Beam Diagnostics for Measurements of Antiproton Annihilation Cross Sections at Ultra-low Energy
1 Department of Physics, University of Tokyo, Hongo 7-3-1, Bunkyo-ku, Tokyo 113-0033, Japan
2 Max-Planck-Institut fur Quantenoptik, Hans-Kopfermann-Strasse 1, D-85748 Garching, Germany
3 Physics Department, CERN, 1211 Geneva 23, Switzerland
4 Wigner Institute for Particle and Nuclear Physics, H-1525 Budapest, Hungary
5 Dipartimento di Ingegneria dell’Informazione, Università di Brescia, 25133 Brescia, Italy
6 INFN, Gruppo Collegato di Brescia, 25133 Brescia, Italy
7 Università degli Studi dell’Insubria, Italy
8 INFN, Sezione di Milano Bicocca, I-20126 Milano, Italy
9 INFN, Sezione di Trieste, I-34127 Trieste, Italy
a e-mail: email@example.com
Published online: 20 March 2014
The ASACUSA (Atomic Spectroscopy And Collisions Using Slow Antiprotons) collaboration of CERN is currently attempting to measure the antiproton-nucleus in-flight annihilation cross sections on thin target foils of C, Pd, and Pt at 130 keV of kinetic energy. The low-energy antiprotons were supplied by the Antiproton Decelerator (AD) and a radio-frequency quadrupole decelerator. For this measurement, a beam profile monitor based on secondary electron emission was developed. Data from this monitor was used to ensure that antiprotons were precisely tuned to the position of an 80-mm-diameter experimental target, by measuring the spatial profile of 200-ns-long beam pulses containing 105 − 106 antiprotons with an active area of 40 mm × 40 mm and a spatial resolution of 4 mm. By using this monitor, we succeeded in finely tuning antiproton beams on the target, and observed some annihilation events originating from the target.
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