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Title |
Page |
| TUPB13 |
Design Considerations of a Spectrometer Dipole Magnet for the Photo Injector Test facility at DESY in Zeuthen (PITZ)
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87 |
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- J. Rönsch, J. Rossbach
Uni HH, Hamburg
- J. W. Bähr, S. Khodyachykh, S. A. Korepanov, M. Krasilnikov, S. Rimjaem, L. Staykov, F. Stephan
DESY Zeuthen, Zeuthen
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The goal of the Photoinjector Test Facility at DESY in Zeuthen (PITZ) is to test and optimise electron guns for FELs like FLASH and XFEL at DESY in Hamburg and study emittance conservation by using a matched booster cavity. The physical specifications of a second spectrometer for measurements after the booster cavity at the beam momentum range from 4 to 40 MeV/c will be described. It will be used for measurements of the momentum distribution and the longitudinal phase space using two methods. The first method combines the dipole magnet with a RF transverse deflecting cavity, the second combines it with a Cherenkov radiator whose light is measured by a streak camera. Especially the first method is aiming for a good resolution in order to determine slice momentum spread. The design has to meet the demands of all these techniques for a measurement with high resolution and a bunch train containing 7200 pulses of 1nC charge and a repetition rate of 10Hz. Since there is not enough space for a separate beam dump after the dispersive section the beam has to be transported to the dump of the main beamline.
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| TUPB32 |
An RF Deflector for the Longitudinal and Transverse Beam Phase Space Analysis at PITZ
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144 |
| |
- S. A. Korepanov, M. Krasilnikov, F. Stephan
DESY Zeuthen, Zeuthen
- D. Alesini
INFN/LNF, Frascati (Roma)
- L. Ficcadenti
Rome University La Sapienza, Roma
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A detailed characterization of the longitudinal and transverse phase space of the electron beam provided by the Photo Injector Test Facility at DESY in Zeuthen (PITZ) is required to optimize photo injectors for Free-Electron Laser (FEL) applications. By means of a RF deflector the transverse slice emittance and the longitudinal phase space can be analysed. In this paper we present the status of the RF deflector design. The analysis of the prospect diagnostics shows the possibility to achieve a time resolution of about 0.5 ps, and a longitudinal momentum resolution of 10-4. The influence of the deflector on the beam longitudinal and transverse phase space is analysed.
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| TUPC02 |
Photo Injector Cathode Laser Beam Intensity and Pointing Position Diagnostics at PITZ
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147 |
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- Ye. Ivanisenko, G. Asova, J. W. Bähr, S. A. Korepanov, M. Krasilnikov, B. Petrosyan, F. Stephan
DESY Zeuthen, Zeuthen
- O. Kalekin
Erlangen University, Erlangen
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A photo cathode laser with unique parameters is used at the Photo Injector Test facility at DESY in Zeuthen, PITZ. It is cabable of producing laser pulse trains consisting of up to 800 pulses with a repetition rate of 1 MHz where each laser pulse has a flat-top temporal profile. The knowledge of the laser stability is very important for the emittance measurements procedure. Therefore, a system for monitoring the laser beam intensity and pointing position stability was created at PITZ. It is capable of measuring the laser spot position and pulse intensity for each of the laser pulses in the train using a quadrant diode and a photomultiplier tube, respectively. Taking into account the laser beam spot transverse intensity distribution measured by a CCD camera allows to study the position of the laser spot on the photo cathode with a resolution of 8.3 um. Laser intensity measurements can be done for a wide dynamical range of intensities due to the tunable photo multiplier tube gain. The first experiments with the new system show very small laser spot position jitter on the cathode surface of about 20 um and laser intensity fluctuations of about 14 %.
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