Keyword: octupole
Paper Title Other Keywords Page
MOP06 Resonance Compensation for High Intensity and High Brightness Beams in the CERN PSB resonance, sextupole, injection, brightness 40
 
  • F. Asvesta, S.C.P. Albright, F. Antoniou, H. Bartosik, C. Bracco, G.P. Di Giovanni, E.H. Maclean, B. Mikulec, T. Prebibaj, E. Renner
    CERN, Geneva, Switzerland
 
  Resonance studies have been conducted during the recommissioning of the CERN Proton Synchrotron Booster (PSB) following the implementation of the LHC Injectors Upgrade (LIU) project. In particular, resonance identification through so-called loss maps has been applied on all four rings of the PSB, revealing various resonances up to fourth order. In a second step, compensation schemes for the observed resonances were developed using a combination of analytical methods, experimental data and machine learning tools. These resonance compensation schemes have been deployed in operation to minimize losses for reaching high intensity and high brightness, thereby achieving the target brightness for the LHC-type beams.  
video icon
        Right click on video for
Picture-in-Picture mode
or Full screen display.

At start the sound is muted!
 
poster icon Poster MOP06 [1.923 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2021-MOP06  
About • Received ※ 05 October 2021 — Revised ※ 17 October 2021 — Accepted ※ 22 November 2021 — Issue date ※ 27 November 2021
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
MOP07 Chromaticity Measurement Using Beam Transfer Function in High Energy Synchrotrons wakefield, network, synchrotron, operation 46
 
  • X. Buffat, S.V. Furuseth, G. Vicentini
    CERN, Geneva, Switzerland
  • S.V. Furuseth
    EPFL, Lausanne, Switzerland
 
  Control of chromaticity is often critical to mitigate collective instabilities in high energy synchrotrons, yet classical measurement methods are of limited use during high intensity operation. We explore the possibility to extract this information from beam transfer function measurements, with the development of a theoretical background that includes the impact of wakefields and by analysis of multi-particle tracking simulations. The investigations show promising results that could improve the operation of the HL-LHC by increasing stability margins.  
video icon
        Right click on video for
Picture-in-Picture mode
or Full screen display.

At start the sound is muted!
 
poster icon Poster MOP07 [0.716 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2021-MOP07  
About • Received ※ 04 October 2021 — Revised ※ 01 November 2021 — Accepted ※ 31 March 2022 — Issue date ※ 11 April 2022
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
MOP12 Understanding of the CERN-SPS Horizontal Instability with Multiple Bunches impedance, simulation, injection, kicker 77
 
  • C. Zannini, H. Bartosik, M. Carlà, K.S.B. Li, E. Métral, G. Rumolo, B. Salvant
    CERN, Geneva, Switzerland
  • L.R. Carver
    ESRF, Grenoble, France
  • M. Schenk
    EPFL, Lausanne, Switzerland
 
  At the end of 2018, an instability with multiple bunches has been consistently observed during high intensity studies at the CERN-SPS. This instability could be a significant limitation to achieve the bunch intensity expected after the LHC Injector Upgrade (LIU). Therefore, a deep understanding of the phenomena is essential to identify the best mitigation strategy. Extensive simulation studies have been performed to explore the consistency of the current SPS model, give a possible interpretation of the instability mechanism and outline some possible cures.  
video icon
        Right click on video for
Picture-in-Picture mode
or Full screen display.

At start the sound is muted!
 
poster icon Poster MOP12 [1.454 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2021-MOP12  
About • Received ※ 07 October 2021 — Revised ※ 20 October 2021 — Accepted ※ 28 December 2021 — Issue date ※ 11 April 2022
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THAC3 Exploring Quasi-Integrable Optics with the IBEX Paul Trap lattice, experiment, quadrupole, optics 214
 
  • J.A.D. Flowerdew
    University of Oxford, Oxford, United Kingdom
  • D.J. Kelliher, S. Machida, S.L. Sheehy
    STFC/RAL/ASTeC, Chilton, Didcot, Oxon, United Kingdom
 
  An ideal accelerator built from linear components will exhibit bounded and stable particle motion. However, in reality, any imperfections in the magnetic field strength or slight misalignments of components can introduce chaotic and unstable particle motion. All accelerators are prone to these non-linearities but the effects are amplified when studying high intensity particle beams with the presence of space charge effects. This work aims to explore the non-linearities which arise in high intensity particle beams using a scaled experiment called IBEX. The IBEX experiment is a linear Paul trap which allows the transverse dynamics of a collection of trapped particles to be studied. It does this by mimicking the propagation through multiple quadrupole lattice periods whilst remaining stationary in the laboratory frame. IBEX is currently undergoing a nonlinear upgrade with the goal of investigating Quasi-Integrable Optics (QIO), a form of Nonlinear Integrable Optics (NIO), in order to improve our understanding and utilisation of high intensity particle beams.  
video icon
        Right click on video for
Picture-in-Picture mode
or Full screen display.

At start the sound is muted!
 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2021-THAC3  
About • Received ※ 08 October 2021 — Revised ※ 16 October 2021 — Accepted ※ 22 November 2021 — Issue date ※ 23 December 2021
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)