Injector Drive Laser Update Sasha Gilevich Dave Dowell

Injector Drive Laser Update Sasha Gilevich, Dave Dowell FAC Review, October 12, 2004 • Drive Laser S 20 Facility Overview • Procurement Plan –Request for Proposals –Perspective Vendors • Launch and Conditioning System Design • UV Conversion of Temporally Shaped Pulses • Preliminary Pulse Shaping Results • X-Ray Endstation Laser Specifications • Summary and Conclusions October 12 2004 Facilities Advisory Committee Injector Drive Laser Update Dave Dowell, Sasha Gilevich@slac. stanford. edu

Sector 20 Alcove Laser Bay Drive Laser System Transport Tubes Laser Heater Transport Tube RF Gun Electron Diagnostic Laser Heater UV Launch and Condition. October 12 2004 Facilities Advisory Committee Injector Drive Laser Update Photocathode Gun & Launch System Dave Dowell, Sasha Gilevich@slac. stanford. edu

Layout of Laser Room at S 20 • Space & Utilities for 2 Drive Lasers October 12 2004 Facilities Advisory Committee Injector Drive Laser Update Dave Dowell, 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) Evaluation Committee Selects Vendor & Awards Contract Selected Vendors Present Proposals To Evaluation & Technical Committees October 12 2004 Facilities Advisory Committee Injector Drive Laser Update Submit RFP to Vendors Drive Laser Evaluation Committee Ranks Proposals Dave Dowell, Sasha Gilevich@slac. stanford. edu

UV Pulse Specifications Parameter System Requirement Operating Range/ Comments Pulse repetition rate 120 Hz Operating rates of 1, 10, 30, 60 and 120 Hz Pulse Energy 2. 5 m. J at 255 nm Continuously adjustable from 0. 1 to 2. 5 m. J Central Wavelength 1 255 nm 252 -258 nm Pulse-to-pulse energy jitter 2. 5 m. J at 255 nm (see Fig. 2), Less than 2%(rms) variation Pulse timing jitter 2 <200 fs (rms), for frequencies>0. 1 Hz Temporal pulse shape 3 Uniform, flat top, selected slope on flat-top within 3% of goal, and <8% peak-to-peak over flattop, 1 ps rise and fall at 10% to 90% 10% to +20% slope Pulse length 10 ps (fwhm) 5 to 20 ps 1. Longer wavelength is acceptable, but requires higher energy due to the reduction in cathode QE 2. Measured with respect to the 119 MHz clock – RF signal 3. The temporal pulse shape is nominally flat but the slope of the pulse must be adjustable from -10% (head 10% higher than the tail) to +20% (head 20% lower than the tail). Some adaptive temporal shaping will be required October 12 2004 Facilities Advisory Committee Injector Drive Laser Update Dave Dowell, Sasha Gilevich@slac. stanford. edu

UV Pulse Specifications Parameter System Requirement Operating Range/ Comments Radial shape 4 Uniform, flat top, <10% peak-to-peak variation within flattop plateau for any single pulse) Centroid Position Stability Less than 3% of the beam radius (1/e 2 level) Measured at the laser output plane Pointing Stability Less than 25μrad Measured at the laser output plane MTBF 5, 6 >5000 hours 4. Spatial Pulse shaping is optional. In case no spatial shaping is done, M 2 should be <1. 1 5. Regular maintenance every 1000 hours performed either by the vendor or SLAC/LCLS is permitted. 6. The vendor should provide information on the reliability of their laser system based upon customer experience. October 12 2004 Facilities Advisory Committee Injector Drive Laser Update Dave Dowell, Sasha Gilevich@slac. stanford. edu

Request for Proposal (Details 1) Drive Laser will be a fully purchased and integrated system from the single vendor Optical transport, launch system, and diagnostics to be built by SLAC Integration and Delivery Full Integration and testing at the vendor’s site Installation and check out at SLAC Delivery date approximately one year after the award October 12 2004 Facilities Advisory Committee Injector Drive Laser Update Dave Dowell, Sasha Gilevich@slac. stanford. edu

Request for Proposal (Details 2) Specifications and Technical Approach MOPA system using CPA scheme Oscillator is synchronized to an external RF source Harmonic Generation Pulse Shaping techniques (Temporal and optional Spatial) with adaptive component determined by the vendor Cryogenic cooling of the power amplifier crystal October 12 2004 Facilities Advisory Committee Injector Drive Laser Update Dave Dowell, Sasha Gilevich@slac. stanford. edu

Request for Proposal (Details 3) Other System Requirements IR beam for the Laser Heater Remote operation and monitoring Control system compatible with the rest of the LCLS controls (EPICS) Machine protection features Possibilities for upgrade October 12 2004 Facilities Advisory Committee Injector Drive Laser Update Dave Dowell, Sasha Gilevich@slac. stanford. edu

Request for Proposal (Details 4) Proposal Requirements and Details Development plan for the high risk components Subcontract components are permitted, Integration by the vendor Proposal includes schedule and milestones Includes critical spares list and test schedule Warranties and Service Contracts Preventive Maintenance by the vendor October 12 2004 Facilities Advisory Committee Injector Drive Laser Update Dave Dowell, Sasha Gilevich@slac. stanford. edu

