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Philip Cutino, P.E. 6th International Workshop on Cryogenics Operations

The Linac Coherent Light Source-II Superconducting RF upgrade to the world’s first hard X-ray free-electron laser. Philip Cutino, P.E. 6th International Workshop on Cryogenics Operations November 10 - 12, 2014. LCLS-II & SLAC National Accelerator Laboratory. 18kW Cryoplant. 1 km

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Philip Cutino, P.E. 6th International Workshop on Cryogenics Operations

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  1. The Linac Coherent Light Source-IISuperconducting RF upgrade to the world’s first hard X-ray free-electron laser Philip Cutino, P.E. 6th International Workshop on Cryogenics Operations November 10 - 12, 2014

  2. LCLS-II & SLAC National Accelerator Laboratory 18kW Cryoplant 1 km New SRF Linac New Variable Gap Undulators 6th International Workshop on Cryogenics Operations STFC Daresbury Laboratory, UK, November 10 - 12, 2014

  3. LCLS-II Accelerator LayoutNew Superconducting Linac&Undulators • Two sources: high rate SCRF linac and 120 Hz Cu LCLS-I linac • North and South undulators can operate simultaneously in any mode • Two sources: high rate SCRF linac and 120 Hz Cu LCLS-I linac • North and South undulators can operate simultaneously in any mode Concurrent operation of 1-5 keV and 5-25 keV is not possible Concurrent operation of 1-5 keV and 5-25 keV is not possible 0.2-1.3 keV (120 kW) 4 GeV, 0.3 mA, 1.2 MW 4 GeV SC Linac Cu Linac SCRF Linac in 1st km of SLAC tunnel 1.0 - 25 keV (120 Hz) 1.0 - 5 keV (120 kW) Existing LCLS 6th International Workshop on Cryogenics Operations STFC Daresbury Laboratory, UK, November 10 - 12, 2014

  4. Project Collaboration • 50% of cryomodules: 1.3 GHz • Cryomodules: 3.9 GHz • Cryomodule engineering/design • Helium distribution • Processing for high Q (FNAL-invented gas doping) • 50% of cryomodules: 1.3 GHz • Cryoplant selection/design • Processing for high Q • Undulators • e- gun & associated injector systems • Undulator Vacuum Chamber • Also supports FNAL w/ SCRF cleaning facility • Undulator R&D: vertical polarization • R&D planning, prototype support • processing for high-Q (high Q gas doping) • e- gun option 6th International Workshop on Cryogenics Operations STFC Daresbury Laboratory, UK, November 10 - 12, 2014

  5. Cryogenic System Distribution Boxes 6th International Workshop on Cryogenics Operations STFC Daresbury Laboratory, UK, November 10 - 12, 2014

  6. LCLS-II Cryoplantis modeled after the JLAB CHL2 Single 2K Cryogenic Plant based on CHL-2 (Jlab) JLab CHL-2 does not have an intermediate-temperature cryogen ‘intercept’ circuit Otherwise the same design Typical 2K System 6th International Workshop on Cryogenics Operations STFC Daresbury Laboratory, UK, November 10 - 12, 2014

  7. Nitrogen doping: unprecedented breakthrough in Q Record after nitrogen doping – up to 4 times higher Q! Standard state-of-the art preparation LCLS-II spec This was the highest Q possible up to 2012 “Could be marginal for 2 cryoplants” 1.3 GHz A. Grassellino et al, 2013 Supercond. Sci. Technol. 26 102001 (Rapid Communication) 6th International Workshop on Cryogenics Operations STFC Daresbury Laboratory, UK, November 10 - 12, 2014

  8. LCLS-II CryomoduleSLAC Tunnel Slope ~0.5% (56mm/CM) 6th International Workshop on Cryogenics Operations STFC Daresbury Laboratory, UK, November 10 - 12, 2014

  9. LCLS-II Cryomodule in existing Tunnel 6th International Workshop on Cryogenics Operations STFC Daresbury Laboratory, UK, November 10 - 12, 2014

  10. Timeline • LCLS • Proposal – 1992 • DOE officially recognized need – 2000 • First light – 2009 • LCLS-II • Planning – 2013 • Collaboration goal for first light – 2019 6th International Workshop on Cryogenics Operations STFC Daresbury Laboratory, UK, November 10 - 12, 2014

  11. Challenges Aggressive schedule • Leverage existing designs • Lessons learned from experienced partner labs Adapting & connecting proven (but different) designs • XFEL/ILC style cryomodules • CW operation • 0.5% grade in tunnel • High Q program • Fast cool-down • 18 kW plant (Jlab) • Tight space • CW SRF Technology is new to SLAC 6th International Workshop on Cryogenics Operations STFC Daresbury Laboratory, UK, November 10 - 12, 2014

  12. Acknowledgements The LCLS-II collaboration gratefully acknowledge invaluable help that LCLS-II has received from colleagues in the ILC Global Design Effort, as well as the European XFEL Project and DESY. Thanks to Anna Grassellino, ArkadiyKlebaner, Tom Peterson, Dana Arenius, Marc Ross and John Galayda for use of their material in this presentation 6th International Workshop on Cryogenics Operations STFC Daresbury Laboratory, UK, November 10 - 12, 2014

  13. End www.slac.stanford.edu http://accelconf.web.cern.ch/AccelConf/IPAC2014/talks/tuoca01_talk.pdf http://jacow.web.psi.ch/conf/linac14/prepress/TUIOA04.PDF https://news.slac.stanford.edu/announcement/science-slac-video-slac-goes-cryo

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