Conference Proceedings (unrefereed)

Conference Proceeding (unrefereed)

The ALPHA detector: Module Production and Assembly

Conference Proceeding (unrefereed)
ALPHA is one of the experiments situated at CERN's Antiproton Decelerator (AD). A Silicon Vertex Detector (SVD) is placed to surround the ALPHA atom trap. [...]
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Journal of Instruments

G. B. Andresen, M. D. Ashkezari, M. Baquero-Ruiz, W. Bertsche, P. D. Bowe, E. Butler, 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, L. Kurchaninov, N. Madsen, J. T. K. McKenna, S. Menary, P. Nolan, K. Olchanski, A. Olin, A. Povilus, P. Pusa, F. Robicheaux, J. Sampson, E. Sarid, D. Seddon, S. Seif el Nasr, D. M. Silveira, C. So, J. W. Storey, R. I. Thompson, J. Thornhill, D. Wells, D. P. van der Werf

ALPHA Antihydrogen Experiment

Conference Proceeding (unrefereed)
ALPHA is an experiment at CERN, whose ultimate goal is to perform a precise test of CPT symmetry with trapped antihydrogen atoms. [...]
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Fifth meeting on CPT and Lorentz Symmetry

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

Antiproton compression and radial measurements

Conference Proceeding (unrefereed)
Control of the radial profile of trapped antiproton clouds is critical to trapping antihydrogen. We report detailed measurements of the radial manipulation of antiproton clouds, including areal density compressions by factors as large as ten, achieved by manipulating spatially overlapped electron plasmas. [...]
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AIP Conference Proceedings

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

Particle Physics Aspects of Antihydrogen Studies with ALPHA at CERN

Conference Proceeding (unrefereed)
We discuss aspects of antihydrogen studies, that relate to particle physics ideas and techniques, within the context of the ALPHA experiment at CERN’s Antiproton Decelerator facility. We review the fundamental physics motivations for antihydrogen studies, and their potential physics reach. [...]
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AIP Conference Proceedings

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

First Attempts at Antihydrogen Trapping in ALPHA

Conference Proceeding (unrefereed)
The ALPHA apparatus is designed to produce and trap antihydrogen atoms. The device comprises a multifunction Penning trap and a superconducting, neutral atom trap having a minimum-B configuration. [...]
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AIP Conference Proceedings

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

The ALPHA Antihydrogen Experiment

Conference Proceeding (unrefereed)
ALPHA is a new experiment at the CERN Antiproton Decelerator (AD). The short term goal of ALPHA is trapping of cold antihydrogen, with the long term goal of conducting precise spectroscopic comparisons of hydrogen and antihydrogen. [...]
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Published in

Fourth Meeting on CPT and Lorentz Symmetry

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

Simple loss scaling laws for quadrupoles and higher-order multipoles used in antihydrogen traps

Conference Proceeding (unrefereed)
Simple scaling laws strongly suggest that for antihydrogen relevant parameters, quadrupole magnetic fields will transport particles into, or near to, the trap walls. [...]
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AIP Conference Proceedings

J. Fajans, W. Bertsche, K. Burke, A. Deutsch, S. F. Chapman, K. Gomberoff, D. P. van der Werf, and J. S. Wurtele

Antihydrogen from merged plasmas - cold enough to trap?

Conference Proceeding (unrefereed)
The merging of antiprotons with a positron plasma is the predominant and highest efficient method for cold antihydrogen formation used to date [1, 2, 3]. We present experimental evidence that this method has serious disadvantages for producing antihydrogen cold enough to be trapped [4, 5]. Antihydrogen is neutral but may be trapped in a magnetic field minimum. [...]
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AIP Conference Proceedings

Niels Madsen

The ALPHA Experiment: A Cold Antihydrogen Trap

Conference Proceeding (unrefereed)
The ALPHA experiment aims to trap antihydrogen as the next crucial step towards a precise CPT test, by a spectroscopic comparison of antihydrogen with hydrogen. The experiment will retain the salient techniques developed by the ATHENA collaboration during the previous phase of antihydrogen experiments at the antiproton decelerator (AD) at CERN. [...]
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AIP Conference Proceedings

W. Bertsche, A. Boston, P.D. Bowe, C.L. Cesar, S. Chapman, M. Charlton, M. Chartier, A. Deutsch, J. Fajans, M.C. Fujiwara, R. Funakoshi, D.Gill, K.Gomberoff, D. Grote , J.S. Hangst, R.S. Hayano, M. Jenkins, L. V. Jørgensen, N. Madsen, D. Miranda, P. Nolan, K. Ochanski, A.Olin, R.D. Page, L.G.C. Posada, F. Robicheaux, E. Sarid, H.H. Telle, J.-L. Vay, J. Wurtele, D.P. van der Werf, and Y. Yamazaki