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Zhadnov N, Golovizin A, Cortinovis I, Ohayon B, de Sousa Borges L, Janka G, Crivelli P. Pulsed CW laser for long-term spectroscopic measurements at high power in deep-UV. Opt Express 2023; 31:28470-28479. [PMID: 37710900 DOI: 10.1364/oe.496508] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/26/2023] [Accepted: 07/18/2023] [Indexed: 09/16/2023]
Abstract
We present a novel technique for in-vacuum cavity-enhanced UV spectroscopy that allows nearly continuous measurements over several days, minimizing mirror degradation caused by high-power UV radiation. Our method relies on pulsing of the cavity's internal power, which increases the UV intensity to maximum only for short periods when the studied atom is within the cavity mode volume while keeping the average power low to prevent mirror degradation. Additionally, this method significantly decreases laser-induced background on charged particle detectors. The described 244 nm laser system is designed for 1S-2S two-photon CW spectroscopy of muonium in the Mu-MASS project. It was tested to provide intracavity powers above 20 W, requiring maintenance only a few times a day. The pulsing technique demonstrates minimal impact on the radiation frequency, with no observed shifts exceeding 15 kHz. Our approach represents a promising new technique for high-precision spectroscopy of atoms in harsh UV environments and demonstrates the feasibility of CW spectroscopy of muonium.
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Cortinovis I, Ohayon B, de Sousa Borges L, Janka G, Golovizin A, Zhadnov N, Crivelli P. Update of Muonium 1 S-2 S transition frequency. Eur Phys J D At Mol Opt Phys 2023; 77:66. [PMID: 37090686 PMCID: PMC10115669 DOI: 10.1140/epjd/s10053-023-00639-z] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Grants] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 02/07/2023] [Accepted: 03/20/2023] [Indexed: 05/03/2023]
Abstract
Abstract We present an updated value of the Muonium 1S-2S transition frequency, highlighting contributions from different QED corrections as well as the large uncertainty in the Dirac contribution, stemming from the uncertainty of the electron to muon mass ratio. Improving the measurement of this spectral line would allow to extract a more accurate determination of fundamental constants, such as the electron to muon mass ratio or, combined with the Muonium hyperfine splitting, an independent value of the Rydberg constant. Furthermore, we report on the current status of the Mu-MASS experiment, which aims at measuring the Muonium 1S-2S transition frequency at a 10 kHz uncertainty level. Graphic abstract
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Affiliation(s)
- Irene Cortinovis
- Institute for Particle Physics and Astrophysics, ETH, 8093 Zurich, Switzerland
| | - Ben Ohayon
- Institute for Particle Physics and Astrophysics, ETH, 8093 Zurich, Switzerland
| | | | - Gianluca Janka
- Institute for Particle Physics and Astrophysics, ETH, 8093 Zurich, Switzerland
- Paul Scherrer Institute, PSI, 5232 Villigen, Switzerland
| | - Artem Golovizin
- Institute for Particle Physics and Astrophysics, ETH, 8093 Zurich, Switzerland
- P.N. Lebedev Physical Institute, Moscow, Russia 119991
| | - Nikita Zhadnov
- Institute for Particle Physics and Astrophysics, ETH, 8093 Zurich, Switzerland
- P.N. Lebedev Physical Institute, Moscow, Russia 119991
| | - Paolo Crivelli
- Institute for Particle Physics and Astrophysics, ETH, 8093 Zurich, Switzerland
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Janka G, Ohayon B, Cortinovis I, Burkley Z, de Sousa Borges L, Depero E, Golovizin A, Ni X, Salman Z, Suter A, Prokscha T, Crivelli P. Measurement of the transition frequency from 2S 1/2, F = 0 to 2P 1/2, F = 1 states in Muonium. Nat Commun 2022; 13:7273. [PMID: 36433948 PMCID: PMC9700798 DOI: 10.1038/s41467-022-34672-0] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/02/2022] [Accepted: 11/02/2022] [Indexed: 11/27/2022] Open
Abstract
Muons are puzzling physicists since their discovery when they were first thought to be the meson predicted by Yukawa to mediate the strong force. The recent result at Fermilab on the muon g-2 anomaly puts the muonic sector once more under the spotlight and calls for further measurements with this particle. Here, we present the results of the measurement of the 2S1/2, F = 0 → 2P1/2, F = 1 transition in Muonium. The measured value of 580.6(6.8) MHz is in agreement with the theoretical calculations. A value of the Lamb shift of 1045.5(6.8) MHz is extracted, compatible with previous experiments. We also determine the 2S hyperfine splitting in Muonium to be 559.6(7.2) MHz. The measured transition being isolated from the other hyperfine levels holds the promise to provide an improved determination of the Muonium Lamb shift at a level where bound state QED recoil corrections not accessible in hydrogen could be tested. This result would be sensitive to new physics in the muonic sector, e.g., to new bosons which might provide an explanation of the g-2 muon anomaly and allow to test Lorentz and CPT violation. We also present the observation of Muonium in the n = 3 excited state opening up the possibility of additional precise microwave measurements.
