P. Emma, for the LCLS Commissioning Team LCLS DOE Review May 14, 2009

Commissioning Status of LCLS Laser, gun, & injector commissioned: 2007 Linac & bunch compressors commissioned: 2008 First beam through undulator beamline: Dec. 2008 21 undulator magnets installed & ready: April 7, 2009 First lasing at 1.5 Å: April 10, 2009 (first try!) 1.5 Å FEL saturation observed: April 14, 2009 (after BBA) X-ray diagnostics hall is not ready until early June Temporary (makeshift) x-ray diagnostics used up to now User operations start in Sep. 2009

84 meters of FEL Undulator Installed 25 undulators installed… 8 more to go

Undulator Gain Length Measurement at 1.5 Å gex,y = 0.4 mm (slice) Ipk = 3.0 kA sE/E = 0.01% (slice) Recent Results! (25 of 33 undulators installed) LG  3.3 m

Injector Transverse Projected Emittance <0.5 mm Time-sliced emittance: 0.3-0.4 m Exceptional beam quality from S-band Cu-cath. RF gun… 135 MeV 0.25 nC 35 A gex  0.43 mm gey  0.46 mm

Undulator ‘Taper Scan’ Shows 1.1 mJ of X-rays 1.5 Å FEL Energy (YAG) Pixel sum of x-ray YAG screen CCD camera vs undulator K-taper 4.6 MeV 4.6 MeV at 0.25 nC = 1.1 mJ or 0.8×1012 photons/pulse (15 GW at 75-fs FWHM pulse length) FEL-induced Energy Loss (BPMs) Dumpline BPMs Dog-Leg BPMs  ~100 meters 

Laser Heater Working Well YAGS2 Laser OFF σE/E < 12 keV RF deflector ON time energy YAGS2 Laser: 40 µJ σE/E  45 keV Laser Heater Working Well adds Landau damping YAGS2 Laser: 230 µJ σE/E  120 keV

X-translation (in/out) Undulator Girder with Motion Control + IN/OUT Cavity BPM (<0.5 m) Quadrupole magnet 3.4-m undulator Beam Finder Wire (BFW) CAM-based 5-DOF motion control beam direction X-translation (in/out) Wire Position Monitor Hydraulic Level System sand-filled, thermally isolated supports

Beam-Based Undulator Alignment Measure undulator trajectory at 4 energies (4.3, 7.0, 9.2, & 13.6 GeV) Scale all linac & upstream transport line magnets each time Do not change anything in the undulator Calculate… (Matlab GUI) Move quads and adjust BPM offsets for dispersion free trajectory Iterate… H. Loos RESULT: vary energy by factor of 3  trajectory changes by <10 mm

<1 mm Undulator Quadrupole Position Control 3-parameter fit to 20 BPMs along undulator (y0, y0, and Dy) Dy = 30 nrad kick due to quad ±4 mm (y0, y0) 0.7 mm backlash Thanks ANL!

BFW  e- Beam Finder Wire – Aligns ‘Loose’ End of Undulator wire target nominal chamber beam direction pumpout BFW Also used to measure emittance in undulator  e- wire IN wire OUT beam signal (arb. units) sx  40.4 µm x (mm)

Commissioning Time-Line First FEL Light Commissioning Project Milestones Installation Periods Install Undulators Project complete First Light in FEH First e- from gun PEP-II ends First e- to dump FEE/NEH Install First Light in FEE DOE Review X-Rays in NEH LTU/Und Sys Install First Users Injector Install BC2 Install J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A S O N D J F M A M J J A D M D 2007 2008 2009 2010 Down Down Down Down NEH FEH Linac Injector Linac/BC2 LTU/Und FEL/FEE

Done

Questions What are the available high level control programs for setting up, optimizing, and monitoring machine performance? To what level has their performance been validated? (Loos) What is the plan for detailed study and understanding of FEL performance and its sensitivity to the beam brightness, matching, energy and phase errors, LSC, CSR, etc.? (Huang) Is the hardware and software sufficiently reliable and usable to effectively serve the next stage of commissioning? If not, how will this be resolved? (Frisch) What is the plan for transitioning from operation by physicists and other specialists to operation by operators? (Schultz) Describe the configuration control in place or planned for hardware, software, and settings. Do these provide reasonable assurance that operational conditions can be reproduced? (Iverson) How quickly can the machine be brought up to an operational configuration after being tripped or shut down for minor repairs? Is this adequate? If not, how will this be addressed? (Frisch) What aspects of CD-4 performance measures have yet to be achieved and what's the plan for achieving them? (PE) What progress has been made on recommendations from other recent reviews (e.g., the last Lehman review)? (PE)

Borland/Neil Question #4 4. What is the plan for transitioning from operations by physicists and other specialists, to operations by operators? In the fall early science using the AMO instrument will begin. The schedule calls for machine maintenance one shift per week, machine studies 5 shifts per week and operation of a user program for the other 15 shifts. The accelerator physics staff will be limited to the accelerator studies they can do in those 5 shifts and are developing a system for controlling those studies. Accelerator operators are currently assisting the commissioning team and so are already adept at maintaining machine operation. In the LCLS Accelerator Systems Division area physicists, area managers, and safety oversight staff who will be responsible for LCLS operation have been named. Full documentation and training for linac and LCLS operations have been generated and is in use. Configuration control of the LCLS accelerator and safety systems is in force at present and will continue.