Towards Antihydrogen Trapping and Spectroscopy at ALPHA
  Spectroscopy of antihydrogen has the potential to yield high-precision tests of the CPT theorem and shed light on the matter-antimatter imbalance in the Universe. The ALPHA antihydrogen trap at CERN's Antiproton Decelerator aims to prepare a sample of antihydrogen atoms confined in an octupole-based Ioffe trap and to measure the frequency of several atomic transitions. We describe our techniques to directly measure the antiproton temperature and a new technique to cool them to below 10 K. We also show how our unique position-sensitive annihilation detector provides us with a highly sensitive method of identifying antiproton annihilations and effectively rejecting the cosmic-ray background. 
Eoin Butler, Gorm. B. Andresen, Mohammad. D. Ashkezari, Marcelo   Baquero-Ruiz, William Bertsche, Paul D. Bowe, Crystal C. B...
physics.atom-ph hep-ex physics.plasm-ph