9/15/05 A. Lehrach, HESR, Coulomb ’05 1 Intensity Limits and Intensity Limits and Beam Performances in the Beam Performances in the H H igh- igh- E E nergy nergy S S torage torage R R ing ing HESR-Consortium: FZJ, GSI, TSL, and Univ. of Bonn and Dortmund HESR Layout Beam Equilibrium Beam Losses and Luminosity Other Intensity Limiting Effects Summary & Outlook
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Intensity Limits and Beam Performances in the H igh- E nergy S torage R ing
Intensity Limits and Beam Performances in the H igh- E nergy S torage R ing. HESR-Consortium: FZJ, GSI, TSL, and Univ. of Bonn and Dortmund. HESR Layout Beam Equilibrium Beam Losses and Luminosity Other Intensity Limiting Effects Summary & Outlook. - PowerPoint PPT Presentation
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9/15/05 A. Lehrach, HESR, Coulomb ’05 1
Intensity Limits and Intensity Limits and Beam Performances in the Beam Performances in the HHigh-igh-EEnergy nergy SStorage torage RRingingHESR-Consortium: FZJ, GSI, TSL, and Univ. of Bonn and Dortmund
HESR Layout Beam Equilibrium Beam Losses and Luminosity Other Intensity Limiting Effects Summary & Outlook
One half of the arc super-periodMomentum range 1.5 – 15 GeV/c6-fold symmetry arcs with a length of 155 m each.Mirror symmetric FODO structure designed as pseudo second order achromat with dispersion suppression.Two straight sections of 132 m length each. Ring circumference 574 m.
Feasibility study of magnetized electron cooling for the HESR 9/2003
(Budker Institute, Novosibirsk, RUS)
HESR Electron Cooler
Electron Cooler
Cooling section
HV section electrostatic accelerator 0.45 - 8 MV, up to 2 A charged by H- beam Cooling section sc solenoid length 30 m magnetic field 0.2 - 0.5 T straightness 10-5
beam diameter 6 - 10 mm Bending section electrostatic up to 21 KV/cm bending radius 4 m
Theoretical “forecast”:N.S.Dikansky, V.V.Parkhomchuk, D.V.Pestrikov, Instability of Bunched Proton Beam interacting with ion “footprint”, Rus. Journ. Of Tech. Physics, v.46 (1976) 2551.
P. Zenkevich, A. Dolinskii and I. Hofmann, Dipole instability of a circulating beam due to the ion cloud in an electron cooling system, NIM A 532 (October 2004).
Effect of Electron Beam
Coherent Dipole Instabilities: In the presence of the electron beam in the cooling section, both longitudinal and transverse instability could take place for the circulating beam due to ion clouds