Keyword: betatron
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MOP22 A Dedicated Wake-Building Feedback System to Study Single Bunch Instabilities in the Presence of Strong Space Charge space-charge, kicker, pick-up, feedback 135
  • R. Ainsworth, A.V. Burov, N. Eddy, A. Semenov
    Fermilab, Batavia, Illinois, USA
  Recent advances in the theoretical understanding of beam stability in the presence of strong space charge, has suggested a new class of instabilities known as convective instabilities. A novel approach to excite and study these instabilities will be to install a ‘waker’ system, a dedicated wake-building feedback system. The System was installed in the Fermilab Recycler and commissioned during 2021. The first results are presented.  
DOI • reference for this paper ※  
About • Received ※ 19 October 2021 — Revised ※ 20 October 2021 — Accepted ※ 26 November 2021 — Issue date ※ 12 April 2022
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TUAC2 Impact of Power Supply Ripple on the Beam Performance of the Large Hadron Collider and the High-Luminosity LHC power-supply, experiment, dipole, operation 170
  • S. Kostoglou, H. Bartosik, Y. Papaphilippou, G. Sterbini
    CERN, Geneva, Switzerland
  Harmonics of the mains frequency (50 Hz) have been systematically observed in the form of dipolar excitations in the transverse beam spectrum of the Large Hadron Collider (LHC) since the beginning of its operation. The power supply ripple, consisting of both fundamental and higher frequency components, is proven not to be the result of an artifact of the instrumentation systems with which they are observed. Potential sources of the perturbation have been identified through systematic analysis and experimental studies. Single-particle tracking simulations have been performed including a realistic power supply ripple spectrum, as acquired from experimental observations, to demonstrate the impact of such noise effects on beam performance.  
slides icon Slides TUAC2 [3.678 MB]  
DOI • reference for this paper ※  
About • Received ※ 04 October 2021 — Revised ※ 20 October 2021 — Accepted ※ 23 November 2021 — Issue date ※ 25 February 2022
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