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18 results on '"Bertsche A"'

1. Investigation of two-frequency Paul traps for antihydrogen production

Author

Leefer, Nathan, Krimmel, Kai, Bertsche, William, Budker, Dmitry, Fajans, Joel, Folman, Ron, Häffner, Hartmut, and Schmidt-Kaler, Ferdinand

Subjects
Atomic physics, Paul trap, Two-frequency, Ion traps, Antihydrogen, physics.atom-ph, hep-ex, physics.plasm-ph, Atomic, Molecular, Nuclear, Particle and Plasma Physics, Condensed Matter Physics, General Physics
Abstract

Radio-frequency (rf) Paul traps operated with multifrequency rf trapping potentials provide the ability to independently confine charged particle species with widely different charge-to-mass ratios. In particular, these traps may find use in the field of antihydrogen recombination, allowing antiproton and positron clouds to be trapped and confined in the same volume without the use of large superconducting magnets. We explore the stability regions of two-frequency Paul traps and perform numerical simulations of small samples of multispecies charged-particle mixtures of up to twelve particles that indicate the promise of these traps for antihydrogen recombination.

Published
2017

2. Limit on the electric charge of antihydrogen

Author

Capra, A., Amole, C., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Butler, E., Cesar, C. L., Charlton, M., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M. C., Gill, D. R., Gutierrez, A., Hangst, J. S., Hardy, W. N., Hayden, M. E., Isaac, C. A., Jonsell, S., Kurchaninov, L., Little, A., K. McKenna, J. T., Menary, S., Napoli, S. C., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Silveira, D. M., So, C., Tharp, T. D., Thompson, R. I., van der Werf, D. P., Vendeiro, Z., Wurtele, J. S., Zhmoginov, A. I., and Charman, A. E.

Published
2017
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3. Antiproton cloud compression in the ALPHA apparatus at CERN

Author

Gutierrez, A., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Burrows, C., Butler, E., Capra, A., Cesar, C. L., Charlton, M., Dunlop, R., Eriksson, S., Evetts, N., Fajans, J., Friesen, T., Fujiwara, M. C., Gill, D. R., Hangst, J. S., Hardy, W. N., Hayden, M. E., Isaac, C. A., Jonsell, S., Kurchaninov, L., Little, A., Madsen, N., K. McKenna, J. T., Menary, S., Napoli, S. C., Nolan, P., Olchanski, K., Olin, A., Pusa, P., Rasmussen, C. Ø., Robicheaux, F., Sacramento, R. L., Sarid, E., Silveira, D. M., So, C., Stracka, S., Tarlton, J., Tharp, T. D., Thompson, R. I., Tooley, P., Turner, M., van der Werf, D. P., Wurtele, J. S., and Zhmoginov, A. I.

Published
2015
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4. Microwave-plasma interactions studied via mode diagnostics in ALPHA

Author

Friesen, T., Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Eriksson, S., Fajans, J., Fujiwara, M. C., Gill, D. R., Gutierrez, A., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hydomako, R., Jonsell, S., Kurchaninov, L., Madsen, N., Menary, S., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Silveira, D. M., So, C., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wurtele, J. S., Yamazaki, Y., and ALPHA Collaboration

Published
2012
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5. Trapped antihydrogen

Author

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

Published
2012
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6. Progress towards microwave spectroscopy of trapped antihydrogen

