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19 results on '"Hangst, Jeffrey S."'

1. Towards Antihydrogen Trapping and Spectroscopy at ALPHA

Author

Butler, Eoin, Andresen, Gorm. B., Ashkezari, Mohammad. D., Baquero-Ruiz, Marcelo, Bertsche, William, Bowe, Paul D., Bray, Crystal C., Cesar, Claudio L., Chapman, Steven, Charlton, Michael, Fajans, Joel, Friesen, Tim, Fujiwara, Makoto C., Gill, David R., Hangst, Jeffrey S., Hardy, Walter N., Hayano, Ruyugo S., Hayden, Michael E., Humphries, Andrew J., Hydomako, Richard, Jonsell, Svante, Kurchaninov, Leonid, Lambo, Ricardo, Madsen, Niels, Menary, Scott, Nolan, Paul, Olchanski, Konstantin, Olin, Art, Povilus, Alexander, Pusa, Petteri, Robicheaux, Francis, Sarid, Eli, Silveira, Daniel M., So, Chukman, Storey, James W., Thompson, Robert I., van der Werf, Dirk P., Wilding, Dean, Wurtele, Jonathan S., and Yamazaki, Yasunori

Subjects
Physics - Atomic Physics, High Energy Physics - Experiment, Physics - Plasma 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., Comment: 10 pages, 5 figures

Published
2011
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2. Search For Trapped Antihydrogen

Author

Andresen, Gorm B., Ashkezari, Mohammad D., Baquero-Ruiz, Marcelo, Bertsche, William, Bowe, Paul D., Bray, Crystal C., Butler, Eoin, Cesar, Claudio L., Chapman, Steven, Charlton, Michael, Fajans, Joel, Friesen, Tim, Fujiwara, Makoto C., Gill, David R., Hangst, Jeffrey S., Hardy, Walter N., Hayano, Ryugo S., Hayden, Michael E., Humphries, Andrew J., Hydomako, Richard, Jonsell, Svante, Jørgensen, Lars V., Kurchaninov, Lenoid, Lambo, Ricardo, Madsen, Niels, Menary, Scott, Nolan, Paul, Olchanski, Konstantin, Olin, Art, Povilus, Alexander, Pusa, Petteri, Robicheaux, Francis, Sarid, Eli, Nasr, Sarah Seif El, Silveira, Daniel M., So, Chukman, Storey, James W., Thompson, Robert I., van der Werf, Dirk P., Wilding, Dean, Wurtele, Jonathan S., and Yamazaki, Yasunori

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

We present the results of an experiment to search for trapped antihydrogen atoms with the ALPHA antihydrogen trap at the CERN Antiproton Decelerator. Sensitive diagnostics of the temperatures, sizes, and densities of the trapped antiproton and positron plasmas have been developed, which in turn permitted development of techniques to precisely and reproducibly control the initial experimental parameters. The use of a position-sensitive annihilation vertex detector, together with the capability of controllably quenching the superconducting magnetic minimum trap, enabled us to carry out a high-sensitivity and low-background search for trapped synthesised antihydrogen atoms. We aim to identify the annihilations of antihydrogen atoms held for at least 130 ms in the trap before being released over ~30 ms. After a three-week experimental run in 2009 involving mixing of 10^7 antiprotons with 1.3 10^9 positrons to produce 6 10^5 antihydrogen atoms, we have identified six antiproton annihilation events that are consistent with the release of trapped antihydrogen. The cosmic ray background, estimated to contribute 0.14 counts, is incompatible with this observation at a significance of 5.6 sigma. Extensive simulations predict that an alternative source of annihilations, the escape of mirror-trapped antiprotons, is highly unlikely, though this possibility has not yet been ruled out experimentally., Comment: 12 pages, 7 figures

Published
2010
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4. 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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5. Addendum to the ALPHA Proposal; The ALPHA-g Apparatus

Author

Hangst, Jeffrey S

Subjects
Physics::General Physics, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics, Detectors and Experimental Techniques
Abstract

We propose to construct an extension to the ALPHA-2 apparatus. The purpose of this extension is to study the gravitational behaviour of antihydrogen atoms in the field of the Earth.

