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Willner, A.

Paper Title Page
TUPE007 High Repetition Rate Seeding of a Free-Electron Laser at DESY Hamburg 2158
 
  • A. Willner, S. Düsterer, B. Faatz, J. Feldhaus, H. Schlarb, S. Schreiber, F. Tavella
    DESY, Hamburg
  • S. Hädrich, J. Limpert, J. Rothhardt, E. Seise, A. Tünnermann
    Friedrich Schiller Universität, Jena
  • J. Roßbach
    Uni HH, Hamburg
  
 

The per­for­mance of fourth gen­er­a­tion light sources is of in­ter­est in many fields in na­ture sci­ence. Dif­fer­ent seed­ing schemes for FELs are under in­ves­ti­ga­tion to im­prove tim­ing sta­bil­i­ty, pulse shape and spec­trum of the am­pli­fied XUV or X-ray puls­es. One of the most promis­ing schemes is di­rect seed­ing by high-har­mon­ic gen­er­a­tion (HHG) in gas. A seed­ed free elec­tron laser with a tune­able wave­length range from 10 to 40nm and a bunch fre­quen­cy of up to 100 kHz (1 MHz up­grad­ed), as pro­posed for FLASH II (col­lab­o­ra­tion HZB/DESY), makes high de­mands on the HHG seed source con­cern­ing con­ver­sion ef­fi­cien­cy and sta­bil­i­ty. How­ev­er, the most chal­leng­ing task is the con­cep­tion of a laser sys­tem with a rep­e­ti­tion rate of 100 kHz (1 MHz up­grad­ed). The key pa­ram­e­ters for this laser am­pli­fi­er sys­tem are pulse en­er­gies of 1-2mJ and sub-10fs pulse du­ra­tion. We re­port on the de­vel­op­ment sta­tus of the re­quired laser sys­tem for the seed source and give an overview of first con­cepts for the HHG tar­get setup which can com­ply with the re­quire­ments of a new seed­ed FEL at DESY.