Keyword: RF-structure
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MOPAB355 Multi-Objective Optimization of RF Structures cavity, impedance, controls, ECR 1103
 
  • S.J. Smith, R. Apsimon, G. Burt, M.J.W. Southerby
    Cockcroft Institute, Lancaster University, Lancaster, United Kingdom
  • S. Setiniyaz
    Cockcroft Institute, Warrington, Cheshire, United Kingdom
  • S. Setiniyaz
    Lancaster University, Lancaster, United Kingdom
  
  In this work, we apply multi-ob­jec­tive op­ti­miza­tion meth­ods to sin­gle-cell cav­ity mod­els gen­er­ated using non-uni­form ra­tio­nal basis splines (NURBS). This mod­el­ing method uses con­trol points and a NURBS to gen­er­ate the cav­ity geom­e­try, which al­lows for greater flex­i­bil­ity in the shape, lead­ing to im­proved per­for­mance. Using this ap­proach and multi-ob­jec­tive ge­netic al­go­rithms (MOGAs) we find the Pareto fron­tiers for the typ­i­cal key quan­ti­ties of in­ter­est (QoI) in­clud­ing peak fields, shunt im­ped­ance and the mod­i­fied Poynt­ing vec­tor. Vi­su­al­iz­ing these re­sults be­comes in­creas­ingly more dif­fi­cult as the num­ber of ob­jec­tives in­creases, there­fore, in order to un­der­stand these fron­tiers, we pro­vide sev­eral tech­niques for an­a­lyz­ing, vi­su­al­iz­ing and using multi-di­men­sional Pareto fronts specif­i­cally for RF cav­ity de­sign.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB355  
About • paper received ※ 19 May 2021       paper accepted ※ 15 July 2021       issue date ※ 30 August 2021  
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MOPAB371 A Coupon Tester for Normal Conducting High-Gradient Materials cavity, coupling, vacuum, klystron 1147
 
  • J.W. Lewellen, D. Gorelov, D. Perez, E.I. Simakov
    LANL, Los Alamos, New Mexico, USA
  • M.E. Schneider
    Michigan State University, East Lansing, Michigan, USA
  
  Funding: Los Alamos National Laboratory LDRD Program
A coupon tester is an RF struc­ture used to sub­ject a ma­te­r­ial sam­ple to very high RF fields, with the fields on the sam­ple, or coupon, being higher than else­where in the cav­ity. To date, most such cav­i­ties were orig­i­nally in­tended to ex­plore the RF prop­er­ties of su­per­con­duct­ing ma­te­ri­als, and can ex­pose the sam­ple to strong mag­netic fields, but weak to no elec­tric fields. As part of a pro­gram to de­velop ma­te­ri­als and struc­tures for high-gra­di­ent (> 100 MV/m), low-break­down-rate nor­mal-con­duct­ing ac­cel­er­a­tors, we have de­signed a C-band (5.712 GHz) cav­ity in­tended to sub­ject sam­ples to both mag­netic and elec­tric fields com­pa­ra­ble to those ex­pe­ri­enced in high-gra­di­ent struc­ture de­signs, using a TM-mode cav­ity; the elec­tric and mag­netic fields along the sam­ple coupon can be di­rectly com­pared to the fields on the iris of high-gra­di­ent struc­tures. This poster will pre­sent the de­sign cri­te­ria for our coupon tester cav­ity, nom­i­nal op­er­at­ing pa­ra­me­ters, and our struc­ture con­cept. The cav­ity de­sign will be re­fined over the next sev­eral months, and will be con­structed and in ser­vice near the start of 2022. 		 
poster icon Poster MOPAB371 [0.764 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-MOPAB371  
About • paper received ※ 17 May 2021       paper accepted ※ 26 May 2021       issue date ※ 30 August 2021  
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WEPAB295 Parameter Estimation of Short Pulse Normal-Conducting Standing Wave Cavities cavity, gun, coupling, resonance 3351
 
  • S. Pfeiffer, J. Branlard, F. Burkart, M. Hoffmann, H. Schlarb
    DESY, Hamburg, Germany
  
  The lin­ear ac­cel­er­a­tor ARES (Ac­cel­er­a­tor Re­search Ex­per­i­ment at SIN­BAD) is a new re­search fa­cil­ity at DESY. Elec­tron bunches with a max­i­mum rep­e­ti­tion rate of 50 Hz are ac­cel­er­ated to a tar­get en­ergy of 155 MeV. The fa­cil­ity aims for ul­tra-sta­ble sub-fem­tosec­ond ar­rival-times and high peak-cur­rents at the ex­per­i­ment, plac­ing high de­mands on the ref­er­ence dis­tri­b­u­tion and field reg­u­la­tion of the RF struc­ture. In this con­tri­bu­tion, we pre­sent the phys­i­cal pa­ra­me­ter es­ti­ma­tion of key RF prop­er­ties such as cav­ity de­tun­ing not di­rectly mea­sur­able on the RF field decay. The method can be used as a fast mon­i­tor of inner cell tem­per­a­ture. The es­ti­mated prop­er­ties are fi­nally com­pared with the mea­sured ones.  
poster icon Poster WEPAB295 [0.860 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB295  
About • paper received ※ 19 May 2021       paper accepted ※ 05 July 2021       issue date ※ 26 August 2021  
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THPAB223 Energy Compression System Radio Frequency Design at the Canadian Light Source linac, impedance, GUI, simulation 4231
 
  • E.J. Ericson, D. Bertwistle, M.J. Boland
    CLS, Saskatoon, Saskatchewan, Canada
  
  The Cana­dian Light Source (CLS), Canada’s only syn­chro­tron light source, is con­sid­er­ing a lin­ear ac­cel­er­a­tor (LINAC) up­grade. As a re­sult, the radio fre­quency (RF) struc­ture in the down­stream En­ergy Com­pres­sion Sys­tem (ECS) needs to be re­designed. In this paper, we de­scribe the de­sign process fol­lowed to de­ter­mine the geom­e­try of the RF struc­ture cells and cou­pler.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-THPAB223  
About • paper received ※ 18 May 2021       paper accepted ※ 28 July 2021       issue date ※ 28 August 2021  
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