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Affiliation(s)
- Gianluca Janka
- grid.5801.c0000 0001 2156 2780Institute for Particle Physics and Astrophysics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - Ben Ohayon
- grid.5801.c0000 0001 2156 2780Institute for Particle Physics and Astrophysics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - Irene Cortinovis
- grid.5801.c0000 0001 2156 2780Institute for Particle Physics and Astrophysics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - Zak Burkley
- grid.5801.c0000 0001 2156 2780Institute for Particle Physics and Astrophysics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - Lucas de Sousa Borges
- grid.5801.c0000 0001 2156 2780Institute for Particle Physics and Astrophysics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - Emilio Depero
- grid.5801.c0000 0001 2156 2780Institute for Particle Physics and Astrophysics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - Artem Golovizin
- grid.5801.c0000 0001 2156 2780Institute for Particle Physics and Astrophysics, ETH Zürich, CH-8093 Zürich, Switzerland ,grid.425806.d0000 0001 0656 6476P.N. Lebedev Physical Institute, 53 Leninsky prospekt., Moscow, 119991 Russia
| | - Xiaojie Ni
- grid.5991.40000 0001 1090 7501Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Zaher Salman
- grid.5991.40000 0001 1090 7501Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Andreas Suter
- grid.5991.40000 0001 1090 7501Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Thomas Prokscha
- grid.5991.40000 0001 1090 7501Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Paolo Crivelli
- grid.5801.c0000 0001 2156 2780Institute for Particle Physics and Astrophysics, ETH Zürich, CH-8093 Zürich, Switzerland
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Ahokas J, Semakin A, Järvinen J, Hanski O, Laptiyenko A, Dvornichenko V, Salonen K, Burkley Z, Crivelli P, Golovizin A, Nesvizhevsky V, Nez F, Yzombard P, Widmann E, Vasiliev S. A large octupole magnetic trap for research with atomic hydrogen. Rev Sci Instrum 2022; 93:023201. [PMID: 35232145 DOI: 10.1063/5.0070037] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/03/2021] [Accepted: 12/13/2021] [Indexed: 06/14/2023]
Abstract
We describe the design and performance of a large magnetic trap for storage and cooling of atomic hydrogen (H). The trap operates in the vacuum space of a dilution refrigerator at a temperature of 1.5 K. Aiming at a large volume of the trap, we implemented the octupole configuration of linear currents (Ioffe bars) for the radial confinement, combined with two axial pinch coils and a 3 T solenoid for the cryogenic H dissociator. The octupole magnet consists of eight race-track segments, which are compressed toward each other with magnetic forces. This provides a mechanically stable and robust construction with a possibility of replacement or repair of each segment. A maximum trap depth of 0.54 K (0.8 T) was reached, corresponding to an effective volume of 0.5 l for hydrogen gas at 50 mK. This is an order of magnitude larger than ever used for trapping atoms.