Published
2016

6. Fundamental Tests of Physics with Antihydrogen at ALPHA

Author

Miranda, Daniel, primary, Cesar, Claudio L., additional, Sacramento, Rodrigo L., additional, Ahmadi, Mostafa, additional, Nolan, Paul, additional, Pusa, Petteri, additional, Baquero-Ruiz, Marcelo, additional, Carruth, Celeste, additional, Charman, Andrew, additional, Evans, Lenny, additional, Fajans, Joel, additional, Povilus, Alex, additional, So, Chukman, additional, Wurtele, Jonathan, additional, Zhmoginov, Andrey, additional, Bertsche, William, additional, Butler, Eoin, additional, Ishida, Akira, additional, Capra, Andrea, additional, Menary, Scott, additional, Charlton, Michael, additional, Eriksson, Stefan, additional, Isaac, Christopher, additional, Jones, Steve, additional, Madsen, Niels, additional, Maxwell, Daniel, additional, Sameed, Muhammed, additional, van der Werf, Dirk, additional, Evetts, Nathan, additional, Gutierrez, Andrea, additional, Hardy, Walter, additional, Friesen, Tim, additional, Hangst, Jeffrey S., additional, Rasmussen, Chris O., additional, Tharp, Timothy D., additional, Fujiwara, Makoto, additional, Gill, David, additional, Kurchaninov, Leonid, additional, Mckenna, Joseph, additional, Michan, Juan M., additional, Olchanski, Konstantin, additional, Olin, Art, additional, Hayden, Michael, additional, Munich, Justine J., additional, Jonsell, Svante, additional, Momose, Takamasa, additional, Robicheaux, Francis, additional, Sarid, Eli, additional, and Thompson, Robert I., additional

Published
2016
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7. Towards antihydrogen trapping and spectroscopy at ALPHA:Proceedings of the 5th International Conference on Trapped Charged Particles and Fundamental Physics (TCP 2010

Author

Butler, E., Bruun Andresen, Gorm, Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, Paul David, Bray, C. C., Cesar, C. L., Chapman, S., Charlton, M., Fajans, J., Friesen, T., Fujiwara, M. C., Gill, D. R., Hangst, Jeffrey 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., Seif el Nasr, S., Silveira, D. M., So, C., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wilding, D., Wurtele, J. S., and Yamazaki, Y.

Published
2011

8. Antiparticle sources for antihydrogen production and trapping

Author

Charlton, M., Bruun Andresen, Gorm, Ashkezari, M. D., Baquero-Ruiz, M., Bertsche, W., Bowe, Paul David, Bray, C.C., Butler, E., Chapman, S., Friesen, T., Fujiwara, M.C., Gill, D.R., Hangst, Jeffrey S., Hardy, W.N., Hayano, R.S., Hayden, M.E., Humphries, A.J., Hydomako, R., Jonsell, S., Jørgensen, L.V., Kerrigan, S.J., Kurchaninov, L., Lambo, R., Madsen, N., Menary, S., Nolan, P., Olchanski, K., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Seif El Nasr, S., Silveira, D.M., So, C., Storey, J.W., Thompson, R.I., Van Der Werf, D.P., Wilding, D., Wurtele, J.S., and Yamazaki, Y.

Subjects
Physics::General Physics, Physics::Atomic and Molecular Clusters, Physics::Accelerator Physics, High Energy Physics::Experiment, Physics::Atomic Physics
Abstract

Sources of positrons and antiprotons that are currently used for the formationof antihydrogen with low kinetic energies are reviewed, mostly in the context of the ALPHA collaboration and its predecessor ATHENA. The experiments were undertaken at the Antiproton Decelerator facility, which is located at CERN. Operations performed on the clouds of antiparticles to facilitate their mixing to produce antihydrogen are described. These include accumulation, cooling and manipulation. The formation of antihydrogen and some of the characteristics of the anti-atoms that are created are discussed. Prospects for trapping antihydrogen in a magnetic minimum trap, as envisaged by the ALPHA collaboration, are reviewed.

Published
2011

9. Antihydrogen Physics at ALPHA/CERN

Author

Cesar, C.L., Andresen, Gorm, Bertsche, W., Bowe, Paul David, Bray, C.C., Butler, E., Chapman, S., Charlton, M., Fajans, J., Fujiwari, M.C., Funakoshi, R., Gill, D.R., Hangst, Jeffrey S., Hardy, W.N., Jenkins, M.J., Jørgensen, L.V., Kurchaninov, L., Lambo, R., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., El Nasr, S.S., Silveira, D.M., Storey, J.W., Thompson, R.I., van der Werf, D.P., Wurtele, J.S., and Yamazaki, Y.