UV Launch System Steering Stabilization Flattener Spatial Shaper Launch Grating Cathode Window Telescope lenses Grating and Trimmer October 12 2004 Facilities Advisory Committee Injector Drive Laser Update Dave Dowell, Sasha Gilevich@slac. stanford. edu

Launch System Layout October 12 2004 Facilities Advisory Committee Injector Drive Laser Update Dave Dowell, Sasha Gilevich@slac. stanford. edu

Spatial Beam Shaping Newport Refractive Beam Shaper Input Beam Two aspheric lenses Output Beam October 12 2004 Facilities Advisory Committee Injector Drive Laser Update Dave Dowell, Sasha Gilevich@slac. stanford. edu

Spatial Profile Flattening of Ultraviolet Laser Pulses with Aspheric Refractive Optics B. F. Murphy, P. R. Bolton, A. Brachmann, J. F. Schmerge The results of using the IBM refractive aspheric beam shaper at the output of the GTF laser (2 psec, 263 nm, 500μJ) 0. 03 0. 02 0. 01 0 Input x 10 0. 02 40 -3 60 80 Output 6 0. 015 4 0. 01 2 0. 005 0 20 40 60 80 100 120 140 October 12 2004 Facilities Advisory Committee Injector Drive Laser Update 0 50 100 Dave Dowell, Sasha Gilevich@slac. stanford. edu 150 200

Imaging of the Spatially Shaped Beam Preliminary Optical Design (ZEMAX) Input of the Beam Shaper Illumination on the Cathode October 12 2004 Facilities Advisory Committee Injector Drive Laser Update Dave Dowell, Sasha Gilevich@slac. stanford. edu

UV Conversion of the Temporally Shaped Pulses Modified SNLO code THG in BBO (0. 2 mm) Input Bandwidth 12 nm E 400 nm=4. 4 m. J E 800 nm=2. 2 m. J provided by Arlee Smith (Sandia National Lab) Output Efficiency 26% 266 nm October 12 2004 Facilities Advisory Committee Injector Drive Laser Update Dave Dowell, Sasha Gilevich@slac. stanford. edu

UV Conversion of the Broadband Temporally Shaped Pulses Modified SNLO code THG in BBO (0. 1 mm) Input Bandwidth 12 nm E 400 nm=4. 4 m. J E 800 nm=2. 2 m. J provided by Arlee Smith (Sandia National Lab) Output Efficiency 15% 266 nm October 12 2004 Facilities Advisory Committee Injector Drive Laser Update Dave Dowell, Sasha Gilevich@slac. stanford. edu

BNL/SLAC/INFN Laser Pulse Shaping Experiment at BNL/DUVFEL October 12 2004 Facilities Advisory Committee Injector Drive Laser Update Dave Dowell, Sasha Gilevich@slac. stanford. edu

Dazzler in DUVFEL Drive Laser Dazzler - Fast. Lite Inc. acousto-optic dispersive filter (P. Tournois et al. ) Te. O 2 crystal acoustic wave (computer programmable) - spectral amplitude - temporal phase Courtesy of Yuzhen Shen, Carlo Vicario, B. Sheehy, XJ Wang October 12 2004 Facilities Advisory Committee Injector Drive Laser Update Dave Dowell, Sasha Gilevich@slac. stanford. edu

DUVFEL Drive Laser Layout with Dazzler Courtesy of B. Sheehy October 12 2004 Facilities Advisory Committee Injector Drive Laser Update Dave Dowell, Sasha Gilevich@slac. stanford. edu

Laser Pulse Shaping Without Amplification Before Stretcher After Stretcher Courtesy of Yuzhen Shen, Carlo Vicario, B. Sheehy, XJ Wang October 12 2004 Facilities Advisory Committee Injector Drive Laser Update Dave Dowell, Sasha Gilevich@slac. stanford. edu

Preliminary Laser Shaping Results Courtesy of Yuzhen Shen, Carlo Vicario, B. Sheehy, XJ Wang October 12 2004 Facilities Advisory Committee Injector Drive Laser Update Dave Dowell, Sasha Gilevich@slac. stanford. edu

Specifications for the X-Ray Endstation Lasers Parameter Nominal Spec Pulse Length 30 fs Wavelength 800 nm Repetition Rate 1 KHz Pulse Energy 1 m. J October 12 2004 Facilities Advisory Committee Injector Drive Laser Update Dave Dowell, Sasha Gilevich@slac. stanford. edu

Summary and Conclusions S 20 drive laser facility requirements defined Title II facility design started Drive Laser (DL) Technical Review Committee created 1 st meeting July 21, 2004 RFP written & procurement process established: DL Technical Review Committee (advises) DL Evaluation Committee (selects) DL effort consists of three elements: Vendor supplies DL including shaping & UV conversion LCLS provides launch & conditioning system LCLS performs shaping & UV conversion R&D with other labs (BNL, LLNL…) Preliminary studies indicate difficulty converting shaped pulses Preliminary Specs for X-Ray Endstation Lasers October 12 2004 Facilities Advisory Committee Injector Drive Laser Update Dave Dowell, Sasha Gilevich@slac. stanford. edu