TU2 —  Tuesday Session 2   (12-Sep-23   10:50—12:30)
Chair: P. Krejcik, SLAC, Menlo Park, California, USA
Paper Title Page
Overview of Beam Diagnostics for Different Accelerator Types: Longitudinal Profile  
  • N. Hiller, V. Schlott
    PSI, Villigen PSI, Switzerland
  A tutorial on longitudinal beam diagnostics systems for different accelerator types.  
slides icon Slides TU2T01 [37.690 MB]  
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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 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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TU2C03 Sub-20 fs Synchronization Between Mode-Locked Laser and Radio Frequency Signal 151
  • J.G. Wang, B. Liu, W. Wu
    SARI-CAS, Pudong, Shanghai, People’s Republic of China
  The femtosecond synchronization and distribution system of the Shanghai soft X-ray free-electron laser facility (SXFEL) and Shanghai high repetition rate XFEL and extreme light facility (SHINE) are based on the optical pulse trains generated by passively mode-locked lasers. The passively mode-locked laser has ultralow noise in the high offset frequency (<5 fs, [1 kHz- 1 MHz]). In this paper, we report precise synchronization of the low-noise passively mode-locked laser to the radio frequency (RF) master oscillator. RF-based phase-locked loop scheme, the absolute jitter of the phase-locked passively mode-locked laser is less than 20 fs integrated from 10 Hz up to 1 MHz.  
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DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TU2C03  
About • Received ※ 29 August 2023 — Revised ※ 09 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 02 October 2023
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