Published
2009

10. Towards trapped antihydrogen

Author

Jørgensen, L. V., Andresen, Gorm, Bertsche, W., Boston, A., Bowe, Paul David, Cesar, C. L., Chapman, S., Charlton, M., Fajans, J., Fujiwara, M. C., Funakoshi, R., Gill, D. R., Hangst, Jeffrey S., Hayano, R. S., Hydomako, R., Jenkins, M. J., 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., Yamazaki, Y., and Collaboration, ALPHA

Published
2008

11. First attempts at antihydrogen trapping in ALPHA

Author

Andresen, Gorm, Bertsche, W., Bowe, Paul David, Bray, C. C., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Fajans, J., Fujiwara, M. C., Funakoshi, R., Gill, D. R., Hangst, Jeffrey S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hydomako, R., Jenkins, M. J., Jørgensen, L. V., Kurchaninov, L., Lambo, R., Madsen, N., Nolan, P., Olchanski, K., Olin, A., Page, R. D., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., El Nasr, S. S., Silveira, D. M., Storey, J. W., Thompson, R. I., Werf, D. P. D., Wurtele, J. S., and Yamazaki, Y.

Published
2008

12. Antiproton compression and radial measurements

Author

Andresen, Gorm, Bertsche, W., Bowe, Paul David, Bray, C. C., Butler, E., Cesar, C. L., Chapman, S., Charlton, M., Fajans, J., Fujiwara, M. C., Funakoshi, R., Gill, D. R., Hangst, Jeffrey S., Hardy, W. N., Hayano, R. S., Hayden, M. E., Humphries, A. J., Hydomako, R., Jenkins, M. J., Jørgensen, L. V., Kurchaninov, L., Lambo, R., Madsen, N., Nolan, P., Olchanski, K., Olin, A., Page, R. D., Povilus, A., Pusa, P., Robicheaux, F., Sarid, E., Seif El Nasr, S., Silveira, D. M., Storey, J. W., Thompson, R. I., van der Werf, D. P., Wurtele, J. S., and Yamazaki, Y.

Published
2008

13. Antimatter Plasmas in a Multipole Trap for Antihydrogen

Author

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

Published
2007

14. Search for Laser-Induced Formation of Antihydrogen Atoms

Author

Amoretti, M., Amsler, C., Bonomi, G., Bowe, Paul David, Canali, C., Carraro, C., Cesar, C.L., Charlton, M., Ejsing, A.M., Fontana, A., Fujiwara, A., Funakoshi, R., Genova, P., Hangst, Jeffrey S., Hayano, R.S., Jørgensen, L.V., Kellerbauer, A., Lagomarsino, V., Lodi Rizzini, E., Macrì, M., Madsen, Niels, Manuzio, G., Mitchard, D., Montagna, P., Posada, L.G.C., Pruys, H., Regenfus, C., Rotondi, A., Telle, H.H., Testera, G., Van der Werf, D.P., Variola, A., Venturelli, L., Yamazaki, Y., and Zurlo, N.

Published
2006

15. ALPHA Proposal

Author

Hangst, Jeffrey S and Bowe, Paul

Subjects
Detectors and Experimental Techniques
Published
2005

16. Memorandum: Progress report on the ATHENA experiment

Author

Amoretti, M, Amsler, Claude, Bendiscioli, G, Bonomi, G, Bouchta, A, Bowe, P, Carraro, C, Charlton, M, Collier, M, Doser, Michael, Filippini, V, Fontana, A, Fujiwara, M C, Funakoshi, R, Genova, P, Glauser, A, Grögler, D, Hangst, Jeffrey S, Hayano, R S, Higaki, H, Holzscheiter, M H, Jørgensen, L V, Kleppner, D, Lagomarsino, V, Landua, Rolf, Cesar, C L, Lindelöf, D, Lodi Rizzini, E, Macri, M, Madsen, N, Manuzio, G, Marchesotti, M, Montagna, P, Pruys, H S, Regenfus, C, Riedler, P, Rotondi, A, Rouleau, G, Salvini, P, Testera, G, Van der Werf, D P, Variola, A, Watson, T, Yamazaki, T, and Yamazaki, Y

Subjects
Detectors and Experimental Techniques
Published
2002

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