| Paper |
Title |
Page |
| TUPPH004 |
Study of Controllable Polarization SASE FEL using a Crossed-planar Undulator
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239 |
| |
- B. Faatz, W. Decking, Y. Li, J. Pflueger, E. Saldin, E. Schneidmiller, M. V. Yurkov
DESY, Hamburg
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Several methods to produce variable polarization have been under discussion for the European XFEL facility. One such method is to utilize a crossed-undulator scheme. In this paper, the polarization of X-ray radiation for longer wavelengths (0.4 nm and longer) of the XFEL is investigated. The degree of polarization and the Stokes parameters are calculated for different configurations. A first attempt at optimization of the configuration for XFEL parameters is presented.
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| TUPPH078 |
Vibration Stability Studies of a Type III+ XFEL/FLASH Superconducting Accelerating Module Operating at 2K
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421 |
| |
- R. Amirikas, A. Bertolini, J. Eschke, B. Faatz, M. Lomperski
DESY, Hamburg
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The European X-ray Free Electron Laser (XFEL) superconducting accelerating modules, containing a string of Niobium (Nb) cavities and a quadrupole, will operate at 2K. In this paper, vibration stability studies of a high gradient XFEL/FLASH type III+ superconducting accelerating module with its quadrupole operating at 2K for the first time and with the latest design of the cryogenic inner layout will be reported. These measurements are possible using geophones which operate at cryogenic temperatures in both horizontal and vertical directions. In addition, investigation of vibration stability in relation with positioning the quadrupole in the center or the middle of the modules will be presented.
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| FRAAU01 |
Status of FLASH
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533 |
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- K. Honkavaara, B. Faatz, S. Schreiber
DESY, Hamburg
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FLASH, the FEL user facility at DESY, is operated with an electron beam energy up to 1 GeV corresponding to a photon wavelength down to 6.5 nm. The shutdown in summer 2007 was followed by a three month commissioning and study period. A new run of FEL experiments started in November 2007. The full year 2008 is dedicated to beam operation: about half of the time is scheduled for FEL users, and the rest for accelerator and FEL physics studies. Here we report the present status of FLASH as a FEL user facility.
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