| Paper |
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| THPPH007 |
First RF-Measurements at the 3.5-Cell SRF-Photo-Gun Cavity in Rossendorf
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567 |
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- A. Arnold, H. Buettig, D. Janssen, U. Lehnert, P. Michel, K. Moeller, P. Murcek, Ch. Schneider, R. Schurig, F. Staufenbiel, J. Teichert, R. Xiang
FZR, Dresden
- T. Kamps, D. Lipka, F. Marhauser
BESSY GmbH, Berlin
- G. Klemz
DESY Zeuthen, Zeuthen
- W.-D. Lehmann
IfE, Dresden
- A. Matheisen, B. van der Horst
DESY, Hamburg
- J. Stephan
IKST, Drsden
- V. Volkov
BINP SB RAS, Novosibirsk
- I. Will
MBI, Berlin
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At the Forschungszentrum Rossendorf the development and the setup of the 2nd superconducting radio frequency photo electron injector (SRF-Photo-Gun) is nearly finished. One of the main attention was focussed at the treatment of the cavity. Their RF properties were measured at room temperature. The warm tuning was carried out considering pre-stressing and tuning range of both tuners (half cell and full cells). The adjusted field profiles and pass band frequencies of the four fundamental modes met the requirements. An external Q study of the main coupler yielded to an optimal antenna length and showed very good agreement between simulation and measurement. Furthermore the characteristics of the choke filter and both HOM filters were simulated, measured and tuned at the pi-mode frequency. The preparation (etching and rinsing) and the cold test were successfully done at DESY. The poster presents the setup for the measurements as well as a comparison of the simulated and measured results. Submitted as poster to the 2006 FEL conference
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| THPPH009 |
Cryomodule and Tuning System of the Superconducting RF Photo-Injector
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575 |
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- J. Teichert, A. Arnold, H. Buettig, R. Hempel, D. Janssen, U. Lehnert, P. Michel, K. Moeller, P. Murcek, Ch. Schneider, R. Schurig, F. Staufenbiel, R. Xiang
FZR, Dresden
- T. Kamps, D. Lipka
BESSY GmbH, Berlin
- G. Klemz
DESY Zeuthen, Zeuthen
- W.-D. Lehmann
IfE, Dresden
- J. Stephan
IKST, Drsden
- I. Will
MBI, Berlin
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We present the designs and report on the progress in construction and testing of the cryomodule and the tuning system for the SRF gun. The SRF gun project, a collaboration of BESSY, DESY, MBI and FZR, aims at the installation of a high average current CW photo injector at the ELBE linac with a Nb cavity. The cryostat consists of a stainless steel vacuum vessel, a warm magnetic shield, a liquid N cooled thermal shield, and a He tank with two-phase supply tube. A heater pot in the He input port will be used for He level control. The 10 kW power coupler is adopted from ELBE module. A cooling and support system for the NC photo cathode has been developed and tested. It allows the adjustment of the cathode with respect to the cavity from outside. The cryomodule will be connected with the 220 W He refrigerator of ELBE and will operate at 1.8 to 2 K. The static thermal loss is expected to be less than 20 W. Two tuners will be installed for separate tuning of the three TESLA cells and the half-cell. The tuners are dual spindle-lever systems with step motors and low-vibration gears outside the cryostat. Functionality, tuning range and accuracy have been tested in cryogenic environment.
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| THPPH019 |
Investigations of Longitudinal Beam Properties at the Photoinjector Test Facility in Zeuthen
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597 |
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- J. R. Roensch, J. Rossbach
Uni HH, Hamburg
- G. Asova, J. W. Baehr, H.-J. Grabosch, S. Khodyachykh, S. A. Korepanov, M. Krasilnikov, A. Oppelt, B. Petrosyan, S. Riemann, L. Staykov, F. Stephan
DESY Zeuthen, Zeuthen
- D. Lipka, F. Marhauser, R. Richter
BESSY GmbH, Berlin
- A. P. Onuchin
BINP SB RAS, Novosibirsk
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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 at DESY in Hamburg. In 2005 the setup was extended by a booster cavity. In order to measure longitudinal and transverse beam properties in the range between 5 to 40 MeV/c, a viewport after the booster cavity was developed. It contains several radiators. One of them is Silica aerogel used as Cherenkov radiator for the measurement of the longitudinal electron distribution with a streak camera. Design considerations are presented and maybe first measurement results are available. The longitudinal distributions after the booster for different beam parameters are compared to the distributions before the booster.
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| THPPH020 |
Design of the Multipurpose Dispersive Section at PITZ
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601 |
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- S. Khodyachykh, J. W. Baehr, M. Krasilnikov, A. Oppelt, L. Staykov, F. Stephan
DESY Zeuthen, Zeuthen
- T. Garvey
LAL, Orsay
- D. Lipka
BESSY GmbH, Berlin
- J. R. Roensch
Uni HH, Hamburg
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A detailed knowledge of the parameters of a high-brightness electron beam is of major importance for evaluating the performance of a free electron laser using the beam. Therefore, a full characterization of the beam parameters is required during the commissioning of RF photoinjectors. Contributing to this task, at the Photo Injector Test Facility at DESY in Zeuthen (PITZ) a multi-purpose high energy dispersive arm (HEDA1) for electron energies up to 40 MeV is presently under construction. The dispersive section is designed such that it will combine the functionality of 1) an electron spectrometer, 2) a device for characterization of the longitudinal phase space, and 3) a transverse slice emittance measuring system. The HEDA1 consists of a 180° dipole magnet (C-Bend), followed by a slit, a quadrupole magnet, and a screen station with a read-out for the streak camera. Design considerations and the detailed lay out of the high-energy dispersive section will be presented.
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