| Paper |
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| TPAT007 |
RF Defocusing in Super-Conducting Structure with Constant Geometry
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1042 |
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- Y. Senichev, R. Maier, N.E. Vasyukhin
FZJ, Jülich
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Due to higher accelerating gradient in the super-conducting linac the RF defocusing factor plays significant role in the beam dynamics. Together with the space charge it is a main reason for the stability loss. Usually it is estimated in frame of the travelling wave formalism with synchronous motion. However, the super-conducting cavity is desirable to have the constant geometry, when synchronous motion is absent. In this case the quasi-synchronous phase velocity is adjusted by RF phasing. In this paper we investigate RF defocusing factor in absent of synchronism between the beam and the accelerating structure.
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| FPAE001 |
Design Work for the High-Energy Storage Ring for Antiprotons of the Future GSI Project
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776 |
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- A. Lehrach, S. An, K. Bongardt, J. Dietrich, R. Eichhorn, B. Lorentz, R. Maier, S. Martin, D. Prasuhn, Y. Senichev, E.A. Senicheva, H. Stockhorst, R. Tölle, E. Zaplatin
FZJ, Jülich
- O. Boine-Frankenheim, A. Dolinskii, M. Steck
GSI, Darmstadt
- B. Gålnander, D. Reistad
TSL, Uppsala
- F.H. Hinterberger
Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik,, Bonn
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The High-Energy Storage Ring (HESR) of the future international Facility for Antiproton and Ion Research (FAIR) at GSI in Darmstadt is planned as an antiproton cooler and storage ring in the momentum range from 1.5 to 15 GeV/c. The design work for the HESR is organized by a consortium with scientists from FZ Jülich, GSI Darmstadt and TSL Uppsala. An important feature of the new facility is the combination of phase space cooled beams with internal targets, resulting in demanding beam parameter in two operation modes: high luminosity mode with beam intensities up to few times 1011, and high resolution mode with a momentum spread down to 10-5, respectively. To reach these beam parameters very powerful phase space cooling is needed, utilizing high-energy electron cooling and high-bandwidth stochastic cooling. In this paper an overview of the design work is given, focusing on recent developments and planned R&D work.
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