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1. A hydrogen beam to characterize the ASACUSA antihydrogen hyperfine spectrometer

Author

Malbrunot, C., Diermaier, M., Simon, M. C., Amsler, C., Cuendis, S. Arguedas, Breuker, H., Evans, C., Fleck, M., Kolbinger, B., Lanz, A., Leali, M., Maeckel, V., Mascagna, V., Massiczek, O., Matsuda, Y., Nagata, Y., Sauerzopf, C., Venturelli, L., Widmann, E., Wiesinger, M., Yamazaki, Y., and Zmeskal, J.

Subjects
Physics - Atomic Physics
Abstract

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. However, the small production rates of antihydrogen forestall comprehensive performance studies on the spectroscopy apparatus. For this purpose a hydrogen source and detector have been developed which in conjunction with ASACUSA's hyperfine spectroscopy equipment form a complete Rabi experiment. We report on the formation of a cooled, polarized, and time modulated beam of atomic hydrogen and its detection using a quadrupole mass spectrometer and a lock-in amplification scheme. In addition key features of ASACUSA's hyperfine spectroscopy apparatus are discussed.t

Published
2018
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2. Hyperfine spectroscopy of hydrogen and antihydrogen in ASACUSA

Author

Widmann, E., Amsler, C., Cuendis, S. Arguedas, Breuker, H., Diermaier, M., Dupré, P., Evans, C., Fleck, M., Gligorova, A., Higaki, H., Kanai, Y., Kolbinger, B., Kuroda, N., Leali, M., Leite, A. M. M., Mäckel, V., Malbrunot, C., Mascagna, V., Massiczek, O., Matsuda, Y., Murtagh, D. J., Nagata, Y., Nanda, A., Phan, D., Sauerzopf, C., Simon, M. C., Tajima, M., Spitzer, H., Strube, M., Ulmer, S., Venturelli, L., Wiesinger, M., Yamazaki, Y., and Zmeskal, J.

Subjects
Physics - Atomic Physics
Abstract

The ASACUSA collaboration at the Antiproton Decelerator of CERN aims at a precise measurement of the antihydrogen ground-state hyperfine structure as a test of the fundamental CPT symmetry. A beam of antihydrogen atoms is formed in a CUSP trap, undergoes Rabi-type spectroscopy and is detected downstream in a dedicated antihydrogen detector. In parallel measurements using a polarized hydrogen beam are being performed to commission the spectroscopy apparatus and to perform measurements of parameters of the Standard Model Extension (SME). The current status of antihydrogen spectroscopy is reviewed and progress of ASACUSA is presented., Comment: Proceedings of the 7th International Syposium on Symmetries in Subatomic Physics SSP2018, Aachen (Germany), 10 - 15 Jun 2018. Corrected error in Fig. 1, updated caption, add titles to references

Published
2018
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3. In-beam measurement of the hydrogen hyperfine splitting - towards antihydrogen spectroscopy

Author

Diermaier, M., Jepsen, C. B., Kolbinger, B., Malbrunot, C., Massiczek, O., Sauerzopf, C., Simon, M. C., Zmeskal, J., and Widmann, E.

Subjects
Physics - Atomic Physics
Abstract

Antihydrogen, the lightest atom consisting purely of antimatter, is an ideal laboratory to study the CPT symmetry by comparison to hydrogen. With respect to absolute precision, transitions within the ground-state hyperfine structure (GS-HFS) are most appealing by virtue of their small energy separation. ASACUSA proposed employing a beam of cold antihydrogen atoms in a Rabi-type experiment to determine the GS-HFS in a field-free region. Here we present a measurement of the zero-field hydrogen GS-HFS using the spectroscopy apparatus of ASACUSA's antihydrogen experiment. The measured value of $\nu_\mathrm{HF}$=$1~420~405~748.4(3.4)(1.6)~\textrm{Hz}$ with a relative precision of $\Delta$$\nu_\mathrm{HF}$/$\nu_\mathrm{HF}$=$2.7\times10^{-9}$ constitutes the most precise determination of this quantity in a beam and verifies the developed spectroscopy methods for the antihydrogen HFS experiment to the ppb level. Together with the recently presented observation of antihydrogen atoms $2.7~\textrm{m}$ downstream of the production region, the prerequisites for a measurement with antihydrogen are now available within the ASACUSA collaboration.

Published
2016
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4. Towards Measuring the Ground State Hyperfine Splitting of Antihydrogen -- A Progress Report

Author

Sauerzopf, C., Capon, A., Diermaier, M., Dupré, P., Higashi, Y., Kaga, C., Kolbinger, B., Leali, M., Lehner, S., Rizzini, E. Lodi, Malbrunot, C., Mascagna, V., Massiczek, O., Murtagh, D. J., Nagata, Y., Radics, B., Simon, M. C., Suzuki, K., Tajima, M., Ulmer, S., Vamosi, S., van Gorp, S., Zmeskal, J., Breuker, H., Higaki, H., Kanai, Y., Kuroda, N., Matsuda, Y., Venturelli, L., Widmann, E., and Yamazaki, Y.

