1. Linac Coherent Light Source Update John N
Linac Coherent Light Source Update John N. Galayda, Stanford Linear Accelerator Center 5 November 2002
Overview
Project Status
LCLS user workshop
Collaboration with TESLA
Project R&D
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

2. Overview The world’s first hard x-ray laser
Unprecedented brightness, Unprecedented time resolution
0.8 – 8 keV SASE Free Electron Laser
Electron beam 4.5 – GeV, from SLAC Linac
Peak power in SASE bandwidth 8 GW
Peak brightness 1033 photons/(mm2 mr2 0.1%BW)
Pulse duration  230 femtoseconds
Pulse repetition rate 120 Hz
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

3. LCLS Operating Ranges BESAC Meeting 5 November 2002
John N. Galayda, SLAC

4. Linac Coherent Light Source
1992: Proposal (C. Pellegrini)
1998: Preliminary Design Study Completed
1999: R&D funded at $1.5M/year
2001: CD-0
2002: Conceptual Design
2003: Project Engineering Design begins
2005: Long-Lead Procurements begin
2006: Construction begins
2007: First Light
2008: Project completion
FFTB Tunnel
SLAC Linac
Undulator Hall
Two Chicanes for bunch compression
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

5. Conventional Construction
Final Focus Test Beam Extension
Hall A
Tunnel
Hall B
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

6. Estimated Cost, Schedule
$200M-$240M Total Estimated Cost range
$245M-$295M Total Project Cost range
Schedule:
FY2003 Authorization to begin engineering design
Emphasis on injector and undulator
FY2005 Long-lead purchases for injector, undulator
FY2006 Construction begins
January 2007 Injector tests begin
October FEL tests begin
September 2008 Construction complete
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

7. Construction Strategy
2003 – Project Engineering Design Begins
$6M budget
Prepare for Long-lead procurements in 2005
Undulator
Gun Laser
Injector Linac Systems
Spring 2003 – review of plans for long lead procurements
CD-2A Go-ahead required
Spring 2004 – Complete Preliminary Design of LCLS
CD-2 requirements complete for entire project
October 2004 – begin long-lead procurements
Summer 2005 – Critical Decision 3 – Approve start of construction
Winter 2007 – Begin FEL commissioning
October 2008 – Project Complete
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

8. Preliminary Schedule CD-0 CD-1 CD-2b CD-3b CD-2a CD-3a
FY2001
FY2002
FY2003
FY2004
FY2005
FY2006
FY2007
Design
2002
2003
2004
2005
2006
FY2008
FY2009
Construction
Operation
CD-3a
Critical Decision 0 – Mission Need June 13, 2001
Critical Decision 1 – Preliminary Baseline Range September 2002
Start Project Engineering Design October 2002
Critical Decision 2a – Long-Lead Procurement Budget Spring 2003
Critical Decision 2b – Performance Baseline April 2004
Critical Decision 3a – Start Long-Lead Procurements August 2004
Fund Long-Lead Procurements October 2004
Critical Decision 3b – Start Construction August 2005
Fund Construction October 2005
Construction Complete End of FY2008
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

9. Project Planning/Approval Status
Critical Decision 1 Approved 16 October 2002
Conceptual Design is judged sound
Preliminary Hazard Analysis accepted
Acquisition Execution Plan accepted
Preliminary Project Execution Plan accepted
Project Engineering Design Funds - $6M requested in 2003
LCLS PED funds are in House and Senate Committee Markups
LCLS PED is considered a New Start
Allocation under the continuing resolution budget is $0
Not quite as bad as it sounds
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

10. Workshop – Experimental Opportunities with LCLS – 8-9 October 2002
The LCLS Project is in its initial phase with a construction start scheduled for FY The DOE is planning
to provide specific funding for construction of experiments after Critical Decision 3 (start of LCLS
construction) has been taken, expected in mid 2005 calendar year. However, DOE will, starting in FY2003,
review and fund proposals for research needed to design an LCLS experiment. The purpose of this
Planning Workshop is to provide prospective LCLS researchers with the information necessary to start the
experiment planning process. It will also mark the beginning of a dialog between future LCLS experimenters
and the Project Team that will shape the development of the LCLS from conceptual design to running
facility.
30 Attendees, including “first Experiments” co-authors
Discussed Proposal/Review Sequence
LCLS Scientific Advisory Committee, chaired by Roger Falcone, UCB
Identification of R&D needs prerequisite to proposals
Timing and related diagnostics
Detectors
Damage studies
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

