• J. Bödewadt, J. Roßbach
  Uni HH, Hamburg
• R. Ischebeck
  PSI, Villigen
• B. Polzin, H. Schlarb, A. Wagner
  DESY, Hamburg

A seeded free-electron laser operating in the soft X-ray (XUV) spectral range will be added to the SASE FEL facility FLASH. The seed beam will be generated by higher harmonics of a near infrared laser system. A dedicated transport system will guide the radiation into the electron accelerator environment. Within the seed undulator section compact diagnostic units have to be designed to control the transverse overlap of the photon and the electron beam. These units contain a BPM a wire scanner and an OTR screen for the electron diagnostic. A Ce:YAG screen and a MCP readout for the wire scanner are foreseen to measure the photon beam position.

• 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