A Magnetic Trap for Antihydrogen Confinement

Refereed Publication
The goal of the ALPHA collaboration at CERN is to test CPT conservation by comparing the 1S–2S transitions of hydrogen and antihydrogen. To reach the ultimate accuracy of 1 part in 1018 , the (anti)atoms must be trapped. Using current technology, only magnetic minimum traps can confine (anti)hydrogen. [...]
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Published in

Nuclear Instruments and Methods in Physics Research A

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, K.Gomberoff, J.S. Hangst, R.S. Hayano, M. J. Jenkins, L. V. Jørgensen, P. Ko, N. Madsen, P. Nolan, R.D. Page, L.G.C. Posada, A. Povilus, E. Sarid, D. M. Silveira, D.P. van der Werf, Y. Yamazaki, B. Parker, J. Escallier, and A. Ghosh

Effects of extreme magnetic quadrupole fields on Penning Traps, and the consequences for antihydrogen trapping

Refereed Publication
Measurements on electrons confined in a Penning trap show that extreme quadrupole fields destroy particle confinement. Much of the particle loss comes from the hitherto unrecognized ballistic transport of particles directly into the wall. [...]
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Published in

Physical Review Letters

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

Antihydrogen on tap

Refereed Publication
Plentiful quantities of antihydrogen, the bound state system of the antiparticles the positron and the antiproton, have recently been made under very controlled conditions in experiments at the European Laboratory of Particle Physics (CERN) near Geneva. [...]
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Published in

Physics Education

Mike Charlton

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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Published in

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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Published in

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

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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Published in

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

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

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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Published in

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

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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Published in

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

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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Published in

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

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