Subjects
Physics - Instrumentation and Detectors
Abstract

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., Comment: 5 pages, 2 figures, 6th International Symposium on Symmetries in Subatomic Physics (SSP2015)

Published
2016
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5. Search for polarization effects in the antiproton production process

Author

Grzonka, D., Kilian, K., Ritman, J., Sefzick, T., Oelert, W., Diermaier, M., Widmann, E., Zmeskal, J., Glowacz, B., Moskal, P., Zielinski, M., Wolke, M., Nadel-Turonski, P., Carmignotto, M., Horn, T., Mkrtchyan, H., Asaturyan, A., Mkrtchyan, A., Tadevosyan, V., Zhamkochyan, S., Malbrunot-Ettenauer, S., Eyrich, W., Hauenstein, F., and Zink, A.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Nuclear Experiment
Abstract

For the production of a polarized antiproton beam various methods have been suggested including the possibility that antiprotons may be produced polarized which will be checked experimentally. The polarization of antiprotons produced under typical conditions for antiproton beam preparation will be measured at the CERN/PS. If the production process creates some polarization a polarized antiproton beam could be prepared by a rather simple modification of the antiproton beam facility. The detection setup and the expected experimental conditions are described.

Published
2015
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6. Numerical Simulations of Hyperfine Transitions of Antihydrogen

Author

Kolbinger, B., Capon, A., Diermaier, M., Lehner, S., Malbrunot, C., Massiczek, O., Sauerzopf, C., Simon, M. C., and Widmann, E.

Subjects
Physics - Atomic Physics
Abstract

One of the ASACUSA (Atomic Spectroscopy And Collisions Using Slow Antiprotons) collaboration's goals is the measurement of the ground state hyperfine transition frequency in antihydrogen, the antimatter counterpart of one of the best known systems in physics. This high precision experiment yields a sensitive test of the fundamental symmetry of CPT. Numerical simulations of hyperfine transitions of antihydrogen atoms have been performed providing information on the required antihydrogen events and the achievable precision.

Published
2015
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7. Spectroscopy Apparatus for the Measurement of The Hyperfine Structure of Antihydrogen

Author

Malbrunot, C., Caradonna, P., Diermaier, M., Dilaver, N., Friedreich, S., Kolbinger, B., Lehner, S., Lundmark, R., Massiczek, O., Radics, B., Sauerzopf, C., Simon, M., Widmann, E., Wolf, M., Wunschek, B., and Zmeskal, J.

Subjects
Physics - Instrumentation and Detectors, High Energy Physics - Experiment, Physics - Atomic Physics
Abstract

The ASACUSA CUSP collaboration at the Antiproton Decelerator (AD) of CERN is planning to measure the ground-state hyperfine splitting of antihydrogen using an atomic spectroscopy beamline. We describe here the latest developments on the spectroscopy apparatus developed to be coupled to the antihydrogen production setup (CUSP)., Comment: Proceedings of the 11th International Conference on Low Energy Antiproton Physics (LEAP 2013) held in Uppsala, Sweden, 10 to 15 June, 2013

Published
2014
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8. Measurement of the hyperfine structure of antihydrogen in a beam

Author

Widmann, E., Diermaier, M., Juhasz, B., Malbrunot, C., Massiczek, O., Sauerzopf, C., Suzuki, K., Wünschek, B., Zmeskal, J., Federmann, S., Kuroda, N., Ulmer, S., and Yamazaki, Y.

Subjects
Physics - Atomic Physics, High Energy Physics - Experiment
Abstract

A measurement of the hyperfine structure of antihydrogen promises one of the best tests of CPT symmetry. We describe an experiment planned at the Antiproton Decelerator of CERN to measure this quantity in a beam of slow antihydrogen atoms., Comment: 5th International Symposium on Symmetries in Subatomic Physics (SSP2012), Groningen (The Netherlands), June 18 to 22, 2012

Published
2013
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10. The ASACUSA CUSP: an antihydrogen experiment

Author

Kuroda, N., Ulmer, S., Murtagh, D. J., Van Gorp, S., Nagata, Y., Diermaier, M., Federmann, S., Leali, M., Malbrunot, C., Mascagna, V., Massiczek, O., Michishio, K., Mizutani, T., Mohri, A., Nagahama, H., Ohtsuka, M., Radics, B., Sakurai, S., Sauerzopf, C., Suzuki, K., Tajima, M., Torii, H. A., Venturelli, L., Wünschek, B., Zmeskal, J., Zurlo, N., Higaki, H., Kanai, Y., Lodi Rizzini, E., Nagashima, Y., Matsuda, Y., Widmann, E., Yamazaki, Y., Wada, Michiharu, editor, Schury, Peter, editor, and Ichikawa, Yuichi, editor

Published
2017
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11. The ASACUSA CUSP: an antihydrogen experiment

Author

Kuroda, N., Ulmer, S., Murtagh, D. J., Van Gorp, S., Nagata, Y., Diermaier, M., Federmann, S., Leali, M., Malbrunot, C., Mascagna, V., Massiczek, O., Michishio, K., Mizutani, T., Mohri, A., Nagahama, H., Ohtsuka, M., Radics, B., Sakurai, S., Sauerzopf, C., Suzuki, K., Tajima, M., Torii, H. A., Venturelli, L., Wünschek, B., Zmeskal, J., Zurlo, N., Higaki, H., Kanai, Y., Rizzini, E. Lodi, Nagashima, Y., Matsuda, Y., Widmann, E., and Yamazaki, Y.

