| Paper |
Title |
Page |
| MOPC030 |
Operation of FLASH at 6.5 nm Wavelength
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133 |
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- S. Schreiber, B. Faatz, K. Honkavaara
DESY, Hamburg
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FLASH, the Free-Electron-Laser at DESY, Germany has been upgraded in 2007. A 6th accelerating module with eight 9-cell superconducting cavities of the TESLA type has been installed. In addition, another module has been replaced and the tuners of a third module have been repaired. In September 2007, a beam energy of 1 GeV has been achieved for the first time, followed by lasing at 6.5 nm shortly after. With this remarkable achievement, the initial design goals of the FEL in terms of beam energy and wavelength have been reached.
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| MOPC072 |
Photocathode Studies at FLASH
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232 |
| |
- S. Lederer, S. Schreiber
DESY, Hamburg
- J. H. Han
Diamond, Oxfordshire
- P. M. Michelato, L. Monaco, C. Pagani, D. Sertore
INFN/LASA, Segrate (MI)
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Since several years, the DESY photoinjectors at FLASH and PITZ use cesium telluride photocathodes. One concern of operating an electron source with these cathodes is the degradation of the quantum efficiency (QE), starting from about 10 % to below 0.5 % during operation. To further understand this behavior the QE is monitored routinely. In this paper recent results from photocathode studies at FLASH are presented.
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| MOPC075 |
Cs2Te Photocathode Robustness Studies
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241 |
| |
- D. Sertore, P. M. Michelato, L. Monaco, C. Pagani
INFN/LASA, Segrate (MI)
- S. Lederer, S. Schreiber
DESY, Hamburg
- F. Stephan
DESY Zeuthen, Zeuthen
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Cs2Te photocathodes are used as laser driven electron sources at FLASH and PITZ. Besides many aspects of their performances, their robustness to gas exposition and the effect of pollutants on photocathode properties, and indirectly on the photoemitted electrons, are a field still rather unexplored. In this article we present the results of controlled exposition of Cs2Te photocathodes to gases typical present in the UHV environment of an RF Gun with respect to spectral response (QE vs. wavelength), and QE uniformity. Moreover, a comparison between polluted cathodes and fresh ones during operation in an RF Gun is presented.
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