
The modern understanding of matter stems from centuries of inquiry
Ancient Greeks: 4 elements
What is matter made of?What is matter made of?
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In 1869, Mendeleev introduces the periodic table and predicts the existence of elements not yet
discovered
The periodic tableThe periodic table
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The Rutherford atom
Seeing the invisibleSeeing the invisibleIn 1898, Thomson discovered the electron and hypothesized that the electrons are uniformly distributed within the atom, like rasins in rasin bread
-
--
-
--
In 1909-1911, Rutherford and colleagues tested this hypothesis by bombarding a gold foil with alpha particles.
Some scattered at large angles, indicating the presence of a heavy nucleus.
The Thomson atom
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ObservationObservationObserving objects around us is like performing a “Rutherford” experiment
In the microscopic world, the target and beam have similar dimensions
Source
Light
Object
ObserverAccelerator
Particle Beam
Target
Detector
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ObservationObservation
The wavelength of visible light is 400 to 800 nm (i.e., ~10-7 m)
The wavelength of visible light is 400 to 800 nm (i.e., ~10-7 m)
10-10
m
To see atoms (and smaller) we need a smaller probe!To see atoms (and smaller) we need a smaller probe!
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Particle sourcesParticle sourcesRutherford used alpha particles from the decay of radioactive elements. To obtain particle beams of different types and energies, today we construct particle accelerators.
Particle beams start out from a source. The simplest example is electrons emitted by a hot filament, as in a lightbulb.
Particles acquire energy when they are accelerated by an electric field
+ −+
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The Frascati Electron SynchrotronThe Frascati Electron Synchrotron1959-19751959-1975
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Experiments using fixed targetsExperiments using fixed targets
• Matter is mainly empty• All particles which do not interact are lost• Energy is lost in moving the center of mass• “Target” is a nucleus, with a complex structure
synchrotron
LINAC
target
e-,e+,p …p, n, etc
detectors
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A new approach: Use colliding beamsA new approach: Use colliding beams
• The non-interacting particles can be reused in successive rounds
• Collisions are performed in the center-of-mass frame
• The circulating particles can be either elementary or complex (nuclei or atoms)
detector
Accumulation ringBruno Touschek, Frascati, 1960
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ee++ ee--
--
++
A related idea: A related idea: Collide particle and antiparticle Collide particle and antiparticle
++
--
ee--
ee++
E = 2me c2E = 2m c2E = 2m c2
E = m c2
The greater the energy, the higher the number of particles that can be studied
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Matter-antimatter collidersMatter-antimatter colliders
ADA at Frascati in 1959
ADONE at Frascati in 1969 DANE LEP at CERN (Geneva) 1988
LHC at CERN: operating since 2009
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Higgs Higgs bosonboson
For
c e C
arrie
rsF
orc e
Car
riers
Z boson
W boson
photon
ggluon
Matter familiesMatter families
tau
-neutrino
bbottom
ttop
IIIIII
muon
-neutrino
sstrange
ccharm
IIII
eelectron
ee-neutrino
ddown
upu
I I
Lept
onLe
pton
ss Q
uark
sQ
uark
s
GravitGravityy
The The
“Phantom “Phantom of the of the
Opera”Opera”
Fermions Bosons
The Standard Model
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The fundamental forcesThe fundamental forcesForce Intensity
Weak 1029 Weak decays: n p + e +
Electromagnetic 1040 Holds atoms together
Strong 1043 Holds nuclei together
Gravitational 1 Keeps you on your chair
Effect
Z boson
W boson
photon
ggluon
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DAΦNEDAΦNE
FINUDA
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Out of the electron-positron collisions, a ϕ meson can be produced. It decays immediately into two other particles, the K-mesons (kaons). The two kaons can be either neutral or
oppositely charged.
K
K
e
e ee
ee
e
e
e
e
The kaons are used by the experiments (KLOE, FINUDA, etc.)At DAΦNE, up to 10000 kaons per second are produced
e
e
e
e
e
ee
e
Physics at DAΦNEPhysics at DAΦNE
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KK--KK--
pppp
Kaonic hydrogenKaonic hydrogen
n=25n=25
n=2n=2
n=1n=1
2p 2p 1s (K 1s (K))
X ray of interestX ray of interest
In the DEAR experiment, the strong force is investigated by studying kaonic atoms, in which a K substitutes an atomic electron.