11. LCLS Science Program based on the SSRL Model
Experiment Proposals will be developed by leading research teams with SSRL involvement
Proposals will be reviewed by the LCLS Scientific Advisory Committee
Research teams secure outside funding with SSRL participation and sponsorship as appropriate
SSRL will manage construction
Provides cost and schedule control, rationalized design
Provides basis for establishing maintenance and support infrastructure
SSRL will partner with research teams to commission endstations
“General user” mode with beam time allocation based on SAC recommendations
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

12. Workshop – Experimental Opportunities with LCLS – 8-9 October 2002
Proposal sequence
LCLS actions
Prepare proposal guidelines
Call for letters of intent
Target late Spring 2003 for submission deadline
LCLS Scientific Advisory Committee Review
Request Pre-proposal R&D funds if necessary
Proposals reviewed by SAC
DOE will review/approve proposals in 2005 time frame
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

13. SLAC-DESY/TESLA FEL Collaboration
1 November SLAC/DESY FEL Collaboration Workshop
Albrecht Hermann Ray Jonathan
Wagner Schunck Orbach Dorfan
Director Ministry of DOE Office Director
DESY Science/Education of Science SLAC
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

14. SLAC-DESY/TESLA FEL Collaboration
January 2000 Memorandum of Understanding
SLAC-DESY-KEK FEL R&D
SLAC will deliver a bunch length measurement system to TTF
Expanded SLAC-DESY Collaboration, November
Sub-Picosecond Photon Source at SLAC (SPPS)
9 kev x-rays using SLAC linac and Final Focus Test Beam
12/2002 DESY personnel will participate in commissioning
DESY will join in SPPS experiments
TESLA Test Facility
SLAC personnel will participate in commissioning
SLAC participation in experiments to control temporal coherence
LCLS
TESLA-XFEL Participation in tests of optics
TESLA
2011—SLAC participation in TESLA-XFEL Commissioning
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

15. Common Challenges- High Brightness Electron Sources
Photocathode
Laser
Numerical techniques for gun design
Verification with experiment
Diagnostic Techniques
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

16. Photocathode Gun R&D Gun R&D 300pC 5 10 2 head tail
-1.5 -1
-0.5
0.5 1 50
100
150
Time (ps)
Peak Current (A)
Instantaneous Peak Current 5 10 2
Slice Emittances
n (mm mrad)
Slice number
300pC
head
tail
Spectrometer Image
of Slice Quad Scan Data
Gun R&D
BNL/SLAC/UCLA Gun has been proven
as an FEL driver at BNL-ATF and ANL
Basis of KEK, Frascati FEL designs
Design verification at the SSRL Gun Test Facility
Limborg, C. et al., “PARMELA versus Measurements for GTF and DUVFEL”
Proceedings of the 2002 European Particle Accelerator Conference, Paris
3-7 June 2002, pp
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

17. Common Challenges - Acceleration/Compression
SLAC linac tunnel
Undulator Hall
Linac-0
L =6 m
Linac-1
L =9 m
Linac-2
L =330 m
Linac-3
L =550 m
BC-1
BC-2
L =22 m
DL-2
L =66 m
DL-1
L =12 m
Undulator
L =121.8 m
150 MeV
z  0.83 mm
  0.10 %
250 MeV
z  0.19 mm
  1.8 %
4.54 GeV
z  mm
  0.76 %
GeV
  0.02 %
...existing linac
new RF
Gun
25-1a
30-8c
21-1b
21-1d X
Linac-X
L =0.6 m
21-3b
24-6d
Beam
Dump
Exp Halls
1.5 Å
8 GW
15 Å
17 GW
140 MeV MeV
2.5 GeV
7 MeV
  0.2 %
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

18. Common Challenge – Coherent Synchrotron Radiation
bend-plane emittance growth
January 14-18, 2002 at DESY-Zeuthen (Berlin, GERMANY) s
DE/E = 0 Dx
Chicane CSR Test-Case
DE/E < 0
Coherent Synchrotron Radiation
Theory
Numerical computations:
ANL, SLAC, TESLA, JLAB, ENEA
Experiment
Short, high current bunches
SC-wiggler damps bunching
S. Heifets, S. Krinsky, G. Stupakov, SLAC-PUB 9165, March 2002
Z. Huang, K. J. Kim, PRSTAB (2002)
E. Saldin, et al. TESLA-FEL (submitted to NIM)
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

