fermilab pip booster accelerator rf cavity refurbishment · booster rf cavity 3 m. slabaugh |...
TRANSCRIPT
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Fermilab PIP Booster Accelerator RF
Cavity Refurbishment
Matt Slabaugh
ARW 2015
27 April 2015
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Topics
• Proton Improvement Plan (PIP)
• Booster Radio Frequency (RF) Cavities
• Cavity Refurbishment
• Tuner Refurbishment
• Planning for failure
• Testing and Summary
4/27/2015 M. Slabaugh | Fermilab PIP Booster Accelerator RF Cavity Refurbishment 2
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Booster RF Cavity
4/27/2015 M. Slabaugh | Fermilab PIP Booster Accelerator RF Cavity Refurbishment 3
Circa. 1969 bid drawing (obsolete)
Critical advantage: Access to retired personnel with development knowledge
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Cavity Refurbishment- Scope
4/27/2015 M. Slabaugh | Fermilab PIP Booster Accelerator RF Cavity Refurbishment 4
Vacuum
Misc.
RF Contact
Cavities are radioactive and fragile!
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Cavity Refurbishment- RF Contact
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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
4/27/2015 M. Slabaugh | Fermilab PIP Booster Accelerator RF Cavity Refurbishment 6
Leaking “pie-tin” quick disconnect flange
Removal with Wach’s tool
Replace with solid flange
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Cavity Refurbishment
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Water cooling repair/upgrade
Alignment fiducials installed Improvised repair tooling
Internal sparking and damage
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Tuner Refurbishment
4/27/2015 M. Slabaugh | Fermilab PIP Booster Accelerator RF Cavity Refurbishment 8
Contact surfaces
Cones
Cooling lines
Each tuner:
• 500+ pieces
• 150ft+ tubing
• 50+ water connections
• 44in long
• 650lbs
Ferrite
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Tuner Refurbishment
4/27/2015 M. Slabaugh | Fermilab PIP Booster Accelerator RF Cavity Refurbishment 9
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Tuner Refurbishment- Risk
4/27/2015 M. Slabaugh | Fermilab PIP Booster Accelerator RF Cavity Refurbishment 10
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Tuner Refurbishment- Procurement and challenges
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• 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
4/27/2015 M. Slabaugh | Fermilab PIP Booster Accelerator RF Cavity Refurbishment 12
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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
4/27/2015 M. Slabaugh | Fermilab PIP Booster Accelerator RF Cavity Refurbishment 13
• 17 of 20 cavities
installed
• 50 tuners
refurbished
• 3 tuners built new