Kaonic atomsKaonic atoms (DEAR - Siddharta)
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FINUDAFINUDA(Fisica Nucleare a DAΦNE)
us
K n
du d
du s ud
Reconstruction of a hypernuclear event in the FINUDA detector
p
np nn n
n
nnn
npp
pp
p
pnn
p
np
In the FINUDA experiment, the strong force is studied by placing a “foreign body” inside the nucleus
HypernucleusHypernucleus
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KLOEKLOE(K LOng Experiment)
KLOE studies the differences between matter and antimatter, by looking at kaon (and antikaon) decays
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DADAΦΦNE-LuceNE-Luce
photon
Synchrotron light is the radiation emitted when a charged particle’s path is bent by a magnetic field.
This radiation is very useful for studies in:•Biophysics and medicine•Solid state physics and electronics•Materials science
Synchrotron light is the radiation emitted when a charged particle’s path is bent by a magnetic field.
This radiation is very useful for studies in:•Biophysics and medicine•Solid state physics and electronics•Materials science
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SPARCSPARC
(Sorgente Pulsata Auto-amplificata di Radiazione Coerente) is a project with 4 principal beamlines, aimed at the development of an X-ray source of very high brilliance (energy emitted per unit solid angle)
(Sorgente Pulsata Auto-amplificata di Radiazione Coerente) is a project with 4 principal beamlines, aimed at the development of an X-ray source of very high brilliance (energy emitted per unit solid angle)
Originally a by-product, synchrotron light has become a powerful scientific tool. It is now produced on purpose for various uses
Originally a by-product, synchrotron light has become a powerful scientific tool. It is now produced on purpose for various uses
• 150 MeV Advanced Photo-InjectorProduction of an electron beam and compression by magnetic and radiofrequency systems
• SASE-FEL Visible-VUV ExperimentFor the study of beam-transport systems
• X-ray source
• X-ray monochromator
• 150 MeV Advanced Photo-InjectorProduction of an electron beam and compression by magnetic and radiofrequency systems
• SASE-FEL Visible-VUV ExperimentFor the study of beam-transport systems
• X-ray source
• X-ray monochromator
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Incoherent radiation
Coherent radiation
Coherent, monochromatic waves
Fixed wavelength and fixed relative phase
Equivalent to many, many waves superimposed
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The LI2FE laboratory
FLAME (Frascati Laser for Acceleration and Multidisciplinary Experiments) is an extremely high power laser source (300 TW), with bursts lasting 20 fs and a frequency of 10 Hz.
By combining the SPARC electron beam with the FLAME laser, we produce a unique monochromatic X-ray source.This can be used to produce highquality medical images using less radiation.
LI2FE is an interdisciplinary laboratory inaugurated in Frascati in December 2010.
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The force of gravityThe force of gravity
A distortion in the fabric of spaceA distortion in the fabric of space
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Gravitational waves: an analogyGravitational waves: an analogy
Electromagnetic waves are produced by an electric charge when accelerated
Gravitational waves are produced by masses that undergo acceleration
antenna Hi! How are
you?
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Gravitational wavesGravitational waves
Gravitational waves are 1040 times less intense than electromagnetic waves
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• Supernova in our galaxy h=1018
• Supernova in Virgo h=1021
• Thermal noise @ T=300 K, L=1016 m• Thermal noise @ T=3 K, L=1017 m• Thermal noise @ T=300 mK L=1018 m
Search for gravitational waves:Search for gravitational waves: NAUTILUS NAUTILUS
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GW detectors around the world
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DANE
DANE Upgrade
Reduced horizontal and vertical beam dimensions
Increased horizontal beam-crossingangle:12mrad 25 mrad
The DAΦNE upgrade
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ATLAS
Auditorium
ADA e ADONE
DAFNE
Centro diCalcolo
FISMELBTF
DAFNE-L
FINUDASIDDHARTHA
Laboratori Nazionali di Frascati, info: http://www.lnf.infn.it/sis/eduLaboratori Nazionali di Frascati, info: http://www.lnf.infn.it/sis/edu
KLOE
SPARC
NAUTILUS