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Towards Measuring the Ground State Hyperfine Splitting of Antihydrogen -- A Progress Report
/ Sauerzopf, C. (Stefan Meyer Inst. Subatomare Phys.) ; Capon, A.A. (Stefan Meyer Inst. Subatomare Phys.) ; Diermaier, M. (Stefan Meyer Inst. Subatomare Phys.) ; Dupré, P. (Wako, RIKEN) ; Higashi, Y. (Tokyo U., Komaba) ; Kaga, C. (ADSM, Hiroshima) ; Kolbinger, B. (Stefan Meyer Inst. Subatomare Phys.) ; Leali, M. (Brescia U. ; INFN, Pavia) ; Lehner, S. (Stefan Meyer Inst. Subatomare Phys.) ; Lodi Rizzini, E. (Brescia U. ; INFN, Pavia) et al.
We report the successful commissioning and testing of a dedicated field-ioniser chamber for measuring principal quantum number distributions in antihydrogen as part of the ASACUSA hyperfine spectroscopy apparatus. The new chamber is combined with a beam normalisation detector that consists of plastic scintillators and a retractable passivated implanted planar silicon (PIPS) detector..
arXiv:1606.01791.-
2016-06-20 - 5 p.
- Published in : Hyperfine Interact. 237 (2016) 103
Fulltext: PDF; External link: Preprint
In : 6th International Symposium on Symmetries in Subatomic Physics, Victoria, Canada, 08 - 12 Jun 2015, pp.103
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2.
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Antiproton beams with low energy spread for antihydrogen production
/ ASACUSA Collaboration
A low energy antiproton transport from the ASACUSA antiproton accumulation trap (MUSASHI trap) to the antihydrogen production trap (double cusp trap) is developed. The longitudinal antiproton energy spread after the transport line is 0.23 +- 0.02 eV, compared with 15 eV with a previous method used in 2012. [...]
arXiv:1902.09269.-
2019-05-13 - 10 p.
- Published in : JINST 14 (2019) P05009
Fulltext: 1902.09269 - PDF; fulltext1721814 - PDF; Fulltext from Publisher: PDF;
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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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A hydrogen beam to characterize the ASACUSA antihydrogen hyperfine spectrometer
/ ASACUSA Collaboration
The antihydrogen programme of the ASACUSA collaboration at the antiproton decelerator of CERN focuses on Rabi-type measurements of the ground-state hyperfine splitting of antihydrogen for a test of the combined Charge-Parity-Time symmetry. The spectroscopy apparatus consists of a microwave cavity to drive hyperfine transitions and a superconducting sextupole magnet for quantum state analysis via Stern-Gerlach separation [...]
arXiv:1812.06736.-
2019-08-11 - 11 p.
- Published in : Nucl. Instrum. Meth. A 935 (2019) 110-120
Fulltext: PDF; Fulltext from Publisher: PDF;
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Progress of antihydrogen beam production using a double cusp trap
/ Nagata, Y (Tokyo U. of Agric. Tech. ; Wako, RIKEN) ; Kuroda, N (U. Tokyo (main)) ; Dupre, P (Wako, RIKEN) ; Radics, B (Wako, RIKEN) ; Tajima, M (U. Tokyo (main) ; Wako, RIKEN) ; Capon, A A (Stefan Meyer Inst. Subatomare Phys.) ; Diermaier, M (Stefan Meyer Inst. Subatomare Phys.) ; Kaga, C (ADSM, Hiroshima) ; Kolbinger, B (Stefan Meyer Inst. Subatomare Phys.) ; Leali, M (INFN, Brescia ; Brescia U.) et al.
We report the progress of the $\bar{\text{H}}$ beam production experiment and recent developments of the double cusp trap to improve of the beam intensity of the $\bar{\text{H}}$ atomic beams, the ASACUSA Micromegas tracker to monitoring the antihydrogen synthesis and the antihydrogen beam detector..
2017 - 10 p.
- Published in : JPS Conf. Proc. 18 (2017) 011007
Fulltext: PDF;
In : 12th International Conference on Low Energy Antiproton Physics, Kanazawa, Japan, 6 - 11 Mar 2016, pp.011007
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The development of the antihydrogen beam detector: Toward the three dimensional tracking with a BGO crystal and a hodoscope
/ Nagata, Y (Tokyo U. of Agric. Tech. ; Wako, RIKEN) ; Kuroda, N (Tokyo, U. Earth Sci. Astron.) ; Sauerzopf, C (Stefan Meyer Inst. Subatomare Phys.) ; Kolbinger, B (Stefan Meyer Inst. Subatomare Phys.) ; Malbrunot, C (CERN ; Stefan Meyer Inst. Subatomare Phys.) ; Capon, A A (Stefan Meyer Inst. Subatomare Phys.) ; Dupre, P (Wako, RIKEN) ; Radics, B (Wako, RIKEN) ; Tajima, M (Tokyo, U. Earth Sci. Astron. ; Wako, RIKEN) ; Kaga, C (ADSM, Hiroshima) et al.
