• V.V. Paramonov, A. Naboka
  RAS/INR, Moscow
• A. Donat, L. Jachmann, W. Köhler, M. Krasilnikov, J. Meissner, D. Melkumyan, M. Otevrel, B. Petrosyan, J. Schultze, F. Stephan, G. Trowitzsch, R.W. Wenndorff
  DESY Zeuthen, Zeuthen
• K. Flöttmann
  DESY, Hamburg
• D. Richter
  HZB, Berlin

The DESY PITZ booster cavity, based on the Cut Disk Structure (CDS), is completed in construction. The L-band normal conducting cavity is intended to operate with accelerating rate up to 12.5 MV/m and RF pulse length up to 800 mks to increase the electron bunch energy in the PITZ facility at 20 MeV. The cavity was vacuum conditioned to reduce the out-gassing rate for operation in the facility with photo cathodes. The cavity is mounted in the PITZ tunnel and RF conditioning is started. The results of RF tuning before and after cavity brazing, together with first results of conditioning, are presented.

• L.V. Kravchuk, V.V. Paramonov
  RAS/INR, Moscow
• A. Anisimov, M.V. Lalayan, A.Yu. Smirnov, N.P. Sobenin
  MEPhI, Moscow
• D. Churanov, E.V. Ivanov, S.V. Kutsaev, M. Urbant, A.A. Zavadtsev, D.A. Zavadtsev
  Nano, Moscow
• A. Donat, W. Köhler, M. Krasilnikov, J. Meissner, M. Pohl, J. Schultze, F. Stephan, G. Trowitzsch, R.W. Wenndorff
  DESY Zeuthen, Zeuthen
• C. Gerth, M. Hoffmann, M. Hüning
  DESY, Hamburg

Transverse Deflecting Systems are designated for longitudinal beam diagnostics of ultra-short electron bunches in modern FEL projects. At the European XFEL, Transverse Deflecting Systems are foreseen at three locations. A prototype of the TDS in the injector of the European XFEL will be installed at PITZ which is identical in terms of deflecting structure, low-level RF system and powerful RF hardware. This PITZ TDS has the aim to prove the required performance for all TDS subsystems as well as serve as a diagnostics tool for PITZ. Results of the test cells measurements of a S-band travelling wave structure are presented, showing very good agreement with calculated parameters. RF power supply system, including 3 MW klystron and other RF hardware, is described. Solid state 130 kV Marx modulator has been developed for the klystron feeding. 10 kV module of the modulator has been built and tested. The modulator allows for high voltage shutdown within pulse.

• H. Leich, U. Gensch, M. Grimberg, L. Jachmann, W. Köhler, M. Penno, R.W. Wenndorff
  DESY Zeuthen, Zeuthen
• S. Choroba, H.-J. Eckoldt, T. Grevsmühl
  DESY, Hamburg

The European XFEL, an X-ray free electron laser, is planned as an European project with a strong connection to the DESY research center in Hamburg. Construction started in summer 2007 and commissioning will begin in 2014. The LINAC of the XFEL will incorporate 27 RF stations to supply the RF power required by the superconducting cavities. In order to generate this power (10MW at 1.3GHz) HV pulse modulators are required. Each modulator has to supply 12kV pulses at 1.6kA for 1.7ms pulse duration and at 10Hz nominal repetition rate. The repetition rate can be increased to 30Hz keeping the average power of the 10Hz operation. Although experience exists for FLASH with modulators constructed and built by one company two additional companies have been selected and contracted to design and to build additional prototypes of modulators according to the XFEL requirements. A test stand setup has been prepared at DESY, Zeuthen Site, in order to test and to operate these protoypes under similar conditions as at the XFEL. The presentation describes the Modulator Test Facility at DESY (Zeuthen Site) and presents and discusses test results of the modulator prototype from Thomson Multimedia.