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Betts, M.

Paper Title Page
TUPD097 Laser Technology for Precision Monoenergetic Gamma-ray Source R&D at LLNL 2126
 
  • M. Shverdin, F. Albert, S.G. Anderson, C.P.J. Barty, A.J. Bayramian, M. Betts, T.S. Chu, C.A. Ebbers, D.J. Gibson, F.V. Hartemann, R.A. Marsh, D.P. McNabb, M. J. Messerly, H.H. Phan, M.A. Prantil, C. Siders, S.S.Q. Wu
    LLNL, Livermore, California
  
 

Gen­er­a­tion of mono-en­er­get­ic, high bright­ness gam­ma-rays re­quires state of the art lasers to both pro­duce a low emit­tance elec­tron beam in the linac and high in­ten­si­ty, nar­row linewidth laser pho­tons for scat­ter­ing with the rel­a­tivis­tic elec­trons. Here, we overview the laser sys­tems for the 3rd gen­er­a­tion Mo­noen­er­get­ic Gam­ma-ray Source (MEGa-ray) cur­rent­ly under con­struc­tion at Lawrence Liv­er­more Na­tion­al Lab. We also de­scribe a method for in­creas­ing the efficien­cy of laser Comp­ton scat­ter­ing through laser pulse re­cir­cu­la­tion. The fiber-based pho­toin­jec­tor laser will pro­duce 50 uJ tem­po­ral­ly and spa­tial­ly shaped UV puls­es at 120 Hz to gen­er­ate a low em­mit­tance elec­tron beam in the X-band RF pho­toin­jec­tor. The in­ter­ac­tion laser gen­er­ates high in­ten­si­ty pho­tons that focus into the in­ter­ac­tion re­gion and scat­ter off the ac­cel­er­at­ed elec­trons. This sys­tem uti­lizes chirped pulse am­pli­fi­ca­tion and com­mer­cial diode pumped solid state Nd:YAG am­pli­fiers to pro­duce 0.5 J, 10 ps, 120 Hz puls­es at 1064 nm and up to 0.2 J after fre­quen­cy dou­bling. A sin­gle pas­sive­ly mode-locked Yt­ter­bium fiber os­cil­la­tor seeds both laser sys­tems and pro­vides a tim­ing synch with the linac.