Linac Coherent Light Source Update John N. Galayda, Stanford Linear Accelerator Center 5 November 2002

1
Linac Coherent Light Source UpdateJohn N.
Galayda, Stanford Linear Accelerator Center5
November 2002

• Overview
• Project Status
• LCLS user workshop
• Collaboration with TESLA
• Project RD

2
Overview

• The worlds first hard x-ray laser
• Unprecedented brightness, Unprecedented time
  resolution
• 0.8 8 keV SASE Free Electron Laser
• Electron beam 4.5 14.35 GeV, from SLAC Linac
• Peak power in SASE bandwidth 8 GW
• Peak brightness 1033 photons/(mm2 mr2 0.1BW)
• Pulse duration ? 230 femtoseconds
• Pulse repetition rate 120 Hz

3
LCLS Operating Ranges
4
Linac Coherent Light Source
1992 Proposal (C. Pellegrini) 1998 Preliminary
Design Study Completed 1999 RD funded at
1.5M/year 2001 CD-0 2002 Conceptual Design
http//www-ssrl.slac.stanford.edu/lcls/CDR/ 2003
Project Engineering Design begins 2005 Long-Lead
Procurements begin 2006 Construction
begins 2007 First Light 2008 Project completion
5
Conventional Construction

• Final Focus Test Beam Extension
• Hall A
• Tunnel
• Hall B

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 2007 FEL tests begin
• September 2008 Construction complete

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

8
Preliminary Schedule
CD-1
CD-2b
CD-3b
CD-0
CD-2a
Design
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
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

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 2006. 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 RD needs prerequisite to
  proposals
• Timing and related diagnostics
• Detectors
• Damage studies

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

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 RD funds if necessary
• Proposals reviewed by SAC
• DOE will review/approve proposals in 2005 time
  frame

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
14
SLAC-DESY/TESLA FEL Collaboration

• January 2000 Memorandum of Understanding
• SLAC-DESY-KEK FEL RD
• SLAC will deliver a bunch length measurement
  system to TTF
• Expanded SLAC-DESY Collaboration, November 1 2002
• 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
• 2003-2006 DESY will join in SPPS experiments
• TESLA Test Facility
• 2003-2004 SLAC personnel will participate in
  commissioning
• 2005-2006 SLAC participation in experiments to
  control temporal coherence
• LCLS
• 2007-2008 TESLA-XFEL Participation in tests of
  optics
• TESLA
• 2011SLAC participation in TESLA-XFEL
  Commissioning

15
Common Challenges- High Brightness Electron
Sources

• Photocathode
• Laser
• Numerical techniques for gun design
• Verification with experiment
• Diagnostic Techniques

16
Photocathode Gun RD
Gun RD 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. 1786-1788
17
Common Challenges - Acceleration/Compression
18
Common Challenge Coherent Synchrotron Radiation
bend-plane emittance growth
January 14-18, 2002 at DESY-Zeuthen (Berlin,
GERMANY)
DE/E 0
s
Dx
Chicane CSR Test-Case
DE/E lt 0

• Coherent Synchrotron Radiation
• Theory
• Numerical computations
• ANL, SLAC, TESLA, JLAB, ENEA
• Experiment
• Short, high current bunches

S. Heifets, S. Krinsky, G. Stupakov, SLAC-PUB
9165, March 2002 Z. Huang, K. J. Kim, PRSTAB 5
074401(2002) E. Saldin, et al. TESLA-FEL 2002-2
(submitted to NIM)
19
Coherent Synchrotron Radiation
Definitive work in Coherent Synchrotron
Radiation theory, modeling
Z. Huang, et al. PRSTAB 5, 074401 (2002) S.
Heifets, et al. SLAC-PUB-9165, 3/2002 P.
Emma,2002 European Part. Accel. Conf.
20
Short Bunch Diagnostics Tests Planned for TESLA,
SLAC
P. Emma, J. Frisch, P. Krejcik, G. Loew, X.-J.
Wang
S-band
Added to TTF-II
Tested at SLAC Tested at TTF
Added To SPPS
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
22
Common Goals Seeding, Harmonic Generation
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 2002-167, TDR to be released shortly
• More results from TTF http//www.aps.anl.gov/f
  el2002/talks/talks.html
• 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

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

• Chicane installed
• Wiggler inside FFTB tunnel
• Construction of x-ray beamline underway
• Chicane tests November-December 2002
• X-ray experiments begin May 2003

25
Undulator RD
LCLS Undulator Prototype
Horizontal Trajectory

Microns

• Prototype construction complete
• Field quality specifications met
• Ongoing investigation of thermal stability

26
Conclusion

• LCLS poised to start Project Engineering Design
• PED for FY2003 - 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 RD requests starting FY2003
• Proposals for LCLS science in FY2006-FY2006

27
Selected LCLS Baseline Design Parameters

• Fundamental FEL Radiation Wavelength 1.5 15 Å
• Electron Beam Energy 14.3 4.5 GeV
• Normalized RMS Slice Emittance 1.2 1.2
  mm-mrad
• Peak Current 3.4 3.4 kA
• Bunch/Pulse Length (FWHM) 230 230 fs
• Relative Slice Energy Spread _at_ Entrance
  lt0.01 0.025
• Saturation Length 87 25 m
• FEL Fundamental Saturation Power _at_ Exit 8
  17 GW
• FEL Photons per Pulse 1.1 29 1012
• Peak Brightness _at_ Undulator Exit 0.8
  0.06 1033
• Transverse Coherence Full Full
• RMS Slice X-Ray Bandwidth 0.06 0.24
• RMS Projected X-Ray Bandwidth 0.13 0.47
• photons/sec/mm2/mrad2/ 0.1-BW

28
End of Presentation