Design and evaluation of a downconverter based on MicroTCA.4

  • Modern low-level RF (LLRF) control systems of particle accelerators are designed to achieve extremely precise field amplitude and phase regulation inside the accelerating cavities. The RF field signal is usually converted to an intermediate frequency (IF) before being sampled by ADC. As the down-conversion is an important procedure of digital signal processing in LLRF system, designing a high performance and broad band downconverter compatible with various accelerators is important. In this paper, the design of a downconverter based on MicroTCA and its performance evaluation on different frequency points are presented. The major design objective of this module is a wider operating frequency range and more flexibility in application.
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  • [1] T. Wamsat, N. Baboi, B. Lorbeer et al, Performance of a Downconverter Test-electronics with MTCA-based Digitizers for Beam Position Monitoring in 3.9 GHz Accelerating Cavities, in Proceedings of the International Beam Instrumentation Conference, IBIC2012, edited by T. Mitsuhashi and A. Shirakawa (Japan:JACoW, 2012), p. 386
    [2] S. Simrock, V. Ayvazyan, A. Brandt et al, Conceptual LLRF Design for the European XFEL, in Proceedings of the 23rd International Linac Conference, edited by S. Henderson (USA:JACoW, 2006), p. 559
    [3] T. Miura, M. Akemoto, A. Akiyama et al, Performance of RF systems for compact-ERL main linac at KEK, in Proceedings of the 5th International Particle Accelerator Conference, IPAC2014, edited by C. Petit-Jean-Genaz, G. Arduini, P. Michel et al (Germany:JACoW, 2014), p. 2450
    [4] https://www.picmg.org/openstandards/microtca, retrieved 22th August 2011
    [5] U. Mavric, K. Czuba, F. Ludwig et al, Multi-channel down-conversion for MicroTCA.4 based control systems, in Proceedings of the 19th Real Time Conference, 2014 IEEE-NPSS
    [6] M. Hoffmann, F. Ludwig, H. Schlarb et al, Multichannel Downconverter for the Next Generation RF Field Control for VUV- and X-ray Free Electron Lasers, in Proceedings of the 22nd Particle Accelerator Conference, edited by C. Petit-Jean-Genaz (USA:JACow, 2007), p. 2071
    [7] U. Mavric, J. Branlard, B. Chase et al, A 96 channel receiver for the ILCTA LLRF system at fermilab, in Proceedings of the 22nd Particle Accelerator Conference, edited by C. Petit-Jean-Genaz (USA:JACow, 2007), p. 2271
    [8] Z. C. Fu, Y. B. Zhao, Z. T. Zhao, Nuclear Techniques, 33(9):649-652(2010)
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Nan Gan, Rong Liu, Xin-Peng Ma and Yun-Long Chi. Design and evaluation of a downconverter based on MicroTCA.4[J]. Chinese Physics C, 2016, 40(7): 077004. doi: 10.1088/1674-1137/40/7/077004
Nan Gan, Rong Liu, Xin-Peng Ma and Yun-Long Chi. Design and evaluation of a downconverter based on MicroTCA.4[J]. Chinese Physics C, 2016, 40(7): 077004.  doi: 10.1088/1674-1137/40/7/077004 shu
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Received: 2015-12-07
Revised: 2016-02-23
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Design and evaluation of a downconverter based on MicroTCA.4

    Corresponding author: Nan Gan,

Abstract: Modern low-level RF (LLRF) control systems of particle accelerators are designed to achieve extremely precise field amplitude and phase regulation inside the accelerating cavities. The RF field signal is usually converted to an intermediate frequency (IF) before being sampled by ADC. As the down-conversion is an important procedure of digital signal processing in LLRF system, designing a high performance and broad band downconverter compatible with various accelerators is important. In this paper, the design of a downconverter based on MicroTCA and its performance evaluation on different frequency points are presented. The major design objective of this module is a wider operating frequency range and more flexibility in application.

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