Jun 13 – 19, 2015
University of Alberta
America/Edmonton timezone
Welcome to the 2015 CAP Congress! / Bienvenue au congrès de l'ACP 2015!

Casting Light on Antimatter: Fundamental Physics with the ALPHA Antihydrogen Trap

Jun 17, 2015, 1:45 PM
CCIS L1-140 (University of Alberta)

CCIS L1-140

University of Alberta

Invited Speaker / Conférencier invité Nuclear Physics / Physique nucléaire (DNP-DPN) W2-4 Testing Fundamental Symmetries I (DNP-PPD) / Tests de symétries fondamentales I (DPN-PPD)


Dr Makoto Fujiwara (TRIUMF)


ALPHA is an international project at CERN, with substantial Canadian involvement, whose ultimate goal is to test symmetry between matter and antimatter via comparisons of the properties of atomic hydrogen with its antimatter counter-part, antihydrogen. After several years of development, we have recently achieved significant milestones, including the first stable confinement of antihydrogen [1] for as long as 1000 seconds [2]. ALPHA has also succeeded in performing the first proof-of-principle spectroscopic measurement on antihydrogen atoms by driving their hyperfine transitions with microwaves [3]. Furthermore, we reported a precision measurement of charge neutrality of antihydrogen [4], which in turn provides an improved measurement of the electric charge of the positron. Following these milestones, we have constructed an entirely new apparatus, ALPHA-2, which allows laser access to the trapped anti-atoms, and provides improved magnetic field configurations for microwave spectroscopy. For the longer-term, possibilities for measurements of the antimatter-gravity interaction are being explored. This talk will discuss the motivations, recent achievements and the future prospects of fundamental physics studies with ALPHA. References : [1] G. B. Andresen et al., Nature 468, 673 (2010). [2] G.B. Andresen et al., Nature Physics 7, 558 (2011). [3] C. Amole et al., Nature 483, 439 (2012). [4] C. Amole et al. Nature Communications 5, 3955 (2014)

Primary author

Dr Makoto Fujiwara (TRIUMF)

Presentation materials

There are no materials yet.