THAAU  —  FEL Operation   (30-Aug-07   09:00—10:50)

Chair: P. Michel, FZD, Dresden

Paper Title Page
THAAU01 Experience and Plans of the JLAB FEL Facility as a User Facility 491
 
  • M. D. Shinn
    Jefferson Lab, Newport News, Virginia
  
  Jefferson Lab’s IR Upgrade FEL building was planned from the beginning to be a user facility, and includes an associated 600 sq. m area containing seven laboratories. The high average power capability (multikilowatt-level) in the near-infrared (1-3 microns), and many hundreds of watts at longer wavelengths, along with an ultrafast (~ 1 ps) high PRF (10’s MHz) temporal structure makes this laser a unique source for both applied and basic research. In addition to the FEL, we have a dedicated laboratory capable of delivering high power (many tens of watts) of broadband THz light. After commissioning the IR Upgrade, we once again began delivering beam to users in 2005. In this presentation, I will give an overview of the FEL facility and its current performance, lessons learned over the last two years, and a synopsis of current and future experiments.  
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THAAU02 Operational Experience of FLASH  
 
  • B. Faatz, S. Schreiber
    DESY, Hamburg
  • K. Honkavaara
    Uni HH, Hamburg
  
  Since summer 2005 the free electron laser FLASH at DESY is operating as a user facility. It produces 10 fs long laser like pulses from the vacuum ultraviolet to the soft X-ray wavelength range. Many successful user experiments have been carried out with this world wide unique facility. In this paper we report on operational issues of the facility.  
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THAAU03 Experimental Study of Volume Free Electron Laser Using a "Grid" Photonic Crystal with Variable Period 496
 
  • V. G. Baryshevsky, N. A. Belous, V. A. Evdokimov, A. Gurinovich, A. S. Lobko, A. V. Oskin, P. F. Safronov, P. V. Molchanov
    Belarussian State University, Scientific Research Institute of Nuclear Problems, Minsk
  
  Electrodynamical properties of a crystal-like artificial periodic structure (photonic crystal) formed by a periodically strained metallic threads were studied both theoretically and experimentally*,**. In the present paper operation of Volume Free Electron Laser using a "grid" photonic crystal with variable period is experimentally studied. Dependence of the generation threshold on photonic crystal length is investigated along with the frequency characteristics of generated radiation.

* Baryshevsky V. G. et al. NIM section B. Vol252 (2006) P.92-101 ** Baryshevsky V. G. et al. Proc. of the 28th FEL Conference PP.331-338

 
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THAAU05 Light Pulse Structure, Spectrum and Coherency of Novosibirsk Terahertz Free Electron Laser  
 
  • E. I. Kolobanov, V. V. Kotenkov, G. N. Kulipanov, A. N. Matveenko, L. E. Medvedev, V. K. Ovchar, K. S. Palagin, T. V. Salikova, M. A. Scheglov, S. S. Serednyakov, N. Vinokurov, V. V. Kubarev
    BINP SB RAS, Novosibirsk
  
  Light pulse structure and spectrum of Novosibirsk free electron laser were studied by direct independent methods. Super fast Schottky diode was used in time domain experiments. Method of vacuum Fourier spectroscopy was applied for spectral investigations. Observation of spectral stability of each light pulse was made by grating monochromator with Schottky diode. Influence of cogerency on harmonic powers is also shown.  
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