| Paper |
Title |
Page |
| MOPC004 |
First Results from the Upgraded PITZ Facility
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70 |
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- J. W. Baehr, S. Lederer
DESY, Hamburg
- G. Asova
INRNE, Sofia
- C. H. Boulware, H.-J. Grabosch, M. Hänel, Ye. Ivanisenko, S. Khodyachykh, S. A. Korepanov, M. Krasilnikov, B. Petrosyan, S. Rimjaem, T. A. Scholz, R. Spesyvtsev, L. Staykov, F. Stephan
DESY Zeuthen, Zeuthen
- L. Hakobyan
YerPhI, Yerevan
- R. Richter
BESSY GmbH, Berlin
- J. Roensch
Uni HH, Hamburg
- K. Rosbach
Humboldt University Berlin, Institut für Physik, Berlin
- A. Shapovalov
MEPhI, Moscow
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During autumn and winter 2007 a general reconstruction of the PITZ facility was performed. A new spectrometer based on a dipole magnet with 180 degree deflection angle was inserted in the facility. The new spectrometer contains two screen stations for the measuring of the longitudinal phase space and the slice emittance. A new "Conditioning Test Stand" (CTS) was added to the facility. Using this CTS a new electron gun having an improved cooling system is under conditioning. A new photocathode laser system (developed by MBI) was installed and commissioned. The goal is to reach rise and fall times of the laser pulses of 2 ps. The system of laser diagnostic was upgraded. The results reached using this upgraded facility are reported. This concerns the conditioning results of the new gun. Furthermore, a gun will be characterised using the new diagnostics beamline and the new photocathode laser. Results of the commissioning and first measurements of the new diagnostics components will be reported.
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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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| MOPC078 |
Tuning and Conditioning of a New High Gradient Gun Cavity at PITZ
|
244 |
| |
- S. Rimjaem, G. Asova, J. W. Baehr, C. H. Boulware, H.-J. Grabosch, M. Hänel, Ye. Ivanisenko, M. Krasilnikov, S. Lederer, A. Oppelt, B. Petrosyan, T. A. Scholz, A. Shapovalov, R. Spesyvtsev, L. Staykov, F. Stephan
DESY Zeuthen, Zeuthen
- K. Floettmann, D. Reschke
DESY, Hamburg
- L. Hakobyan
YerPhI, Yerevan
- R. Richter
BESSY GmbH, Berlin
- J. Roensch
Uni HH, Hamburg
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A new 1.3 GHz photo cathode electron gun (prototype 4.2) for the Photo Injector Test facility in Zeuthen (PITZ) was tuned in February 2007. The main difference in the mechanical design compared to earlier guns is a significantly improved cooling system. This gun is also the first copper gun cavity where a particle free cleaning using dry ice technique was applied while in the previous guns the high pressure ultra pure water rinsing technique was used. The cavity has been installed in a new Conditioning Test Stand (CTS) at PITZ in autumn 2007. It has been conditioned to an accelerating gradient of 60 MV/m and more. Dark current measurements have been performed to monitor the improvement of conditioning and to compare with the results from the previous guns. In this paper, RF measurement and tuning results as well as results of the conditioning and dark current measurements will be presented and discussed.
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