Keyword: dipole
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WE1C03 THz Antenna-Coupled Zero-Bias Schottky Diode Detectors for Particle Accelerators detector, impedance, radiation, electron 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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WEP014 Measuring Electromagnet Polarity Using Magnetic Remanence power-supply, quadrupole, MMI, booster 354
  • K.P. Wootton
    ANL, Lemont, Illinois, USA
  Funding: This research used resources of the Advanced Photon Source, operated for the U.S. Department of Energy Office of Science by Argonne National Laboratory under Contract No. DE-AC02-06CH11357.
Large accelerator systems typically include many individually powered electromagnets. An important activity prior to commissioning with beam is verifying that the polarity of the installed magnets matches the design lattice. In the present work, we motivate the measurement of magnet polarity in a manner that is electrically safe, by measuring the magnetic remanence of iron yokes of normal conducting electromagnets. This has been used to confirm the polarities of iron-dominated dipole and quadrupole electromagnets at the Linac Extension Area at the Advanced Photon Source.
poster icon Poster WEP014 [0.504 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP014  
About • Received ※ 24 July 2023 — Revised ※ 08 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 29 September 2023
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WEP035 Statistical Properties of Schottky Spectra simulation, synchrotron, betatron, diagnostics 433
  • C. Lannoy, D. Alves, K. Łasocha, N. Mounet
    CERN, Meyrin, Switzerland
  • C. Lannoy, T. Pieloni
    EPFL, Lausanne, Switzerland
  Schottky signals are used for non-invasive beam diagnostics as they contain information on various beam and machine parameters. The instantaneous Schottky signal is, however, only a single realisation of a random process, implicitly depending on the discrete distribution of synchrotron and betatron amplitudes and phases among the particles. To estimate the expected value of the Schottky power spectrum, and reveal the inner structure of the Bessel satellites described by the theory, the averaging of instantaneous Schottky spectra is required. This study describes this procedure quantitatively by analysing the statistical properties of the Schottky signals, including the expected value and variance of Schottky power spectra. Furthermore, we investigate how these quantities evolve with the number of particles in the bunch, the observed harmonic of the revolution frequency, the distribution of synchrotron oscillation amplitudes, and the bunch profile. The theoretical findings are compared against macro-particle simulations as well as Monte Carlo computations.  
poster icon Poster WEP035 [3.908 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP035  
About • Received ※ 05 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 29 September 2023  
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