Author

Ashkezari, Mohammad D., Andresen, Gorm B., Baquero-Ruiz, Marcelo, Bertsche, Wil, Bowe, Paul D., Butler, Eoin, Cesar, Claudio L., Chapman, Steve, Charlton, Michael, Deller, Adam, Eriksson, Stefan, Fajans, Joel, Friesen, Tim, Fujiwara, Makoto C., Gill, Dave R., Gutierrez, Andrea, Hangst, Jeffrey S., Hardy, Walter N., Hayano, Ryugo S., Hayden, Michael E., Humphries, Andrew J., Hydomako, Richard, Jonsell, Svante, Kurchaninov, Lenoid, Madsen, Niels, Menary, Scott, Nolan, Paul, Olchanski, Konstantin, Olin, Art, Povilus, Alex, Pusa, Petteri, Robicheaux, Francis, Sarid, Eli, Silveira, Daniel M., So, Chukman, Storey, James W., Thompson, Robert I., van der Werf, Dirk P., Wurtele, Jonathan S., Yamazaki, Yasunori, and ALPHA Collaboration

Published
2012
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7. Antihydrogen detection in ALPHA

Author

Hydomako, Richard, Andresen, Gorm Bruun, Ashkezari, Mohammad Dehghani, Baquero-Ruiz, Marcelo, Bertsche, William, Butler, Eoin, Bowe, Paul David, Cesar, Claudo Lenz, Chapman, Steve, Charlton, Michael, Fajans, Joel, Friesen, Tim, Fujiwara, Makoto C., Gill, David Russell, Hangst, Jeffrey Scott, Hardy, Walter Newbold, Hayano, Ryugo S., Hayden, Michael Edward, Humphries, Andrew James, Jonsell, Svante, Kurchaninov, Leonid, Madsen, Niels, Menary, Scott, Nolan, Paul, Olchanski, Konstantin, Olin, Arthur, Povilus, Alexander, Pusa, Petteri, Robicheaux, Francis, Sarid, Elazar, Silveira, Daniel Miranda, So, Chukman, Storey, James William, Thompson, Robert Ian, van der Werf, Dirk Peter, Wurtele, Jonathan Syrkin, Yamazaki, Yasunori, and ALPHA Collaboration

Published
2012
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8. Alternative method for reconstruction of antihydrogen annihilation vertices

Author

Amole, C., Ashkezari, M. D., Andresen, G. B., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Deller, A., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M. C., Gill, D. R., Gutierrez, A., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hydomako, R., Jonsell, S., Kurchaninov, L., Madsen, N., Menary, S., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Silveira, D. M., So, C., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wurtele, J. S., Yamazaki, Y., and ALPHA Collaboration

Published
2012
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9. Antihydrogen formation by autoresonant excitation of antiproton plasmas

Author

Bertsche, William Alan, Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bowe, P. D., Carpenter, P. T., Butler, E., Cesar, C. L., Chapman, S. F., Charlton, M., Eriksson, S., Fajans, J., Friesen, T., Fujiwara, M. C., Gill, D. R., Gutierrez, A., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hurt, J. L., Hydomako, R., Jonsell, S., Kurchaninov, L., Madsen, N., Menary, S., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Silveira, D. M., So, C., Storey, J. W., Thompson, R. I., Werf, D. P. van der, Wurtele, J. S., Yamazaki, Y., and ALPHA Collaboration

Published
2012
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10. Towards antihydrogen trapping and spectroscopy at ALPHA

Author

Butler, E., Andresen, G. B., Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, P. D., Bray, C. C., Cesar, C. L., Chapman, S., Charlton, M., Fajans, J., Friesen, T., Fujiwara, M. C., Gill, D. R., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hydomako, R., Jonsell, S., Kurchaninov, L., Lambo, R., Madsen, N., Menary, S., Nolan, P., Olchanski, K., Olin, A., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Silveira, D. M., So, C., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wilding, D., Wurtele, J. S., Yamazaki, Y., and ALPHA Collaboration

Published
2011
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11. Towards antihydrogen confinement with the ALPHA antihydrogen trap

Author

Fujiwara, M. C., Andresen, G., Bertsche, W., Boston, A., Bowe, P. D., Cesar, C. L., Chapman, S., Charlton, M., Chartier, M., Deutsch, A., Fajans, J., Funakoshi, R., Gill, D. R., Gomberoff, K., Hangst, J. S., Hardy, W. N., Hayano, R. S., Hydomako, R., Jenkins, M. J., Jørgensen, L. V., Kurchaninov, L., Madsen, N., Nolan, P., Olchanski, K., Olin, A., Page, R. D., Povilus, A., Robicheaux, F., Sarid, E., Silveira, D. M., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wurtele, J. S., and Yamazaki, Y.

