1–6 Jun 2025
Taipei International Convention Center (TICC)
Asia/Taipei timezone

Damping of quadrupole oscillations with bunch-by-bunch longitudinal RF feedback for FAIR

THPS013
5 Jun 2025, 15:30
2h
Exhibiton Hall A _Salmon (TWTC)

Exhibiton Hall A _Salmon

TWTC

Poster Presentation MC6.T05 Beam Feedback Systems Thursday Poster Session

Speaker

Dieter Lens (GSI Helmholtz Centre for Heavy Ion Research)

Description

To damp undesired longitudinal oscillations of bunched beams, the main synchrotron SIS100 of FAIR (Facility for Antiproton and Ion Research) will be equipped with a bunch-by-bunch longitudinal feedback (LFB) system. It will consist of new broadband kicker cavities and a dedicated low-level RF (LLRF) system. The LFB helps to stabilize the beam, to keep longitudinal emittance blow-up low and to minimize beam losses via damping dipole and quadrupole oscillations for up to 10 bunches individually. The topology of the LLRF signal processing is validated in closed loop with beam in the heavy-ion synchrotron SIS18 at GSI for future integration into SIS100. In a recent SIS18 machine development experiment with two bunches at flattop, quadrupole oscillations were excited for one bunch and then damped with a prototype setup of the LFB system using an existing magnetic alloy cavity as dedicated kicker cavity. This paper presents the test setup, the results of this experiment, and the proposed LLRF topology of the closed-loop LFB system. This validates a core part of the final SIS100 system.

Region represented Europe
Paper preparation format LaTeX

Author

Dieter Lens (GSI Helmholtz Centre for Heavy Ion Research)

Co-authors

Bernhard Zipfel (GSI Helmholtz Centre for Heavy Ion Research) Dennis Ziegelmann (GSI Helmholtz Centre for Heavy Ion Research) Prof. Harald Klingbeil (Technical University of Darmstadt) Karl Thomin (GSI Helmholtz Centre for Heavy Ion Research) Kerstin Gross (GSI Helmholtz Centre for Heavy Ion Research) Martin Hardieck (GSI Helmholtz Centre for Heavy Ion Research) Robert Balß (GSI Helmholtz Centre for Heavy Ion Research) Ulrich Laier (GSI Helmholtz Centre for Heavy Ion Research)

Presentation materials

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