Author: D’Arcy, R.T.P.
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Energy Spread Control in Plasma Wakefield Accelerators  
  • R.T.P. D’Arcy
    DESY, Hamburg, Germany
  In order to apply plasma wakefield accelerators for free electron lasers and/or colliders it is mandatory to reduce the beam energy spread from the many-percent-level down to 0.1% without affecting the beam emittance. Recently such reduction has been observed in particle-driven plasma-wakefield accelerators. The correlated energy spread is reduced by using the interaction of the electron bunch with its wakefields generated in the plasma. This contribution reviews the working principle of such a dechirper and the experimental observations in the different test facilities. A view on future directions and various ideas and concepts is presented.  
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The PolariX TDS: Experimental Verification of a Next-Generation of Transverse Deflection Structure Working in the X-Band Frequency Regime  
  • B. Marchetti, R.W. Aßmann, B. Beutner, F. Christie, B. Conrad, M.K. Czwalinna, R.T.P. D’Arcy, P. Gonzalez-Caminal, M. Hoffmann, M. Hüning, R. Jonas, K. Klose, O. Krebs, S. Lederer, D. Marx, J. Osterhoff, M. Reukauff, J. Rönsch-Schulenburg, H. Schlarb, S. Schreiber, G. Tews, M. Vogt, A. Wagner, S. Wesch, J. Zemella
    DESY, Hamburg, Germany
  • M. Bopp, H.-H. Braun, A. Citterio, P. Craievich, R. Ganter, T. Kleeb, F. Marcellini, M. Pedrozzi, E. Prat, S. Reiche
    PSI, Villigen PSI, Switzerland
  • N. Catalán Lasheras, A. Grudiev, G. McMonagle, W. Wuensch
    CERN, Meyrin, Switzerland
  The PolariX TDS (Polarizable X-Band Transverse Deflection Structure) is an innovative TDS-design operating in the X-band frequency-range invented at CERN*. The design gives full control of the streaking plane, which can be tuned in order to characterize the projections of the beam distribution in arbitrary transverse axes. This novel feature opens new opportunities for complete characterization of the electron beam including also the 3D reconstruction of the charge-density distribution of the bunch**. A collaboration of three research institutes (DESY, CERN and PSI) was formed to realize the prototype structure in view of future in-series production***. This new RF-cavity design requires very high manufacturing precision. The prototype was assembled using the high-precision-tuning-free assembly procedure developed at PSI****. Late 2019 the first PolariX TDS was installed in the FLASHForward beamline at DESY, where the expected performance of the structure has been validated during the first commissioning with electron beam. The experimental results open the path for novel and more extended beam characterization in the direction of multi-dimensional-beam-phase-space reconstruction.
*Grudiev A.,CLIC-Note-1067(2016).
**Marx D. et al.,J.Phys.:Conf. Ser.874 012077(2017).
***Marchetti al.,IPAC 2017, MOPAB044(2017).
****Craievich P. et al.,FEL 2019, WEP036(2019).
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