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Feb 15 – 19, 2016
Vienna University of Technology
Europe/Vienna timezone

Characterization of Neutral Trapped Antihydrogen in the ALPHA Experiment

Not scheduled
Vienna University of Technology

Vienna University of Technology

Gusshausstraße 27-29, 1040 Wien
Board: 52
Poster Semiconductor Detectors


Mr Ahmadi Mostafa (University of Liverpool)


The Antihydrogen Laser Physics Apparatus (ALPHA) experiment at CERN is designed to carry out detailed studies of the properties of neutral antihydrogen atoms. A comparison of the properties of hydrogen and antihydrogen allows a sensitive probe of fundamental symmetries in Nature. Recent achievements have paved the way for precision measurements. Experiments are performed through the adaption of well documented methods in atomic physics to the challenging environment of neutral antimatter handling. ALPHA has recently reached several important milestones en route to precision measurements. These include trapping of cold antihydrogens, long confinement, and the first spectroscopic measurement. Methods to study gravitational effects have been demonstrated and the charge neutrality of trapped antihydrogen has also been tested to high precision. A unique Silicon Vertex Detector (SVD) surrounding the neutral atom trap is used for the identification of antihydrogen annihilation. The SVD provides diagnostics of the antiproton plasma time evolution and, most importantly, individual antihydrogen annihilation event vertex locations. Characteristics of the SVD and analytical methods applied to the data produced by the SVD, in different experimental setups, will be presented. In addition, an overview of the ALPHA physics goals and current progress will be reviewed.

Primary author

Mr Ahmadi Mostafa (University of Liverpool)


Mr Andrea Capra (York University) Mr Andrew Evans (University of Calgary) Prof. Art Olin (TRIUMF) Dr Dave Joss (University of Liverpool) Mr Dave Seddon (University of Liverpool) Mr David Wells (University of Liverpool) Mr Jim Thornhill (University of Liverpool) Dr Joseph Mckenna (TRIUMF) Mr Konstantin Olchanski (TRIUMF) Mr Leonid Kurchaninov (TRIUMF) Dr Makoto Fujiwara (TRIUMF) Prof. Nolan Paul (University of Liverpool) Dr Petteri Pusa (University of Liverpool) Prof. Scott Menary (York University)

Presentation materials