Published
2006
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12. Antihydrogen detection in ALPHA

Author

A. Olin, William Bertsche, E. Sarid, P. J. Nolan, M. C. Fujiwara, Richard Hydomako, Niels Madsen, Eoin Butler, Robert Thompson, A. Povilus, M. E. Hayden, Claudo Lenz Cesar, M. D. Ashkezari, Leonid Kurchaninov, M. Charlton, K. Olchanski, Marcelo Baquero-Ruiz, Francis Robicheaux, Steve Chapman, D. R. Gill, Jonathan Wurtele, J. S. Hangst, A. J. Humphries, P. D. Bowe, W. N. Hardy, Svante Jonsell, Petteri Pusa, S. Menary, T. Friesen, Dirk Peter van der Werf, Chukman So, Gorm Bruun Andresen, D. M. Silveira, James William Storey, Ryugo S. Hayano, Yasunori Yamazaki, and Joel Fajans

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Annihilation, Large Hadron Collider, Physics::Instrumentation and Detectors, Detector, Condensed Matter Physics, Tracking (particle physics), Atomic and Molecular Physics, and Optics, Nuclear physics, Trapping region, Physics::Atomic Physics, Physical and Theoretical Chemistry, Antihydrogen, Image resolution, Event reconstruction
Abstract

The ALPHA project is an international collaboration, based at CERN, with the experimental goal of performing precision spectroscopic measurements on antihydrogen. As part of this endeavor, the ALPHA experiment includes a silicon tracking detector. This detector consists of a three-layer array of silicon modules surrounding the antihydrogen trapping region of the ALPHA apparatus. Using this device, the antihydrogen annihilation position can be determined with a spatial resolution of better than 5 mm. Knowledge of the annihilation distribution was a critical component in the recently successful antihydrogen trapping effort. This paper will describe the methods used to reconstruct annihilation events in the ALPHA detector. Particular attention will be given to the description of the background rejection criteria.

Published
2011

13. Progress towards microwave spectroscopy of trapped antihydrogen

Author

Yasunori Yamazaki, Ryugo S. Hayano, Lenoid Kurchaninov, A. Povilus, A. Olin, Richard Hydomako, K. Olchanski, Joel Fajans, M. C. Fujiwara, Niels Madsen, M. D. Ashkezari, Robert Thompson, Adam Deller, J. S. Hangst, Wil Bertsche, M. Charlton, Eoin Butler, T. Friesen, D. M. Silveira, Dirk Peter van der Werf, Stefan Eriksson, James William Storey, Jonathan Wurtele, E. Sarid, P. J. Nolan, Francis Robicheaux, P. D. Bowe, Michael E. Hayden, Walter Hardy, S. Menary, Steve Chapman, C. L. Cesar, Gorm Bruun Andresen, Chukman So, Dave R. Gill, Marcelo Baquero-Ruiz, Andrea Gutierrez, Petteri Pusa, A. J. Humphries, and Svante Jonsell

Subjects
Physics, Nuclear and High Energy Physics, Hydrogen, CPT symmetry, chemistry.chemical_element, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Nuclear physics, chemistry, Atom, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics, Rotational spectroscopy, Physical and Theoretical Chemistry, Atomic physics, Antihydrogen, Hyperfine structure, Microwave
Abstract

Precision comparisons of hyperfine intervals in atomic hydrogen and antihydrogen are expected to yield experimental tests of the CPT theorem. The CERN-based ALPHA collaboration has initiated a program of study focused on microwave spectroscopy of trapped ground-state antihydrogen atoms. This paper outlines some of the proposed experiments, and summarizes measurements that characterize microwave fields that have been injected into the ALPHA apparatus.