We developed an antihydrogen beam detector for the microwave spectroscopy of the antihydrogen hyperfine splitting. The detector consists of a position sensitive BGO calorimeter and a hodoscope. [...]
2017 - 6 p.
- Published in : JPS Conf. Proc. 18 (2017) 011038
Fulltext: PDF;
In : 12th International Conference on Low Energy Antiproton Physics, Kanazawa, Japan, 6 - 11 Mar 2016, pp.011038
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7.
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Towards a spin polarized antihydrogen beam
/ Kuroda, N (Tokyo U., Komaba) ; Ulmer, S (Nishina Ctr., RIKEN) ; Murtagh, D J (Nishina Ctr., RIKEN) ; Gorp, S (Nishina Ctr., RIKEN) ; Nagata, Y (Nishina Ctr., RIKEN) ; Diermaier, M (Stefan Meyer Inst. Subatomare Phys.) ; Federmann, S (CERN) ; Leali, M (INFN, Brescia ; Brescia U.) ; Malbrunot, C (Stefan Meyer Inst. Subatomare Phys.) ; Mascagna, V (INFN, Brescia ; Brescia U.) et al.
The ASACUSA collaboration has developed a cusp trap scheme to realize an in-flight high precision microwave spectroscopy of ground-state hyperfine splitting of antihydrogen ( H̄) for a stringent test of CPT symmetry. Cold H̄ atoms were successfullysynthesized by employing a cusp trap which consisted of a superconducting anti-Helmholtz coil and a stack of ring electrodes. [...]
2014 - 10 p.
- Published in : Hyperfine Interact. 228 (2014) 67-76
In : 11th International Conference on Low Energy Antiproton Physics, Uppsala, Sweden, 10 - 15 Jun 2013, pp.67-76
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Monte-Carlo based performance assessment of ASACUSA's antihydrogen detector
/ Nagata, Y. (Tokyo U. of Sci. ; RIKEN (main)) ; Kuroda, N. (Tokyo U., Komaba) ; Kolbinger, B. (Stefan Meyer Inst. Subatomare Phys.) ; Fleck, M. (Stefan Meyer Inst. Subatomare Phys.) ; Malbrunot, C. (Stefan Meyer Inst. Subatomare Phys. ; CERN) ; Mäckel, V. (Stefan Meyer Inst. Subatomare Phys.) ; Sauerzopf, C. (Stefan Meyer Inst. Subatomare Phys.) ; Simon, M.C. (Stefan Meyer Inst. Subatomare Phys.) ; Tajima, M. (Tokyo U., Komaba) ; Zmeskal, J. (Stefan Meyer Inst. Subatomare Phys.) et al.
An antihydrogen detector consisting of a thin BGO disk and a surrounding plastic scintillator hodoscope has been developed. We have characterized the two-dimensional positions sensitivity of the thin BGO disk and energy deposition into the BGO was calibrated using cosmic rays by comparing experimental data with Monte-Carlo simulations. [...]
arXiv:1806.00959.-
2018-12-01 - 6 p.
- Published in : Nucl. Instrum. Methods Phys. Res., A 910 (2018) 90-95
Fulltext: 1806.00959 - PDF; 10.1016_j.nima.2018.09.013 - PDF;
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10.
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Measurement of the Principal Quantum Number Distribution in a Beam of Antihydrogen Atoms
/ Kolbinger, B. (Stefan Meyer Inst. Subatomare Phys. ; CERN) ; Amsler, C. (Stefan Meyer Inst. Subatomare Phys.) ; Cuendis, S. Arguedas (Stefan Meyer Inst. Subatomare Phys. ; CERN) ; Breuker, H. (RIKEN (main)) ; Capon, A. (Stefan Meyer Inst. Subatomare Phys.) ; Costantini, G. (U. Brescia ; INFN, Pavia) ; Dupré, P. (RIKEN (main)) ; Fleck, M. (Tokyo U., Komaba) ; Gligorova, A. (Stefan Meyer Inst. Subatomare Phys.) ; Higaki, H. (Hiroshima U. (main)) et al.
The ASACUSA (Atomic Spectroscopy And Collisions Using Slow Antiprotons) collaboration plans to measure the ground-state hyperfine splitting of antihydrogen in a beam at the CERN Antiproton Decelerator with initial relative precision of 10-6 or better, to test the fundamental CPT (combination of charge conjugation, parity transformation and time reversal) symmetry between matter and antimatter. This challenging goal requires a polarised antihydrogen beam with a sufficient number of antihydrogen atoms in the ground state. [...]
arXiv:2008.04246.-
2021-03-08 - 14 p.
- Published in : Eur. Phys. J. D 75 (2021) 91
Fulltext: PDF; Fulltext from Publisher: PDF; Fulltext from publisher: PDF;
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