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Performance of a reentrant cavity beam position monitor

Abstract : The beam-based alignment and feedback systems, essential operations for the future colliders, require high resolution beam position monitors (BPMs). In the framework of the European CARE/SRF program, a reentrant cavity BPM with its associated electronics was developed by the CEA/DSM/Irfu in collaboration with DESY. The design, the fabrication, and the beam test of this monitor are detailed within this paper. This BPM is designed to be inserted in a cryomodule, work at cryogenic temperature in a clean environment. It has achieved a resolution better than 10  μm and has the possibility to perform bunch to bunch measurements for the x-ray free electron laser (X-FEL) and the International Linear Collider (ILC). Its other features are a small size of the rf cavity, a large aperture (78 mm), and an excellent linearity. A first prototype of a reentrant cavity BPM was installed in the free electron laser in Hamburg (FLASH), at Deutsches Elektronen-Synchrotron (DESY) and demonstrated its operation at cryogenic temperature inside a cryomodule. The second, installed, also, in the FLASH linac to be tested with beam, measured a resolution of approximately 4  μm over a dynamic range ±5  mm in single bunch.
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Submitted on : Monday, October 5, 2009 - 11:08:20 AM
Last modification on : Wednesday, September 16, 2020 - 4:07:54 PM

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M. Luong, S. Chel, O. Napoly, J. Novo, D. Roudier, et al.. Performance of a reentrant cavity beam position monitor. Physical Review Special Topics: Accelerators and Beams, American Physical Society, 2008, 11, pp.082802. ⟨10.1103/PhysRevSTAB.11.082802⟩. ⟨in2p3-00421907⟩

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