Transcript NLC - The Next Linear Collider Project IR Layout Tom Markiewicz SLAC LCWS Cornell 15 July 2003

NLC - The Next Linear Collider Project
IR Layout
Tom Markiewicz
SLAC
LCWS Cornell
15 July 2003
IR Layout Issues
• IR Hall Dimensions
• Detector Access Model
– Maintenance
– Component Replacement
• Final Doublet Support Scheme
• Tungsten Mask Design and Support
#2 of 15
Tom Markiewicz
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
62m
33m
#3 of 15
Tom Markiewicz
Current Large Detector Access Model
Endcap ECAL@ 3m
Pit Wall (14.8m)
6.7m
Door Support
(3.2m)
8
6
10.4m
4
2
0
0
2
4
6
8
10
12
14
16
18
20
-2
-4
-6
-8
#4 of 15
Permanent Support /
Moveable Shielding
Moveable Shielding
/ Moveable Support
Tom Markiewicz
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
#5 of 15
Tom Markiewicz
Current Final Quad Support Scheme:
Cantilever 40cm diameter Tube from
DOOR CLOSED Position
0.5
0.4
0.3
0.2
0.1
0
-0.1
Must remove (red)
platform and clamps
that anchor end of tube
to open door
-0.2
-0.3
-0.4
-0.5
0
#6 of 15
2
4
6
8
10
12
14
16
Point 2: Save 3.7m (-10.4-6.7) of extra cantilever but
limit access, or is there a better way?
18
20
Tom Markiewicz
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 beamline
Is 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?
#7 of 15
Tom Markiewicz
IP Masks 1996-2000: L*=2.0m
SD
0.4
0.3
0.2
0.1
0
0
2
4
6
8
10
12
2
4
6
8
10
12
-0.1
-0.2
-0.3
-0.4
LD
0.4
0.3
0.2
0.1
0
0
-0.1
-0.2
-0.3
-0.4
#8 of 15
Tom Markiewicz
IP Masks 2000-2001: L*=4.3m
LD
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
0
#9 of 15
2
4
6
8
10
12
Tom Markiewicz
IP Masks Snowmass 2001-2003: L*=3.8m
SD
#10 of 15
Tom Markiewicz
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
#11 of 15
Tom Markiewicz
LD Forward Masking, Calorimetry & Tracking 2003-06-01
0.5
101mrad
0.4
0.3
W
Inst.
Mask
0.2
W
0.1
Pair-LuMon
48mrad
QD0
0
LowZ Mask
BeamPipe
-0.1
Exit radius
2cm @ 3.5m
W
-0.2
W
-0.3
Support
Tube
E
C
A
L
-0.4
HCAL
-0.5
0
#12 of 15
0.5
1
1.5
2
2.5
3
3.5
4
Tom Markiewicz
SD Forward Masking, Calorimetry & Tracking 2003-06-01
0.5
113mrad
0.4
0.3
Inst.
Mask
0.2
W
W
0.1
Pair-LuMon
46mrad
QD0
0
LowZ Mask
BeamPipe
-0.1
Exit radius
2cm @ 3.5m
W
W
-0.2
Support
Tube
-0.3
E
C
A
L
-0.4
HCAL
YOKE
-0.5
0
#13 of 15
0.5
1
1.5
2
2.5
3
3.5
4
Tom Markiewicz
LumPairMon @
z=3.5m
1cm
radius
2cm
radius
12.6cm
radius
#14 of 15
Tom Markiewicz
IP Girder Mechanical Test Fixture
#15 of 15
Tom Markiewicz