Author: Maclean, E.H.
Paper Title Page
MOP06 Resonance Compensation for High Intensity and High Brightness Beams in the CERN PSB 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, Meyrin, 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.  
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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
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MOP18 Injection Chicane Beta-Beating Correction for Enhancing the Brightness of the CERN PSB Beams 112
 
  • T. Prebibaj, S.C.P. Albright, F. Antoniou, F. Asvesta, H. Bartosik, C. Bracco, G.P. Di Giovanni, E.H. Maclean, B. Mikulec, E. Renner
    CERN, Meyrin, Switzerland
  • T. Prebibaj
    IAP, Frankfurt am Main, Germany
 
  In the context of the LHC Injectors Upgrade Project (LIU), the Proton Synchrotron Booster (PSB) developed an H charge exchange injection system. The four short rectangular dipoles of the injection chicane induce focusing errors through edge focusing and Eddy currents. These errors excite the half-integer resonance 2Qy = 9 and cause a dynamically changing beta-beating in the first milliseconds after injection. Using the beta-beating at the positions of two individually powered quadrupoles, measured with k-modulation, correction functions based on a model response matrix have been calculated and applied. Minimizing the beta-beating at injection allows the machine to be operated with betatron tunes closer to the half-integer resonance and therefore with larger space charge tune spreads. In this contribution the results of the beta-beating compensation studies and the impact on the achievable beam brightness limit of the machine are presented.  
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poster icon Poster MOP18 [1.322 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-HB2021-MOP18  
About • Received ※ 04 October 2021 — Revised ※ 01 November 2021 — Accepted ※ 05 February 2022 — Issue date ※ 11 April 2022
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