Injector Drive Laser Update Facilities Advisory Committee Meeting

Injector Drive Laser Update Facilities Advisory Committee Meeting April 7, 2005 • Project Status • Drive Laser Procurement • R&D • Launch System Design April 7 2005 Facilities Advisory Committee Injector Drive Laser Update Sasha Gilevich@slac. stanford. edu

Project Status Design of the S 20 drive laser facility is underway. Bids are due from general contractors on April 14 th The vendor for the Drive Laser is selected. Purchasing is working on the award of the contract. Basic design of the transport tubes done; drawings submitted for the quote. Shielding should be approved by radiation physics. Design of the Launch and Conditioning System is near completion R&D effort is defined and started. BCR is approved LCLS performs shaping & UV conversion R&D with other labs (LLNL, ANL) BNL temporal shaping work with Dazzler completed April 7 2005 Facilities Advisory Committee Injector Drive Laser Update Sasha Gilevich@slac. stanford. edu

Drive Laser Procurement Process Write Request for Information (RFI) Drive Laser Technical Review July 21, 2004 Evaluate RFI & Technical Review Responses Write Request for Proposal (RFP) Write & Approve Advance Procurement Plan (APP) SLAC Awards Contract Evaluation Committee Selects Vendor Site Visit April 7 2005 Facilities Advisory Committee Injector Drive Laser Update Submit RFP to Vendors Evaluation Committee Ranks the Proposals Evaluation & Technical Committees Review the Proposals Sasha Gilevich@slac. stanford. edu

Drive Laser Procurement Responding to the RFP 5 Companies submitted the proposals Toptica Photonics April 7 2005 Facilities Advisory Committee Injector Drive Laser Update Sasha Gilevich@slac. stanford. edu

Drive Laser Proposals Only Thales signed to meet all the specs Thales sold high energy IR system with the Dazzler KM Labs and Femtolasers manufacture oscillators Thales and Coherent manufacture DPSS pump lasers KM labs proposed 1 KHz system Cryo cooling of the final amplifier (Coherent, KM labs, Amplitude) Nobody has experience with UV temporal shaping and can guarantee meeting UV temporal shaping specs Amplitude and KM Labs proposed R&D plan for UV temporal shaping Temporal shaping. KM Labs proposed passive optical filtering with LCD modulator, the others - Dazzler Only Amplitude suggested diagnostics development Thales and Coherent controls require minimum SLAC integration work April 7 2005 Facilities Advisory Committee Injector Drive Laser Update Sasha Gilevich@slac. stanford. edu

Drive Laser Vendor Selection Thales Strengths High potential output IR energy (80 m. J system at ALLS) Manufacturer of the QCW DPSS pump laser (Jedi) Used Dazzler in several systems (but not for shaping) (ALLS). Proposed configuration can be upgraded to higher energy (up to 50 m. J) by adding second Jedi pump. Cryo cooling is not needed, but can be added Aberration-free stretcher (patented). Motorized Provides programmable, multi-channel pulse synchronization unit. Short delivery time (8 months) Thales is a part of a very large French defense contractor Controls system is compatible with LCLS requirements April 7 2005 Facilities Advisory Committee Injector Drive Laser Update Sasha Gilevich@slac. stanford. edu

Drive Laser Vendor Selection Thales Weaknesses UV shaping part is not developed Possible reliability issues with QCW pump lasers (relatively new product) Warranty on the diodes is for 1 -year or 1 -billion pulses. Warranty on optics is 3 months No details on special diagnostics – (SLAC streak camera) Non-US company Distant location April 7 2005 Facilities Advisory Committee Injector Drive Laser Update Sasha Gilevich@slac. stanford. edu

Open Issues Choice of oscillator. (Femtolasers Femtosource Synergy or the oscillator from KM labs) Controls interface Option to use cryo cooling April 7 2005 Facilities Advisory Committee Injector Drive Laser Update Sasha Gilevich@slac. stanford. edu

Risk Mitigation Buy additional pump laser Conduct UV shaping R&D (LLNL) Develop special diagnostics (LLNL) April 7 2005 Facilities Advisory Committee Injector Drive Laser Update Sasha Gilevich@slac. stanford. edu

