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)