Performance of the monochromator beamline at FLASH

The performance of the high-resolution monochromator at FLASH, the vacuum ultra-violet free-electron laser at DESY in Hamburg, was investigated. Using different techniques we measured the relative and absolute transmission of the monochromator beamline for FLASH radiation in the fundamental and higher (up to third) harmonics. The focal spot size of the soft x-ray beam at the output of the beamline was determined as well. In addition, a new way of acquiring the resolving power of the monochromator is discussed. This method has also been applied to calibrate the energy scale of the monochromator system with an accuracy of 5 meV at 48 eV photon energy.

[1]  P. Nicolosi,et al.  First operation of a free-electron laser generating GW power radiation at 32 nm wavelength , 2006 .

[2]  H. Petersen,et al.  The plane grating and elliptical mirror: A new optical configuration for monochromators , 1982 .

[3]  Wilfried Wurth,et al.  Monochromator beamline for FLASH , 2006 .

[4]  Greene,et al.  High-resolution experimental and theoretical study of singly and doubly excited resonances in ground-state photoionization of neon. , 1996, Physical review. A, Atomic, molecular, and optical physics.

[5]  Statistical properties of the radiation from VUV FEL at DESY operating at 30 nm wavelength in the femtosecond regime , 2005, physics/0511234.

[6]  Franco Cerrina,et al.  SHADOW: A synchrotron radiation ray tracing program , 1986 .

[7]  M. Yurkov,et al.  The Physics of Free Electron Lasers , 1999 .

[8]  J. Feldhaus,et al.  Development of MCP-based photon diagnostics at the TESLA Test Facility at DESY , 2004 .

[9]  J T Costello,et al.  Spectroscopic characterization of vacuum ultraviolet free electron laser pulses. , 2006, Optics letters.

[10]  Ryszard S. Romaniuk,et al.  Operation of a free-electron laser from the extreme ultraviolet to the water window , 2007 .

[11]  L. A. Shmaenok,et al.  Measurement of gigawatt radiation pulses from a vacuum and extreme ultraviolet free-electron laser , 2003 .

[12]  E. Plönjes,et al.  Method based on atomic photoionization for spot-size measurement on focused soft x-ray free-electron laser beams , 2006 .