Keyword: impedance
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MOP023 The Conceptual Design Study for New BPM Signal Processing System of J-PARC (MR) operation, controls, network, FPGA 78
  • K. Satou, T. Toyama, S. Yamada
    KEK, Tokai, Ibaraki, Japan
  The BPM signal processing system, which is19 years old system, have been suffering from gain fluctuation due to contact resistance of the mechanical gain selector, communication disruption caused by an unstable contact of a card edge connector. In addition, it has a difficulty of repairments because some on-board parts have already reached end of product-life cycle, and some units have been in unusable situation. Presently, we are on the beam power upgrade campaign to 1.3 MW by increasing beam bunch current and shortening the MR operation cycle, and precise beam tunings would require massive waveform data processing and transfer to a storage than the present system. For this, we have been developing the system based on the 10 GbE optical link. The ADC board which is under development would perform direct sampling using the third harmonic of RF. The digital IQ demodulation technique is used to extract the baseband oscillation from the raw data. The obtained raw waveform as well as closed orbit data would be stored in the data storage system. In the presentation, we will report on the progress of development aimed at operation in 2025 and the conceptual design of the new system.  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-MOP023  
About • Received ※ 06 September 2023 — Revised ※ 07 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 19 September 2023
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WE1C03 THz Antenna-Coupled Zero-Bias Schottky Diode Detectors for Particle Accelerators detector, dipole, 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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WEP029 LANSCE QAC/DAQ Wire Scanner Instrumentation Upgrade controls, hardware, instrumentation, data-acquisition 415
  • L.S. Montoya, S.M. Johnson, H.A. Watkins, D.D. Zimmermann
    LANL, Los Alamos, New Mexico, USA
  Funding: Work supported by the U.S. Department of Energy, contract no. 89233218CNA000001. LA-UR-23-25124
High density instrumentation has been developed to upgrade wire scanner beam diagnostic capability in all areas downstream of the Coupled Cavity LINAC (CCL). Transverse beam profile measurements were originally obtained using legacy electronics known as Computer Automated Measurement and Control (CAMAC) crates. CAMAC has become obsolete, and a new wire scanner diagnostic system was developed as a replacement. With high wire scanner device density located in each area, instrumentation was developed to meet that need along with the ability to interface with legacy open-loop controlled actuators and be forward compatible with upgraded closed-loop systems. A high-density system was developed using a Quad Actuator Controller (QAC) and Data Acquisition (DAQ) chassis that pair together using a sequencer when taking measurements. Software improvements were also made, allowing for full waveform functionality that was previously unavailable. Deployment of 52 wire scanner locations in 2022 increased device availability and functionality across the facility. Hardware and software design details along with results from accelerator beam measurements are presented.
poster icon Poster WEP029 [2.359 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP029  
About • Received ※ 07 September 2023 — Revised ※ 11 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 20 September 2023
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WEP034 Effect of Longitudinal Beam-Coupling Impedance on the Schottky Spectrum of Bunched Beams synchrotron, simulation, coupling, proton 428
  • C. Lannoy, D. Alves, K. Łasocha, N. Mounet
    CERN, Meyrin, Switzerland
  • C. Lannoy, T. Pieloni
    EPFL, Lausanne, Switzerland
  Schottky spectra can be strongly affected by collective effects, in particular those arising from beam-coupling impedance when a large number of bunch charges are involved. In such conditions, the direct interpretation of the measured spectra becomes difficult, which prevents the extraction of beam and machine parameters in the same way as is usually done for lower bunch charges. Since no theory is yet directly applicable to predict the impact of impedance on such spectra, we use here time-domain, macro-particle simulations and apply a semi-analytical method to compute the Schottky spectrum for various machine and beam conditions, such as the ones found at the Large Hadron Collider. A simple longitudinal resonator-like impedance model is introduced in the simulations and its effect studied in different configurations, allowing preliminary interpretations of the impact of longitudinal impedance on Schottky spectra.  
poster icon Poster WEP034 [1.237 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP034  
About • Received ※ 05 September 2023 — Revised ※ 10 September 2023 — Accepted ※ 14 September 2023 — Issue date ※ 22 September 2023
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WEP042 Implementation of Transimpedance Analog Front-End Card for Los Alamos Neutron Science Center Accelerator Wire Scanners diagnostics, feedback, beam-diagnostic, electron 442
  • D. Rai, S.A. Baily, A.J. Braido, J.I. Duran, L.S. Kennel, H.L. Leffler, D. Martinez, L.S. Montoya, D.D. Zimmermann
    LANL, Los Alamos, New Mexico, USA
  Funding: Work supported by the U.S. Department of Energy, contract no. 89233218CNA000001. LA-UR-23-25123
The Los Alamos Neutron Science Center’s (LANSCE) Accelerator Operations and Technology division group executed a project that implemented a new analog front-end card (AFE) for their wire scanner’s Data Acquisition (DAQ) system. The AFE accommodates the signal amplification and noise reduction needed to acquire essential measurement data for beam diagnostics for the LANSCE accelerator. Wire Scanners are electro-mechanical beam interceptive devices that provide cross-sectional beam profile measurement data fitted to a Gaussian distribution that provides beam shape and position information. The beam operators use the beam shape and position information to adjust parameters such as acceleration, steering and focus on delivering an optimized beam to all targets. The project implemented software and hardware that eliminated the dependency on legacy systems and consolidated various AFE designs for diagnostics systems into a single design with 11 gain settings ranging from 100 nA to 40 mA at 10 V full scale to accommodate future applications on other diagnostic systems.
poster icon Poster WEP042 [2.193 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-WEP042  
About • Received ※ 07 September 2023 — Revised ※ 10 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 27 September 2023
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TH2C03 Analysis of the Transverse Schottky Signals in the LHC synchrotron, betatron, diagnostics, octupole 462
  • K. Łasocha, D. Alves
    CERN, Meyrin, Switzerland
  Schottky-based diagnostics are remarkably useful tools for the non-invasive monitoring of hadron beam and machine characteristics such as the betatron tune and the chromaticity. In this contribution recent developments in the analysis of the transverse Schottky signals measured at the Large Hadron Collider will be reported. A fitting-based technique, where the measured spectra are iteratively compared with theoretical predictions, will be presented and benchmarked with respect to the previously known methods and alternative diagnostic.  
slides icon Slides TH2C03 [4.054 MB]  
DOI • reference for this paper ※ doi:10.18429/JACoW-IBIC2023-TH2C03  
About • Received ※ 06 September 2023 — Revised ※ 08 September 2023 — Accepted ※ 13 September 2023 — Issue date ※ 19 September 2023
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)