Published
2015
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14. Polarization analysis of p̄ produced in pA collisions

Author

Grzonka D., Alfs D., Asaturyan A., Carmignotto M., Diermaier M., Eyrich W., Głowacz B., Hauenstein F., Horn T., Kilian K., Lersch D., Malbrunot-Ettenauer S., Mkrtchyan A., Mkrtchyan H., Moskal P., Nadel-Turonski P., Oelert W., Ritman J., Sefzick T., Tadevosyan V., Widmann E., Wolke M., Zhamkochyan S., Zieliński M., Zink A., and Zmeskal J.

Subjects
Physics, QC1-999
Abstract

A quite simple procedure for the generation of a polarized antiproton beam could be worked out if antiprotons are produced with some polarization. In order to investigate this possibility measurements of the polarization of produced antiprotons have been started at a CERN/PS test beam. The polarization will be determined from the asymmetry of the elastic antiproton scattering at a liquid hydrogen target in the CNI region for which the analyzing power is well known. The data are under analysis and an additional measurement is done in 2018. Details on the experiment and the ongoing data analysis will be given.

Published
2019
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15. Drift chamber calibration and particle identification in the P-349 experiment

Author

Alfs D., Asaturyan A., Carmignotto M., Diermaier M., Eyrich W., Głowacz B., Grzonka D., Hauenstein F., Horn T., Kilian K., Lersch D., Malbrunot-Ettenauer S., Mkrtchyan A., Mkrtchyan H., Moskal P., Nadel-Turonski P., Oelert W., Ritman J., Sefzick T., Tadevosyan V., Widmann E., Wolke M., Zhamkochyan S., Zieliński M., Zink A., and Zmeskal J.

Subjects
Physics, QC1-999
Abstract

The goal of the P-349 experiment is to test whether 3.5 GeV/c antiprotons produced in high-energy proton-proton collisions are polarized in view of the preparation of a polarized antiproton beam. In this article, we present the details of the ongoing analysis focused on the drift chambers calibration and particle identification with DIRC.

Published
2019
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16. Towards a spin polarized antihydrogen beam

Author

Kuroda, N., Ulmer, S., Murtagh, D. J., Van Gorp, S., Nagata, Y., Diermaier, M., Federmann, S., Leali, M., Malbrunot, C., Mascagna, V., Massiczek, O., Michishio, K., Mizutani, T., Mohri, A., Nagahama, H., Ohtsuka, M., Radics, B., Sakurai, S., Sauerzopf, C., Suzuki, K., Tajima, M., Torii, H. A., Venturelli, L., Wünschek, B., Zmeskal, J., Zurlo, N., Higaki, H., Kanai, Y., Lodi-Rizzini, E., Nagashima, Y., Matsuda, Y., Widmann, E., and Yamazaki, Y.

Published
2014
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17. The ASACUSA CUSP: an antihydrogen experiment

Author

Kuroda, N., primary, Ulmer, S., additional, Murtagh, D. J., additional, Van Gorp, S., additional, Nagata, Y., additional, Diermaier, M., additional, Federmann, S., additional, Leali, M., additional, Malbrunot, C., additional, Mascagna, V., additional, Massiczek, O., additional, Michishio, K., additional, Mizutani, T., additional, Mohri, A., additional, Nagahama, H., additional, Ohtsuka, M., additional, Radics, B., additional, Sakurai, S., additional, Sauerzopf, C., additional, Suzuki, K., additional, Tajima, M., additional, Torii, H. A., additional, Venturelli, L., additional, Wünschek, B., additional, Zmeskal, J., additional, Zurlo, N., additional, Higaki, H., additional, Kanai, Y., additional, Lodi Rizzini, E., additional, Nagashima, Y., additional, Matsuda, Y., additional, Widmann, E., additional, and Yamazaki, Y., additional

Published
2015
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20. Recent Developments from ASACUSA on Antihydrogen Detection

Author

Kolbinger B., Amsler C., Breuker H., Diermaier M., Dupré P., Fleck M., Gligorova A., Higaki H., Kanai Y., Kobayashi T., Leali M., Mäckel V., Malbrunot C., Mascagna V., Massiczek O., Matsuda Y., Murtagh D.j., Nagata Y., Sauerzopf C., Simon M.C., Tajima M., Ulmer S., Kuroda N., Venturelli L., Widmann E., Yamazaki Y., and Zmeskal J.

Subjects
Physics, QC1-999
Abstract

The ASACUSA Collaboration at CERNs Antiproton Decelerator aims to measure the ground state hyperfine splitting of antihydrogen with high precision to test the fundamental symmetry of CPT (combination of charge conjugation, parity transformation, and time reversal). For this purpose an antihydrogen detector has been developed. Its task is to count the arriving antihydrogen atoms and therefore distinguish backgroundevents (mainly cosmics) from antiproton annihilations originating from antihydrogen atoms which are produced only in small amounts. A central BGO crystal disk with position sensitive read-out detects the annihilation and a surrounding two-layered hodoscope is used for tracking charged secondaries. The hodoscope has been recently upgraded to allow precise vertex reconstruction. A machine learning analysis based on measured antiproton annihilations and cosmic rays has been developed to identify antihydrogen events.

