| Paper |
Title |
Page |
| MOPKF021 |
Properties of Cathodes Used in the Photoinjector RF Gun at the DESY VUV-FEL
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348 |
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- S. Schreiber
DESY, Hamburg
- J.H. Han
DESY Zeuthen, Zeuthen
- P. Michelato, L. Monaco, D. Sertore
INFN/LASA, Segrate (MI)
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The new injector of the DESY VUV-FEL is being commissioned in spring 2004. Several cathodes have been tested in the photoinjector RF Gun. We report on quantum efficiency, dark current, and the overall appearance of the cathodes after their use.
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| MOPKF045 |
Cesium Telluride and Metals Photoelectron Thermal Emittance Measurements Using a Time-of-flight Spectrometer
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408 |
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- D. Sertore, D. Favia, P. Michelato, L. Monaco, P. Pierini
INFN/LASA, Segrate (MI)
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The thermal emittance of photoemitted electrons in an RF gun is a crucial parameter for short wavelength FELs and future high luminosity electron colliders. An estimate of the thermal emittance of semiconductor and metal samples, commonly used as photocathodes, has been assessed using a Time-Of-Flight spectrometer. In this paper we present the analysis, based on angle resolved photoemission measurements, of both the cesium telluride (Cs2Te) photocathode films as used at the TESLA Test Facility, and polycrystalline metals. These latter measurements, at different laser wavelengths, are used to validate both our experimental apparatus and the thermal emittance reconstruction technique developed.
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| MOPKF026 |
Conditioning and High Power Test of the RF Guns at PITZ
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357 |
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- J.H. Han, K. Abrahamyan, J. Bähr, H.-J. Grabosch, M. Krasilnikov, D. Lipka, V. Miltchev, A. Oppelt, B. Petrosyan, D. Pose, L. Staykov, F. Stephan
DESY Zeuthen, Zeuthen
- I. Bohnet, J.-P. Carneiro, K. Floettmann, S. Schreiber
DESY, Hamburg
- M.V. Hartrott, R. Richter
BESSY GmbH, Berlin
- P. Michelato, L. Monaco, D. Sertore
INFN/LASA, Segrate (MI)
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This paper describes the recent results of conditioning and high power tests of the photocathode RF guns at the Photo Injector Test Facility at DESY Zeuthen (PITZ). For successful operation of high gain SASE FELs, high phase space density of the electron beam is required. A high gradient in the gun has to be applied to improve the quality of the space charge dominated beams. In addition, long RF pulses and high repetition rate should be achieved to provide a high average power of FEL radiation. The first PITZ RF gun has been successfully tested at a mean power of 27 kW (900μseconds, 10 Hz, and 3 MW) and has been installed at the VUV-FEL at DESY Hamburg. Another RF gun has been installed at PITZ in January 2004 and is being conditioned for high power tests. The dark current behavior for various cathodes and for all operating schemes is also presented.
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| MOPKF027 |
Optimizing the PITZ Electron Source for the VUV-FEL
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360 |
| |
- M. Krasilnikov, J. Bähr, U. Gensch, H.-J. Grabosch, J.H. Han, D. Lipka, V. Miltchev, A. Oppelt, B. Petrosyan, D. Pose, L. Staykov, F. Stephan
DESY Zeuthen, Zeuthen
- K. Abrahamyan
YerPhI, Yerevan
- W. Ackermann, R. Cee, W.F.O. Müller, S. Setzer, T. Weiland
TEMF, Darmstadt
- G. Asova, G. Dimitrov, I. Tsakov
INRNE, Sofia
- I. Bohnet, J.-P. Carneiro, K. Floettmann, S. Riemann, S. Schreiber
DESY, Hamburg
- M.V. Hartrott, E. Jaeschke, D. Krämer, R. Richter
BESSY GmbH, Berlin
- P. Michelato, L. Monaco, C. Pagani, D. Sertore
INFN/LASA, Segrate (MI)
- J. Rossbach
Uni HH, Hamburg
- W. Sandner, I. Will
MBI, Berlin
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The goal of the Photo Injector Test Facility at DESY Zeuthen (PITZ) is to test and optimize electron sources for Free Electron Lasers and future linear colliders. At the end of 2003 the first stage of PITZ (PITZ1) has been successfully completed, resulting in the installation of the PITZ RF gun at the Vacuum Ultra Violet - Free Electron Laser (VUV-FEL) at DESY Hamburg. The main results achieved during the PITZ1 extensive measurement program are discussed in this paper. A minimum normalized beam emittance of about 1.5 pi mm mrad for 1 nC electron bunch charge has been reached by optimizing numerous photo injector parameters, e.g. longitudinal and transverse profiles of the photocathode laser, RF phase, main and bucking solenoid current. The second stage of PITZ (PITZ2), being a large extension of the facility and its research program, has started now. Recent progress on the PITZ2 developments will be reported as well.
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