Author: Lu, X.
Paper Title Page
MOPA74 Design of a W-Band Corrugated Waveguide for Structure Wakefield Acceleration 210
 
  • B. Leung, X. Lu, C.L. Phillips, P. Piot
    Northern Illinois University, DeKalb, Illinois, USA
  • D.S. Doran, X. Lu, P. Piot, J.G. Power
    ANL, Lemont, Illinois, USA
  
  Cur­rent re­search on struc­ture wake­field ac­cel­er­a­tion aims to de­velop ra­dio-fre­quency struc­tures that can pro­duce high gra­di­ents, with work in the sub-ter­a­hertz regime being par­tic­u­larly in­ter­est­ing be­cause of the po­ten­tial to cre­ate more com­pact and eco­nom­i­cal ac­cel­er­a­tors. Metal­lic cor­ru­gated wave­guides at sub-ter­a­hertz fre­quen­cies are one such struc­ture. We have de­signed a W-band cor­ru­gated wave­guide for a collinear wake­field ac­cel­er­a­tion ex­per­i­ment at the Ar­gonne Wake­field Ac­cel­er­a­tor (AWA). Using the CST Stu­dio Suite, we have op­ti­mized the struc­ture for the max­i­mum achiev­able gra­di­ent in the wake­field from a nom­i­nal AWA elec­tron bunch at 65 MeV. Sim­u­la­tion re­sults from dif­fer­ent solvers of CST were bench­marked with each other, with an­a­lyt­i­cal mod­els, and with an­other sim­u­la­tion code, ECHO. We are in­ves­ti­gat­ing the me­chan­i­cal de­sign, suit­able fab­ri­ca­tion tech­nolo­gies, and the pos­si­bil­ity to apply ad­vanced bunch shap­ing tech­niques to im­prove the struc­ture per­for­mance.  
poster icon Poster MOPA74 [1.518 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-MOPA74  
About • Received ※ 30 July 2022 — Revised ※ 03 August 2022 — Accepted ※ 07 August 2022 — Issue date ※ 26 August 2022
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TUPA28 Update on the Development of a Low-Cost Button BPM Signal Detector at AWA 409
 
  • W. Liu, G. Chen, D.S. Doran, S.Y. Kim, X. Lu, P. Piot, J.G. Power, C. Whiteford, E.E. Wisniewski
    ANL, Lemont, Illinois, USA
  • E.E. Wisniewski
    IIT, Chicago, Illinois, USA
  
  Funding: Work supported by the US Department of Energy, Office of Science.
A sin­gle-pulse, high dy­namic range, cost-ef­fec­tive BPM sig­nal de­tec­tor has been on the most wanted list of the Ar­gonne Wake­field Ac­cel­er­a­tor (AWA) Test Fa­cil­ity for many years. The unique ca­pa­bil­i­ties of the AWA beam­line re­quire BPM in­stru­men­ta­tion with an un­prece­dented dy­namic range, thus a cost-ef­fec­tive so­lu­tion could be chal­leng­ing to de­sign and pro­to­type. With the help of a bet­ter cir­cuit model for a but­ton BPM sig­nal source, we are able to do the cir­cuit sim­u­la­tions with more re­al­is­tic input sig­nals and make pre­dic­tions much closer to re­al­i­ties. Our most re­cent de­sign and pro­to­type re­sults are shared in this paper. 		 
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-TUPA28  
About • Received ※ 01 August 2022 — Revised ※ 08 August 2022 — Accepted ※ 11 August 2022 — Issue date ※ 09 October 2022
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WEYD4 Design and Fabrication of a Metamaterial Wakefield Accelerating Structure 564
 
  • D.C. Merenich, X. Lu
    Northern Illinois University, DeKalb, Illinois, USA
  • D.S. Doran, X. Lu, J.G. Power
    ANL, Lemont, Illinois, USA
  
  Meta­ma­te­ri­als (MTMs) are en­gi­neered ma­te­ri­als that can show ex­otic elec­tro­mag­netic prop­er­ties such as si­mul­ta­ne­ously neg­a­tive per­mit­tiv­ity and per­me­abil­ity. MTMs are promis­ing can­di­dates for struc­ture-based wake­field ac­cel­er­a­tion struc­tures, which can mit­i­gate the im­pact of radio fre­quency (RF) break­down, thus achiev­ing a high gra­di­ent. Pre­vi­ous ex­per­i­ments car­ried out at the Ar­gonne Wake­field Ac­cel­er­a­tor (AWA) suc­cess­fully demon­strated MTM struc­tures as ef­fi­cient power ex­trac­tion and trans­fer struc­tures (PETS) from a high-charge drive beam. Here we pre­sent the de­sign, fab­ri­ca­tion, and cold test of an X-band MTM ac­cel­er­a­tor struc­ture for ac­cel­er­a­tion of the wit­ness beam in the two-beam ac­cel­er­a­tion scheme. The MTM struc­ture de­sign was per­formed using the CST Stu­dio Suite, with the unit cell and the com­plete multi-cell pe­ri­odic struc­ture both op­ti­mized for high gra­di­ent. Cold test of the fab­ri­cated struc­ture shows good agree­ment with sim­u­la­tion re­sults. Fu­ture work in­cludes a beam test at AWA to study the short-pulse RF break­down physics in the MTM struc­ture, as an im­por­tant com­po­nent to­wards a fu­ture com­pact lin­ear col­lider based on two-beam ac­cel­er­a­tion.  
slides icon Slides WEYD4 [2.322 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-NAPAC2022-WEYD4  
About • Received ※ 03 August 2022 — Revised ※ 09 August 2022 — Accepted ※ 10 August 2022 — Issue date ※ 31 August 2022
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)