Published
2018
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21. Measurement of the hyperfine structure of antihydrogen in a beam

Author

Widmann, E., primary, Diermaier, M., additional, Juhász, B., additional, Malbrunot, C., additional, Massiczek, O., additional, Sauerzopf, C., additional, Suzuki, K., additional, Wünschek, B., additional, Zmeskal, J., additional, Federmann, S., additional, Kuroda, N., additional, Ulmer, S., additional, and Yamazaki, Y., additional

Published
2013
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22. Status of the analysis for the search of polarization in the antiproton production process

Author

Alfs D., Asaturyan A., Carmignotto M., Diermaier M., Eyrich W., Głowacz B., Grzonka D., Hauenstein F., Horn T., Kilian K., Malbrunot-Ettenauer S., Mkrtchyan A., Mkrtchyan H., Moskal P., Nadel-Turonski P., Oelert W., Ritman J., Sefzick T., Tadevosyan V., Widmann E., Wolke M., Zhamkochyan S., Zieliński M., Zink A., and Zmeskal J.

Subjects
Physics, QC1-999
Abstract

The P-349 experiment aims to test whether for antiprotons the production process itself can be a source of polarization in view of the preparation of a polarized antiproton beam. In this article we present the details of performed measurements and report on the status of the ongoing analysis.

Published
2016
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23. Polarization analysis of <(p)over bar> produced in pA collisions

Author

Grzonka, D., Alfs, D., Asaturyan, A., Carmignotto, M., Diermaier, M., Eyrich, W., Gowacz, B., Hauenstein, F., Horn, T., Kilian, K., Lersch, D., Malbrunot-Ettenauer, S., Mkrtchyan, A., Mkrtchyan, H., Moskal, P., Nadel-Turonski, P., Oelert, W., Ritman, J., Sefzick, T., Tadevosyan, V, Widmann, E., Wolke, Magnus, Zhamkochyan, S., Zielinski, M., Zink, A., and Zmeskal, J.

Subjects
Subatomär fysik, Subatomic Physics, Physics::Accelerator Physics, High Energy Physics::Experiment, Physics::Atomic Physics, Nuclear Experiment
Abstract

A quite simple procedure for the generation of a polarized antiproton beam could be worked out if antiprotons are produced with some polarization. In order to investigate this possibility measurements of the polarization of produced antiprotons have been started at a CERN/PS test beam. The polarization will be determined from the asymmetry of the elastic antiproton scattering at a liquid hydrogen target in the CNI region for which the analyzing power is well known. The data are under analysis and an additional measurement is done in 2018. Details on the experiment and the ongoing data analysis will be given.

Published
2019

24. Polarization analysis of $\bar{\rho}$ produced in pA collisions

Author

Grzonka, D, Alfs, D, Asaturyan, A, Carmignotto, M, Diermaier, M, Eyrich, W, Głowacz, B, Hauenstein, F, Horn, T, Kilian, K, Lersch, D, Malbrunot-Ettenauer, S, Mkrtchyan, A, Mkrtchyan, H, Moskal, P, Nadel-Turonski, P, Oelert, W, Ritman, J, Sefzick, T, Tadevosyan, V, Widmann, E, Wolke, M, Zhamkochyan, S, Zieliński, M, Zink, A, and Zmeskal, J

Subjects
Physics::Accelerator Physics, High Energy Physics::Experiment, Physics::Atomic Physics, Nuclear Experiment, Particle Physics - Experiment
Abstract

A quite simple procedure for the generation of a polarized antiproton beam could be worked out if antiprotons are produced with some polarization. In order to investigate this possibility measurements of the polarization of produced antiprotons have been started at a CERN/PS test beam. The polarization will be determined from the asymmetry of the elastic antiproton scattering at a liquid hydrogen target in the CNI region for which the analyzing power is well known. The data are under analysis and an additional measurement is done in 2018. Details on the experiment and the ongoing data analysis will be given.

Published
2019

25. Search for polarized antiproton production

Author

Grzonka, D., primary, Alfs, D., additional, Asaturyan, A., additional, Carmignotto, M., additional, Diermaier, M., additional, Eyrich, W., additional, Głowacz, B., additional, Hauenstein, F., additional, Horn, T., additional, Kilian, K., additional, Lersch, D., additional, Malbrunot-Ettenauer, S., additional, Mkrtchyan, A., additional, Mkrtchyan, H., additional, Moskal, P., additional, Nadel-Turonski, P., additional, Oelert, W., additional, Ritman, J., additional, Sefzick, T., additional, Tadevosyan, V., additional, Widmann, E., additional, Wolke, M., additional, Zhamkochyan, S., additional, Zieliński, M., additional, Zink, A., additional, and Zmeskal, J., additional

Published
2019
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26. Drift chamber calibration and particle identification in the P-349 experiment

Author

Alfs, D., Asaturyan, A., Carmignotto, M., Diermaier, M., Eyrich, W., Glowacz, B., Grzonka, D., Hauenstein, F., Horn, T., Kilian, K., Lersch, D., Malbrunot-Ettenauer, S., Mkrtchyan, A., Mkrtchyan, H., Moskal, P., Nadel-Turonski, P., Oelert, W., Ritman, J., Sefzick, T., Tadevosyan, V, Widmann, E., Wolke, Magnus, Zhamkochyan, S., Zielinski, M., Zink, A., Zmeskal, J., Alfs, D., Asaturyan, A., Carmignotto, M., Diermaier, M., Eyrich, W., Glowacz, B., Grzonka, D., Hauenstein, F., Horn, T., Kilian, K., Lersch, D., Malbrunot-Ettenauer, S., Mkrtchyan, A., Mkrtchyan, H., Moskal, P., Nadel-Turonski, P., Oelert, W., Ritman, J., Sefzick, T., Tadevosyan, V, Widmann, E., Wolke, Magnus, Zhamkochyan, S., Zielinski, M., Zink, A., and Zmeskal, J.

