• E. Adli
  University of Oslo, Oslo
• R. Corsini, S. Döbert, A. Dubrovsky, G. Riddone, D. Schulte, I. Syratchev
  CERN, Geneva
• R.J.M.Y. Ruber, V.G. Ziemann
  Uppsala University, Uppsala
• S. Vilalte
  IN2P3-LAPP, Annecy-le-Vieux

The two-beam acceleration scheme foreseen for CLIC and the associated radio-frequency (RF) components will be tested in the Two-beam Test Stand (TBTS) at CTF3, CERN. Of special interest is the performance of the power extraction structures (PETS) and the acceleration structures as well as the stability of the beams in the respective structures. After the recent completion of the TBTS, the first 12 GHz PETS has been tested with beam. Up to 30MW of RF power was extracted from a 5A electron beam, using so called recirculation of the RF power inside the PETS. The TBTS instrumentation, including inductive beam position monitors, allows precise measurement of beam parameters before and after the PETS as well as RF power and phase. Measurements of transverse kicks, energy loss and RF power with recirculation are discussed and compared with estimations, including first measurements of RF pulse shortening probably due to break down.

• V.G. Ziemann, G. Angelova Hamberg
  Uppsala University, Uppsala
• J. Bödewadt
  Uni HH, Hamburg
• S. Khan
  DELTA, Dortmund
• M. Larsson, P.M. Salén, P. van der Meulen
  FYSIKUM, AlbaNova, Stockholm University, Stockholm
• F. Löhl, E. Saldin, H. Schlarb, E. Schneidmiller, A. Winter, M.V. Yurkov
  DESY, Hamburg
• A. Meseck
  Helmholtz-Zentrum Berlin für Materialien und Energie GmbH, Berlin

We present very promising recent results from the optical replica synthesizer experiment in FLASH where we manipulate ultrashort electron bunches in FLASH with a laser in order to stimulate them to emit a coherent light pulse with the temporal structure of the electron bunches and subsequently analyze the light pulses with laser diagnostic (FROG) methods.

Slides