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Your search keyword '"Hayden, M.E."' showing total 3 results
Start Over Author "Hayden, M.E." Topic physics::atomic physics
3 results on '"Hayden, M.E."'

1. Silicon vertex detector upgrade in the ALPHA experiment

Author

Amole, C, Andresen, G.B, Ashkezari, M.D, Baquero-Ruiz, M, Bertsche, W, Burrows, C, Butler, E, Capra, A, 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, Isaac, C.A, Jonsell, S, Kurchaninov, L, Little, A, Madsen, N, McKenna, J.T.K, Menary, S, Napoli, S.C, Nolan, P, Olchanski, K, Olin, A, Povilus, A, Pusa, P, Rasmussen, C.Ø, Robicheaux, F, Sacramento, R.L, Sampson, J.A, Sarid, E, Seddon, D, Silveira, D.M, So, C, Stracka, S, Tharp, T, Thompson, R.I, Thornhill, J, Tooley, M.P, Van Der Werf, D.P, and Wells, D

Subjects
Antimatter, Event reconstruction, Physics::Instrumentation and Detectors, Physics::Accelerator Physics, Physics::Atomic Physics, Silicon Vertex Detector, Detectors and Experimental Techniques, Antihydrogen, Cosmic ray background suppression
Abstract

The Silicon Vertex Detector (SVD) is the main diagnostic tool in the ALPHA-experiment. It provides precise spatial and timing information of antiproton (antihydrogen) annihilation events (vertices), and most importantly, the SVD is capable of directly identifying and analysing single annihilation events, thereby forming the basis of ALPHA's analysis. This paper describes the ALPHA SVD and its upgrade, installed in the ALPHA's new neutral atom trap.

Published
2013

2. Search for trapped antihydrogen in ALPHA

Author

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

Subjects
Condensed Matter::Quantum Gases, Physics::Atomic and Molecular Clusters, Physics::Atomic Physics
Abstract

Antihydrogen spectroscopy promises precise tests of the symmetry of matter and antimatter, and can possibly offer new insights into the baryon asymmetry of the universe. Antihydrogen is, however, difficult to synthesize and is produced only in small quantities. The ALPHA collaboration is therefore pursuing a path towards trapping cold antihydrogen to permit the use of precision atomic physics tools to carry out comparisons of antihydrogen and hydrogen. ALPHA has addressed these challenges. Control of the plasma sizes has helped to lower the influence of the multipole field used in the neutral atom trap, and thus lowered the temperature of the created atoms. Finally, the first systematic attempt to identify trapped antihydrogen in our system is discussed. This discussion includes special techniques for fast release of the trapped anti-atoms, as well as a silicon vertex detector to identify antiproton annihilations. The silicon detector reduces the background of annihilations, including background from antiprotons that can be mirror trapped in the fields of the neutral atom trap. A description of how to differentiate between these events and those resulting from trapped antihydrogen atoms is also included.

Published
2011

3. 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

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