Published
2011

14. Trapped antihydrogen

Author

D. R. Gill, Michael E. Hayden, Marcelo Baquero-Ruiz, Andrea Gutierrez, Petteri Pusa, P. J. Nolan, Yasunori Yamazaki, K. Olchanski, Robert Thompson, M. J. Jenkins, M. D. Ashkezari, Leonid Kurchaninov, William Bertsche, Richard Hydomako, M. Charlton, P. D. Bowe, Eoin Butler, A. J. Humphries, Jonathan Wurtele, J. S. Hangst, L. V. Jørgensen, S. Seif El Nasr, Joel Fajans, A. Deller, S. L. Kemp, Svante Jonsell, A. Povilus, A. Olin, D. P. van der Werf, Francis Robicheaux, James William Storey, C. Ø. Rasmussen, Niels Madsen, D. M. Silveira, Stefan Eriksson, Walter Hardy, C. L. Cesar, Gorm Bruun Andresen, T. Friesen, Scott Chapman, M. C. Fujiwara, S. Menary, Chukman So, and E. Sarid

Subjects
Condensed Matter::Quantum Gases, Physics, Nuclear and High Energy Physics, Electronvolt, Plasma, Condensed Matter Physics, Atomic and Molecular Physics, and Optics, Antiproton, Magnetic trap, Antimatter, Atom, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics, Physical and Theoretical Chemistry, Atomic physics, Ground state, Antihydrogen
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 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
2011

15. Antihydrogen formation by autoresonant excitation of antiproton plasmas

Author

T. Friesen, Marcelo Baquero-Ruiz, Andrea Gutierrez, P. J. Nolan, Michael E. Hayden, Robert Thompson, A. Povilus, J. S. Hangst, K. Olchanski, Francis Robicheaux, M. D. Ashkezari, Leonid Kurchaninov, P. T. Carpenter, J. L. Hurt, D. P. van der Werf, Niels Madsen, M. Charlton, Richard Hydomako, D. R. Gill, S. Menary, Jonathan Wurtele, P. D. Bowe, James William Storey, Chukman So, D. M. Silveira, Steve Chapman, William Bertsche, E. Sarid, Stefan Eriksson, Ryugo S. Hayano, A. Olin, Eoin Butler, Walter Hardy, A. J. Humphries, Svante Jonsell, Yasunori Yamazaki, Petteri Pusa, Joel Fajans, M. C. Fujiwara, C. L. Cesar, and Gorm Bruun Andresen

Subjects
Physics, Nuclear and High Energy Physics, Plasma, Condensed Matter Physics, Kinetic energy, Space charge, Atomic and Molecular Physics, and Optics, Charged particle, Nuclear physics, Physics::Plasma Physics, Antiproton, Excited state, Physics::Atomic Physics, Physical and Theoretical Chemistry, Atomic physics, Antihydrogen, Excitation
Abstract

In efforts to trap antihydrogen, a key problem is the vast disparity between the neutral trap energy scale (\(\sim\!50\,\upmu\mathrm{eV}\)), and the energy scales associated with plasma confinement and space charge (~1 eV). In order to merge charged particle species for direct recombination, the larger energy scale must be overcome in a manner that minimizes the initial antihydrogen kinetic energy. This issue motivated the development of a novel injection technique utilizing the inherent nonlinear nature of particle oscillations in our traps. We demonstrated controllable excitation of the center-of-mass longitudinal motion of a thermal antiproton plasma using a swept-frequency autoresonant drive. When the plasma is cold, dense and highly collective in nature, we observe that the entire system behaves as a single-particle nonlinear oscillator, as predicted by a recent theory. In contrast, only a fraction of the antiprotons in a warm or tenuous plasma can be similarly excited. Antihydrogen was produced and trapped by using this technique to drive antiprotons into a positron plasma, thereby initiating atomic recombination. The nature of this injection overcomes some of the difficulties associated with matching the energies of the charged species used to produce antihydrogen.