19. Coherent Synchrotron Radiation
Definitive work in Coherent Synchrotron Radiation
theory, modeling  R e– l sz
coherent radiation for l > sz
overtaking length: L0  (24szR2)1/3 L0
(After BC1)
Theory (wig OFF)
Theory (wig ON)
Tracking (wig OFF)
Tracking (wig ON)
Z. Huang, et al. PRSTAB 5, (2002)
S. Heifets, et al. SLAC-PUB-9165, 3/2002
P. Emma,2002 European Part. Accel. Conf.
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

20. Short Bunch Diagnostics Tests Planned for TESLA, SLAC
P. Emma,
J. Frisch,
P. Krejcik,
G. Loew,
X.-J. Wang
2.44 m sx RF
‘streak’
V(t) e- sz
S-band
Tested at
SLAC
Tested at
TTF
Added to
TTF-II
D  90°
Initial laser chirp
Polarizer
Analyzer
EO Crystal
Bunch charge
Gated spectral signal
Spectrometer wl t ws I
Electron bunch
Co-propagating
Laser pulse
Beam pipe
Added To
SPPS
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

21. SASE Light Pulse length
LCLS Simulation
SASE light pulse shorter than electron bunch
LCLS Studies ongoing re: controllability
TTF x-ray pulse length
data
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

22. Common Goals – Seeding, Harmonic Generation
Si monochromator
(T = 40%)
230 fs
10 fs
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

23. News from DESY A more modest start for the TESLA XFEL Laboratory
20 GeV linac
3 FEL undulator sources
2 Spontaneous undulator sources
New Technical Design Report, budget submitted to German Science Council
DESY , TDR to be released shortly
More results from TTF:
J. Schulz, Coulomb Explosion of Rare Gas Clusters Irradiated by Intense VUV Pulses of a Free Electron Laser
J. Krzywinski, Interaction of Intense, Femtosecond Soft X-ray Pulses with Solids: Desorption, Ablation and
Plasma Formation by TTF FEL SASE Radiation
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

24. Sub-Picosecond Pulse Source
Ultrafast laser/x-ray physics - the Sub-Picosecond Photon Source
The SPPS collaboration will develop experimental techniques essential to LCLS science
Synchronization
Short pulse diagnostics for x-ray beams
Control of timing and pulse length
9 ps
0.4 ps
<100 fs
50 ps
SLAC Linac
1 GeV
20-50 GeV
FFTB
12-meter chicane compressor
5-meter undulator
Chicane installed
Wiggler inside FFTB tunnel
Construction of x-ray beamline underway
Chicane tests November-December 2002
X-ray experiments begin May 2003
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

25. Horizontal Trajectory
Undulator R&D
LCLS Undulator Prototype
Horizontal Trajectory
Microns
Prototype construction complete
Field quality specifications met
Ongoing investigation of thermal stability
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

26. Conclusion LCLS poised to start Project Engineering Design
PED for FY Preliminary design of undulator, injector – CD-2A
LCLS Collaboration well-matched to LCLS challenges
Accelerator science and technology
Synchrotron radiation research and instrumentation
Project management experience
Experiment Program Planning underway, based on successful SSRL model
LCLS pre-proposal R&D requests starting FY2003
Proposals for LCLS science in FY2006-FY2006
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

27. Selected LCLS Baseline Design Parameters
Fundamental FEL Radiation Wavelength Å
Electron Beam Energy GeV
Normalized RMS Slice Emittance mm-mrad
Peak Current kA
Bunch/Pulse Length (FWHM) fs
Relative Slice Energy Entrance < %
Saturation Length m
FEL Fundamental Saturation Exit GW
FEL Photons per Pulse
Peak Undulator Exit *
Transverse Coherence Full Full
RMS Slice X-Ray Bandwidth %
RMS Projected X-Ray Bandwidth %
* photons/sec/mm2/mrad2/ 0.1%-BW
BESAC Meeting 5 November 2002
John N. Galayda, SLAC

28. End of Presentation BESAC Meeting 5 November 2002
John N. Galayda, SLAC