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1.
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Measured Properties of an Antihydrogen Beam
/ Hunter, E. D. ; Bumbar, M. ; Amsler, C. ; Bayo, M. N. ; Breuker, H. ; Cerwenka, M. ; Costantini, G. ; Ferragut, R. ; Giammarchi, M. ; Gligorova, A. et al.
/Asacusa AD-3
We report a factor of 100 increase in the antihydrogen beam intensity downstream of ASACUSA’s Cusp trap: 320 atoms detected per 15-minute run. The beam contains many Rydberg atoms, which we selectively ionize to determine their velocity and binding energy. [...]
CERN-EP-2025-195.-
Geneva : CERN, 2025 - 19.
Draft (restricted): PDF; Fulltext: PDF; External link: Additional Information
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2.
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The scintillating bar detector of the ASACUSA experiment
/ Mascagna, V (U. Brescia ; INFN, Pavia) ; Amsler, Claude (Stefan Meyer Inst. Subatomare Phys.) ; Bayo, Matias (Milan Polytechnic ; INFN, Milan) ; Breuker, Horst (Wako, RIKEN) ; Bumbar, Marcus (Vienna U. ; CERN ; Imperial Coll., London) ; Cerwenka, Matti (Stefan Meyer Inst. Subatomare Phys. ; Vienna U.) ; Costantini, Giovanni (U. Brescia ; INFN, Pavia) ; Ferragut, Rafael (Milan Polytechnic ; INFN, Milan) ; Giammarchi, Marco (INFN, Milan) ; Gligorova, Angela (Wako, RIKEN) et al.
Detecting charged pions emitted from antiproton annihilation on nuclei is a well-established technique utilized to determine annihilation vertex positions, crucial for several experiments in the antimatter field. For the past decade, a detector composed of plastic scintillating bars has been integral to the ASACUSA experiment, employed in both antihydrogen formation experiments and annihilation cross-section measurements. [...]
2025 - 8 p.
- Published in : PoS EXA-LEAP2024 (2025) 077
Fulltext: PDF;
In : International Conference on Exotic Atoms and Related Topics and Conference on Low Energy Antiprotons (EXA/LEAP 2024), Vienna, Austria, 26 - 30 Aug 2024, pp.077
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3.
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Injection and capture of antiprotons in a Penning–Malmberg trap using a drift tube accelerator and degrader foil
/ Amsler, C. (Stefan Meyer Inst. Subatomare Phys.) ; Breuker, H. (Wako, RIKEN) ; Bumbar, M. (CERN) ; Chesnevskaya, S. (Stefan Meyer Inst. Subatomare Phys.) ; Costantini, G. (Brescia U. ; INFN, Pavia) ; Ferragut, R. (INFN, Milan ; Padua U. ; INFN, Padua) ; Giammarchi, M. (Padua U. ; INFN, Padua) ; Gligorova, A. (Stefan Meyer Inst. Subatomare Phys.) ; Gosta, G. (Brescia U. ; INFN, Pavia) ; Higaki, H. (Hiroshima U.) et al.
The Antiproton Decelerator (AD) at CERN provides antiproton bunches with a kinetic energy of 5.3 MeV. The Extra-Low ENergy Antiproton ring at CERN, commissioned at the AD in 2018, now supplies a bunch of electron-cooled antiprotons at a fixed energy of 100 keV. [...]
arXiv:2403.09268.-
2024-06-12 - 22 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 1065 (2024) 169529
Fulltext: PDF;
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4.
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Antiproton annihilation at rest in thin solid targets and comparison with Monte Carlo simulations
/ Amsler, Claude (Stefan Meyer Inst. Subatomare Phys.) ; Breuker, Horst (Wako, RIKEN) ; Bumbar, Marcus (CERN ; Vienna U.) ; Cerwenka, Matti (Stefan Meyer Inst. Subatomare Phys. ; Vienna U.) ; Costantini, Giovanni (Brescia U. ; INFN, Brescia ; INFN, Pavia) ; Ferragut, Rafael (Milan Polytechnic ; INFN, Milan ; Milan U.) ; Fleck, Markus (Stefan Meyer Inst. Subatomare Phys.) ; Giammarchi, Marco (INFN, Milan ; Milan U.) ; Gligorova, Angela (Stefan Meyer Inst. Subatomare Phys.) ; Gosta, Giulia (Brescia U. ; INFN, Brescia ; INFN, Pavia) et al.
/Asacusa AD-3
The mechanism of antiproton-nucleus annihilation at rest is not fully understood, despite substantial previous experimental and theoretical work. In this study we used slow extracted, sub-keV antiprotons from the ASACUSA apparatus at CERN to measure the charged particle multiplicities and their energy deposits from antiproton annihilations at rest on three different nuclei: carbon, molybdenum and gold. [...]
arXiv:2407.06721.-
Geneva : CERN, 2024-11-17 - 18 p.
- Published in : Eur. Phys. J. A 60 (2024) 225
Draft (restricted): PDF; Fulltext: CERN-EP-2024-182 - PDF; 2407.06721 - PDF; document - PDF;
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5.
