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International Conference on Low Energy Antiproton Physics (LEAP)

Manipulation and Transport of Antiprotons for an Efficient Production of Antihydrogen Atoms

M. Tajima, N. Kuroda, Pierre Dupré, Y. Nagata, B. Radics, Takuya Matsudate, Marco Leali, V. Mascagna, L. Venturelli, H. Breuker, H. Higaki, Yasuyuki Kanai, Evandro Lodi Rizzini, Y. Matsuda, S. Ulmer, Y. Yamazaki

Published Nov 23, 2017• 2 citations
Publisher

Abstract

The ASACUSA collaboration is developing methods to extract and transport antiprotons at 20 eV adiabatically for an efficient production of cold antihydrogen atoms using a direct injection scheme.We successfully observed a high production rate of antihydrogen atoms immediately after the mixing of antiprotons.
DOI
10.7566/jpscp.18.011008

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The ASACUSA CUSP experiment plans a high precision spectroscopy of the ground-state hyperfine splitting of antihydrogen to test CPT symmetry.To perform this, a Rabi-like antiatomic beam method has been developed with a novel double-cusp trap.Antihydrogen atoms were synthesized in the double-cusp trap by directly injecting antiprotons from an accumulation trap into a positron plasma.By adjusting the energy difference between the incoming antiproton beam and the positron plasma, a high-rate production of antihydrogen atoms was observed.
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The author's ATRAP team has managed to simultaneously accumulate cold antiprotons and cold positrons. Cold antihydrogen is produced when antiprotons are repeatedly driven into collisions with cold positrons within a nested Penning trap. Efficient antihydrogen production takes place during many cycles of positron cooling of antiprotons. A first measurement of a distribution of antihydrogen states is made using a preionizing electric field between separated production and detection regions. Surviving antihydrogen is stripped in an ionization well that captures and stores the free antiproton for background-free detection. A background-free observation of cold antihydrogen atoms was made using field ionization followed by antiproton storage, a detection method that provided the first experimental information about antihydrogen atomic states. More antihydrogen atoms can be field ionized in an hour than all the anti-matter atoms that have been previously reported, and the production rate per incident high energy antiproton is higher than ever observed. The high rate and the high Rydberg states suggest that the antihydrogen is formed via three-body recombination. This report presents bibliographic citations for 10 publications and 36 lectures that were produced during 2004 under this contract. The author also was the recipient of the George Ledlie Prize at Harvard University in 2004.
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Cold antihydrogen is produced when antiprotons are repeatedly driven into collisions with cold positrons within a nested Penning trap. Efficient antihydrogen production takes place during many cycles of positron cooling of antiprotons. A first measurement of a distribution of antihydrogen states is made using a preionizing electric field between separated production and detection regions. Surviving antihydrogen is stripped in an ionization well that captures and stores the freed antiproton for background-free detection.