Published
2011

16. Towards antihydrogen trapping and spectroscopy at ALPHA

Author

R. Lambo, Dean Wilding, Niels Madsen, M. D. Ashkezari, Ruyugo S. Hayano, A. J. Humphries, J. S. Hangst, Leonid Kurchaninov, William Bertsche, K. Olchanski, Yasunori Yamazaki, Svante Jonsell, M. Charlton, Walter Hardy, Jonathan Wurtele, Michael E. Hayden, Marcelo Baquero-Ruiz, S. Menary, M. C. Fujiwara, C. C. Bray, Eoin Butler, A. Povilus, Joel Fajans, Chukman So, Richard Hydomako, E. Sarid, T. Friesen, Dirk Peter van der Werf, C. L. Cesar, Gorm Bruun Andresen, Petteri Pusa, Francis Robicheaux, James William Storey, A. Olin, P. J. Nolan, D. R. Gill, P. D. Bowe, Steven Chapman, D. M. Silveira, and Robert Thompson

Subjects
Physics::General Physics, Nuclear and High Energy Physics, Atomic Physics (physics.atom-ph), CPT symmetry, Other Fields of Physics, Measure (physics), FOS: Physical sciences, 7. Clean energy, 01 natural sciences, Physics - Atomic Physics, High Energy Physics - Experiment, 010305 fluids & plasmas, Nuclear physics, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics, Physical and Theoretical Chemistry, 010306 general physics, Spectroscopy, Antihydrogen, Condensed Matter::Quantum Gases, Physics, Annihilation, Large Hadron Collider, Condensed Matter Physics, Physics - Plasma Physics, Atomic and Molecular Physics, and Optics, Plasma Physics (physics.plasm-ph), Antiproton Decelerator, Antiproton, High Energy Physics::Experiment, Atomic physics
Abstract

Spectroscopy of antihydrogen has the potential to yield high-precision tests of the CPT theorem and shed light on the matter-antimatter imbalance in the Universe. The ALPHA antihydrogen trap at CERN's Antiproton Decelerator aims to prepare a sample of antihydrogen atoms confined in an octupole-based Ioffe trap and to measure the frequency of several atomic transitions. We describe our techniques to directly measure the antiproton temperature and a new technique to cool them to below 10 K. We also show how our unique position-sensitive annihilation detector provides us with a highly sensitive method of identifying antiproton annihilations and effectively rejecting the cosmic-ray background., 10 pages, 5 figures

Published
2011

18. Limit on the electric charge of antihydrogen

Author

Capra, A., primary, Amole, C., additional, Ashkezari, M. D., additional, Baquero-Ruiz, M., additional, Bertsche, W., additional, Butler, E., additional, Cesar, C. L., additional, Charlton, M., additional, Eriksson, S., additional, Fajans, J., additional, Friesen, T., additional, Fujiwara, M. C., additional, Gill, D. R., additional, Gutierrez, A., additional, Hangst, J. S., additional, Hardy, W. N., additional, Hayden, M. E., additional, Isaac, C. A., additional, Jonsell, S., additional, Kurchaninov, L., additional, Little, A., additional, K. McKenna, J. T., additional, Menary, S., additional, Napoli, S. C., additional, Nolan, P., additional, Olchanski, K., additional, Olin, A., additional, Povilus, A., additional, Pusa, P., additional, Robicheaux, F., additional, Sarid, E., additional, Silveira, D. M., additional, So, C., additional, Tharp, T. D., additional, Thompson, R. I., additional, van der Werf, D. P., additional, Vendeiro, Z., additional, Wurtele, J. S., additional, Zhmoginov, A. I., additional, and Charman, A. E., additional

Published
2016
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