Author: Hartl, I.
Paper Title Page
TUP034 New Ellipsoidal Photocathode Laser Pulses at the Upgraded PITZ Facility 439
  • J.D. Good, P. Boonpornprasert, M. Groß, H. Huck, I.I. Isaev, D.K. Kalantaryan, G. Kourkafas, M. Krasilnikov, D. Melkumyan, A. Oppelt, M. Otevřel, Y. Renier, T. Rublack, F. Stephan, G. Vashchenko
    DESY Zeuthen, Zeuthen, Germany
  • A.V. Andrianov, E. Gacheva, E. Khazanov, S. Mironov, A. Poteomkin, V. Zelenogorsky
    IAP/RAS, Nizhny Novgorod, Russia
  • G. Asova
    INRNE, Sofia, Bulgaria
  • M. A. Bakr
    Assiut University, Assiut, Egypt
  • I. Hartl, S. Schreiber
    DESY, Hamburg, Germany
  • C. Hernandez-Garcia
    JLab, Newport News, Virginia, USA
  • M. Khojoyan
    SOLEIL, Gif-sur-Yvette, France
  • O. Lishilin, G. Pathak
    Uni HH, Hamburg, Germany
  • D. Malyutin
    HZB, Berlin, Germany
  • E. Syresin
    JINR, Dubna, Moscow Region, Russia
  • Q.T. Zhao
    IMP/CAS, Lanzhou, People's Republic of China
  High brightness electron sources for free electron lasers like FLASH and the European XFEL are developed, optimized and characterized at the Photo Injector Test facility at DESY in Zeuthen (PITZ). Last year the facility was significantly upgraded with a new prototype photocathode laser capable of producing homogeneous ellipsoidal pulses. Previous simulations have shown that the corresponding pulses produce high brightness electron bunches with minimized emittance. Furthermore, a new normal conducting RF gun cavity was installed with a modified two-window waveguide RF feed layout for stability and reliability tests, as required for the European XFEL. Other relevant additions to the facility include beamline modifications for improved electron beam transport through the PITZ accelerator, refinement of both the cooling and RF systems for improved parameter stability, and preparations for the installation of a plasma cell. This paper describes the facility upgrades and reports on the operational experience with the new components.  
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WEP030 First Lasing of an HGHG Seeded FEL at FLASH 646
  • K.E. Hacker, S. Khan, R. Molo
    DELTA, Dortmund, Germany
  • S. Ackermann, Ph. Amstutz, A. Azima, M. Drescher, L.L. Lazzarino, C. Lechner, Th. Maltezopoulos, T. Plath, J. Roßbach
    Uni HH, Hamburg, Germany
  • S. Ackermann, R.W. Aßmann, J. Bödewadt, N. Ekanayake, B. Faatz, I. Hartl, R. Ivanov, T. Laarmann, J.M. Müller
    DESY, Hamburg, Germany
  Funding: Supported by Federal Ministry of Education and Research of Germany under contract No. 05K1GU4 and 05K10PE1 and the German Research Foundation program graduate school 1355.
The free-electron laser facility FLASH at DESY operates in SASE mode with MHz bunch trains of high-intensity extreme ultraviolet and soft X-ray FEL pulses. A seeded beamline which is designed to be operated parasitically to the main SASE beamline has been used to test different external FEL seeding methods. First lasing at the 7th harmonic of a 266 nm seed laser using high-gain harmonic generation has been demonstrated. Studies of the influence of the microbunching instability are being pursued.
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