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TUPPH067 Commissioning of a New Emittance Measurement System at PITZ emittance, electron, diagnostics, gun 474
 
  • L. Staykov, J. W. Baehr, H.-J. Grabosch, S. Khodyachykh, S. A. Korepanov, M. Krasilnikov, A. Oppelt, B. Petrosyan, J. R. Roensch, F. Stephan
    DESY Zeuthen, Zeuthen
  • G. Asova, I. Tsakov
    INRNE, Sofia
  The goal of the Photo Injector Test facility in Zeuthen (PITZ) is to test and optimize high brightness electron sources suitable for FEL's like FLASH and XFEL. Such sources are characterized by very low emittance at high bunch charge. The Emittance Measurement SYstem (EMSY) described in this paper uses YAG and OTR screens to measure the transverse beam size and thin Tungsten slits to measure the divergence of the beam. It has been optimized to measure emittance for a beam of 1 nC in the energy range 5 - 30 MeV. EMSY was developed in a cooperation between DESY Zeuthen and INRNE Sofia. It was installed in the PITZ tunnel in the beginning of June and commissioning and first measurements were done.  
 
THPPH008 High Peak Current Design of a Superconducting Cavity for a SRF Photoinjector emittance, gun, laser, cathode 571
 
  • D. Janssen
    FZR, Dresden
  • F. Marhauser
    BESSY GmbH, Berlin
  • V. Volkov
    BINP SB RAS, Novosibirsk
  In collaboration between BESSY, DESY, FZR, MBI and BINP a SRF electron gun is under development. The progress obtained in the last year is reported on this conference. The motivation for the design of a new gun cavity is the FEL project at BESSY. The electron injector of the linac should produce bunches with a charge of 2.5 nC and a transverse emittance of 1.5 mm mrad. In order to compensate the emittance expansion by space charge effects a large electric field on the cavity axis and a strong magnetic field near the cathode are necessary. The strengths of these fields are limited by the maximum magnetic surface field in superconducting cavities. We have designed a 1.5 cell gun cavity, where the magnetic field is realized by an additional RF mode (TE mode). In order to reduce third order effects of the RF fields, for the accelerating field a frequency below the linac frequency is used. The laser pulse, which creates the electron bunch, has a length of 20ps and a rise time of 2ps. In the tracking calculation the electrons start with an average energy of 1eV. For a bunch charge of 2.5 nC a transverse emittance of 1.8 mm mrad has been obtained. The maximal surface field is 160 mT.  
 
THPPH019 Investigations of Longitudinal Beam Properties at the Photoinjector Test Facility in Zeuthen electron, gun, photon, dipole 597
 
  • 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
  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.  
 
THPPH020 Design of the Multipurpose Dispersive Section at PITZ quadrupole, emittance, electron, dipole 601
 
  • 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
  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.  
 
THPPH058 Beam Spreading and Emittance Oscillation of an Intense Magnetized Beam in Free Space emittance, space-charge, focusing, electron 721
 
  • C.-X. Wang, K.-J. Kim
    ANL, Argonne, Illinois
  Intense beams with large angular momentum have important applications in electron cooling and in producing flat beams suitable for ultrafast x-ray generation, Smith-Purcell radiators, and possibly for a future linear collider. To gain basic understanding of the influence of beam angular momentum in an otherwise space-charge-dominated beam, the behavior of such a beam in free space will be examined here, in particular, beam spreading due to space-charge force, as well as emittance oscillation. Drift space is an important part of a split photoinjector and plays a significant role in emitance compensation of a high-brightness photoinjector.