Author: Vetter, S.
Paper Title Page
MOPGF032 Installation of a Hot-Swappable Spare Injector Laser System for the SLAC Linac Coherent Light Source 163
 
  • S.C. Alverson, G.W. Brown, F.-J. Decker, S. Gilevich, S. Vetter
    SLAC, Menlo Park, California, USA
  
  LCLS is a fa­cil­ity for gen­er­a­tion of very short du­ra­tion, highly in­tense x-ray pulses which re­quires an ex­tremely re­li­able pho­to­cath­ode elec­tron source. In order to main­tain high up-time (>95%) for the ex­per­i­menters, op­er­a­tions rely on a main­te­nance pro­gram for ac­tive laser com­po­nents as well as on built-in re­dun­dancy in case of fail­ure. To ac­com­plish this, a du­pli­cate laser sys­tem was in­stalled, al­low­ing for quick swap be­tween the ac­tive sys­tem and the spare in the event of a mal­func­tion or for planned main­te­nance. As an added bonus, this re­dun­dant sys­tem pro­vides ad­di­tional pos­si­bil­i­ties for sci­ence as both laser sys­tems can also be run to the cath­ode si­mul­ta­ne­ously to cre­ate mul­ti­ple par­ti­cle bunches. Di­ag­nos­tics were put in place to main­tain both spe­cial and tem­po­ral over­lap and allow for the fast switch­ing be­tween sys­tems by op­er­a­tions per­son­nel while still re­main­ing within the safety en­ve­lope. This was done for both the pri­mary UV drive laser as well as the sec­ondary IR "heater" laser. This paper de­scribes the in­stal­la­tion chal­lenges and de­sign ar­chi­tec­ture for this backup laser sys­tem.  
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