April 25 2012 Joe Conway 4 basic vacuum chamber types Antechamber Arcs Grooved Antechamber Arc Dipoles Chicane Wiggler Straight Straight chamber round Al extrusion with TiN coating and solenoids 50mm inner diameter ID: 210309
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Slide1
DR Vacuum Component OverviewApril 25, 2012
Joe ConwaySlide2
4 basic vacuum chamber typesAntechamber (Arcs)Grooved Antechamber (Arc Dipoles, Chicane)Wiggler
Straight
Straight chamber: round Al extrusion with TiN coating and solenoids. 50mm inner diameterSliding joints and BPMs taken from RDR
Vacuum Components Intro
April 25, 2012
KILC’12
2Slide3
Aluminum extrusion,
TiN
CoatedDual antechamberSloped Antechamber wallsUsed in Arcs and ChicaneGrooved version used in all dipoles
50mm main chamber diameter1cm Antechamber height, both sides
35° antechamber wall slope
Antechamber Type
April 25, 2012
KILC’12
3
Could use ERL style NEG hangers in antechambers (next slide) or
SuperKEKB
style maybeSlide4
Aluminum extrusion,
TiN
CoatedUsed in Dipoles in Arcs and Chicane50mm main chamber diameter1cm Antechamber height, both sides
35° antechamber wall slope20 grooves top and bottom2mm height, 18° opening angle
Shows Cornell ERL style NEG hanger
locations
Grooved Antechamber Type
April 25, 2012
KILC’12
4Slide5
Copper Extrusion
Tungsten clearing electrode on bottom
46mm main chamber diameter2cm tall antechambers both sides35° antechamber wall slope
TiN
coated AL extrusion with same inner dimensions used in Wiggler section drifts
Wiggler Vacuum Chambers
April 25, 2012
KILC’12
5Slide6
Aditional Wiggler Chamber Drawing
April 25, 2012
KILC’12
6Slide7
Photon stops based on RDR Design0.76m longDedicated ion pump + TiSPs
?
Large photon stop in first bend at end of Wiggler straight in first bendPrevents photons from wiggler straight reflecting down the arc
Ion Pumping and vacuum chamber end treatments same style as ERL conceptsCF flanges with reusable RF inserts inside CF gasket similar to ERL style
Other Elements
April 25, 2012
KILC’12
7Slide8
DiscussionApril 25, 2012
KILC’12
8
Wiggler Chambers
Box extrusion in copper probably not possible, specially with NEG hanger details
Should cost as if machining chamber out of solid copper block
Unlikely to need angled walls in antechamber section due to photon stops preventing photons from striking outer antechamber walls.
NEG strips should be recessed further into chamber to prevent RF heating
Weld on cooling channels after thermal spray and e-beam welding chamber halves
together
Need cooling detail and distributed pumping detail in all vacuum chambers
AL-SS bonded
trasitions
at ends of every chamber? Use AL flanges? Regional differences
Gate Valves in Wiggler straight?