Laser Beam Shaping Work at LLNL (March – December 2005) Continue the Dazzler shaping studies to improve the quality and reliability of the UV pulse and to explore other shape types Design a third-harmonic, non-linear optical system with more than 10% IR to UV conversion efficiency which uniformly converts over a 10 nm bandwidth. Modeling Integrated model including temporal shaping and UV conversion. Optimize UV conversion efficiency Investigate designs which integrate shaping and conversion. In particular, the approach converting to UV with a short pulse and then stretching in the UV to the desired length Experiments IR and blue shaping Test and optimization of the UV conversion. UV shaping April 7 2005 Facilities Advisory Committee Injector Drive Laser Update Sasha Gilevich@slac. stanford. edu

Laser Diagnostics Effort at LLNL (March – September 2005) Design, build and test diagnostic systems capable of measuring the IR, blue and UV wavelength-phase correlation (waveform) of the laser beam with better than 100 fs and 0. 1 nm resolution. These diagnostics need to make these measurements for pulses as long as 20 ps and should be single-shot. April 7 2005 Facilities Advisory Committee Injector Drive Laser Update Sasha Gilevich@slac. stanford. edu

LLNL Work - Summary Perform R&D on techniques to produce temporally shaped UV pulses suitable for use in the LCLS injector. Design, build and test laser diagnostics. Test cathode launch optics with shaped pulses. Provide (advise on) the beam steering stabilization system, which was developed by LLNL. Support in the Drive Laser integration. Participate in the technical reviews of vendor’s work. Support integration of shaping into the drive laser April 7 2005 Facilities Advisory Committee Injector Drive Laser Update Sasha Gilevich@slac. stanford. edu

ANL Work UV Conversion and Spatial Shaping Obtain reference data for conversion efficiency of second and third harmonic of IR laser light from a broadband Ti. S laser source Compare these results to modeling predictions from the SNLO code Assess the effects of shaping the incident IR transverse profile on the conversion efficiency and transverse profile of the third harmonic (UV) Assess relay imaging of third harmonic light with a transversely shaped (non-Gaussian) profile over an extended transport distance and compare to modeling predictions from the ZEMAX code Evaluate the performance of a reflective UV diffraction grating with respect to diffraction efficiency, anamorphic profile shaping and tilted amplitude front generation (time slew) and the UV fluence threshold for surface damage April 7 2005 Facilities Advisory Committee Injector Drive Laser Update Sasha Gilevich@slac. stanford. edu

Launch and Conditioning System Requirements Grazing incidence at the photocathode (22. 5 degrees). Requires time slew compensation Uniform spatial shape. Continuous adjustment of the beam diameter on the photocathode from 0. 38 to 2 mm (remotely) Option to steer the beam on the cathode (remotely) April 7 2005 Facilities Advisory Committee Injector Drive Laser Update Sasha Gilevich@slac. stanford. edu

Launch System Layout Aspheric Refractive Beam Reshaper Diffraction grating for time slew correction Aperture for producing the hard edge Two lenses imaging the aperture to the cathode Adjustable distance between lenses for beam diameter control Insertable telescope to change the diameter adjustment range (needed because of limited table space) 2 mirrors with variable angle on translation stages for beam steering Beam splitter for diagnostics (virtual cathode concept) April 7 2005 Facilities Advisory Committee Injector Drive Laser Update Sasha Gilevich@slac. stanford. edu

Layout April 7 2005 Facilities Advisory Committee Injector Drive Laser Update Sasha Gilevich@slac. stanford. edu

Beam Profile (ZEMAX modeling. Bandwidth 3 nm) Minimum spacing between lenses Y X Side – 10 mm April 7 2005 Facilities Advisory Committee Injector Drive Laser Update Sasha Gilevich@slac. stanford. edu

Beam Profile (ZEMAX modeling. Bandwidth 3 nm) Maximum spacing between lenses Y X Side – 5 mm April 7 2005 Facilities Advisory Committee Injector Drive Laser Update Sasha Gilevich@slac. stanford. edu

Beam Profile with the 3: 1 Telescope Minimum spacing between lenses Y Y XX Side – 5 mm April 7 2005 Facilities Advisory Committee Injector Drive Laser Update Sasha Gilevich@slac. stanford. edu

Beam Profile with the 3: 1 Telescope Maximum spacing between lenses YY XX Side – 2 mm April 7 2005 Facilities Advisory Committee Injector Drive Laser Update Sasha Gilevich@slac. stanford. edu

Summary Drive Laser vendor is selected R&D work is needed to solve shaping and UV conversion issues Schedule and budget for LLNL and ANL effort put together BCR is approved Work started Launch System Optical design is completed Design allows to meet the required specifications April 7 2005 Facilities Advisory Committee Injector Drive Laser Update Sasha Gilevich@slac. stanford. edu