| Paper |
Title |
Page |
| MOPB009 |
Review of the Production Process of TTF and PITZ Photocathodes
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671 |
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- D. Sertore, P. Michelato, L. Monaco
INFN/LASA, Segrate (MI)
- A. Bonucci
SAES Getters S.p.A., Lainate
- J.H. Han
DESY Zeuthen, Zeuthen
- S. Schreiber
DESY, Hamburg
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In the present article, the production process of the photocathodes for the TESLA Test Facility (TTF) at DESY Hamburg and the Photo Injector Test Facility at DESY-Zeuthen (PITZ) is reviewed in order to highlight key elements for the final photocathode performances. Since the first photocathode production in 1998, we have continuosly collected relevant paramenters of the cathode plugs and deposition process. These data are now critically analized in view of an optimization of the photocathode performances for the next generation of high brilliance sources.
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| WPAP003 |
Emission Mechanisms in a Photocathode RF Gun
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856 |
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- J.H. Han, J.W. Baehr, H.-J. Grabosch, M. Krasilnikov, V. Miltchev, A. Oppelt, B. Petrosyan, S. Riemann, L. Staykov, F. Stephan
DESY Zeuthen, Zeuthen
- K. Floettmann, S. Schreiber
DESY, Hamburg
- M.V. Hartrott
BESSY GmbH, Berlin
- P. Michelato, L. Monaco, D. Sertore
INFN/LASA, Segrate (MI)
- J.R. Roensch
Uni HH, Hamburg
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In photocathode rf guns, emission mechanisms at the photocathode play a crucial role in the overall beam dynamics. A low bunch charge as well as a short Gaussian bunch profile allow us to study the beam dynamics depending on emission phase without space charge force. This paper presents experimental and simulation studies toward detailed understanding of the photo emission and secondary emission processes at the cathode.
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| WPAP004 |
Dark Current and Multipacting in the Photocathode RF Guns at PITZ
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895 |
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- J.H. Han, J.W. Baehr, H.-J. Grabosch, M. Krasilnikov, V. Miltchev, A. Oppelt, B. Petrosyan, S. Riemann, L. Staykov, F. Stephan
DESY Zeuthen, Zeuthen
- K. Floettmann, S. Schreiber
DESY, Hamburg
- M.V. Hartrott
BESSY GmbH, Berlin
- P. Michelato, L. Monaco, D. Sertore
INFN/LASA, Segrate (MI)
- J.R. Roensch
Uni HH, Hamburg
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For photocathode rf guns, the amount of dark current depends on the cavity surface and the photocathodes. Smooth conditioning reduces the amount of dark current. Mechanical damages of the cathodes induce high dark current and chemical pollution changes emission properties of the cathode. Multipacting in the gun cavity changes the surface status of the cathodes and sometimes makes the gun operation impossible due to vacuum interlocks. In this paper, dark current and multipacting features of the rf gun are presented including experimental and simulation studies.
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| WPAP006 |
Recent Developments at PITZ
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1012 |
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- M. Krasilnikov, K. Abrahamyan, G. Asova, J.W. Baehr, G. Dimitrov, U. Gensch, H.-J. Grabosch, J.H. Han, S. Khodyachykh, S. Liu, V. Miltchev, A. Oppelt, B. Petrosyan, S. Riemann, L. Staykov, F. Stephan
DESY Zeuthen, Zeuthen
- W. Ackermann, W.F.O. Müller, S. Schnepp, T. Weiland
TEMF, Darmstadt
- J.-P. Carneiro, K. Floettmann, S. Schreiber
DESY, Hamburg
- M.V. Hartrott, E. Jaeschke, D. Kraemer, D. Lipka, R. Richter
BESSY GmbH, Berlin
- P. Michelato, L. Monaco, C. Pagani, D. Sertore
INFN/LASA, Segrate (MI)
- J.R. Roensch, J. Rossbach
Uni HH, Hamburg
- W. Sandner, I. Will
MBI, Berlin
- I. Tsakov
INRNE, Sofia
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The ability to produce high brightness electron beams as required for modern Free Electron Lasers (FELs) has been demonstrated during the first stage of the Photo Injector Test Facility at DESY Zeuthen (PITZ1). The electron source optimization at PITZ1 was successfully completed, resulting in the installation of the PITZ rf gun at the VUV-FEL (DESY, Hamburg). One of the main goals of the second stage of PITZ (PITZ2) is to apply higher gradients in the rf gun cavity in order to obtain smaller beam emittance by faster acceleration of the space charge dominated beams. In order to reach the required gradients a 10 MW klystron has to be installed and the gun cavity has to be conditioned for higher peak power. Another important goal of PITZ2 is a detailed study of the emittance conservation principle by using proper electron beam acceleration with a booster. Further photo injector optimization, including update of the photocathode laser and diagnostic tools, is foreseen as well. Recent progress on the PITZ developments will be reported.
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| FOAA005 |
Mechanical Vibration Measurements on TTF Cryomodules
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434 |
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- A. Bosotti, C. Pagani, R. Paparella, P. Pierini, D. Sertore
INFN/LASA, Segrate (MI)
- R. De Monte, M. Ferianis
ELETTRA, Basovizza, Trieste
- R. Lange
DESY, Hamburg
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Few of the TTF cryomodules have been equipped with Wire Position Monitors (WPM) for the on line monitoring of cold mass movements during cool-down, warm-up and operation. Each sensor can be used as a detector for mechanical vibrations of the cryostat. A Digital Receiver board is used to sample and analyze with high frequency resolution, the WPM picked up signals, looking to its amplitude modulation in the microphonic frequency range. Here we review and analyze the data and the vibration spectra taken during operation of the TTF cryomodules # 4 and #5.
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