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Affiliation(s)
- J Ahokas
- Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland
| | - A Semakin
- Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland
| | - J Järvinen
- Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland
| | - O Hanski
- Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland
| | - A Laptiyenko
- Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland
| | - V Dvornichenko
- Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland
| | - K Salonen
- Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland
| | - Z Burkley
- ETH Zurich, Institute for Particle Physics and Astrophysics, 8093 Zurich, Switzerland
| | - P Crivelli
- ETH Zurich, Institute for Particle Physics and Astrophysics, 8093 Zurich, Switzerland
| | - A Golovizin
- P.N. Lebedev Physical Institute, 53 Leninsky pr., Moscow, Ru-119991, Russia
| | - V Nesvizhevsky
- Institut Max von Laue-Paul Langevin, 71 Avenue des Martyrs, Grenoble F-38042, France
| | - F Nez
- Laboratoire Kastler Brossel, Sorbonne Université, CNRS, ENS-PSL Université, Collège de France, 75252 Paris, France
| | - P Yzombard
- Laboratoire Kastler Brossel, Sorbonne Université, CNRS, ENS-PSL Université, Collège de France, 75252 Paris, France
| | - E Widmann
- Stefan Meyer Institute for Subatomic Physics, Austrian Academy of Sciences, Kegelgasse 27, A-1030 Wien, Austria
| | - S Vasiliev
- Wihuri Physical Laboratory, Department of Physics and Astronomy, University of Turku, 20014 Turku, Finland
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Ohayon B, Janka G, Cortinovis I, Burkley Z, Borges LDS, Depero E, Golovizin A, Ni X, Salman Z, Suter A, Vigo C, Prokscha T, Crivelli P. Precision Measurement of the Lamb Shift in Muonium. Phys Rev Lett 2022; 128:011802. [PMID: 35061492 DOI: 10.1103/physrevlett.128.011802] [Citation(s) in RCA: 2] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 09/10/2021] [Accepted: 12/15/2021] [Indexed: 06/14/2023]
Abstract
We report a new measurement of the n=2 Lamb shift in Muonium. Our result of 1047.2(2.3)_{stat}(1.1)_{syst} MHz comprises an order of magnitude improvement upon the previous best measurement. This value matches the theoretical calculation within 1 standard deviation allowing us to set limits on Lorentz and CPT violation in the muonic sector, as well as on new physics coupled to muons and electrons which could provide an explanation of the muon g-2 anomaly.
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Affiliation(s)
- B Ohayon
- Institute for Particle Physics and Astrophysics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - G Janka
- Institute for Particle Physics and Astrophysics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - I Cortinovis
- Institute for Particle Physics and Astrophysics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - Z Burkley
- Institute for Particle Physics and Astrophysics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - L de Sousa Borges
- Institute for Particle Physics and Astrophysics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - E Depero
- Institute for Particle Physics and Astrophysics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - A Golovizin
- P.N. Lebedev Physical Institute, 53 Leninsky prospekt., Moscow 119991, Russia
| | - X Ni
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - Z Salman
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - A Suter
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - C Vigo
- Institute for Particle Physics and Astrophysics, ETH Zürich, CH-8093 Zürich, Switzerland
| | - T Prokscha
- Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland
| | - P Crivelli
- Institute for Particle Physics and Astrophysics, ETH Zürich, CH-8093 Zürich, Switzerland
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Golovizin A, Tregubov D, Mishin D, Provorchenko D, Kolachevsky N. Compact magneto-optical trap of thulium atoms for a transportable optical clock. Opt Express 2021; 29:36734-36744. [PMID: 34809077 DOI: 10.1364/oe.435105] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/25/2021] [Accepted: 08/19/2021] [Indexed: 06/13/2023]
Abstract
We have developed a compact vacuum system for laser cooling and spectroscopy of neutral thulium atoms. Compactness is achieved by obviating a classical Zeeman slower section and placing an atomic oven close to a magneto-optical trap (MOT), specifically at the distance of 11 cm. In this configuration, we significantly gained in solid angle of an atomic beam, which is affected by MOT laser beams, and reached 1 million atoms loaded directly in the MOT with only 15 mW of MOT cooling beams net power. By exploiting Zeeman-like deceleration of atoms with an additional laser beam and tailoring the MOT magnetic field gradient with a small magnetic coil, we demonstrated trapping of up to 13 million atoms. These results show great perspective of the developed setup for realizing a compact high-performance optical atomic clock based on thulium atoms.
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Golovizin A, Kalganova E, Sukachev D, Vishnyakova G, Tregubov D, Fedorov S, Akimov A, Kolachevsky N, Khabarova K, Sorokin V. Detection of 1.14 μm Magnetic Dipole Transition in Ultracold Thulium. EPJ Web of Conferences 2015. [DOI: 10.1051/epjconf/201510306002] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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Golovizin A, Kalganova E, Vishnyakova G, Tregubov D, Khabarova K, Sorokin V, Kolachevsky N. Laser Cooling of Lanthanides: from Optical Clocks to Quantum Simulators. EPJ Web of Conferences 2015. [DOI: 10.1051/epjconf/201510301007] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/14/2022] Open
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