Author: Chehab, R.
Paper Title Page
TUXB05
 Intense Channeling Radiation as a Tool for a Hybrid Crystal-Based Positron Source for Future Colliders  
 
  • L. Bandiera, A. Mazzolari, M. Romagnoni, A.I. Sytov
    INFN-Ferrara, Ferrara, Italy
  • L. Bomben, V. Mascagna
    INFN MIB, MILANO, Italy
  • G. Cavoto
    INFN-Roma, Roma, Italy
  • I. Chaikovska, R. Chehab
    Université Paris-Saclay, CNRS/IN2P3, IJCLab, Orsay, France
  • D. De Salvador
    Univ. degli Studi di Padova, Padova, Italy
  • L.G. Foggetta
    INFN/LNF, Frascati, Italy
  • E. Lutsenko, M. Prest
    Università dell’Insubria & INFN Milano Bicocca, Como, Italy
  • M. Soldani
    Università degli Studi di Ferrara, Ferrara, Italy
  • V.V. Tikhomirov
    INP BSU, Minsk, Belarus
  • E. Vallazza
    INFN-Trieste, Trieste, Italy
  
  There is a strong need for in­tense positron sources for fu­ture col­lid­ers. A crys­tal-based hy­brid positron source could be an al­ter­na­tive to con­ven­tional sources based on the e- con­ver­sion into e+ in a thick tar­get. The basic idea of the hy­brid source is to split the e+ con­verter into a gamma-quanta ra­di­a­tor plus a gamma-to-positron con­verter*. In such a scheme an e- beam crosses a thin ax­i­ally ori­ented crys­tal with emis­sion of "chan­nel­ing ra­di­a­tion", char­ac­ter­ized by a con­sid­er­ably larger amount of pho­tons w.r.t. stan­dard bremsstrahlung**. The net re­sult is an in­crease in the num­ber of e+ pro­duced at the con­verter tar­get. In the hy­brid scheme, only pho­tons reach the con­verter, thereby re­duc­ing the Peak En­ergy De­po­si­tion Den­sity (PEDD) in the tar­get. Here we pre­sent the re­sults of a test con­ducted at the DESY TB with 5.6 GeV e- in­ter­act­ing with a W crys­tal. A huge en­hance­ment in the ra­di­ated en­ergy and in the pho­ton emis­sion has been recorded and re­pro­duced with Monte Carlo sim­u­la­tions***. This study is rel­e­vant for the de­sign of the FCC-ee positron source. In­deed, through Monte Carlo, we also in­ves­ti­gated the best pa­ra­me­ters of the crys­tal ra­di­a­tor suited for the FCC-ee e+ source.
* R. Chehab et al. PAC’89,10.1109/PAC.1989.73147
** X.Artru et al. NIMB 266 (2008) 3868
*** A. Sytov, V. Tikhomirov, L. Bandiera PRAB 22 (2019) 064601
 
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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.  
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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  
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