WE1 —  Wednesday Session 1   (13-Sep-23   09:00—10:20)
Chair: J.H. Yue, IHEP, Beijing, People’s Republic of China
Paper Title Page
Online Bunch Length Monitoring for Storage Ring using a Fast Photodiode  
  • G. Hahn, C. Kim, D. Kim
    PAL, Pohang, Republic of Korea
  • J.-G. Hwang
    HZB, Berlin, Germany
  • W.J. Song
    POSTECH, Pohang, Republic of Korea
  Providing bunch lengths and a filling pattern of the bunch train in real-time is one of the important challenges in beam instrumentation of the 3rd generation light source. In particular, the time length and intensity information of the synchrotron light is useful to beamlines and their users who perform time-resolved experiments. We developed an online monitoring system that can measure bunch lengths and a filling pattern simultaneously by directly observing the synchrotron radiation with a picosecond-resolution photodiode and high input-analog-bandwidth digitizer. A Gaussian deconvolution method to restore the original waveform of synchrotron radiation using the system impulse response function was developed and adopted. In this paper, we present the experimental setup, signal processing method, and several machine study results in detail using the fast photodiode in the PLS-II  
slides icon Slides WE1I01 [3.975 MB]  
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The MAX IV Transverse Deflecting Cavity  
  • E. Mansten, S. Thorin
    MAX IV Laboratory, Lund University, Lund, Sweden
  The first streaked electrons in the new MAX IV Transverse deflecting cavity (TDC) were just achieved. The TDC consists of two 3 m long transverse deflecting RF structures, operating at S-band, with possibility to adjust the polarization of the deflecting fields. The TDC will use an energy doubling system (SLED) to increase the field in the cavities and along with a large beta function through the structure and a small beta focus at the detector, this will produce a time resolution of 1 fs. The first results of measurements are believed to be achieved within the next few months.  
slides icon Slides WE1I02 [3.650 MB]  
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WE1C03 THz Antenna-Coupled Zero-Bias Schottky Diode Detectors for Particle Accelerators 301
  • R. Yadav, S. Preu
    IMP, TU Darmstadt, Darmstadt, Germany
  • J.M. Klopf, M. Kuntzsch
    HZDR, Dresden, Germany
  • A. Penirschke
    THM, Friedberg, Germany
  Funding: The work is supported by the German Federal Ministry of Education and Research (BMBF) under contract no. 05K22RO1 for applications at HZDR, Dresden, LAS at KIT and DELTA at TU Dortmund.
Semiconductor-based broadband room-temperature Terahertz (THz) detectors are well suitable for beam diagnosis and alignment at accelerator facilities due to easy handling, compact size, no requirement of cooling, direct detection and robustness. Zero-Bias Schottky Diode (ZBSD) based THz detectors are highly sensitive and extremely fast, enabling the detection of picosecond scale THz pulses. This contribution gives an overview of direct THz detector technologies and applications. The ZBSD detector developed by our group has undergone several tests with table-top THz sources and also characterized with the free-electron laser (FEL) at HZDR Dresden, Germany up to 5.56 THz. In order to understand the rectification mechanism at higher THz frequencies, detector modelling and optimization is essential for a given application. We show parametric analysis of a antenna-coupled ZBSD detector by using 3D electromagnetic field simulation software (CST). The results will be used for optimization and fabrication of next generation ZBSD detectors, which are planned to be commissioned at THz generating FEL accelerator facilities in near future.
[1] R. Yadav et al., doi:10.3390/s23073469
[2] M. Hoefleet al., doi:10.1109/IRMMW-THz.2013.6665893
[3] R. Yadav et al., doi:10.18429/JACoW-IPAC2022-MOPOPT013
slides icon Slides WE1C03 [6.016 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WE1C03  
About • Received ※ 04 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 15 September 2023 — Issue date ※ 30 September 2023
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