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Fermilab PIP Booster Accelerator RF Cavity Refurbishment
Matt Slabaugh
ARW 2015
27 April 2015
Topics
• Proton Improvement Plan (PIP)• Booster Radio Frequency (RF) Cavities• Cavity Refurbishment• Tuner Refurbishment• Planning for failure• Testing and Summary
4/27/2015M. Slabaugh | Fermilab PIP Booster Accelerator RF Cavity Refurbishment2
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Booster RF Cavity
4/27/2015M. Slabaugh | Fermilab PIP Booster Accelerator RF Cavity Refurbishment
Circa. 1969bid drawing(obsolete)
Critical advantage: Access to retired personnel with development knowledge
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Cavity Refurbishment- Scope
4/27/2015M. Slabaugh | Fermilab PIP Booster Accelerator RF Cavity Refurbishment
Vacuum
Misc.
RF Contact
Cavities are radioactive and fragile!
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Cavity Refurbishment- RF Contact
4/27/2015M. Slabaugh | Fermilab PIP Booster Accelerator RF Cavity Refurbishment
Milling improved quality, reduced time and distance (dose). ~ 7 days2 days
Insufficient contact= heat and RF leakage
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Cavity Refurbishment- Vacuum Repair and Upgrade
4/27/2015M. Slabaugh | Fermilab PIP Booster Accelerator RF Cavity Refurbishment
Leaking “pie-tin” quick disconnect flange
Removal with Wach’s tool
Replace with solid flange
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Cavity Refurbishment
4/27/2015M. Slabaugh | Fermilab PIP Booster Accelerator RF Cavity Refurbishment
Water cooling repair/upgrade
Alignment fiducials installedImprovised repair tooling
Internal sparking and damage
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Tuner Refurbishment
4/27/2015M. Slabaugh | Fermilab PIP Booster Accelerator RF Cavity Refurbishment
Contact surfaces
Cones
Cooling lines
Each tuner:• 500+ pieces • 150ft+ tubing • 50+ water connections• 44in long • 650lbs
Ferrite
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Tuner Refurbishment
4/27/2015M. Slabaugh | Fermilab PIP Booster Accelerator RF Cavity Refurbishment
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Tuner Refurbishment- Risk
4/27/2015M. Slabaugh | Fermilab PIP Booster Accelerator RF Cavity Refurbishment
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Tuner Refurbishment- Procurement and challenges
4/27/2015M. Slabaugh | Fermilab PIP Booster Accelerator RF Cavity Refurbishment
• Difficult procurement– Stock items not stock (tube sizes)– Common processes no longer
common– Unusual materials
• Original drawings not updated– Undocumented revisions– All hand drawings, no CAD
• Little data available for optimizing design changes or benchmarking
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Tuner Refurbishment- Planning for failure
• Have begun building new tuner assemblies• Potentially replace all refurbished tuners with new
4/27/2015M. Slabaugh | Fermilab PIP Booster Accelerator RF Cavity Refurbishment
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Cavity Testing and Summary
• Each assembly tested for two weeks prior to install• Thermal sensors near critical surfaces for real time data• Beginning production of two spare cavities
4/27/2015M. Slabaugh | Fermilab PIP Booster Accelerator RF Cavity Refurbishment
• 17 of 20 cavities installed
• 50 tuners refurbished
• 3 tuners built new