Author: Napieralski, A.
Paper Title Page
TUPOST016 Status of LLRF and Resonance Control Dedicated Algorithms Extension for PolFEL 880
 
  • W. Jalmuzna, W. Cichalewski, A. Napieralski, P.S. Sekalski
    TUL-DMCS, Łódź, Poland
 
  PolFEL (POLish Free Electron Laser) is the new super-conducting based facility, which is under construction in Poland. It will provide a continuous electron beam with energy up to 160 MeV, which will be converted to light pulses with wavelengths as short as 150 nm. CW (Continuous Wave) operation of the superconducting linear accelerator with narrow bandwidth and high electromagnetic field gradient (presumably above 30 MV/m for single structure) creates new challenges while dealing with RF field stability, the influence of mechanical de-tuning of resonating structures and must take into account all limits induced by power amplifiers and cryo-system. The real-time control algorithm responsible for RF field, motor tuners, and piezo control must strictly interact with each other to provide the satisfactory performance of the whole facility. In addition, constant monitoring of such parameters as detuning, bandwidth, power margins of the amplifier, state of cavities must be done. The paper presents the current status of implementation of PolFEL’s LLRF Controller (extending GDR to other modes of operation as SEL, PLL) and Piezo Controller (both hardware and firmware layers).  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-TUPOST016  
About • Received ※ 08 June 2022 — Revised ※ 14 June 2022 — Accepted ※ 15 June 2022 — Issue date ※ 03 July 2022
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)  
 
TUPOST017 PEG Contribution to the LLRF System for Superconducting Elliptical Cavities of ESS Accelerator Linac 884
 
  • W. Cichalewski, G.W. Jabłoński, K. Klys, D.R. Makowski, A. Mielczarek, A. Napieralski, P. Perek, P. Plewinski
    TUL-DMCS, Łódź, Poland
  • A. Abramowicz, K. Czuba, M.G. Grzegrzółka, K. Oliwa, I. Rutkowski, W. Wierba
    Warsaw University of Technology, Institute of Electronic Systems, Warsaw, Poland
  • P.R. Bartoszek, K. Chmielewski, K. Kostrzewa, T. Kowalski, D. Rybka, M. Sitek, J. Szewiński, Z. Wojciechowski
    NCBJ, Świerk/Otwock, Poland
  • M. Jensen
    ESS, Lund, Sweden
  • A.J. Johansson, A.M. Svensson
    Lund University, Lund, Sweden
 
  The LLRF (Low-Level Radio Frequency) system optimizes energy transfer from the superconducting resonator to the accelerating beam. At ESS, one LLRF system regulates a single cavity. This digital system’s HW platform is the MTCA.4 standard. The system has been co-designed by ESS, Lund University, and the PEG (Polish Electronic Group) consortium. The PEG is also responsible for the system components design, evaluation, and production (like Local Oscillator Rear transition module, piezo tuner driver RTM, RTM carrier board, and others). The PEG delivers a HW/SW cavity simulator, an LLRF system test-stand, and provides necessary integration and installation services required for complete system preparation for the linac commissioning and operation phase. The paper summarizes the PEG work on the development and preparation of the LLRF systems for the ESS elliptical structures. The efforts concerning hardware and software components prototyping and evaluation are discussed. Moreover, we present the current status of the project, including components mass production, integration, and installation work.  
DOI • reference for this paper ※ https://doi.org/10.18429/JACoW-IPAC2022-TUPOST017  
About • Received ※ 08 June 2022 — Revised ※ 16 June 2022 — Accepted ※ 19 June 2022 — Issue date ※ 20 June 2022
Cite • reference for this paper using ※ BibTeX, ※ LaTeX, ※ Text/Word, ※ RIS, ※ EndNote (xml)