Download - NLC - The Next Linear Collider Project IR Layout Tom Markiewicz SLAC LCWS Cornell 15 July 2003
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NLC - The Next Linear Collider Project
IR LayoutTom Markiewicz
SLAC
LCWS Cornell15 July 2003
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Tom Markiewicz#2 of 15
IR Layout Issues
• IR Hall Dimensions• Detector Access Model
– Maintenance– Component Replacement
• Final Doublet Support Scheme• Tungsten Mask Design and Support
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Tom Markiewicz#3 of 15
IR Hall Dimensions• Set by Knut Skarpass / Marty
Breidenbach– ~1999 – NLC Tunnel model then “cut & cover”– No push-back from accelerator side– “Small” & “Large” Detectors
33m
62m
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Tom Markiewicz#4 of 15
Current Large Detector Access Model
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6
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Door Support (3.2m)
Endcap ECAL@ 3m
Permanent Support / Moveable Shielding
Pit Wall (14.8m)
Moveable Shielding /
Moveable Support
6.7m
10.4m
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Tom Markiewicz#5 of 15
IR Halls In Mountainside (CA) or ~300’ Underground
(DeKalb, IL)
Point 1: Do we need all that space given cost of underground caverns, tunnels & shafts
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Tom Markiewicz#6 of 15
Current Final Quad Support Scheme: Cantilever 40cm diameter Tube from DOOR
CLOSED Position
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Must remove (red) platform and clamps that anchor end of tube to open door
Point 2: Save 3.7m (-10.4-6.7) of extra cantilever but limit access, or is there a better way?
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Tom Markiewicz#7 of 15
VXD/TPC Replacement
If detector stays on the IP and one door is opened one can slide TPC 3.7m and
expose central 2m of beamlineIs this enough for VXD replacement?
If Central Barrel of Detector and one door is slid to one side and the opposite door is opened
5.6m free space is available(TPC currently sized at 5.4m)
How much real estate do we need to reserve for this type of activity?
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Tom Markiewicz#8 of 15
IP Masks 1996-2000: L*=2.0m
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SD
LD
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Tom Markiewicz#9 of 15
IP Masks 2000-2001: L*=4.3m
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LD
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Tom Markiewicz#10 of 15
IP Masks Snowmass 2001-2003: L*=3.8m
SD
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Tom Markiewicz#11 of 15
Changes to Masking due to getting real about and prototyping and
stabilizing the final quad• Cylindrical M2 W masking now OUTSIDE the
support tube• Demand that Masks & Pair-Luminosity
monitor be supported in some “to be determined” manner from detector
• Allow length of conic M1 mask to grow back to 1999 lengths and assume its weight will also be borne by detector when vibration stabilization systems are active & symmetrize LD & SD
• Inner radial masses must be transferred to support tube when detector doors are open
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Tom Markiewicz#12 of 15
LD Forward Masking, Calorimetry & Tracking 2003-06-01
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0
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HCAL
ECAL
W
W
W
W
Support Tube
Pair-LuMonQD0
Inst. Mask
BeamPipeLowZ Mask
Exit radius 2cm @ 3.5m
48mrad
101mrad
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Tom Markiewicz#13 of 15
SD Forward Masking, Calorimetry & Tracking 2003-06-01
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QD0
Inst. Mask
HCAL
ECAL
YOKE
W
W
46mrad
113mrad
Support Tube
Pair-LuMon
BeamPipe LowZ MaskExit radius
2cm @ 3.5m
W
W
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Tom Markiewicz#14 of 15
Lum-PairMon @
z=3.5m
2cm radius
12.6cm radius
1cm radius
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Tom Markiewicz#15 of 15
IP Girder Mechanical Test Fixture