CERN Accelerating science

Article
Title	Beam-based commissioning of a novel X-band transverse deflection structure with variable polarization
Author(s)	González Caminal, P (DESY) ; Christie, F (DESY) ; D'Arcy, R (DESY) ; Jaster-Merz, S M (DESY) ; Assmann, R (DESY) ; Burkart, F (DESY) ; Conrad, B (DESY) ; Dinter, H (DESY) ; Foese, M (DESY) ; Herrmann, J (DESY) ; Hoffmann, M (DESY) ; Hüning, M (DESY) ; Jonas, R (DESY) ; Krebs, O (DESY) ; Lederer, S (DESY) ; Marchetti, B (DESY) ; Marx, D (DESY) ; Mueller, J (DESY) ; Osterhoff, J (DESY) ; Peperkorn, I (DESY) ; Reukauff, M (DESY) ; Schlarb, H (DESY) ; Schreiber, S (DESY) ; Tews, G (DESY) ; Vinatier, T (DESY) ; Vogt, M (DESY) ; de Z Wagner, A (DESY) ; Wesch, S (DESY) ; Craievich, P (PSI, Villigen) ; Bopp, M (PSI, Villigen) ; Braun, H -H (PSI, Villigen) ; Citterio, A (PSI, Villigen) ; Fortunati, R (PSI, Villigen) ; Ganter, R (PSI, Villigen) ; Kleeb, T (PSI, Villigen) ; Marcellini, F (PSI, Villigen) ; Pedrozzi, M (PSI, Villigen) ; Prat, E (PSI, Villigen) ; Reiche, S (PSI, Villigen) ; Rolli, K (PSI, Villigen) ; Sieber, R (PSI, Villigen) ; Grudiev, A (CERN) ; Millar, W L (CERN) ; Catalan-Lasheras, N (CERN) ; McMonagle, G (CERN) ; Pitman, S (CERN) ; del Pozo Romano, V (CERN) ; Szypula, K T (CERN) ; Wuensch, W (CERN)
Publication	2024
Number of pages	19
In:	Phys. Rev. Accel. Beams 27 (2024) 032801
DOI	10.1103/PhysRevAccelBeams.27.032801 (publication)
Subject category	Accelerators and Storage Rings
Abstract	Longitudinal electron-beam diagnostics play a critical role in the operation and control of x-ray free-electron lasers, which rely on parameters such as the current profile, the longitudinal phase space, or the slice emittance of the particle distribution. On the one hand, the femtosecond-scale electron bunches produced at these facilities impose stringent requirements on the resolution achievable with the diagnostics. On the other, research and development of novel accelerator technologies such as beam-driven plasma-wakefield accelerators (PWFA) demand unprecedented capabilities to resolve the centroid offsets in the full transverse plane along the longitudinal bunch coordinate. We present the beam-based commissioning of an advanced X-band transverse-deflection rf structure (TDS) system with the new feature of providing variable polarization of the deflecting force: the PolariX-TDS. By means of a comprehensive campaign of measurements conducted with the prototype, key parameters of the rf performance of the system are validated and a phase-space characterization of an electron bunch is accomplished with a time resolution of 3.3 fs. Furthermore, an analysis of second-order effects induced on the bunch from its passage through the PolariX-TDS is presented.
Copyright/License	publication: © 2024 authors (License: CC BY 4.0)

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