antimatter (e+, ps, h-bar) physics laboratory
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Antimatter (e+, Ps, H-bar) physics Laboratory
Lea Di NotoDepartment of Physics –University of Trento
INFN
Research groupRoberto S. BrusaS. Mariazzi ( assegnista cof. INFN)L. Di Noto (PhD)L. Penasa (tecnico l)M. Bettonte (tecnico nl)
Giancarlo Nebbia (INFN)
G. Ferrari (CNR)
e+ - Ps
detectors
laser
AEgIS (antimatter experiment :gravity interferometry
spectroscopy)apple
earth earth
anti-apple
g g ?
Goals:• Measurement of g on anti-hydrogen• Anti-hydrogen spectroscopy
Methods:– Produce an Hbar beam– Moirè deflectometer
Motivations:• verify the Weak equivalence principle (WEP) • Verify the CPT
antimatter disappearance
p
5 T - 4K trap
MoirèDeflectometer
Positron source
Positron accumulator
Transfer line
1 T - 100 mK Anti-hydrogen
production
AD S
IDE
4/31
activities of Trento group
1 3 2e+ beam Ps spectroscopy Ps cooling & converter
AEgIS experiment in short
Antiprotons 100 mK
2 ns bunch 108 positronis (1 mm in diameter)
Positron-cooled positronium converter
Moirèdeflectometer
Anti hydrogen beam Stark acceleration
Lasers for Ps excitation in Rydberg states
agT
adx 2
1. Pulsed positron beam
2. Positronium cooling & converter
Ps
Positronium converter
Positron beam
Ps
Ps
Vacuum
Ps
Ps
0 5 10 15 20 25 30
10
100
b)
Ps
tem
pera
ture
[K]
Side a [nm]
0,0
2,0x103
4,0x103
6,0x103
8,0x103
a)
222
332
an
mkE
kT m
BB
Mariazzi S, Salemi A and Brusa R S 2008 Phys. Rev. B 78 085428
2 channeltrons
target position
5 NaI scintillators
Trento TOF ApparatusBEAMPrompt peak 16 ns
zo
Mariazzi S, Salemi A and Brusa R S 2008 Phys. Rev. B 78 085428
Ps cooling – first result of Ps cooling
Mariazzi , Bettotti, Brusa, 2010 Phys. Rev. Lett. 104 243401
0.0 0.1 0.2 0.3
T=1515±15K
T=305±10K
T=1425±25K
T=195±10K
T=1260±15K
T=145±10K
7 KeV, T = 300 K 7 KeV, T = 200 K 7 KeV, T = 150 K
log(
dN/d
E) [a
rbitr
ary
units
]
o-Ps kinetic energy [eV]
Permanence time of Ps in nano-channels before escaping into vacuum
<tm> = <tp> + <tf>
tf
tp
z0
Ps energy spectra
tp = 18 ns
Tunable nanochannels will allow to study:
Cooling and thermalization at temperature < 150 K
Cooling and thermalization in presence of decorated surfaces
Relations between diffusion and tortuosity
with the TOF apparatus at the intense positron source
NEPOMUC at the FRMII reactor
p
5 T - 4K trap
MoirèDeflectometer
Positron source
Positron accumulator
Transfer line
1 T - 100 mK Anti-hydrogen
production
AD S
IDE
12/31
3Ps spectroscopy
3. Ps spectroscopy
Our simulation to transport positron bunch from accumulator to the target with duration of 5 ns and a spot of 3 mm diameter !
Buncher
Magnetic field terminator
Valve
sample Detector ports
Three tilted flange
3 Tilted CF16 Flange 45°
FIRST GOAL:
• Study of production efficiency of Ps in Rydberg state
OTHER GOAL:• Rydberg state in presence of magnetic field• Motional stark effect• Ps laser cooling• Jump between different levels (microwave)
METHOD:
• Ps production and detection by PbF2 scintillator• Excitation up to n=3 • Excitation from n=3 to n>15
n=3
continuum
n=1
6.05 eV205 nm
high n~0.75 eV~1650 nm
Planned experiments with Ps chamber
Our work is about:
• Running AEgIS positron bunched beam
• Ps production in AEgIS• Foundamental studies on Ps cooling (TOF at FRMII-Munich)
• Development of a new apparatus for Ps spectroscopy measurements
Summary
Preventivo 2013
• Missioni interne 3 k€ • Missioni estere 22 k€ + 8 k€ (sub
iudice)•Materiale di consumo 4 k€ per materiale da
vuoto•Impianti attrezzature 0•Altre immobilizzazioni 22 k€
-8 k€ per 5 switch -12 k€ per gruppo pompaggio (Turbo, scroll, ionica) -2 k€ per valvola
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