Abstract

The goal of the P-349 experiment is to test whether 3.5 GeV/c antiprotons produced in high-energy proton-proton collisions are polarized in view of the preparation of a polarized antiproton beam. In this article, we present the details of the ongoing analysis focused on the drift chambers calibration and particle identification with DIRC.

Published
2019
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27. Search for polarized antiproton production

Author

Grzonka, D., Alfs, D., Asaturyan, A., Carmignotto, M., Diermaier, M., Eyrich, W., Glowacz, B., Hauenstein, F., Horn, T., Kilian, K., Lersch, D., Malbrunot-Ettenauer, S., Mkrtchyan, A., Mkrtchyan, H., Moskal, P., Nadel-Turonski, P., Oelert, W., Ritman, J., Sefzick, T., Tadevosyan, V., Widmann, E., Wolke, Magnus, Zhamkochyan, S., Zielinski, M., Zink, A., Zmeskal, J., Grzonka, D., Alfs, D., Asaturyan, A., Carmignotto, M., Diermaier, M., Eyrich, W., Glowacz, B., Hauenstein, F., Horn, T., Kilian, K., Lersch, D., Malbrunot-Ettenauer, S., Mkrtchyan, A., Mkrtchyan, H., Moskal, P., Nadel-Turonski, P., Oelert, W., Ritman, J., Sefzick, T., Tadevosyan, V., Widmann, E., Wolke, Magnus, Zhamkochyan, S., Zielinski, M., Zink, A., and Zmeskal, J.

Abstract

The production of antiprotons is studied in view of possible polarization effects as basis for a polarized antiproton beam. If antiprotons are produced with some polarization, a quite simple procedure for the generation of a polarized antiproton beam could be worked out. The experiments are performed at the CERN PS test beam T11 where secondary particles with momenta around 3.5 GeV/c are selected. The polarization analysis is performed by measuring the asymmetry of the elastic (p) over barp-scattering in the Coulomb-nuclear interference region. The detection system includes Cherenkov and tracking detectors for the particle identification and the 3d track reconstruction. Details on the detection system and the status of the analysis are given.

Published
2019
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28. Hyperfine spectroscopy of hydrogen and antihydrogen in ASACUSA

Author

Widmann, E., primary, Amsler, C., additional, Arguedas Cuendis, S., additional, Breuker, H., additional, Diermaier, M., additional, Dupré, P., additional, Evans, C., additional, Fleck, M., additional, Gligorova, A., additional, Higaki, H., additional, Kanai, Y., additional, Kolbinger, B., additional, Kuroda, N., additional, Leali, M., additional, Leite, A. M. M., additional, Mäckel, V., additional, Malbrunot, C., additional, Mascagna, V., additional, Massiczek, O., additional, Matsuda, Y., additional, Murtagh, D. J., additional, Nagata, Y., additional, Nanda, A., additional, Phan, D., additional, Sauerzopf, C., additional, Simon, M. C., additional, Tajima, M., additional, Spitzer, H., additional, Strube, M., additional, Ulmer, S., additional, Venturelli, L., additional, Wiesinger, M., additional, Yamazaki, Y., additional, and Zmeskal, J., additional

Published
2018
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29. Drift chamber calibration and particle identification in the P-349 experiment.

Author

Wrońska, A., Magiera, A., Przygoda, W., Alfs, D., Asaturyan, A., Carmignotto, M., Diermaier, M., Eyrich, W., Głowacz, B., Grzonka, D., Hauenstein, F., Horn, T., Kilian, K., Lersch, D., Malbrunot-Ettenauer, S., Mkrtchyan, A., Mkrtchyan, H., Moskal, P., Nadel-Turonski, P., and Oelert, W.

Subjects
ANTIPROTONS, ANTIPARTICLES, BEVATRONS, PLEISTOCENE stratigraphic geology, NUCLEAR counters
Abstract

The goal of the P-349 experiment is to test whether 3.5 GeV/c antiprotons produced in high-energy proton-proton collisions are polarized in view of the preparation of a polarized antiproton beam. In this article, we present the details of the ongoing analysis focused on the drift chambers calibration and particle identification with DIRC. [ABSTRACT FROM AUTHOR]

Published
2019
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30. Polarization analysis of p̄ produced in pA collisions.

Author

Wrońska, A., Magiera, A., Przygoda, W., Grzonka, D., Alfs, D., Asaturyan, A., Carmignotto, M., Diermaier, M., Eyrich, W., Głowacz, B., Hauenstein, F., Horn, T., Kilian, K., Lersch, D., Malbrunot-Ettenauer, S., Mkrtchyan, A., Mkrtchyan, H., Moskal, P., Nadel-Turonski, P., and Oelert, W.

