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

2. 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

3. 84 meters of FEL Undulator Installed
25 undulators installed…
8 more to go

4. 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

5. Injector Transverse Projected Emittance <0.5 mm
Time-sliced emittance: 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

6. 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 

7. 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

8. 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

9. 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

10. <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!

11. 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)

12. 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
Down
Down
Down
Down
NEH
FEH
Linac
Injector
Linac/BC2
LTU/Und
FEL/FEE

13. Done

14. 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)

15. 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.