Status and Progress
Transcript of Status and Progress
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Outline
• Overview of LCLS-II• Schedule • Cryomodule performance• Installation progress and challenges• Installation status• Looking forward to HE• Lessons learned
This talk will summarize the current status of the LCLS-II x-ray free electron laser installation progress and the upcoming commissioning plans. The overall state of the machine will be reviewed and a summary of the cryomodule performance in the testing facilities will be provided. In addition some of the key lessons learned from installation and integration will be discussed.
Slide 3
LCLS-IINew Injector andNew Superconducting Linac
Existing Bypass Line
New Transport Line
Two New UndulatorsAnd X-Ray Transport
Reconfigure Near Experiment Hall
New Cryoplant
Remove SLACLinac fromSectors 0-10
SRF'21 LCLS-II Status and Progress
LCLS-II Project Timeline - 15 Months to First Light
RECENT PROGRESS
• Undulators installed and performance demonstrated with Cu linac
• Cryoplant #1 4.5K Cold box commissioning underway
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Cryoplant 1 Installation Complete
All Cryomodulesconnected
37 of 37 CryomodulesInstalled Today
Linac Cool Down/Commissioning
First Light
Undulator Installation Complete
All Undulators Installed
Today95% Complete
Cryoplant 1 Commissioning Complete
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The Linac – SRF Deliverables
• Receipt of 41 cryomodules at SLAC (38 – 1.3 GHz, 3 – 3.9 GHz)• Installation of 37 cryomodules (35 – 1.3 GHz, 3 – 3.9 GHz)• Installation of 37 beamline absorbers and 5 beamline bellows• Completion of 5 insulating vacuum sections• Termination of 40,000+ cables (linac and undulator halls)
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Cavity Summary – Demonstration of Industrial N2 Doping
• 373 – 1.3 GHz cavities ordered • 37 sent back to vendor
for rework• 304 installed in 38
production CMs• 26 – 3.9 GHz cavities
ordered• 2 sent back to vendor for
rework• 24 installed in 3
production CMs
1.3 GHz Cavity Parameter Value
Cavities Tested 410*
% Requiring Reprocessing 32%
% With FE In 1st Test 24%
% Not Solved by 1 Re-Rinse 2.9%
% Requiring EP to Clean FE 0.2%
% With Cold Leaks 2.9%
*Includes cavities that were reworkedOverall, cavity production reached similar re-processing rates to XFEL, but considerable
oversight was required*see D. Gonnella 2019 TTC talk for more details
All testing performed at Jefferson Lab and Fermilab Courtesy of Dan Gonnella
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Overall Cryomodule Performance – Individual Tests
Successful demonstration of the first large scale nitrogen doped SRF cavity production by Industry
Courtesy of Dan Gonnella
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Installation by the numbers
• 41 CMs delivered to SLAC from JLaband FNAL over a period of 2 years
• CM installation took place over 22 months
• CM interconnect welding
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Cryomodule Installation and Challenges
• 504 weld joints completed – 168 m of welding• 1 interconnect had to be repaired due to failure of 300
mm bellows – vendor defect• 42 particle free interconnections made
• Beamline height is a challenge
• 288 Solid State Amplifiers Installed (8 outstanding)• 74 LLRF Racks installed• LLRF -> HPRF integration testing underway
involves using the LLRF and SSAs to power warm CM cavities up to 400 Watts CW
• Waveguide non-ionizing radiation surveys are performed to ensure the waveguide is RF leak tight
• Power measurements are made at the directional couplers near the cryomodule for comparison to LLRF values
• SSAs are briefly (<200 µs) chirped to 4 kW and the SSA health is characterized
RF Installation and Checkout
Courtesy of Andy Benwell 11
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Take-aways
1. Industrial partners can adapt to meet our needs • N2 doping of SRF cavities
2. More time taken with vendors on the front end is critical3. Partnerships for big science are win win4. We (The SRF community) need to invest in training the
next generation of Scientist, Engineers and Technicians
Thanks to the dedication and hard work of a huge group of people LCLS-II is nearly ready for RF commissioning