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Conference Paper/Proceeding/Abstract 973 views

Trapped antihydrogen

E Butler, G. B Andresen, M. D Ashkezari, M Baquero-Ruiz, W Bertsche, P. D Bowe, C. L Cesar, S Chapman, M Charlton, A Deller, S Eriksson, J Fajans, T Friesen, M. C Fujiwara, D. R Gill, A Gutierrez, J. S Hangst, W. N Hardy, M. E Hayden, A. J Humphries, R Hydomako, M. J Jenkins, S Jonsell, L. V Jørgensen, S. L Kemp, L Kurchaninov, N Madsen, S Menary, P Nolan, K Olchanski, A Olin, A Povilus, P Pusa, C. Ø Rasmussen, F Robicheaux, E Sarid, S. Seif el Nasr, D. M Silveira, C So, J. W Storey, R. I Thompson, D. P Werf, J. S Wurtele, Y Yamazaki, Niels Madsen Orcid Logo

LEAP 2011, Pages: 15 - 29

Swansea University Author: Niels Madsen Orcid Logo

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DOI (Published version): 10.1007/978-94-007-5530-7_3

Abstract

Precision spectroscopic comparison of hydrogen and antihydrogen holds the promise of a sensitive test of the Charge-Parity-Time theorem and matter-antimatter equivalence. The clearest path towards realising this goal is to hold a sample of antihydrogen in an atomic trap for interrogation by electrom...

