Author: Samsam, S.
Paper Title Page
THPOJO25 HOM Damping in Multi-Cell Superconducting Cavities for the Future Electron Source BriXSinO 739
SUPCGE08   use link to see paper's listing under its alternate paper code  
 
  • S. Samsam, A. Bacci, C. Curatolo, I. Drebot, D. Giove, V. Petrillo, M. Rossetti Conti, A.R. Rossi, L. Serafini
    INFN-Milano, Milano, Italy
  • A. Bosotti, D. Giove, L. Monaco, R. Paparella, D. Sertore
    INFN/LASA, Segrate (MI), Italy
  • M.R. Masullo, A. Passarelli
    INFN-Napoli, Napoli, Italy
  • V. Petrillo
    Universita’ degli Studi di Milano, Milano, Italy
  
  High order modes (HOMs) in multi-cell su­per­con­duct­ing cav­i­ties are of par­tic­u­lar con­cern in beam dy­nam­ics of lin­ear ac­cel­er­a­tors, mainly those op­er­at­ing in CW mode with high cur­rent and high rep­e­ti­tion rate. These un­de­sired modes may in­voke beam in­sta­bil­i­ties, beam breakup and in­crease the en­ergy spread if not cor­rectly pulled out and damped. The study re­ported in this paper is ap­plied for damp­ing the HOMs in the main Linac of BriXSinO, an on­go­ing pro­ject of an En­ergy Re­cov­ery Linac at LASA INFN lab­o­ra­tory. We de­vel­oped a nu­mer­i­cal model to study the in­ter­ac­tion of mono­pole HOMs with the beam in long timescale. The pre­sented model, named HOMEN (High Order Modes Evo­lu­tion based on eN­ergy bud­get), al­lows the eval­u­a­tion of the loss fac­tor Kloss, cru­cial for eval­u­at­ing the per­turb­ing modes. At the same time, elec­tro­mag­netic sim­u­la­tions of the stand­ing wave mul­ti­cell cav­ity, high­lighted the dan­ger­ous modes and re­vealed a tol­er­a­ble beam en­ergy spread in­duced by HOMs. This method al­lows us to dis­tin­guish all dan­ger­ous modes of our in­ter­est for im­ple­ment­ing the nec­es­sary damp­ing mech­a­nisms.  
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DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-LINAC2022-THPOJO25  
About • Received ※ 22 August 2022 — Revised ※ 17 August 2022 — Accepted ※ 29 August 2022 — Issue date ※ 15 September 2022
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