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17 th HAPL Meeting Washington, DC October 30, 2007 Naval Research Laboratory

NRL M. Wolford M. Myers J. Sethian J. Giuliani Commonwealth Tech F. Hegeler RSI P. Burns SAIC R. Jaynes. Optical System and staging of the Electra KrF laser facility. 17 th HAPL Meeting Washington, DC October 30, 2007 Naval Research Laboratory Plasma Physics Division

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17 th HAPL Meeting Washington, DC October 30, 2007 Naval Research Laboratory

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  1. NRL M. Wolford M. Myers J. Sethian J. Giuliani Commonwealth Tech F. Hegeler RSI P. Burns SAIC R. Jaynes Optical System and staging of the Electra KrF laser facility 17th HAPL Meeting Washington, DC October 30, 2007 Naval Research Laboratory Plasma Physics Division Washington, DC Work supported by DOE/NNSA/DP

  2. Improved Near Field Measurements since last HAPL Meeting Input 0.5 J 10 cm x 10 cm Telescope LPX 305 i BG 28 1 cm x 3 cm Cylindrical lens Pair 3 cm x 3 cm LA Vision Input Output

  3. Single Beam Electra Pre-Amplifier Yield 80% Ar, 0.3% F2

  4. Single Beam Timing Between Laser Input, Laser Output and Electron Beam (10 J) Input Output Voltage 64.8 ns

  5. Single Beam Output Time Dependent Intensity Output 5 4 2 3 6 1 Input

  6. Single Beam Pre-Amplifier Yield Function of Input Timing Cause of Discrepancy

  7. Two Beam Angularly Multiplex Preamplifier Beam 1 ~ 373 mJ Beam 2 ~ 397 mJ PD 2 PD1 Beamsplitter Calorimeter LPX PLCC 6 m Nike Lens Photodiode Combo Cylindrical Optics

  8. 25 J Output of Two Beam Angularly Multiplex Preamplifier Beam 1 Dimensions Beam 2 9.7 cm 9.0 cm 8.1 cm 7.6 cm Calorimeter Data 25 J Laser Output

  9. Electra Laser System Photodiode (PDTarget) Calorimeter Photodiode (PDM) LPX 42 m Main AMP Pre-AMP

  10. 1 2 3 4 5 6 Full Laser System 452 J Single Shot Yield Big Calorimeter 33 x 33 cm2 Calorimeter PDM Nike Calorimeters 18 x 18 cm2 Calorimeters Pdtarget Sum

  11. Full Laser System Laser Yield Depends on Timing Between LPX, Pre Amplifier and Main Amplifier The Difference if one or both beams are amplified in Pre-amplifier Timing Discrepancy Between Amplifiers

  12. 1 2 3 4 5 6 Full Laser System Yield 1.585 kJ in One Second 5 Hz Burst PDM PDTarget Single Pass Double Pass

  13. Why laser Yield is Decreasing with Shot #? Single Pass Double Pass Observation: Larger Percentage Laser Intensity Decrease was observed after one pass than double pass Probable Cause: A declining input laser intensity into the main amplifier

  14. Near Field (7m) Beam ProfileSuggests increase in Phase Aberration is the cause for the drop in laser energy for the Electra Laser System 5 shot Rep-Rate Burst Single Shot Cross Hairs for Scale

  15. Pre-amplifier Needs Recirculator For Rep-Rate Operation 5 shots @ 5 Hz Pre-amp without gas recirculator 500 shots @ 5 Hz Main-amp with gas recirculator

  16. Electra Laser System 2.5 kJ 2 second burst @ 5 Hz All Components 5 Hz operational for longer bursts Again, Low Yield for later shots due to Pre-Amp Phase Aberrations, will be corrected with Recirculator Calorimeter Response

  17. On Going Improvements in Laser System Since Measurements were made • Pre-Amp Recirculator (Design Complete) (For Beam Quality, Consistent Rep-Rate Output) • Improved Coupling from Pre-Amp to Main Amp • Improved timing control, Reduced Jitter (improvement already made) • Increase and Improve Diagnostics for KrF Code Comparison • Strip Cathode for Pre-Amp (Increased Energy Deposition in laser gas by ~25%)

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