Keyword: linear-collider
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MOPAB149 Ion Motion in Flat Beam Plasma Accelerators plasma, emittance, electron, collider 521
 
  • M. Yadav, C.E. Hansel, J.B. Rosenzweig
    UCLA, Los Angeles, California, USA
  • O. Apsimon, C.P. Welsch
    The University of Liverpool, Liverpool, United Kingdom
  • O. Apsimon, C.P. Welsch
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  
  Funding: This work was supported by UCLA and the STFC Liverpool Centre for Doctoral Training on Data Intensive Science (LIV. DAT) under grant agreement ST/P006752/1. This work is done on SCARF Cluster.
In­tense beams, such as those in pro­posed plasma based lin­ear col­lid­ers, can not only blow out elec­trons to form a bub­ble but can also at­tract ions to­wards the beam. This vi­o­lates the as­sump­tion that the ions are sta­tion­ary on the timescale of the beam, which is a com­mon as­sump­tion for shorter and less in­tense beams. While some re­search has been done on un­der­stand­ing the physics of ion mo­tion in blowout Plasma Wake­field Ac­cel­er­a­tors (PWFAs), this re­search has al­most ex­clu­sively fo­cused on cylin­dri­cally sym­met­ric beams, rather than flat asym­met­ric emit­tance beams which are often used in lin­ear col­lid­ers in order to min­i­mize beam­strahlung at the final focus. This con­tri­bu­tion in­ves­ti­gates both an­a­lyt­i­cally and com­pu­ta­tion­ally ion mo­tion of a flat beam sce­nario in order to un­der­stand the basic physics as well as how to mit­i­gate emit­tance growth, beam hos­ing and quadru­pole. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB149  
About • paper received ※ 24 May 2021       paper accepted ※ 17 June 2021       issue date ※ 11 August 2021  
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MOPAB352 High Power Test of a Dielectric Disk Loaded Accelerator for a Two Beam Wakefield Accelerator wakefield, acceleration, impedance, multipactoring 1096
 
  • B.T. Freemire, C.-J. Jing, S. Poddar
    Euclid Beamlabs, Bolingbrook, USA
  • M.E. Conde, D.S. Doran, G. Ha, W. Liu, J.G. Power, J.H. Shao, C. Whiteford, E.E. Wisniewski
    ANL, Lemont, Illinois, USA
  • M.M. Peng
    TUB, Beijing, People’s Republic of China
  • E.E. Wisniewski
    Illinois Institute of Technology, Chicago, Illinois, USA
  • Y. Zhao
    Euclid TechLabs, Solon, Ohio, USA
  
  Funding: Small Business Innovation Research Contract No. DE-SC0019864 U.S. DOE Office of Science Contract No. DE-AC02-06CH11357
As part of the Ar­gonne 500 MeV short pulse Two Beam Wake­field Ac­cel­er­a­tion Demon­stra­tor, a sin­gle cell X-band di­elec­tric disk loaded ac­cel­er­a­tor (DDA) has been de­signed, fab­ri­cated, and tested at high power at the Ar­gonne Wake­field Ac­cel­er­a­tor. The DDA should pro­vide a short pulse (~20 ns) high gra­di­ent (>300 MV/m) ac­cel­er­a­tor while main­tain­ing a rea­son­able r/Q and high group ve­loc­ity. This will allow a sig­nif­i­cantly larger RF-to-beam ef­fi­ciency than is cur­rently pos­si­ble for con­ven­tional ac­cel­er­at­ing struc­tures. A low loss bar­ium ti­tan­tate ce­ramic, µr = 50, was se­lected, and a low tem­per­a­ture braz­ing alloy cho­sen to pre­serve the di­elec­tric prop­er­ties of the ce­ramic dur­ing braz­ing. High power test­ing pro­duced break­down at the triple junc­tion, re­sult­ing from the braze joint de­sign. No ev­i­dence of break­down was ob­served on the iris of the disk, in­di­cat­ing that the max­i­mum sur­face elec­tric field on the di­elec­tric was not reached. An im­proved braze joint has been de­signed and is in pro­duc­tion, with high power test­ing to fol­low. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB352  
About • paper received ※ 19 May 2021       paper accepted ※ 08 June 2021       issue date ※ 21 August 2021  
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TUPAB013 A CLIC Dual Beam Delivery System for Two Interaction Regions solenoid, luminosity, detector, collider 1364
 
  • V. Cilento, R. Tomás García
    CERN, Geneva, Switzerland
  • A. Faus-Golfe
    Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
  
  The Com­pact Lin­ear Col­lider (CLIC) could pro­vide e+e− col­li­sions in two de­tec­tors si­mul­ta­ne­ously pos­si­bly at a rep­e­ti­tion fre­quency twice the de­sign value. In this paper, a novel dual Beam De­liv­ery Sys­tem (BDS) de­sign is pre­sented in­clud­ing op­tics de­signs and the eval­u­a­tion of lu­mi­nos­ity per­for­mance with syn­chro­tron ra­di­a­tion (SR) and so­le­noid ef­fects for both en­ergy stages of CLIC, 380 GeV and 3 TeV. In order to de­velop the novel op­tics de­sign, pa­ra­me­ters such as the lon­gi­tu­di­nal and the trans­verse de­tec­tor sep­a­ra­tions were op­ti­mized. The lu­mi­nos­ity per­for­mance of the novel CLIC scheme was eval­u­ated by com­par­ing the dif­fer­ent BDS de­signs for both en­ergy stages of CLIC. The dual CLIC BDS de­sign pro­vides a good lu­mi­nos­ity and proves to be a vi­able can­di­date for fu­ture lin­ear col­lider pro­jects.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB013  
About • paper received ※ 17 May 2021       paper accepted ※ 09 June 2021       issue date ※ 31 August 2021  
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TUPAB076 High-Gradient Breakdown Studies of an X-Band Accelerating Structure Operated in the Reversed Taper Direction linac, accelerating-gradient, klystron, collider 1543
 
