Keyword: vacuum
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THBP01 ESS-Bilbao RFQ Power Coupler: Design, Simulations and Tests rfq, cavity, linac, multipactoring 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
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THBP05 CERN SPS Dilution Kicker Vacuum Pressure Behaviour under Unprecedented Beam Brightness kicker, operation, brightness, flattop 447
 
  • F.M. Velotti, M.J. Barnes, W. Bartmann, H. Bartosik, E. Carlier, G. Favia, I. Karpov, K.S.B. Li, N. Magnin, L. Mether, V. Senaj, P. Van Trappen, C. Zannini
    CERN, Meyrin, Switzerland
  
  The Super Pro­ton Syn­chro­tron (SPS) is the sec­ond largest syn­chro­tron at CERN and pro­duces high-bright­ness beams for the Large Hadron Col­lider (LHC). Re­cently, the di­lu­tion kicker (MKDH) of the SPS beam dump sys­tem (SBDS) has demon­strated unan­tic­i­pated be­hav­iour under high beam bright­ness con­di­tions. Dur­ing the 2022 and 2023 beam com­mis­sion­ing, the MKDH, which is rou­tinely pulsed at high volt­age, was sub­jected to in­ten­si­ties of up to 288 bunches of 2·1011 pro­tons per bunch and bunch lengths as low as 1.5 ns. Under these con­di­tions, all the SPS kick­ers and septa ex­hib­ited a rapid vac­uum pres­sure rise and a sig­nif­i­cant tem­per­a­ture in­crease with the MKDH play­ing the dom­i­nant ef­fect in re­strict­ing the max­i­mum line den­sity that can be at­tained. This paper pre­sents the re­sults of the col­lected data, em­pha­sizes the de­pen­dence on beam pa­ra­me­ters, and in­tro­duces a prob­a­bilis­tic model to il­lus­trate the ef­fect of MKDH con­di­tion­ing ob­served to fore­cast the pres­sure be­hav­iour. Fi­nally, po­ten­tial coun­ter­mea­sures and out­look are dis­cussed.  
poster icon Poster THBP05 [1.913 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-THBP05  
About • Received ※ 29 September 2023 — Revised ※ 07 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 19 October 2023
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THBP36 Study of the Performance of the CERN Proton Synchrotron Internal Dump simulation, beam-losses, proton, synchrotron 555
 
  • T. Pugnat, L.S. Esposito, M. Giovannozzi, C. Hernalsteens, A. Huschauer, S. Niang
    CERN, Meyrin, Switzerland
  • D. Domange, E. Gnacadja, R. Tesse
    ULB, Bruxelles, Belgium
  
  In the frame­work of the LHC In­jec­tor Up­grade pro­ject, a new in­ter­nal dump for the CERN Pro­ton Syn­chro­tron (PS) has been de­signed, in­stalled, and suc­cess­fully com­mis­sioned. This de­vice is meant to move rapidly into the beam and stop charged par­ti­cles over sev­eral turns to pro­vide pro­tec­tion to the PS hard­ware against beam-in­duced dam­age. The per­for­mance of the dump should en­sure ef­fi­cient use through­out the PS en­ergy range, i.e. from in­jec­tion at 2 GeV (ki­netic en­ergy) to flat top at 26 GeV (total en­ergy). In this paper, de­tailed nu­mer­i­cal sim­u­la­tions are pre­sented, car­ried out with a com­bi­na­tion of so­phis­ti­cated beam dy­nam­ics and beam-mat­ter in­ter­ac­tion codes, as­sess­ing the be­hav­iour of stopped or scat­tered par­ti­cles. The re­sults of these nu­mer­i­cal sim­u­la­tions are com­pared with the data col­lected dur­ing the rou­tine op­er­a­tion of the PS and its in­ter­nal dump.  
poster icon Poster THBP36 [0.609 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-THBP36  
About • Received ※ 26 September 2023 — Revised ※ 05 October 2023 — Accepted ※ 10 October 2023 — Issued ※ 28 October 2023
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THBP52 A Python Package to Compute Beam-Induced Heating in Particle Accelerators and Applications impedance, coupling, site, wakefield 611
 
  • L. Sito, F. Giordano, G. Rumolo, B. Salvant, C. Zannini, E. de la Fuente
    CERN, Meyrin, Switzerland
  
  High-en­ergy par­ti­cle beams in­ter­act elec­tro­mag­net­i­cally with their sur­round­ings when they travel in­side an ac­cel­er­a­tor. These in­ter­ac­tions may cause beam-in­duced heat­ing of the ac­cel­er­a­tor’s com­po­nents, which could even­tu­ally lead to out­gassing, equip­ment degra­da­tion and phys­i­cal dam­age. The ex­pected beam-in­duced heat­ing can be re­lated to the beam cou­pling im­ped­ance, an elec­tro­mag­netic prop­erty of every ac­cel­er­a­tor de­vice. Ac­count­ing for beam-in­duced heat­ing is cru­cial both at the de­sign phase of an ac­cel­er­a­tor com­po­nent and for gain­ing an un­der­stand­ing of de­vices¿ fail­ures. In this paper, an in-house de­vel­oped Python tool to com­pute beam-in­duced heat­ing due to im­ped­ance is in­tro­duced. The dif­fer­ent fea­tures and ca­pa­bil­i­ties will be show­cased and ap­plied to real de­vices in the LHC and the in­jec­tor chain.  
poster icon Poster THBP52 [0.544 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-HB2023-THBP52  
About • Received ※ 29 September 2023 — Revised ※ 06 October 2023 — Accepted ※ 09 October 2023 — Issued ※ 11 October 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)