Design and Beam Test Results of the Reentrant Cavity BPM for the European XFEL

Abstract : The European X-ray Free Electron Laser (E-XFEL) will use reentrant beam position monitors (BPMs) in about one quarter of the superconducting cryomodules. This BPM is composed of a radiofrequency (RF) reentrant cavity with 4 antennas and an RF signal processing electronics. Hybrid couplers, near the cryomodules, generate the analog sum and difference of the raw pickup signals coming from two pairs of opposite RF feedthroughs. The resulting sum (proportional to bunch charge) and difference signals (proportional to the product of position and charge) are then filtered, down-converted by an RF front-end (RFFE), digitized, and digitally processed on an FPGA board. The task of CEA/Saclay was to cover the design, fabrication and beam tests and deliver these reentrant cavity BPMs for the E-XFEL linac in collaboration with DESY and PSI. This paper gives an overview of the reentrant BPM sys-tem with focus on the last version of the RF front end electronics, signal processing, and overall system performance. Measurement results achieved with prototypes installed at the DESY FLASH2 linac and in the E-XFEL injector are presented.
Type de document :
Communication dans un congrès
International Beam Instrumentation Conference, Sep 2016, Barcelona, Spain. pp.TUPG17, 2017, 〈10.18429/JACoW-IBIC2016-TUPG17〉
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https://hal.archives-ouvertes.fr/hal-01669666
Contributeur : Inspire Hep <>
Soumis le : mercredi 20 décembre 2017 - 23:56:00
Dernière modification le : mardi 25 septembre 2018 - 22:36:15

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Claire Simon, Nicoleta Baboi, Raphael Baldinger, Matthieu Baudrier, Boris Keil, et al.. Design and Beam Test Results of the Reentrant Cavity BPM for the European XFEL. International Beam Instrumentation Conference, Sep 2016, Barcelona, Spain. pp.TUPG17, 2017, 〈10.18429/JACoW-IBIC2016-TUPG17〉. 〈hal-01669666〉

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