Bill White Commissioning October 9, 2006 Drive-Laser Commissioning Status and Plans Requirements Where do we stand today? Laser Acceptance Status Laser Commissioning UV on cathode – Injector Commissioning

Bill White Commissioning October 9, 2006 Gun Design for Normal Incidence Layout of Laser from Injection Mirror to Cathode laser injection cross vacuum valve cathode gun solenoid drawing compliments of R.F. Boyce & T. Osier

Bill White Commissioning October 9, 2006 UV pulse goals rise and fall times < 1 ps flat-top, < 8% peak-to peak IR to UV conversion efficiency > 10 %, 2.5 mJ 255 nm nm, < 2% energy stability 120 Hz, MTBF > 5000 hours Spatial Profile FWHM = 1.2 – 3.0 mm Temporal Profile FWHM = 10 ps (5-20 ps)

Bill White Commissioning October 9, 2006 Laser Beam Specifications on the Cathode ParameterNominal SpecTolerance Central Wavelength255nm Pulse Energy>0.4mJ Continuously adjustable <2% RMS variation (shot-to-shot) Spatial Fluence ProfileUniform (adjustable)<20% (peak-to-peak) Spot RadiusAdjustable from 0.6mm to 1.5mm<4% (Shot-to-shot) Centroid Position Stability<10% radius (RMS) Repetition Rate120Hz, 60Hz, 30Hz, 10Hz, 1Hz Temporal Power ProfileUniform (adjustable) Slope adjustable from -10% to +20% <8% peak-to-peak on the plateau Profile FWHM10 psec (adjustable to from 5 to 20 psec) < 2 % RMS (over multiple shots) Profile Rise/Fall time1.0ps (10% to 90%) Timing Jitter< 0.5 psec (shot-to-shot)with respect to the external RF source

Bill White Commissioning October 9, 2006

Bill White Commissioning October 9, 2006 Challenges Temporal Shape UV conversion Spatial Shape 120 Hz Synchronization Reliability Characterization Transport Hardest Not part of Thales contract

Bill White Commissioning October 9, 2006 Spatial Beam Shaping – Newport Shaper Converts Gaussian beam input to flat top output High energy conversion - accepts 99.7% of input energy High profile uniformity - 78% of input power is directed into the flat top with 15% RMS power variation Collimated output beam allows use of conventional optics after beam shaping Provides performance over large wavelength ranges GBS-UV H

Bill White Commissioning October 9, 2006 Testing of the Newport Shaper Image of the aperture after the shaper Input beam Courtesy of John Castro

Bill White Commissioning October 9, 2006 Transport

Bill White Commissioning October 9, 2006 Layout Beam shaper Vacuum cell Zoom Transport tube Table in the tunnel Photocathode Virtual Cathode Steering system Active Steering Stabilization F1=200 F2=120 F3=-150 F4=F5=5000 F6=1500 L1 L2 L3 L4 L5 L6 Waveplate Polarizer Powermeter Camera Shutter

Bill White Commissioning October 9, 2006 Active Steering Stabilization In order to meet centroid position stability requirement (min 60μm) M6 should be stabilized with 35μrad accuracy Sensitivity of the mirror mount 7arcsec – 34 μrad Camera From Virtual Cathode To Photocathode Laser Bay Transport Tube Table in the tunnel Steering Stabilization has been working on test bench M6 M5 M4 M3 M2 C2 C1

Bill White Commissioning October 9, 2006 Beam Profile on the Cathode ZEMAX Modeling Side - 4mm Beam Radius = 1.56mm Bandwidth 3nm

Bill White Commissioning October 9, 2006 Integration High Speed Driver Pockels Cell Laser Pulses 120HZ Beam Dump To Cathode High Voltage Supply Energy Control Laser Trigger (120 Hz) PPS MPS MCC

Bill White Commissioning October 9, 2006 Where are we now? - Recent Milestones July 14 – Laser Tables Installed

Bill White Commissioning October 9, 2006 Where are we now? - Recent Milestones July 21 – Laser Arrives at Sector 20

Bill White Commissioning October 9, 2006 Where are we now? - Recent Milestones July 24 – Complete system on table

Bill White Commissioning October 9, 2006 Where are we now? - Today Laser Work Complete LSS Move laser supplies into rack Setup streak camera Setup cross-correlator Setup UV-FROG Setup spatial diagnostics

Bill White Commissioning October 9, 2006 Where are we now? - Today Streak Camera installed and working

Bill White Commissioning October 9, 2006 Where are we now? - Today Cross-Correlator working

Bill White Commissioning October 9, 2006 Where are we now? - Today TG-FROG working

Bill White Commissioning October 9, 2006 Today Thales working on pulse shape

Bill White Commissioning October 9, 2006 What's Next - Laser Commissioning LSC Review of Final SOP Oct. 10. Thales engineer here for next 2 weeks for temporal shaping Installation of spatial shaping and transport to begin mid-Oct Laser table and LSS in Vault end-Nov. UV in Vault Virtual cathode work requires GTL. UV on cathode two weeks after virtual cathode Laser optimization (temporal profile, stability, etc) will continue until GTL is installed.

Bill White Commissioning October 9, 2006 Vault Layout

Bill White Commissioning October 9, 2006 Vault Layout

Bill White Commissioning October 9, 2006 Layout - Injector Vault M5 L5 M4 L6M3 M2 VC Power Meter Cathode M1 C1 C2

Bill White Commissioning October 9, 2006 End