  • X.W. Wu, N. Catalán Lasheras, A. Grudiev, G. McMonagle, I. Syratchev, W. Wuensch
    CERN, Meyrin, Switzerland
  • M. Boronat
    IFIC, Valencia, Spain
  • A. Castilla, A.V. Edwards, W.L. Millar
    Lancaster University, Lancaster, United Kingdom
  
  The re­sults of high-gra­di­ent tests of a ta­pered X-band trav­el­ing-wave ac­cel­er­a­tor struc­ture pow­ered in re­versed di­rec­tion are pre­sented. Pow­er­ing the ta­pered struc­ture from the small aper­ture, nor­mally out­put, at the end of the struc­ture pro­vides unique con­di­tions for the study of gra­di­ent lim­its. This al­lows high fields in the first cell for a com­par­a­tively low input power and a field dis­tri­b­u­tion that rapidly falls off along the length of the struc­ture. A max­i­mum gra­di­ent of 130 MV/m in the first cell at a pulse length of 100 ns was reached for an input power of 31.9 MW. De­tails of the con­di­tion­ing and op­er­a­tion at high-gra­di­ent are pre­sented. Var­i­ous break­down rate mea­sure­ments were con­ducted at dif­fer­ent power lev­els and rf pulse widths. The struc­ture was stan­dard T24 CLIC test struc­ture and was tested in Xbox-3 at CERN.  
poster icon Poster TUPAB076 [1.077 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB076  
About • paper received ※ 19 May 2021       paper accepted ※ 12 July 2021       issue date ※ 12 August 2021  
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TUPAB077 Novel Open Cavity for Rotating Mode SLED-Type RF Pulse Compressors cavity, coupling, klystron, GUI 1547
 
  • X.W. Wu, A. Grudiev
    CERN, Meyrin, Switzerland
  
  A new X-band high-power ro­tat­ing mode SLAC En­ergy Dou­bler (SLED)-type rf pulse com­pres­sor is pro­posed. It is based on a novel cav­ity type, a sin­gle open bowl-shape en­ergy stor­age cav­ity with high Q0 and com­pact size, which is cou­pled to the wave­guide using a com­pact ro­tat­ing mode launcher. The novel cav­ity type is ap­plied to the rf pulse com­pres­sion sys­tem of the main linac rf mod­ule of the kly­stron-based op­tion of the Com­pact Lin­ear Col­lider (CLIC). Quasi-spher­i­cal ro­tat­ing modes of \rm{TE}1,2,4 and \rm{TE}1,2,13 are pro­posed for the cor­rec­tion cav­ity and stor­age cav­ity of the rf pulse com­pres­sion sys­tem re­spec­tively. The stor­age cav­ity work­ing at \rm{TE}1,2,13 has a Q0 of 240000 and a di­am­e­ter less than 33 cm. The de­sign of the pulse com­pres­sor and in par­tic­u­lar of the high-Q cav­ity will be pre­sented in de­tail.  
poster icon Poster TUPAB077 [1.229 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB077  
About • paper received ※ 19 May 2021       paper accepted ※ 10 June 2021       issue date ※ 27 August 2021  
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WEPAB416 Industrialization Study of the Accelerating Structures for a 380 GeV Compact Linear Collider operation, survey, collider, factory 3674
 
  • A. Magazinik
    Tampere University, Tampere, Finland
  • N. Catalán Lasheras
    CERN, Meyrin, Switzerland
  • S. Mäkinen
    Tampere University of Technology, Tampere, Finland
  • J. Sauza-Bedolla
    Lancaster University, Lancaster, United Kingdom
  
  The LHC at CERN will con­tinue its op­er­a­tion for ap­prox­i­mately 20 years. In par­al­lel, di­verse stud­ies are con­ducted for the de­sign of a fu­ture large-scale ac­cel­er­a­tor. One of the op­tions is the Com­pact Lin­ear Col­lider (CLIC) who aims to pro­vide a very high ac­cel­er­at­ing gra­di­ent (100 MV/m) achieved by using nor­mal con­duct­ing ra­diofre­quency (RF) cav­i­ties op­er­at­ing in the X-band range (12 GHz). Each ac­cel­er­at­ing struc­ture is a chal­leng­ing com­po­nent in­volv­ing ul­tra-pre­cise ma­chin­ing and dif­fu­sion bond­ing tech­niques. The first stage of CLIC op­er­ates at a col­li­sion en­ergy of 380 GeV with an ac­cel­er­a­tor length of 11 km, con­sist­ing of 21630 ac­cel­er­at­ing struc­tures. Even though the pro­to­types have shown a ma­ture and ready to build con­cept, the pre­sent num­ber of qual­i­fied sup­pli­ers is lim­ited. There­fore, an in­dus­tri­al­iza­tion study was done through a tech­ni­cal sur­vey with hi-tech com­pa­nies. The aim is to eval­u­ate cur­rent ca­pa­bil­i­ties, to en­sure the nec­es­sary man­u­fac­tur­ing yield, sched­ule, and cost for mass pro­duc­tion. This paper pre­sents the re­sults of the in­dus­tri­al­iza­tion study for 12 GHz ac­cel­er­at­ing struc­tures for CLIC 380 GeV, high­light­ing the prin­ci­pal chal­lenges to­wards mass pro­duc­tion.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB416  
About • paper received ※ 19 May 2021       paper accepted ※ 22 June 2021       issue date ※ 14 August 2021  
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