Author: Garmendia, N.
Paper Title Page
THBP01 ESS-Bilbao RFQ Power Coupler: Design, Simulations and Tests 433
 
  • I. Bustinduy, A. Conde, D. Fernández-Cañoto, N. Garmendia, P.J. González, G. Harper, A. Kaftoosian, J. Martin, J.L. Muñoz
    ESS Bilbao, Zamudio, Spain
  • A.P. Letchford
    STFC/RAL/ISIS, Chilton, Didcot, Oxon, United Kingdom
  
  ESS-Bil­bao RFQ power cou­pler is pre­sented. The RFQ op­er­ates at 352.2 MHz and will ac­cel­er­ate the 32 mA pro­ton beam ex­tracted from the ion source up to 3.0MeV. The RFQ will com­plete the ESS-Bil­bao in­jec­tor, that can be used by the AR­GITU neu­tron source or as a stand-alone fa­cil­ity. The ma­chin­ing of the RFQ is fin­ished, and vac­uum tests as well as low power RF mea­sure­ments have been car­ried out. The pre­sented power cou­pler is a first it­er­a­tion of the de­vice, de­signed to be of eas­ier and faster man­u­fac­tur­ing than what might be needed for fu­ture up­grades of the linac. The cou­pler does not have ac­tive cool­ing and no braz­ing has been needed to as­sem­ble it. It can op­er­ate at the RF power re­quired by the RFQ but at lower duty cy­cles. The di­elec­tric win­dow is made of poly­meric ma­te­r­ial, so it can with­hold the as­sem­bly using vac­uum seals and bolts. De­sign and man­u­fac­tur­ing is­sues are re­ported in the paper, as well as the RF tests that have been car­ried out at medium power. Mul­ti­pact­ing cal­cu­la­tions com­pared to mea­sured val­ues dur­ing con­di­tion­ing are also re­ported. High power tests of the cou­pler have also been per­formed in the ISIS-FETS RFQ and are also de­scribed here.  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-THBP01  
About • Received ※ 29 September 2023 — Revised ※ 08 October 2023 — Accepted ※ 11 October 2023 — Issued ※ 28 October 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
THBP03 ESS-Bilbao RFQ Static Tuning Algorithm and Simulation 440
 
  • J.L. Muñoz, I. Bustinduy, A. Conde, N. Garmendia, P.J. González, J. Martin, V. Toyos
    ESS Bilbao, Derio, Spain
  
  The ESS-Bil­bao RFQ op­er­ates at 352.2 MHz. The ma­chin­ing of the four RFQ seg­ments has fin­ished and the as­sem­bly and tun­ing op­er­a­tions will fol­low shorly. The sta­tic tun­ing and field flat­ness are pro­vided by an array of 60 plunger tuners, dis­trib­uted along the 3.2 me­ters length of the struc­ture. There are four tuners per seg­ment per quad­rant, ex­cept for one of the seg­ments where the ports are used by the power cou­plers. A bead-pull setup will pro­vide the mea­sure­ments of the field pro­files, that will be col­lected in a ma­trix built up with the con­tri­bu­tions of in­di­vid­ual tuners. The con­ven­tional ap­proach of in­vert­ing the ma­trix to get the op­ti­mum tuners dis­tri­b­u­tion is ex­plored, as well as ad­di­tional op­ti­miza­tion method. Par­tic­u­larly, a ge­netic op­ti­miza­tion al­go­rithm pro­vides a very suc­ces­ful tun­ing of the RFQ. The so­lu­tion pro­vided by this ap­proach will be used as the ini­tial con­fig­u­ra­tion of the tuners be­fore the bead-pull mea­sure­ments are car­ried out. Ad­di­tion­ally, sta­tic and dy­namic tun­ing of the RFQ is stud­ied by high per­for­mance com­put­ing sim­u­la­tions of the RFQ. The analy­sis of the in-house com­pu­ta­tional elec­tro­mag­net­ics suite used for these tasks is also dis­cussed in this paper.  
poster icon Poster THBP03 [2.285 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-THBP03  
About • Received ※ 29 September 2023 — Revised ※ 08 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 28 October 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)