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 development and benchmarking
• 3D beam distribution in the HESR
• Task 3 Collective instabilities and impedances
• Impedance library and budget

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 been dropped, because
accumulation will be performed in the RESR.
Deliverables Report(s) on optimized beam
equilibrium, loss and stability
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Work accomplished

• Employment
• August 2005 Scientist for HESR beam dynamics
  simulations hired at GSI.
• Published reports
• Analysis of the HESR luminosities using
  realistic machine cycles
• Kinetic study of longitudinal beam cooling
  equilibrium and beam loss
• Beam heating and loss due to pellet targets
• Detail study of IBS at HESR relevant energies in
  RHIC
• Ongoing studies
• 3D beam equilibrium and loss studies space
  charge field of the e-cooler
• Beam stability and impedance budget effect of
  trapped ions

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Example results
Longitudinal simulations Internal target
induced longitudinal tail in a barrier bucket
bucket
3D simulation studies Tune footprint with
e-cooler space charge. Simulations with MAD-X.
S.Sorge, et al., to be published
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Publications and reports in 2006
1 Beam Performance and Luminosity Limitations
in the High-Energy Storage Ring A. Lehrach,
O. Boine-Frankenheim, F. Hinterberger, R. Maier,
D. Prasuhn Nucl. Inst. and Methods A 561
(2006) 289. 2 Beam equilibrium and beam loss
with internal targets in the HESR O.
Boine-Frankenheim, R. Hasse, F. Hinterberger, A.
Lehrach, P. Zenkevich Nucl. Inst. and
Methods A 560 (2006) 245. 3 When are pellet
targets to thick ? V. Ziemann Nucl.
Inst. and Methods A 565 (2006) 370. 4 Analysis
of measured transverse beam echoes in RHIC
S. Sorge, O. Boine-Frankenheim, W. Fischer
Proc. of ICAP 2006, October 2-6 2006, Chamonix
Mont-Blanc, France 5 Beam-dynamics simulation
studies for the High-Energy Storage Ring (HESR)
A. Lehrach, O. Boine-Frankenheim, R. Hasse. D.
Prasuhn Proc. of ICAP 2006, October 2-6
2006, Chamonix Mont-Blanc, France
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Work plan