1. LCLS History and Science Overview Keith Hodgson, SSRL Director April 23, 2002
LCLS DOE Review, April 23, 2002
Keith Hodgson, SSRL

2. From Storage Rings to Linacs
HEP SR
Storage rings
Single pass linacs
Free electron lasers (FELs)
Energy recovery linacs (ERLs)
Single pass linear colliders
LCLS DOE Review, April 23, 2002
Keith Hodgson, SSRL

3. LCLS Properties Enable Unique New Science
Peak Brightness
Average Brightness
LCLS DOE Review, April 23, 2002
Keith Hodgson, SSRL

4. LCLS History and Project Evolution – 1992 - 1999
February, 1992 – Workshop Proposal for a h ~ 10keV FEL Based on the SLAC Linac by C. Pellegrini, UCLA
February, 1992 – LCLS Technical Design Group formed by H. Winick
August, 1996 – The LCLS Design Study Group, under the leadership of Max Cornacchia, begins work on the first LCLS Design Report
December 1998 – The first edition of the LCLS Design Study Report is published
LCLS DOE Review, April 23, 2002
Keith Hodgson, SSRL

5. Scientific and Programmatic Recommendations
1994, National Research Council Study
“Free Electron Lasers and Other Advanced Sources of Light, Scientific Research Opportunities”
concluded that FELs were not competitive with conventional lasers for scientific applications except in the X-ray region.
1997, Birgeneau-Shen BESAC Subpanel Report
“DOE Synchrotron Radiation Sources and Science”
recommended funding an R&D program in next-generation light sources and convening another BESAC panel to focus on this topic.
1999, Leone BESAC Subpanel Report
“Novel, Coherent Light Sources”
concluded: “Given currently available knowledge and limited funding resources, the hard X-ray region (8-20 keV or higher) is identified as the most exciting potential area for innovative science. DOE should pursue the development of coherent light source technology in the hard X-ray region as a priority. This technology will most likely take the form of a linac-based free electron laser using self-amplified stimulated emission or some form of seeded stimulated emission…”
LCLS DOE Review, April 23, 2002
Keith Hodgson, SSRL

6. LCLS Program – the R&D Phase
The LCLS R&D effort, led by J.M. Paterson, receives BESAC support (at the level of ~ $ M/year, )
Collaborating Laboratories (SLAC/SSRL, ANL/APS, LLNL, BNL/NSLS, LANL, and UCLA) responsible for R&D effort addressing issues on key areas including:
Undulator Prototype
Gun Development
SASE Physics and Simulations
LCLS DOE Review, April 23, 2002
Keith Hodgson, SSRL

7. LCLS History and Project Evolution – Recent Events
April, 2001 John Galayda joins SSRL/SLAC as Project Director
June, 2001 CD0 (Statement of Mission Need) Approved by DOE
January, 2002 DOE Guidance on Scope and Schedule
February, 2002 President’s FY2003 Budget Includes LCLS PED Funding
February, 2002 LCLS Science Advisory Committee Meets and Formulates Strategy for Framework of Experimental Program Development
April, 2002 DOE Lehman Project Review (4/23-25)
LCLS DOE Review, April 23, 2002
Keith Hodgson, SSRL

8. LCLS Properties Enable Unique New Science
Peak brightness exceeds existing X-ray sources by > 109
Time resolution exceeds 3rd gen. synchrotron sources by a factor 103
Coherence: degeneracy parameter exceeds present sources > 109
~50 ps
 230 fs
coherence volume 1 x 5 x 50 mm
coherence volume 0.1 x 100 x 100 mm
3rd gen. beam line
LCLS source
contains 109 photons
contains 1 photon
LCLS DOE Review, April 23, 2002
Keith Hodgson, SSRL

9. LCLS Properties Enable Unique New Science
Flux density can be varied by
focussing: factor 106
X-ray absorption can be varied by
tuning energy: factor
X-ray absorption depends on
atomic number: factor 105
LCLS Beam can Probe or Manipulate Matter
0.1 x 0.1 mm
100 x 100 mm
LCLS DOE Review, April 23, 2002
Keith Hodgson, SSRL

10. LCLS Science Program – Opportunities for Discovery
Femtochemistry Dan Imre, BNL
Nanoscale Dynamics in Brian Stephenson,
Condensed matter APS
Atomic Physics Phil Bucksbaum, Univ. of Michigan
Plasma and Warm Dense Richard Lee, LLNL
Matter
Structural Studies on Single Janos Hajdu,
Particles and Biomolecules Uppsala Univ.
Program developed by international team of ~45 scientists working with accelerator and laser physics communities
X-ray Laser Physics LCLS Team
LCLS DOE Review, April 23, 2002
Keith Hodgson, SSRL

11. LCLS Science Program – Strategy for Development
LCLS SAC is being reformulated as external advisory and oversight committee to consider proposals for LCLS instruments and science – being chaired by Prof. R. Falcone of UC Berkeley
At last meeting of current SAC (2/8/02), SAC strongly endorsed principle of open, peer-reviewed access and competition based on science for decision making and operation in a general user (not a PRT or CAT) model where SSRL coordinates activity (peer review) and technical management/general operation for scientific teams – developed a framework for moving forward
PED
Construction
FY02 03 04 05 06 07 O N D J F M A S
Planning Workshop
Funding for instruments
DOE accepts proposals for instruments
Call for LOI and R&D plans
Review proposals and approve submissions
LCLS DOE Review, April 23, 2002
Keith Hodgson, SSRL

12. Summary
The LCLS will be a source of unprecedented brightness and coherence, delivered in sub-picosecond X-ray pulses
It is the most rapid and cost effective path to a 4th generation X-ray synchrotron light facility
It is based on technology and know-how available at the collaborating institutions and takes advantage of the availability of the SLAC Linac
Builds on activities of DOE laboratories and universities in synchrotron R&D and in laser physics and accelerator science
R&D activities coordinate well with efforts in Europe and plans for future XFEL facility at DESY
Will be an extraordinary new scientific tool continuing the DOE tradition of providing outstanding facilities to the research community
We look forward to the Committee’s careful review of the technical design, project management, schedule and cost for the LCLS project
LCLS DOE Review, April 23, 2002
Keith Hodgson, SSRL