ELENA: the extra low energy anti-proton facility at CERN
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ELENA: the extra low energy anti-proton facility at CERN Stephan Maury · Walter Oelert · Wolfgang Bartmann · Pavel Belochitskii · Horst Breuker · Francois Butin · Christian Carli · Tommy Eriksson · Sergio Pasinelli · Gerard Tranquille
© Springer International Publishing Switzerland 2014
Abstract At the last LEAP conference in Vancouver 2011 the authors stated that a project ”ELENA”, as an abbreviation for Extra Low ENergy Antiproton ring and as first discussed in 1982 for LEAR by H. Herr et al., was freshly proposed with a substantial new design and revised layout and that it was under consideration to be built at CERN. ELENA is an upgrade of the Anti-proton Decelerator (AD) at CERN and is devoted to special experiments with physics using low energy anti-protons. The main topics are the anti-hydrogen production and consecutive studies of the features of this anti-matter atom as well as the anti-proton nucleon interaction by testing the QED to high precision. During the last years the project underwent several steps in presentations at different committees at CERN and was finally approved such that the construction has started. ELENA will increase the number of useful anti-protons by about two orders of magnitude and will allow to serve up to four experiments simultaneously. Very first and convincing results from the experiments at the AD have been published recently. For high precision physics, however, it appears to be cumbersome, time consuming and ineffective when collecting the needed large numbers and high densities of anti-proton clouds with the present AD. Both the effectiveness and the availability for additional experiments at this unique facility will drastically increase, when the anti-proton beam of presently 5 MeV kinetic energy is reduced by the additional decelerator ELENA to 100 keV. Keywords Antihydrogen · CPT-Test · Deceleration
Proceedings of the 11th International Conference on Low Energy Antiproton Physics (LEAP 2013) held in Uppsala, Sweden, 10–15 June, 2013 S. Maury · W. Bartmann · P. Belochitskii · H. Breuker · F. Butin · C. Carli · T. Eriksson · S. Pasinelli · G. Tranquille CERN, 1211 Geneve 22, Switzerland W. Oelert () Johannes Gutenberg-Universit¨at Mainz, 55099 Mainz, Germany e-mail: [email protected]
S. Maury et al.
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Fig. 1 ELENA positioned in the AD Hall
1 Introduction CERN has a longstanding tradition of pursuing fundamental physics on extreme energy scales. Besides the main research focus of experiments at the Large Hadron Collider (LHC) with its great success in recent years on the Higgs particle search, a variety of other topics are covered and one of them is the low energy anti-proton physics. The present physics knowledge is successfully described by the Standard Model and the General Relativity, though in the anti-matter regime many predictions of this established theoretical framework still remain experimentally unverified. There is a huge interest in the very compelling scientific case for anti-hydrogen and low energy anti-proton physics, which has been regul
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