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Antimatter (e+, Ps, H-bar) physics Laboratory
Lea Di Noto Department of Physics –University of Trento INFN
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Research group e+ - Ps detectors laser Roberto S. Brusa
S. Mariazzi ( assegnista cof. INFN) L. Di Noto (PhD) L. Penasa (tecnico l) M. Bettonte (tecnico nl) e Ps Giancarlo Nebbia (INFN) detectors laser G. Ferrari (CNR)
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(antimatter experiment :gravity interferometry spectroscopy)
AEgIS (antimatter experiment :gravity interferometry spectroscopy) 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
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activities of Trento group
e+ beam Ps spectroscopy Ps cooling & converter 2 1 3 p 5 T - 4K trap Moirè Deflectometer Positron source Positron accumulator Transfer line 1 T mK Anti-hydrogen production AD SIDE /31
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AEgIS experiment in short
Positron-cooled positronium converter 2 ns bunch 108 positronis (1 mm in diameter) Lasers for Ps excitation in Rydberg states Antiprotons 100 mK Anti hydrogen beam Stark acceleration Moirè deflectometer
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1. Pulsed positron beam
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2. Positronium cooling & converter
Ps Positronium converter Positron beam Vacuum Mariazzi S, Salemi A and Brusa R S 2008 Phys. Rev. B
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Trento TOF Apparatus BEAM Prompt peak 16 ns 2 channeltrons
target position 5 NaI scintillators zo
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Ps cooling – first result of Ps cooling
Mariazzi S, Salemi A and Brusa R S 2008 Phys. Rev. B Mariazzi , Bettotti, Brusa, 2010 Phys. Rev. Lett
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Permanence time of Ps in nano-channels before escaping into vacuum
Ps energy spectra z0 tf tp <tm> = <tp> + <tf> tp = 18 ns
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at the intense positron source NEPOMUC at the FRMII reactor
with the TOF apparatus at the intense positron source NEPOMUC at the FRMII reactor 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 It is important to note that the rectangular extension of the Tao-Eldrup model (RTE), considering Ps in equilibrium at the sample temperature of 300 K, would give a lifetime of ns for Ps annihilating in channels with 5-8 nm size. The measured mean Ps annihilation lifetime value seems to point out that a large fraction of Ps annihilate hot also in the closed channels. In this case a different Ps temperature from the thermal should be used in the RTE model. If we use as a first approximation the T= 1100±300 K (average temperature of the found thermal and cooled distributions), the RTE gives a reduced lifetime of 51±8 ns in fairly agreement with the measured one.
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Anti-hydrogen production
3. Ps spectroscopy 3 Ps spectroscopy p 5 T - 4K trap Moirè Deflectometer Positron source Positron accumulator Transfer line 1 T mK Anti-hydrogen production AD SIDE /31
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sample Detector ports Magnetic field terminator Buncher Valve Our simulation to transport positron bunch from accumulator to the target with duration of 5 ns and a spot of 3 mm diameter !
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3 Tilted CF16 Flange 45° Three tilted flange
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Planned experiments with Ps chamber
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 eV 205 nm high n ~0.75 eV ~1650 nm
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Summary 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
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Preventivo 2013 Missioni estere 22 k€ + 8 k€ (sub iudice)
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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