Compression of Antiproton Clouds for Antihydrogen Trapping
  Control of the radial profile of trapped antiproton clouds is critical to trapping antihydrogen. We report the first detailed measurements of the radial manipulation of antiproton clouds, including areal density compressions by factors as large as ten, by manipulating spatially overlapped electron plasmas. We show detailed measurements of the near-axis antiproton radial profile and its relation to that of the electron plasma. 
G.B. Andresen, W. Bertsche, P.D. Bowe, C.C. Bray, E. Butler, C.L.   Cesar, S. Chapman, M. Charlton, J. Fajans, M.C. Fujiwara...