David Schultz
9-12 February 2015

LCLS-II Concept
Use 1 st km of SLAC linac tunnel for CW SCRF linac
LCLS-II Scientific Opportunities
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LCLS-II Project Scope
Accelerator
Undulators in existing
LCLS-I Tunnel
Superconducting linac : 4 GeV
New variable gap (north)
New variable gap (south), replaces existing fixed-gap und.
Instruments Re-purpose existing instruments (instrument and detector upgrades needed to fully exploit)
4 GeV SC Linac
In sectors 0-10
North side source:
0.2-1.2 keV ( ≥ 100kHz)
NEH
South side source:
1.0 25 keV (120 Hz, copper” linac )
1.0 - 5 keV ( ≥ 100 kHz, SC Linac)
FEH
LCLS-II Scientific Opportunities
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Project Collaboration
LCLS-II Scientific Opportunities
• Cryomodule engineering/design
• Cryomodules: ~1/2 of total
• Liquid helium distribution system
• Cryomodules: ~1/2 of total
• Cryoplant design and procurement
• Undulators
• e gun & associated injector systems
• Undulator Vacuum Chamber
• Undulator design: vertical polarization
• Cryomodule R&D, prototype support
• e gun option
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LCLS-II Cryomodules
35 Cryomodules, 12.6 m long, 1 m diameter
• LCLS-II Cryomodule follows the ILC design (shown)
• 8 SC cavities and a SC quadrupole magnet
LCLS-II Scientific Opportunities
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Baseline Deliverables
Cu Linac
SC Linac
High Rep Rate
0
Legend
Cu SASE
Cu Self Seeded
High Rep Rate SASE
Self Seeded (Grating)
5
4.0 GeV
10 15
Photon Energy (keV)
20
 Hard X-Ray Source:
 1-5 keV w/ 4 GeV SC linac
 Up to 25 keV with LCLS Cu Linac
 Soft X-Ray Source:
 250 eV-1.2 keV w/ 4 GeV linac
 200 eV requires <4 GeV
25
LCLS-II Scientific Opportunities
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Project Timeline
• BESAC subcommittee report
• LCLS-II starts a response to the report
• Mission Need Statement signed
• Approval, CD-1
• Purchase niobium materials for cavities
• 4.2K refrigeration plant award
• Prototype accelerating modules test
• Remove copper linac, first km
• All cryomodules at SLAC
• Cryoplant installed
• First Light
• DOE Critical Decision 4 (Level 1)
LCLS-II Scientific Opportunities
July 2013
July 2013
Sep 2013
Jun 2014
Oct 2014
Apr 2015
Dec 2015
Jun 2016
Sep 2018
Dec 2018
Jan 2020
Sep 2021
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The LCLS-II Project: an extraordinary confluence of
• Institutional core competencies across the collaboration
• Talented, experienced scientists and engineers
• Strong management support at SLAC and the Partner Labs
• Outstanding support from DOE
LCLS-II Scientific Opportunities
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In Closing
• LCLS-II goals have been changed radically by the reconfiguration of the project
• High average brightness
•
The change had to come now- or else beyond 2030
• DOE has made a commitment to the long-term future of
SLAC as the home of the nation’s large-scale FEL research facility
• I believe that DOE understands
•
The scope of LCLS-II and its performance capabilities
• What LCLS ought to be in the long term
• Your input will determine the future capabilities of LCLS-II
LCLS-II Scientific Opportunities
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