Author: Wu, X.W.
Paper Title Page
TUPAB074 S-Band Transverse Deflecting Structure Design for CompactLight 1540
 
  • X.W. Wu, W. Wuensch
    CERN, Meyrin, Switzerland
  • S. Di Mitri
    Elettra-Sincrotrone Trieste S.C.p.A., Basovizza, Italy
  • N. Thompson
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  
  The Com­pact­Light pro­ject is cur­rently de­vel­op­ing the de­sign of a next gen­er­a­tion hard X-ray FEL fa­cil­ity, which is based on high-gra­di­ent X-band (12 GHz) struc­tures. How­ever, to carry out pump-and-probe ex­per­i­ments in the pro­ject, two-bunch op­er­a­tion with a spac­ing of 10 X-band rf cy­cles is pro­posed. A sub-har­monic trans­verse de­flect­ing struc­ture work­ing at S-band is pro­posed to di­rect the two bunches into two sep­a­rate FEL lines. The two FEL pulses will have in­de­pen­dently tun­able wave­lengths and can be com­bined in a sin­gle ex­per­i­ment with a tem­po­ral delay be­tween pulses of ± 100 fs. The rf de­sign of the trans­verse de­flec­tor is pre­sented in this paper.  
poster icon Poster TUPAB074 [1.557 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-TUPAB074  
About • paper received ※ 19 May 2021       paper accepted ※ 10 June 2021       issue date ※ 21 August 2021  
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TUPAB076 High-Gradient Breakdown Studies of an X-Band Accelerating Structure Operated in the Reversed Taper Direction 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 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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FRXB02 Development of 36 GHz RF Systems for RF Linearisers 4518
 
  • A. Castilla, G. Burt
    Lancaster University, Lancaster, United Kingdom
  • M. Behtouei, B. Spataro
    INFN/LNF, Frascati, Italy
  • G. Burt
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • J.C. Cai, A. Castilla, A. Latina, X. Liu, I. Syratchev, X.W. Wu, W. Wuensch
    CERN, Meyrin, Switzerland
  • J.C. Cai, A. Castilla
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  • A.W. Cross, L. Zhang
    USTRAT/SUPA, Glasgow, United Kingdom
  • L.J.R. Nix
    University of Strathclyde, Glasgow, United Kingdom
  
  Funding: This project has received funding from the European Union’s Horizon2020 research and innovation programme under grant agreement No 777431.
As part of the deign stud­ies, the Com­pact­Light pro­ject plans to use an in­jec­tor in the C-band. Which con­sti­tutes a par­tic­u­lar com­pli­ca­tion for the har­monic sys­tem in charge of lin­earis­ing the beam’s phase space, since it means its op­er­a­tion fre­quency could be higher than the stan­dard X-band RF tech­nolo­gies. In the pre­sent work, we in­ves­ti­gated a 36 GHz (Ka-band) as the ideal fre­quency for the har­monic sys­tem. A set of struc­ture de­signs are pre­sented as can­di­dates for the lin­eariser, based on dif­fer­ent pow­er­ing schemes and pulse com­pres­sor tech­nolo­gies. The com­par­i­son is made both in terms of beam dy­nam­ics and RF per­for­mance. Given the phase sta­bil­ity re­quire­ments for the MW class RF sources needed for this sys­tem, we per­formed care­ful stud­ies of a Gyro-Kly­stron and a multi-beam kly­stron as po­ten­tial RF sources, with both show­ing up to 3 MW avail­able power using mod­er­ate mod­u­la­tor volt­ages. Al­ter­na­tives for pulse com­pres­sion at Ka-band are also dis­cussed in this work. 		 
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-FRXB02  
About • paper received ※ 17 May 2021       paper accepted ※ 19 July 2021       issue date ※ 25 August 2021  
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