Subjects
POLARIZATION (Nuclear physics), ANTIPARTICLES, BEVATRONS, ANTIPROTONS, ANTIHYDROGEN
Abstract

A quite simple procedure for the generation of a polarized antiproton beam could be worked out if antiprotons are produced with some polarization. In order to investigate this possibility measurements of the polarization of produced antiprotons have been started at a CERN/PS test beam. The polarization will be determined from the asymmetry of the elastic antiproton scattering at a liquid hydrogen target in the CNI region for which the analyzing power is well known. The data are under analysis and an additional measurement is done in 2018. Details on the experiment and the ongoing data analysis will be given. [ABSTRACT FROM AUTHOR]

Published
2019
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31. Drift Chamber Calibration and Track Reconstruction in the P349 Antiproton Polarization Experiment

Author

Alfs, D, Głowacz, B, Moskal, P, Zieliński, M, Grzonka, D, Hauenstein, F, Kilian, K, Lersch, D, Ritman, J, Sefzick, T, Oelert, W, Diermaier, M, Widmann, E, Zmeskal, J, Wolke, M, Nadel-Turonski, P, Carmignotto, M, Horn, T, Mkrtchyan, H, Asaturyan, A, Mkrtchyan, A, Tadevosyan, V, Zhamkochyan, S, Malbrunot-Ettenauer, S, Eyrich, W, and Zink, A

Subjects
Physics, 010308 nuclear & particles physics, Track (disk drive), General Physics and Astronomy, Polarization (waves), 01 natural sciences, Nuclear physics, Antiproton, 0103 physical sciences, Calibration, Physics::Accelerator Physics, High Energy Physics::Experiment, ddc:530, Physics::Atomic Physics, Detectors and Experimental Techniques, Nuclear Experiment, 010306 general physics, Computer Science::Databases
Abstract

The goal of the P349 experiment is to test whether the antiproton production process can be itself a source of antiproton polarization. In this article, we present the motivation and details of the performed measurement. We report on the status of the analysis focusing mainly on calibration of the drift chambers and 3d track reconstruction.

Published
2017
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32. Progress of Antihydrogen Beam Production Using a Double Cusp Trap

Author

Nagata, Y., primary, Kuroda, N., additional, Dupre, P., additional, Radics, B., additional, Tajima, M., additional, Capon, A. A., additional, Diermaier, M., additional, Kaga, C., additional, Kolbinger, B., additional, Leali, M., additional, Rizzini, E. Lodi, additional, Malbrunot, C., additional, Mascagna, V., additional, Massiczek, O., additional, Matsudate, T., additional, Sauerzopf, C., additional, Simon, M. C., additional, Suzuki, K., additional, Zmeskal, J., additional, Breuker, H., additional, Higaki, H., additional, Kanai, Y., additional, Matsuda, Y., additional, Ulmer, S., additional, Venturelli, L., additional, Widmann, E., additional, and Yamazaki, Y., additional

Published
2017
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33. Towards measuring the ground state hyperfine splitting of antihydrogen - a progress report

Author

Sauerzopf, Clemens, Abo, Y., Capon, A., Diermaier, M., Dupré, P., Higashi, Y., Ishikawa, S., Kaga, C., Kolbinger, B., Leali, M., Lehner, S., Malbrunot, C., Mascagna, V., Massiczek, O., Murtag, D. J., Nagata, Y., Radics, B., Simon, M. C., Suzuki, K., Tajima, M., Ulmer, S., Vamosi, S., von Gorp, S., Venturelli, L., Zmeskal, J., Breuker, H., Higaki, H., Kanai, Y., Kuroda, N., Lodi Rizzini, E., Matsuda, Y., Widmann, E., and Yamazaki, Y.

Subjects
Antiproton Decelerator (AD), Physics::Instrumentation and Detectors, hyperfine structure, Physics::Atomic Physics, ASACUSA, 7. Clean energy, Antihydrogen
Abstract

The matter - anti matter asymmetry observed in the universe today still lacks a quantitative explanation. One possibility that could contribute to the observed state could be a violation of the combined Charge-, Partiy- and Timesymmetries (CPT). To test if the CPT symmetry is broken the ASACUSA collaboration (Atomic Spectroscopy And Collisions Using Slow Antiprotons) at the CERN AD (Antiproton Decelerator) tries to produce a low temperature beam of antihydrogen - the most simple atomic system built only of anti particles. The ground state hyperfine splitting of hydrogen is one of the most precisely determined quantities in physics. Therefore it follows naturally to test CPT invariance by comparing the ground state hyperfine splitting of hydrogen and antihydrogen at zero B field. This contribution will focus on presenting the current state of the fully assembled spectroscopy beamline, including a field-ioniser chamber, a strip-line resonator microwave cavity, a super conducting sextupole magnet and a detector for counting antihydrogen annihilations. We will put a spotlight on the performance of the beamline and on the detection part of the spectrometer. Our spectroscopy apparatus was tested with a beam of cold hydrogen and these tests lead to a measurement of the GS-HFS of hydrogen whose precision is in good agreement with simulation. The newly developed detector is composed of a position sensitive Bismutgermanat (BGO) disc in the centre and a two layer hodoscope made of plastic scintillators that is read via silicon photo multipliers (SiPM) with self developed frontend electronics. In addition, our first preliminary results of the detector performance with the fully assembled beamline from the 2014 beamtime at CERN are discussed.

Published
2015
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34. Recent Developments from ASACUSA on Antihydrogen Detection.