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Published in: LEAP 2011
Published: Vancouver Springer 2013
URI: https://cronfa.swan.ac.uk/Record/cronfa15092
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last_indexed 2018-02-09T04:46:48Z
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Achieving this poses a huge experimental challenge, as state-of-the-art magnetic-minimum atom traps have well depths of only &#x2DC;1 T (&#x2DC;0.5 K for ground state antihydrogen atoms). The atoms annihilate on contact with matter and must be `born' inside the magnetic trap with low kinetic energies. At the ALPHA experiment, antihydrogen atoms are produced from antiprotons and positrons stored in the form of non-neutral plasmas, where the typical electrostatic potential energy per particle is on the order of electronvolts, more than 104 times the maximum trappable kinetic energy. In November 2010, ALPHA published the observation of 38 antiproton annihilations due to antihydrogen atoms that had been trapped for at least 172 ms and then released&#x2014;the first instance of a purely antimatter atomic system confined for any length of time (Andresen et al., Nature 468:673, 2010). We present a description of the main components of the ALPHA traps and detectors that were key to realising this result. We discuss how the antihydrogen atoms were identified and how they were discriminated from the background processes. Since the results published in Andresen et al. (Nature 468:673, 2010), refinements in the antihydrogen production technique have allowed many more antihydrogen atoms to be trapped, and held for much longer times. We have identified antihydrogen atoms that have been trapped for at least 1,000 s in the apparatus (Andresen et al., Nature Physics 7:558, 2011). 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spelling 2013-06-18T09:47:19.6282100 v2 15092 2013-06-14 Trapped antihydrogen e348e4d768ee19c1d0c68ce3a66d6303 0000-0002-7372-0784 Niels Madsen Niels Madsen true false 2013-06-14 BGPS Precision spectroscopic comparison of hydrogen and antihydrogen holds the promise of a sensitive test of the Charge-Parity-Time theorem and matter-antimatter equivalence. The clearest path towards realising this goal is to hold a sample of antihydrogen in an atomic trap for interrogation by electromagnetic radiation. Achieving this poses a huge experimental challenge, as state-of-the-art magnetic-minimum atom traps have well depths of only ˜1 T (˜0.5 K for ground state antihydrogen atoms). The atoms annihilate on contact with matter and must be `born' inside the magnetic trap with low kinetic energies. At the ALPHA experiment, antihydrogen atoms are produced from antiprotons and positrons stored in the form of non-neutral plasmas, where the typical electrostatic potential energy per particle is on the order of electronvolts, more than 104 times the maximum trappable kinetic energy. In November 2010, ALPHA published the observation of 38 antiproton annihilations due to antihydrogen atoms that had been trapped for at least 172 ms and then released—the first instance of a purely antimatter atomic system confined for any length of time (Andresen et al., Nature 468:673, 2010). We present a description of the main components of the ALPHA traps and detectors that were key to realising this result. We discuss how the antihydrogen atoms were identified and how they were discriminated from the background processes. Since the results published in Andresen et al. (Nature 468:673, 2010), refinements in the antihydrogen production technique have allowed many more antihydrogen atoms to be trapped, and held for much longer times. We have identified antihydrogen atoms that have been trapped for at least 1,000 s in the apparatus (Andresen et al., Nature Physics 7:558, 2011). This is more than sufficient time to interrogate the atoms spectroscopically, as well as to ensure that they have relaxed to their ground state. Conference Paper/Proceeding/Abstract LEAP 2011 15 29 Springer Vancouver 31 12 2013 2013-12-31 10.1007/978-94-007-5530-7_3 COLLEGE NANME Biosciences Geography and Physics School COLLEGE CODE BGPS Swansea University 2013-06-18T09:47:19.6282100 2013-06-14T13:08:07.8575283 Faculty of Science and Engineering School of Biosciences, Geography and Physics - Physics E Butler 1 G. B Andresen 2 M. D Ashkezari 3 M Baquero-Ruiz 4 W Bertsche 5 P. D Bowe 6 C. L Cesar 7 S Chapman 8 M Charlton 9 A Deller 10 S Eriksson 11 J Fajans 12 T Friesen 13 M. C Fujiwara 14 D. R Gill 15 A Gutierrez 16 J. S Hangst 17 W. N Hardy 18 M. E Hayden 19 A. J Humphries 20 R Hydomako 21 M. J Jenkins 22 S Jonsell 23 L. V Jørgensen 24 S. L Kemp 25 L Kurchaninov 26 N Madsen 27 S Menary 28 P Nolan 29 K Olchanski 30 A Olin 31 A Povilus 32 P Pusa 33 C. Ø Rasmussen 34 F Robicheaux 35 E Sarid 36 S. Seif el Nasr 37 D. M Silveira 38 C So 39 J. W Storey 40 R. I Thompson 41 D. P Werf 42 J. S Wurtele 43 Y Yamazaki 44 Niels Madsen 0000-0002-7372-0784 45
title Trapped antihydrogen
spellingShingle Trapped antihydrogen
Niels Madsen
title_short Trapped antihydrogen
title_full Trapped antihydrogen
title_fullStr Trapped antihydrogen
title_full_unstemmed Trapped antihydrogen
title_sort Trapped antihydrogen
author_id_str_mv e348e4d768ee19c1d0c68ce3a66d6303
author_id_fullname_str_mv e348e4d768ee19c1d0c68ce3a66d6303_***_Niels Madsen
author Niels Madsen
author2 E Butler
G. B Andresen
M. D Ashkezari
M Baquero-Ruiz
W Bertsche
P. D Bowe
C. L Cesar
S Chapman
M Charlton
A Deller
S Eriksson
J Fajans
T Friesen
M. C Fujiwara
D. R Gill
A Gutierrez
J. S Hangst
W. N Hardy
M. E Hayden
A. J Humphries
R Hydomako
M. J Jenkins
S Jonsell
L. V Jørgensen
S. L Kemp
L Kurchaninov
N Madsen
S Menary
P Nolan
K Olchanski
A Olin
A Povilus
P Pusa
C. Ø Rasmussen
F Robicheaux
E Sarid
S. Seif el Nasr
D. M Silveira
C So
J. W Storey
R. I Thompson
D. P Werf
J. S Wurtele
Y Yamazaki
Niels Madsen
format Conference Paper/Proceeding/Abstract
container_title LEAP 2011
container_start_page 15
publishDate 2013
institution Swansea University
doi_str_mv 10.1007/978-94-007-5530-7_3
publisher Springer
college_str Faculty of Science and Engineering
hierarchytype
hierarchy_top_id facultyofscienceandengineering
hierarchy_top_title Faculty of Science and Engineering
hierarchy_parent_id facultyofscienceandengineering
hierarchy_parent_title Faculty of Science and Engineering
department_str School of Biosciences, Geography and Physics - Physics{{{_:::_}}}Faculty of Science and Engineering{{{_:::_}}}School of Biosciences, Geography and Physics - Physics
document_store_str 0
active_str 0
description Precision spectroscopic comparison of hydrogen and antihydrogen holds the promise of a sensitive test of the Charge-Parity-Time theorem and matter-antimatter equivalence. The clearest path towards realising this goal is to hold a sample of antihydrogen in an atomic trap for interrogation by electromagnetic radiation. Achieving this poses a huge experimental challenge, as state-of-the-art magnetic-minimum atom traps have well depths of only ˜1 T (˜0.5 K for ground state antihydrogen atoms). The atoms annihilate on contact with matter and must be `born' inside the magnetic trap with low kinetic energies. At the ALPHA experiment, antihydrogen atoms are produced from antiprotons and positrons stored in the form of non-neutral plasmas, where the typical electrostatic potential energy per particle is on the order of electronvolts, more than 104 times the maximum trappable kinetic energy. In November 2010, ALPHA published the observation of 38 antiproton annihilations due to antihydrogen atoms that had been trapped for at least 172 ms and then released—the first instance of a purely antimatter atomic system confined for any length of time (Andresen et al., Nature 468:673, 2010). We present a description of the main components of the ALPHA traps and detectors that were key to realising this result. We discuss how the antihydrogen atoms were identified and how they were discriminated from the background processes. Since the results published in Andresen et al. (Nature 468:673, 2010), refinements in the antihydrogen production technique have allowed many more antihydrogen atoms to be trapped, and held for much longer times. We have identified antihydrogen atoms that have been trapped for at least 1,000 s in the apparatus (Andresen et al., Nature Physics 7:558, 2011). This is more than sufficient time to interrogate the atoms spectroscopically, as well as to ensure that they have relaxed to their ground state.
published_date 2013-12-31T12:31:14Z
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score 11.048194

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