Author: Wesemann, M.
Paper Title Page
MOPGF026 Laser Beam Profiling and Further Improvements to the FHI FEL 149
 
  • H. Junkes, W. Schöllkopf, M. Wesemann
    FHI, Berlin, Germany
 
  A mid-in­frared FEL has been es­tab­lished at the Fritz-Haber-In­sti­tut in Berlin. It is used for spec­tro­scopic in­ves­ti­ga­tions of mol­e­cules, clus­ters, nanopar­ti­cles and sur­faces. The os­cil­la­tor FEL is op­er­ated with 15 - 50 MeV elec­trons from a nor­mal-con­duct­ing S-band linac equipped with a grid­ded thermionic gun and a chi­cane for con­trolled bunch com­pres­sion. The EPICS soft­ware frame­work was choosen to build the con­trol sys­tem for this fa­cil­ity. In an ef­fort to sup­port the var­i­ous ex­per­i­menters two dif­fer­ent Laser Beam Pro­fil­ing cam­eras have been in­te­grated. Here, the aread­e­tec­tor frame­work with geni­cam in­te­gra­tion is used. The con­trol sys­tem was also ex­panded with fast dig­i­tiz­ers (SIS3316) but con­nected via Eth­er­net in­stead of using a VME­bus crate con­troller to get a higher flex­i­bil­ity. A iPad app for mon­i­tor­ing com­pletes the en­hance­ment. This paper pre­sents de­sign and im­ple­men­ta­tion as­pects of the up­grade, its ca­pa­bil­i­ties, and lessons learned dur­ing the de­vel­op­ment.  
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