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Injection and capture of antiprotons in a Penning-Malmberg trap using a drift tube accelerator and degrader foil
/ Amsler, C. ; Breuker, H. ; Bumbar, M. ; Chesnevskaya, S. ; Costantini, G. ; Ferragut, R. ; Giammarchi, M. ; Gligorova, A. ; Gosta, G. ; Higaki, H. et al.
/Asacusa AD-3
The Antiproton Decelerator (AD) at CERN provides antiproton bunches with a kinetic energy of 5.3 MeV. The Extra-Low ENergy Antiproton ring at CERN, commissioned at the AD in 2018, now supplies a bunch of electron- cooled antiprotons at a fixed energy of 100 keV. [...]
CERN-EP-2024-060.-
Geneva : CERN, 2024 - 22.
- Published in : Nucl. Instrum. Methods Phys. Res. A
Draft (restricted): PDF; Fulltext: PDF;
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6.
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Upgrade of the positron system of the ASACUSA-Cusp experiment
/ Lanz, A. (Stefan Meyer Inst. Subatomare Phys. ; Vienna U.) ; Amsler, C. (Stefan Meyer Inst. Subatomare Phys.) ; Breuker, H. (Wako, RIKEN) ; Bumbar, M. (Stefan Meyer Inst. Subatomare Phys.) ; Chesnevskaya, S. (Stefan Meyer Inst. Subatomare Phys.) ; Costantini, G. (Brescia U. ; INFN, Pavia) ; Ferragut, R. (Milan, Polytech.) ; Giammarchi, M. (INFN, Milan) ; Gligorova, A. (Stefan Meyer Inst. Subatomare Phys.) ; Gosta, G. (Brescia U. ; INFN, Pavia) et al.
The ASACUSA-Cusp collaboration has recently upgraded the positron system to improve the production of antihydrogen. [...]
arXiv:2307.06133.
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10.
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7.
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8.
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Upgrade of the scintillating bars detector for the ASACUSA experiment
/ Costantini, Giovanni (Brescia U. ; INFN, Pavia) ; Giorleo, Luca (Brescia U.) ; Gosta, Giulia (Brescia U. ; INFN, Pavia) ; Leali, Marco (Brescia U. ; INFN, Pavia) ; Mascagna, Valerio (Brescia U. ; INFN, Pavia) ; Migliorati, Stefano (Brescia U. ; INFN, Pavia) ; Prest, Michela (Catania U. ; INFN, Milan Bicocca) ; Ronchetti, Federico (Catania U. ; INFN, Milan Bicocca) ; Solazzi, Luigi (Brescia U. ; INFN, Pavia) ; Vallazza, Erik (INFN, Milan Bicocca) et al.
The upgrade of the scintillating bars detector, used in the experiments of the ASACUSA Collaboration at the CERN Antiproton Decelerator is presented. The detector consists of several modules, each one made of ≈1m long scintillating bars, which allow the detection of the charged particles produced in the annihilations of antiprotons and antihydrogens. [...]
2022 - 5 p.
- Published in : EPJ Web Conf. 262 (2022) 01013
Fulltext: PDF;
In : 7th International Conference on Exotic Atoms and Related Topics, Online, 13 - 17 Sep 2021, pp.01013
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9.
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SDR, EVC, and SDREVC: Limitations and Extensions
/ ASACUSA-Cusp Collaboration
Methods for reducing the radius, temperature, and space charge of nonneutral plasma are usually reported for conditions which approximate an ideal Penning Malmberg trap. Here we show that (1) similar methods are still effective under surprisingly adverse circumstances: we perform SDR and SDREVC in a strong magnetic mirror field using only 3 out of 4 rotating wall petals. [...]
arXiv:2306.00862; CERN-EP-2023-102.-
Geneva : CERN, 2023-10-31 - 8.
- Published in : : 89 (2023)
Draft (restricted): PDF; Fulltext: 2306.00862 - PDF; CERN-EP-2023-102 - PDF;
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10.
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Reducing the background temperature for cyclotron cooling in a cryogenic Penning–Malmberg trap
/ Amsler, C (Stefan Meyer Inst. Subatomare Phys.) ; Breuker, H (Wako, RIKEN) ; Chesnevskaya, S (Stefan Meyer Inst. Subatomare Phys.) ; Costantini, G (Brescia U. ; INFN, Pavia) ; Ferragut, R (INFN, Milan ; Milan U.) ; Giammarchi, M (INFN, Milan ; Milan U.) ; Gligorova, A (Stefan Meyer Inst. Subatomare Phys.) ; Gosta, G (Brescia U. ; INFN, Pavia) ; Higaki, H (Hiroshima U.) ; Hunter, E D (Stefan Meyer Inst. Subatomare Phys.) et al.
Magnetized nonneutral plasma composed of electrons or positrons couples to the local microwave environment via cyclotron radiation. The equilibrium plasma temperature depends on the microwave energy density near the cyclotron frequency. [...]
2022 - 13 p.
- Published in : Phys. Plasmas 29 (2022) 083303
Fulltext: PDF;
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