HESR 4: beam dynamics and collective effects

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HESR 4 beam dynamics and collective effects

• Tasks
• Task 1 Detailed beam accumulation studies
• barrier bucket manipulations
• Task 2 Beam cooling and kinetic equilibrium
• Code benchmarking
• 3D beam distribution in the HESR
• Task 3 Collective instabilities and impedances
• Accurate impedance budgets
• Impedance calculations and models

Partners

• GSI, Darmstadt
• High current beam physics group
• Contact O. Boine-Frankenheim
• FZ Jülich
• IKP, COSY group
• Contact A.Lehrach
• Uppsala University, Sweden
• The Svedberg Laboratory
• Contact V. Ziemann

Task 1 has a low priority now, as the HESR is not
accumulating anymore.
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Progress and achievements

• Employment
• August 2005 Scientist for HESR beam dynamics
  simulations hired at GSI.
• Finished reports
• Analysis of the HESR luminosities using
  realistic machine cycles (Publication)
• Kinetic study of longitudinal beam cooling
  equilibrium and beam loss (Publication)
• Ongoing studies
• 3D kinetic studies beam cooling equilibrium and
  beam loss
• Beam stability and impedance budget

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Work plan
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Publications and reports
Beam Performance and Luminosity Limitations in
the High-Energy Storage Ring (HESR) A. Lehrach,
O. Boine-Frankenheim, F. Hinterberger, R. Maier,
D. Prasuhn NIM A (2005) submitted Beam
equilibrium and beam loss with internal targets
in the HESR O. Boine-Frankenheim, R. Hasse, F.
Hinterberger, A. Lehrach, P. Zenkevich Submitted
to NIM A under preparation Analysis of beam
echoes observed in RHIC S. Sorge, O.
Boine-Frankenheim, W. Fischer EPAC contribution