Author: Ma, L.
Paper Title Page
WEPAB013 A New Algorithm for Positron Source Parameter Optimisation 2609
 
  • Y. Zhao, L. Ma
    SDU, Shandong, People’s Republic of China
  • S. Döbert, A. Latina
    CERN, Geneva, Switzerland
  
  In this re­port, we pro­posed a new sim­ple and ef­fi­cient al­go­rithm for positron source pa­ra­me­ter op­ti­mi­sa­tion, which is based on it­er­a­tions of scan of free pa­ra­me­ters in the sim­u­la­tion. The new al­go­rithm is fast, sim­ple and con­vinc­ing since the re­sults can be vi­su­ally drawn and flex­i­bly tuned and it has an ad­van­tage that it can eas­ily han­dle re­al­is­tic para­met­ric prob­lems with more than one ob­jec­tive quan­ti­ties to op­ti­mise. The op­ti­mi­sa­tion of the main pa­ra­me­ters of the CLIC positron source at the 380 GeV stage is pre­sented as an ex­am­ple to demon­strate how the al­go­rithm works.  
poster icon Poster WEPAB013 [1.352 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB013  
About • paper received ※ 15 May 2021       paper accepted ※ 24 June 2021       issue date ※ 17 August 2021  
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WEPAB014 Optimisation of the CLIC Positron Source 2613
 
  • Y. Zhao, L. Ma
    SDU, Shandong, People’s Republic of China
  • H.M.A. Bajas, S. Döbert, A. Latina
    CERN, Geneva, Switzerland
  
  In this re­port, we re­op­ti­mised the CLIC positron source at all col­li­sion en­ergy stages. Sim­u­la­tion, op­ti­mi­sa­tion al­go­rithm and re­sults were all im­proved com­pared with pre­vi­ous stud­ies. Two dif­fer­ent tar­get schemes were stud­ied and com­pared in terms of the ad­van­tages and dis­ad­van­tages. The spot size of the in­jected elec­tron beam was also op­ti­mised to achieve a com­pro­mise be­tween large positron yields and safe en­ergy de­po­si­tion. The match­ing de­vice for the cap­ture of positrons was sim­u­lated and op­ti­mised with both im­proved an­a­lytic and re­al­is­tic field maps. Con­i­cal aper­ture and front and rear gaps of the match­ing de­vice were also con­sid­ered for the first time. The op­ti­mised positron source is ex­pected to have the low­est cost.  
poster icon Poster WEPAB014 [1.825 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB014  
About • paper received ※ 15 May 2021       paper accepted ※ 21 June 2021       issue date ※ 25 August 2021  
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WEPAB015 Comparison of Different Matching Device Field Profiles for the FCC-ee Positron Source 2617
 
  • Y. Zhao, L. Ma
    SDU, Shandong, People’s Republic of China
  • B. Auchmann, P. Craievich, J. Kosse, R. Zennaro
    PSI, Villigen PSI, Switzerland
  • I. Chaikovska, R. Chehab
    Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
  • S. Döbert, A. Latina
    CERN, Geneva, Switzerland
  • P.V. Martyshkin
    BINP SB RAS, Novosibirsk, Russia
  
  In this re­port, we com­pared dif­fer­ent match­ing de­vice field pro­files for the FCC-ee positron source. The match­ing de­vice is used to cap­ture positrons with mag­netic field. A flux con­cen­tra­tor was de­signed with a con­i­cal inner cham­ber. A smaller aper­ture and a larger aper­ture were stud­ied. An an­a­lytic field pro­file was also stud­ied using an adi­a­batic for­mula. The peak field of the an­a­lytic pro­file as well as beam and tar­get pa­ra­me­ters was op­ti­mised to achieve a max­i­mum positron yield. A safe en­ergy de­po­si­tion in the tar­get was guar­an­teed by re­quir­ing a con­straint on the de­posited power and peak en­ergy de­po­si­tion den­sity.  
poster icon Poster WEPAB015 [3.066 MB]  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2021-WEPAB015  
About • paper received ※ 15 May 2021       paper accepted ※ 23 June 2021       issue date ※ 30 August 2021  
Export • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)