rotang vacuum seal · rotang vacuum seal learning from experiences of slc and nlc t. omori (kek),...
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Rota%ng Vacuum Seal Learning from Experiences of SLC and NLC
T. Omori (KEK), with many thanks to Marc-san 29 Oct 2009, Durham ILC e+ Meeting
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SLC and NLC targets SLC e+ target(s): The only e+ target(s) for a LC in which we have real operation experience.
NLC e+ target design study: Very seriously studied (many drawings remains) by SLAC people (they have SLC experience).
Learning from SLC and NLC experiences may help ILC target design.
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SLC targets In the SLC project, three types of targets were made. They were, in chronological order, (a) Rotation Target (seal: ferromagnetic fluid), (b) Stationary Target, (c) Trolling Target (seal: bellows).
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SLC Rota%on Target Specification (SLAC-PUB-4437) • Diameter : 0.15 m • Rotation Speed : no data • Tangential Speed: no data • Vacuum Seal : ferromagnetic fluid
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SLC Rota%on Target
What happened (SLAC-PUB-4704) • Capture section failed to achieve high gradient. • This target was suspect (especially the ferromagnetic rotating seal) as a possible cause of contamination in the RF section. • This target had never been operated in actual SLC operations.
Specification (SLAC-PUB-4437) • Diameter : 0.15 m • Rotation Speed : no data • Tangential Speed: no data • Vacuum Seal : ferromagnetic fluid
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SLC Trolling Target Specification • Tangential Speed: 0.1 m/s • Vacuum Seal : bellows The target was used in SLC running in several years.
Mechanism similar to a piston and a crank of a reciprocating engine (piston engine)
Target head swings
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SLC Trolling Target Specification • Tangential Speed: 0.1 m/s • Vacuum Seal : bellows The target was used in SLC running in several years.
Mechanism similar to a piston and a crank of a reciprocating engine (piston engine)
Target head swings
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SLC ‐‐> NLC • Bellows is very reliable way to seal vacuum.
• No Oil, No liquid of any kind --> No cause of contamination • Very tight seal --> Good Vacuum
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SLC ‐‐> NLC • Bellows is very reliable way to seal vacuum.
• No Oil, No liquid of any kind --> No cause of contamination • Very tight seal --> Good Vacuum
• But bellows allows only reciprocating motion.
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SLC ‐‐> NLC • Bellows is very reliable way to seal vacuum.
• No Oil, No liquid of any kind --> No cause of contamination • Very tight seal --> Good Vacuum
• But bellows allows only reciprocating motion.
• NLC target needs much faster tangential speed than SLC.
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SLC ‐‐> NLC • Bellows is very reliable way to seal vacuum.
• No Oil, No liquid of any kind --> No cause of contamination • Very tight seal --> Good Vacuum
• But bellows allows only reciprocating motion.
• NLC target needs much faster tangential speed than SLC.
• NLC design: rotation seal other than ferromagnetic fluid.
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NLC Rota%on Target Design Specification (SLAC-PUB-6852, SLAC-PUB-7270, ZEROTH-ORDER DESIGN REPORT)
• Diameter : 0.2 m • Rotation Speed : 120 rpm (depends on paper/document) • Tangential Speed : 1.2 m/s • Vacuum Seal : labyrinth seals + diff. pumping + face seal with carbon contacting
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NLC Rota%on Target Design Specification (SLAC-PUB-6852, SLAC-PUB-7270, ZEROTH-ORDER DESIGN REPORT)
• Diameter : 0.2 m • Rotation Speed : 120 rpm (depends on paper/document) • Tangential Speed : 1.2 m/s • Vacuum Seal : labyrinth seals + diff. pumping + face seal with carbon contacting
Drawing Exits, But No Prototype
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NLC Rota%on Target Design
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bearing
NLC Rota%on Target Design
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bearing
?
NLC Rota%on Target Design
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bearing labyrinth seals
?
NLC Rota%on Target Design
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bearing labyrinth seals
diff pumping
?
NLC Rota%on Target Design
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bearing labyrinth seals
diff pumping
face seal
?
NLC Rota%on Target Design
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Vacuum Seal Design of NLC Rota%on Target
Vacuum
Air
Shaft
pumping pumping pumping
Vacuum Vessel
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Vacuum Seal Design of NLC Rota%on Target
Vacuum
Air
Shaft
labyrinth seals
pumping pumping pumping
Vacuum Vessel
10 – 15 micron
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Vacuum Seal Design of NLC Rota%on Target
Vacuum
Air
Shaft
labyrinth seals
pumping face seal
carbon contac%ng ring & bellows style spring
pumping pumping
Vacuum Vessel
10 – 15 micron
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Summary • We need to develop rotation vacuum seal for ILC.
• Try ferromagnetic seal again? • Try labyrinth seal? • New Idea?