Keyword: factory
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TU2I02 First Direct Measurement of Electron and Positron Bunch Characteristics during Positron Capture Process at the Positron Source of the SuperKEKB B-Factory positron, target, operation, electron 146
  • T. Suwada
    KEK, Ibaraki, Japan
  Electron (e-) and positron (e+) bunch characteristics were directly measured for the first time using wideband beam monitors (WBMs) and a detection system at the e+ source of the SuperKEKB B-factory. Both secondarily-generated e- and e+ bunches after the e±production target were clearly identified in their dynamical capture process at locations of the WBMs under two-bunch acceleration scheme. Not only the longitudinal but also transverse bunch characteristics, the time intervals between the e- and e+ bunches, the bunch lengths, transverse bunch positions, and bunch charges were simultaneously separately measured for each bunch as functions of the capture phase to investigate their dynamical capture process. The results show that quite symmetric dynamical behaviors for the e- and e+ bunch characteristics were clearly observed. The new WBMs open up a new window for direct measurements of both the e- and e+ bunches during their dynamical capture process and in the optimization procedure of the e+ bunch intensity in multidimensional parameter spaces at any e+ sources. The historical backgrounds for introducing and implementing the new WBMs are also described in this report.  
slides icon Slides TU2I02 [2.925 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TU2I02  
About • Received ※ 07 August 2023 — Revised ※ 08 September 2023 — Accepted ※ 12 September 2023 — Issue date ※ 22 September 2023
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