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Tratnik, J.

Paper Title Page
WEPEB080 Femtosecond Electro-Optical Synchronization System with Long-Term Phase Stability Results 2881
 
  • J. Tratnik, B. Batagelj, L. Pavlovič, M. Vidmar
    University of Ljubljana, Faculty of Electrical Engineering, Ljubljana
  • P.L. Lemut, V. Poucki
    I-Tech, Solkan
  
 

The new gen­er­a­tion of ac­cel­er­a­tors re­quires tim­ing dis­tri­bu­tion and RF syn­chro­niza­tion with fem­tosec­ond pre­ci­sion in terms of jit­ter and long-term sta­bil­i­ty. The pro­posed elec­tro-op­ti­cal syn­chro­niza­tion sys­tem makes use of com­mer­cial tele­com sin­gle-mode op­ti­cal fibre op­er­at­ing at 1550 nm.. It op­er­ates on over 300 m dis­tance. It con­sists of a trans­mit­ter, lo­cat­ed near a low-jit­ter mas­ter os­cil­la­tor, and re­ceiv­er, lo­cat­ed at the re­mote lo­ca­tion. The field ex­per­i­ments have been done in the ac­cel­er­a­tor en­vi­ron­ment with the fibre pair in the tun­nel. The pro­to­type units were in­stalled at the same lo­ca­tion to make phase dif­fer­ence mea­sure­ment sim­ple. Tem­per­a­ture in var­i­ous in­stal­la­tion points, phase dif­fer­ence and both units in­ter­nal op­er­a­tional pa­ram­e­ters were con­tin­u­ous­ly mon­i­tored and stored. Data was post-anal­ysed and con­clu­sions were used for hard­ware changes and most­ly the long-term sta­bil­i­ty im­prove­ment. A ded­i­cat­ed phase de­tec­tor was de­signed to mon­i­tor less than 20 fs changes. Re­sults are show­ing 80 fs RMS and 30 fs sta­bil­i­ty over 20 and 8 hours re­spec­tive­ly. The pro­to­type is being re­designed for man­u­fac­tur­ing with some new fea­tures for im­proved long-term sta­bil­i­ty.