Author

Bühler, P., Kolbinger, B., Amsler, C., Breuker, H., Diermaier, M., Dupré, P., Fleck, M., Gligorova, A., Higaki, H., Kanai, Y., Kobayashi, T., Leali, M., Mäckel, V., Malbrunot, C., Mascagna, V., Massiczek, O., Matsuda, Y., Murtagh, D.J., Nagata, Y., and Sauerzopf, C.

Subjects
PROTON & antiproton annihilation, ANTIHYDROGEN, QUANTUM field theory, METAPHYSICAL cosmology, MACHINE learning
Abstract

The ASACUSA Collaboration at CERNs Antiproton Decelerator aims to measure the ground state hyperfine splitting of antihydrogen with high precision to test the fundamental symmetry of CPT (combination of charge conjugation, parity transformation, and time reversal). For this purpose an antihydrogen detector has been developed. Its task is to count the arriving antihydrogen atoms and therefore distinguish backgroundevents (mainly cosmics) from antiproton annihilations originating from antihydrogen atoms which are produced only in small amounts. A central BGO crystal disk with position sensitive read-out detects the annihilation and a surrounding two-layered hodoscope is used for tracking charged secondaries. The hodoscope has been recently upgraded to allow precise vertex reconstruction. A machine learning analysis based on measured antiproton annihilations and cosmic rays has been developed to identify antihydrogen events. [ABSTRACT FROM AUTHOR]

Published
2018
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35. Hyperfine spectroscopy of hydrogen and antihydrogen in ASACUSA.

Author

Widmann, E., Amsler, C., Arguedas Cuendis, S., Breuker, H., Diermaier, M., Dupré, P., Evans, C., Fleck, M., Gligorova, A., Higaki, H., Kanai, Y., Kolbinger, B., Kuroda, N., Leali, M., Leite, A. M. M., Mäckel, V., Malbrunot, C., Mascagna, V., Massiczek, O., and Matsuda, Y.

Subjects
ANTIHYDROGEN, ATOMIC beams, SPECTROMETRY, HYPERFINE structure, UNITS of measurement, HYDROGEN
Abstract

The ASACUSA collaboration at the Antiproton Decelerator of CERN aims at a precise measurement of the antihydrogen ground-state hyperfine structure as a test of the fundamental CPT symmetry. A beam of antihydrogen atoms is formed in a CUSP trap, undergoes Rabi-type spectroscopy and is detected downstream in a dedicated antihydrogen detector. In parallel measurements using a polarized hydrogen beam are being performed to commission the spectroscopy apparatus and to perform measurements of parameters of the Standard Model Extension (SME). The current status of antihydrogen spectroscopy is reviewed and progress of ASACUSA is presented. [ABSTRACT FROM AUTHOR]

Published
2019
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36. Drift Chamber Calibration And Track Reconstruction In The P349 Antiproton Polarization Experiment

Author

Alfs, D., Glowacz, B., Moskal, P., Zielinski, M., Grzonka, D., Hauenstein, F., Kilian, K., Lersch, D., Ritman, J., Sefzick, T., Oelert, W., Diermaier, M., Widmann, E., Zmeskal, J., Wolke, Magnus, Nadel-Turonski, P., Carmignotto, M., Horn, T., Mkrtchyan, H., Asaturyan, A., Mkrtchyan, A., Tadevosyan, V., Zhamkochyan, S., Malbrunot-Ettenauer, S., Eyrich, W., Alfs, D., Glowacz, B., Moskal, P., Zielinski, M., Grzonka, D., Hauenstein, F., Kilian, K., Lersch, D., Ritman, J., Sefzick, T., Oelert, W., Diermaier, M., Widmann, E., Zmeskal, J., Wolke, Magnus, Nadel-Turonski, P., Carmignotto, M., Horn, T., Mkrtchyan, H., Asaturyan, A., Mkrtchyan, A., Tadevosyan, V., Zhamkochyan, S., Malbrunot-Ettenauer, S., and Eyrich, W.

Abstract

The goal of the P349 experiment is to test whether the antiproton production process can be itself a source of antiproton polarization. In this article, we present the motivation and details of the performed measurement. We report on the status of the analysis focusing mainly on calibration of the drift chambers and 3d track reconstruction.

Published
2017
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37. Drift Chamber Calibration and Track Reconstruction in the P349 Antiproton Polarization Experiment

Author

Alfs, D., primary, Głowacz, B., additional, Moskal, P., additional, Zieliński, M., additional, Grzonka, D., additional, Hauenstein, F., additional, Kilian, K., additional, Lersch, D., additional, Ritman, J., additional, Sefzick, T., additional, Oelert, W., additional, Diermaier, M., additional, Widmann, E., additional, Zmeskal, J., additional, Wolke, M., additional, Nadel-Turonski, P., additional, Carmignotto, M., additional, Horn, T., additional, Mkrtchyan, H., additional, Asaturyan, A., additional, Mkrtchyan, A., additional, Tadevosyan, V., additional, Zhamkochyan, S., additional, Malbrunot-Ettenauer, S., additional, and Eyrich, W., additional

Published
2017
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38. Status of the analysis for the search of polarization in the antiproton production process

