• 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.

• R. Ischebeck, B. Beutner, V. Schlott, B. Steffen
  PSI, Villigen

A screen monitor containing OTR foils and scintillator crystals has been designed to measure the transverse profile of electron bunches in the PSI-XFEL. In conjunction with quadrupole magnets in FODO cells and a transverse deflecting structure, the screen monitors will be used to measure transverse and longitudinal phase space projections of the electron pulses in the 250 MeV Injector. Tomographic methods will be used to reconstruct the phase space distributions.

• Y. Kim, B. Beutner, H.-H. Braun, A. Citterio, M. M. Dehler, A. Falone, R. Ganter, T. Garvey, S. Hunziker, R. Ischebeck, B. Keil, M. Pedrozzi, S. Reiche, T. Schilcher, V. Schlott, B. Steffen
  PSI, Villigen

In this paper, we describe four very different operating modes of the SwissFEL facility, the requirements of the challenging beam diagnostics and ultra-stable RF systems needed for two special operating modes with 10 pC, and the present status of developing beam diagnostics and RF systems for the PSI 250 MeV injector test facility, which is under construction.

Slides