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Senichev, Y.

Paper Title Page
TUPAN024 HESR at FAIR: Status of Technical Planning 1442
 
  • R. Tolle, K. Bongardt, J. Dietrich, F. M. Esser, O. Felden, R. Greven, G. Hansen, F. Klehr, A. Lehrach, B. Lorentz, R. Maier, D. Prasuhn, A. Raccanelli, M. Schmitt, Y. Senichev, E. Senicheva, R. Stassen, H. Stockhorst
    FZJ, Julich
  • T. Bergmark, S. Johnson, T. Johnson, T. Lofnes, G. Norman, T. Peterson
    Uppsala University, Uppsala
  • B. Gålnander, D. Reistad
    TSL, Uppsala
  • F. Hinterberger
    Universität Bonn, Helmholtz-Institut für Strahlen- und Kernphysik, Bonn
  • K. Rathsman
    UU/ISV, Uppsala
  • M. Steck
    GSI, Darmstadt
 
  The High-Energy Storage Ring (HESR) of the international Facility for Antiproton and Ion Research (FAIR) at GSI in Darmstadt is dedicated to Strong Interaction studies with antiprotons in the momentum range from 1.5 to 15 GeV/c. Powerful phase-space cooling is needed to reach demanding experimental requirements in terms of luminosity and beam quality. Status and details of technical planning including cryogenic concept will be presented.  
THPAN027 The Optimum Chromaticity Correction Scheme for Monochromatic and Non-Monochromatic Beam in HESR 3286
 
  • A. N. Chechenin, Y. Senichev, N. E. Vasyukhin
    FZJ, Julich
 
  The High Energy Storage Ring (HESR) of FAIR project consists of two achromatic arcs and two dispersionless straight sections. Due to the multi-functional purpose of the straight sections their contribution into the total chromaticity of the first and second order exceeds the arc's contribution and can affect on the non-monochromatic beam dynamic aperture. We investigate the optimum sextupole and octupole correction scheme for monochromatic and non-monochromatic beam to reach the larger dynamic aperture.  
THPAN028 HESR Lattice with Non-similar Arcs for the Stochastic Cooling 3289
 
  • Y. Senichev
    FZJ, Julich
 
  The advanced HESR lattice with two arcs having the identical layout and the different slip factors are developed. The conception of arcs with three families of quadrupole allows easy adjusting the imaginary transition energy in one arc and the real transition energy in another arc with the absolute value close to the beam energy in whole required region from 3.0 GeV to 14 GeV. The arcs have the special feature, when the high order non-linearities are fully compensated inside of each arc, and therefore the dynamic aperture of the whole machine is conserved. We consider and compare two lattices with the same absolute value of transition energy: the current lattice with the negative momentum compaction factor in both arcs and the lattice having the negative and positive momentum compaction factors in different arcs correspondingly. Simultaneously we analyzed the 4 and 6 fold symmetry arcs machine. It allows making the conclusion that the 4 fold symmetry lattice is more suitable to get the required slip factors. At the lowest energy 3 GeV, the absolute value of slip factor in the imaginary and the real arc is related as ~0.09/0.02 correspondingly. For the higher beam energy this ratio is much bigger.  
FRPMN019 The Regular and Random Multi-Pole Errors Influence on the HESR Dynamic Aperture 3949
 
  • A. N. Chechenin, Y. Senichev, N. E. Vasyukhin
    FZJ, Julich
 
  The High Energy Storage Ring has the racetrack lattice, where each arc has the even number of super-periods S and the tune with one unit smaller ν=S-1 in both planes. Due to this fundamental feature the total n-order multi-pole is entirely cancelled and the regular errors can be fully compensated inside of one arc. In case of the random multi-pole errors the dynamic aperture is determined by the structure resonances excitation. We consider both regular and random multi-pole influence on the dynamic aperture and the possible correction scheme.