Author

Alfs, D., Asaturyan, A., Carmignotto, M., Diermaier, M., Eyrich, W., Glowacz, B., Grzonka, D., Hauenstein, F., Horn, T., Kilian, K., Malbrunot-Ettenauer, S., Mkrtchyan, A., Mkrtchyan, H., Moskal, P., Nadel-Turonski, P., Oelert, W., Ritman, J., Sefzick, T., Tadevosyan, V., Widmann, E., Wolke, Magnus, Zhamkochyan, S., Zielinski, M., Zink, A., Zmeskal, J., Alfs, D., Asaturyan, A., Carmignotto, M., Diermaier, M., Eyrich, W., Glowacz, B., Grzonka, D., Hauenstein, F., Horn, T., Kilian, K., Malbrunot-Ettenauer, S., Mkrtchyan, A., Mkrtchyan, H., Moskal, P., Nadel-Turonski, P., Oelert, W., Ritman, J., Sefzick, T., Tadevosyan, V., Widmann, E., Wolke, Magnus, Zhamkochyan, S., Zielinski, M., Zink, A., and Zmeskal, J.

Abstract

The P-349 experiment aims to test whether for antiprotons the production process itself can be a source of polarization in view of the preparation of a polarized antiproton beam. In this article we present the details of performed measurements and report on the status of the ongoing analysis.

Published
2016
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39. Towards measuring the ground state hyperfine splitting of antihydrogen – a progress report

Author

Sauerzopf, C., primary, Capon, A. A., additional, Diermaier, M., additional, Dupré, P., additional, Higashi, Y., additional, Kaga, C., additional, Kolbinger, B., additional, Leali, M., additional, Lehner, S., additional, Rizzini, E. Lodi, additional, Malbrunot, C., additional, Mascagna, V., additional, Massiczek, O., additional, Murtagh, D. J., additional, Nagata, Y., additional, Radics, B., additional, Simon, M. C., additional, Suzuki, K., additional, Tajima, M., additional, Ulmer, S., additional, Vamosi, S., additional, Gorp, S. van, additional, Zmeskal, J., additional, Breuker, H., additional, Higaki, H., additional, Kanai, Y., additional, Kuroda, N., additional, Matsuda, Y., additional, Venturelli, L., additional, Widmann, E., additional, and Yamazaki, Y., additional

Published
2016
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40. The development of the antihydrogen beam detector and the detection of the antihydrogen atoms for in-flight hyperfine spectroscopy

Author

Nagata, Y, primary, Sauerzopf, C, additional, Capon, A, additional, Kuroda, N, additional, Abo, Y, additional, Diermaier, M, additional, Dupre, P, additional, Higashi, Y, additional, Ishikawa, S, additional, Kaga, C, additional, Leali, M, additional, Malbrunot, C, additional, Mascagna, V, additional, Murtagh, D, additional, Radics, B, additional, Simon, M C, additional, Tajima, M, additional, Torii, H A, additional, Van Gorp, S, additional, Zmeskal, J, additional, Breuker, H, additional, Higaki, H, additional, Kanai, Y, additional, Matsuda, Y, additional, Ulmer, S, additional, Venturelli, L, additional, Widmann, E, additional, and Yamazaki, Y, additional

Published
2015
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41. Search for Polarization Effects in the Antiproton Production Process

Author

Grzonka, D., primary, Kilian, K., additional, Ritman, J., additional, Sefzick, T., additional, Oelert, W., additional, Diermaier, M., additional, Widmann, E., additional, Zmeskal, J., additional, Głowacz, B., additional, Moskal, P., additional, Zieliński, M., additional, Wolke, M., additional, Nadel-Turonski, P., additional, Carmignotto, M., additional, Horn, T., additional, Mkrtchyan, H., additional, Asaturyan, A., additional, Mkrtchyan, A., additional, Tadevosyan, V., additional, Zhamkochyan, S., additional, Malbrunot-Ettenauer, S., additional, Eyrich, W., additional, Hauenstein, F., additional, and Zink, A., additional

Published
2015
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42. Spectroscopy apparatus for the measurement of the hyperfine structure of antihydrogen

Author

Malbrunot, C., primary, Caradonna, P., additional, Diermaier, M., additional, Dilaver, N., additional, Friedreich, S., additional, Kolbinger, B., additional, Lehner, S., additional, Lundmark, R., additional, Massiczek, O., additional, Radics, B., additional, Sauerzopf, C., additional, Simon, M., additional, Widmann, E., additional, Wolf, M., additional, Wünschek, B., additional, and Zmeskal, J., additional

Published
2014
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43. A source of antihydrogen for in-flight hyperfine spectroscopy

Author

Kuroda, N., primary, Ulmer, S., additional, Murtagh, D. J., additional, Van Gorp, S., additional, Nagata, Y., additional, Diermaier, M., additional, Federmann, S., additional, Leali, M., additional, Malbrunot, C., additional, Mascagna, V., additional, Massiczek, O., additional, Michishio, K., additional, Mizutani, T., additional, Mohri, A., additional, Nagahama, H., additional, Ohtsuka, M., additional, Radics, B., additional, Sakurai, S., additional, Sauerzopf, C., additional, Suzuki, K., additional, Tajima, M., additional, Torii, H. A., additional, Venturelli, L., additional, Wu¨nschek, B., additional, Zmeskal, J., additional, Zurlo, N., additional, Higaki, H., additional, Kanai, Y., additional, Lodi Rizzini, E., additional, Nagashima, Y., additional, Matsuda, Y., additional, Widmann, E., additional, and Yamazaki, Y., additional

Published
2014
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