Author: Munoz, J.L.    [Muñoz, J.L.]
Paper Title Page
MOPAB340 Experimental Tests with the First Segment of ESS-Bilbao RFQ Linac 1054
 
  • J.L. Muñoz, I. Bustinduy, A. Conde, N. Garmendia, P.J. González, J. Martin, A. Zugazaga
    ESS Bilbao, Derio, Spain
  
  The ESS-Bil­bao RFQ is an as­sem­bly of four seg­ments, each one about 800 mm in length. The first seg­ment has been man­u­fac­tured be­fore the oth­ers, so it could be thor­oughly tested in order to val­i­date the cho­sen tech­no­log­i­cal ap­proach for the RFQ, as it uses poly­meric vac­uum gas­kets and bolts in­stead of braz­ing. In this paper we re­port on the tests run with the seg­ment and their re­sults. Vac­uum tests, metrol­ogy mea­sure­ments, low power RF tests as well as ex­ten­sive tun­ing tests mea­sur­ing the cav­ity res­o­nant quadrupo­lar fre­quency as a func­tion of cool­ing water tem­per­a­ture have been done. Ex­per­i­men­tal re­sults are com­pared to the ex­pected val­ues ob­tained from nu­mer­i­cal sim­u­la­tions. We de­scribe the ex­per­i­men­tal set-ups for the mea­sure­ments and the sim­u­la­tions. Re­sults are an­a­lyzed with the aim of val­i­dat­ing the de­sign, and also to pro­vide pre­dic­tions for tun­ing and op­er­a­tion of the whole RFQ. As a con­se­quence of the pos­i­tive re­sults of the tests re­ported here, the re­main­ing seg­ments have al­ready been ten­dered.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB340  
About • paper received ※ 19 May 2021       paper accepted ※ 25 May 2021       issue date ※ 20 August 2021  
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MOPAB356 The ESS MEBT RF Buncher Cavities Conditioning Process 1107
 
  • I. Bustinduy, N. Garmendia, P.J. González, A. Kaftoosian, S. Masa, I. Mazkiaran, L.C. Medina, J.L. Muñoz
    ESS Bilbao, Zamudio, Spain
  • J. Etxeberria, J.P.S. Martins
    ESS, Lund, Sweden
  
  Funding: This work is part of FEDER-TRACKS project, co-funded by the European Regional Development Fund (ERDF) .
As part of the 5 MW Eu­ro­pean Spal­la­tion Source (ESS), the Medium En­ergy Beam Trans­port (MEBT) was de­signed, as­sem­bled, and in­stalled in the tun­nel since May 2020 by ESS-Bil­bao. This sec­tion of the ac­cel­er­a­tor is lo­cated be­tween the Radio Fre­quency Quadru­pole (RFQ) and the Drift Tube Linac (DTL). The main pur­pose of the MEBT is to match the in­com­ing beam from the RFQ both trans­versely and lon­gi­tu­di­nally into the DTL. The lon­gi­tu­di­nal match­ing is achieved by three 352.209 MHz RF buncher cav­i­ties. In this paper, we focus on the RF con­di­tion­ing process for each set of power cou­pler and buncher cav­ity. For this pur­pose, dif­fer­ent tools were de­vel­oped on EPICS and Python as well as elec­tron­ics hard­ware such as Fast In­ter­lock Mod­ule (FIM) and tim­ing sys­tem. These tools served to au­tom­a­tize both the cav­ity fre­quency tun­ing and the power ramp-up process and will be de­scribed in de­tail in the fol­low­ing sec­tions. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB356  
About • paper received ※ 18 May 2021       paper accepted ※ 09 June 2021       issue date ※ 25 August 2021  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)