4 results on '"Povolo, L."'
Search Results
2. Development of a Position-Sensitive Detector for Positronium Inertial Sensing Measurements
- Author
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Mariazzi, S., Caravita, R., Glöggler, L., Povolo, L., Penasa, L., Sharma, Sushil, Moskal, Paweł, and Bruda, R. S.
- Subjects
positronium ,antimatter ,General Physics and Astronomy ,spatial-sensitive detector ,Detectors and Experimental Techniques - Abstract
In the last twenty years, both free fall and interferometry/deflectometry experiments have been proposed for the measurement of the gravitational acceleration on positronium, which is a purely leptonic matter-antimatter atom formed by an electron and its antiparticle (positron). Among the several challenges posed by these experiments is the development of position-sensitive detectors to measure the deflection of positronium in the Earth's gravitational field. In this work, we describe our recent progress in the development of position-sensitive detectors. Two different detection schemes are considered. The first is based on Ps ionization in a strong homogeneous magnetic field and imaging of the freed positron with a microchannel plate. The second scheme is based on scanning the positronium atom distribution on a plane by moving the slit or a material grating with sub-nm accuracy, and counting the atoms crossing the obstacle and those annihilating on it. The possibility of reaching a spatial resolution of around 15 μm using the former detection scheme is shown, and preliminary steps towards the development of a detector following the latter scheme (with potential position sensitivity in the sub-nm range) are described.
- Published
- 2022
3. Feasibility studies for imaging [formula omitted] annihilation with modular multi-strip detectors.
- Author
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Sharma, S., Povolo, L., Mariazzi, S., Korcyl, G., Kacprzak, K., Kumar, D., Niedźwiecki, S., Baran, J., Beyene, E., Brusa, R.S., Caravita, R., Chug, N., Coussat, A., Curceanu, C., Czerwinski, E., Dadgar, M., Das, M., Dulski, K., Eliyan, K., and Gajos, A.
- Subjects
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POSITRONIUM , *DIAGNOSTIC imaging , *FEASIBILITY studies , *DETECTORS , *ANTIPARTICLES , *ANTIMATTER - Abstract
Studies based on imaging the annihilation of the electron (e −) and its antiparticle positron (e +) open up several interesting applications in nuclear medicine and fundamental research. The annihilation process involves both the direct conversion of e + e − into photons and the formation of their atomically bound state, the positronium atom (Ps), which can be used as a probe for fundamental studies. With the ability to produce large quantities of Ps, manipulate them in a long-lived Ps states, and image their annihilations after a free fall or after passing through atomic interferometers, this purely leptonic antimatter system can be used to perform inertial sensing studies in view of a direct test of Einstein's equivalence principle. It is envisioned that modular multi-strip detectors can be exploited as potential detection units for this kind of studies. In this work, we report the results of the first feasibility study performed on a e + beamline using two detection modules to evaluate their reconstruction performance and spatial resolution for imaging e + e − annihilations and thus their applicability for gravitational studies of Ps. [ABSTRACT FROM AUTHOR]
- Published
- 2024
- Full Text
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4. Developments for pulsed antihydrogen production towards direct gravitational measurement on antimatter
- Author
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Alberto Rotondi, S. Müller, G. Nebbia, Davide Pagano, O. Khalidova, Massimo Caccia, L. Povolo, Giovanni Consolati, V. Toso, Germano Bonomi, Heidi Sandaker, V. Petráček, A. Hinterberger, L. T. Glöggler, Sebastiano Mariazzi, B. Rienäcker, C. Zimmer, L. Di Noto, Marco Giammarchi, Marco Prevedelli, M. Antonello, Chloé Malbrunot, G. Testera, Angela Gligorova, Ole Røhne, Nicola Zurlo, Sebastian Gerber, Fabrizio Castelli, Alban Kellerbauer, A. S. Belov, I. C. Tietje, D. Krasnicky, V. Lagomarsino, M. Fanì, L. Nowak, Romualdo Santoro, Michael Doser, Patrick Nedelec, E. Oswald, J. Fesel, V. Matveev, S. Haider, P. Cheinet, A. Demetrio, F. Guatieri, Luca Penasa, A. Camper, F. Prelz, Daniel Comparat, Ruggero Caravita, T. Wolz, Markus K. Oberthaler, R. S. Brusa, Rafael Ferragut, Fani M., Antonello M., Belov A., Bonomi G., Brusa R.S., Caccia M., Camper A., Caravita R., Castelli F., Comparat D., Cheinet P., Consolati G., Demetrio A., Di Noto L., Doser M., Ferragut R., Fesel J., Gerber S., Giammarchi M., Gligorova A., Gloggler L.T., Guatieri F., Haider S., Hinterberger A., Kellerbauer A., Khalidova O., Krasnicky D., Lagomarsino V., Malbrunot C., Nowak L., Mariazzi S., Matveev V., Muller S.R., Nebbia G., Nedelec P., Oberthaler M., Oswald E., Pagano D., Penasa L., Petracek V., Povolo L., Prelz F., Prevedelli M., Rienacker B., Rohne O.M., Rotondi A., Sandaker H., Santoro R., Testera G., Tietje I.C., Toso V., Wolz T., Zimmer C., Zurlo N., Laboratoire Aimé Cotton (LAC), Centre National de la Recherche Scientifique (CNRS)-Université Paris-Sud - Paris 11 (UP11)-École normale supérieure - Cachan (ENS Cachan), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), and Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)
- Subjects
Gravity (chemistry) ,Physics::General Physics ,Antimatter ,experimental methods ,Gravity ,Antiproton ,magnetic field ,Positronium ,01 natural sciences ,010305 fluids & plasmas ,Nuclear physics ,Gravitation ,temperature: low ,0103 physical sciences ,general relativity ,[PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex] ,Physics::Atomic and Molecular Clusters ,Physics::Atomic Physics ,010306 general physics ,Antihydrogen ,Mathematical Physics ,Physics ,gravitation: interaction ,antihydrogen: production ,talk: Kolymbari 2019/08/21 ,sensitivity ,charge exchange ,Condensed Matter Physics ,pulsed ,Atomic and Molecular Physics, and Optics ,anti-p ,equivalence principle ,gravitation: acceleration ,gravitation: local ,experimental results - Abstract
International audience; A main scientific goal of the experiment is the direct measurement of the Earth’s local gravitational acceleration g on antihydrogen. The Weak Equivalence Principle is a foundation of General Relativity. It has been extensively tested with ordinary matter but very little is known about the gravitational interaction between matter and antimatter. Antihydrogen is produced in via resonant charge-exchange reaction between cold Rydberg-excited positronium and cooled down antiprotons. The achievements for the development of a pulsed cold antihydrogen source are presented. Large number of antiprotons, necessary for a significant production rate of antihydrogen, are captured, accumulated, compressed and cooled over an extended period of time. Positronium (Ps) is formed through e$^{+}$-Ps conversion in a silica porous target at 10 K temperature in a reflection geometry inside the main apparatus. The so-formed Ps cloud is then laser-excited to Rydberg levels, for the first time in a 1 T magnetic field. Consequently, a detailed characterization of the Ps source for antihydrogen production in magnetic field needed to be performed. Several detection techniques are extensively used to monitor antiproton and positron manipulations in the formation process of antihydrogen inside the main apparatus. Positronium detection techniques underwent extensive improvements in sensitivity during the last antiproton run. At the same time, major efforts to improve integrate and commission the detectors sensitive to antihydrogen production took place.
- Published
- 2020
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