SiD MDI Issues
Tom Markiewicz/SLAC
Beijing ACFA/GDE Meeting
05 February 2007
Issues : No Definite Solutions
Surface Assembly and Underground Halls
Space and Crane Requirements
Detector Access Model in Push-Pull Scheme
QD0 cryostat and support
Anti-Solenoid
Liquid Helium Supply
“R20” detector package- Support and Alignment Model
Beampipe and VXD
Forward Tracker
Lumical, Beamcal & Masks
Not Covered Today
Detector Shielding Model
DID &Solenoid Field
Calibration Scheme in Push-Pull
Background Simulations
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SiD Assembly Movie
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Sequence of Operations
•
Detector subassembly construction & surface tests
– Octants of muon chamber instrumented barrel yoke, barrel Hcal, barrel Ecal
– Four sub-modules of EC return flux instrumented with muon chambers, donut
Hcal, Ecal
– Tracker, vertex and FCAL packages
•
Surface Magnet test
– Assemble barrel support and the bottom 5/8 flux return octants
– Drop in coil & cover with remaining 3/8 octants
– Assemble two door legs and 4 360° (180 °?) plates of flux return
– Test magnet and disassemble
• Lower detector
– Reassemble lower barrel with supports below ground
– Load barrel HCAL and ECAL modules into coil cryostat via threaded
beam
– Lower loaded coil package and capture with upper barrel yoke
segments
– Depending on crane capacity
• Lower fully assembled door
• Lower door pieces, the last plate with the Endcap Ecal & Hcal, and
reassemble
• Tracker, VXD and FCAL installed below ground at last minute
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A Surface Assembly Scenario for SiD
M. Breidenbach -1 August 2006
M-Tons
Stainless HCAL Radiator
Tungten HCAL Radiator
Barrel
Endcap x2
Barrel
Endcap x2
EM Cal
59
19
59
19
HCAL
354
33
367
46
Coil
160
Iron
2966/8=
374.5
2130/4=
532.5
1785/8=
223.125
1284
150
110
90
65
Loaded
Coil=573
Assembled
Door=2402
Loaded
Coil=542
Assembled
Door=1479
8.3m
10.4+2.0m
Support x 2
116
(each ~5%Fe)
Total to
Lower
Shaft
Diameter(m)
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Pre-Push Pull, 20mrad crossing angle, L*=3.5m
Final Doublet Support and Access Plan
• One cryostat with radial step support tube with corresponding step
• Cryostat step @ z=4.8m: door can open 2m; radii from BNL
Theta
OD1
OD2
14 mrad
290mm
477mm
20mrad
305mm
512mm
• Tube cantilevered from removable base just behind closed end cap
door
• Full coverage endcap Ecal/Hcal @ r>20cm
• Forward instrumented steel return flux cut back ~10cm to clear step
in cryostat when door open
• Antisolenoid cryostat begins at r=30cm
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2006-05-07 BNL Discussion
0.5
70mm x 1.7m
AntiSolenoid Cryostat
0.4
Space to
Open Door
60cm OD
Support Tube
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
305 mm OD
38cm OD
Cryostat
Support Tube
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512 mm
OD
Cryostat
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16
SiD Final Doublet Support and Access Plan with
Push Pull @ 14mrad Crossing angle, L*=3.51m
• Three concepts
– Drop idea of cantilevered support tube
• QD cryostat and FCAL package supported off rails in
endcap doors
• Rails incorporate telescoping “rail extensions” to
support cryostat and FCAL when door is open
– Permanent liquid He feed line from barrel to
QD0 with loop large enough to allow 3m door
opening
– 5cm (?) radial cutback in endcap door iron to
allow it to pass over QF1 cryostat with
antisolenoid cryostat beginning at r=30cm
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Plan & Elevation View of FCAL/QD0 Support
QD0
Door
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FCAL/QD0 Supported with Door Open
FCAL
QD0
Rail
Extensions
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Door
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Cross Section of QD0 Cryostat at
z=3.5m
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SiD r<50cm, L*=3.5, 14mrad Crossing
Angle, Push-Pull, Door Closed
0.5
0.4
70mm x 1.7m
AntiSolenoid Cryostat
Space to
Open Door
10cm ColdWarm Xtns
30cm needed?
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
328 mm OD
Cryostat
Support Rails
-0.5
0
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477 mm OD
Cryostat
6
8
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12
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12
16
SiD r<50cm, L*=3.5, 14mrad Crossing
Angle, Push-Pull, Door Open
0.5
Liquid He Line
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
Inconsistency
between support
rail & cutout
-0.4
-0.5
0
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6
8
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13
16
Door Closed, Permanent QD0 Liquid He Line
8
6
4
Liquid He Line
2
0
-2
-4
-6
-8
0
1
2
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5
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8
9
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10
Door Open, Permanent QD0 Liquid He Line
8
6
4
Liquid He Line
2
0
-2
-4
-6
-8
0
1
2
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10
R20 Tracking, Beam Pipe and FCAL
Details Need Consistency Check
• In my personal view handshake between Tracker
people, VXD people, FCAL people, Recon people,
Management people and MDI people not made yet
• VXD cryostat now a CF support tube hanging from
Beam Pipe and in turn supporting VXD Barrel and 7
endcap layers
– Who supports beampipe?
• FCAL interplay with Forward tracking and Beampipe
not globally resolved
• Interference between forward tracker & FCal during
VXD access
• No conceptual solutions yet for Flanges, Bellows,
Alignment, Cable and Cold Gas Access
• All Good Topics for SiD April 9-11 Collab Mtg @
Fermilab
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SiD R20 As per SiD Detector Outline Document
0.5
0.4
0.3
0.2
0.1
0
-0.1
-0.2
-0.3
-0.4
-0.5
0
0.5
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1.5
2
SiD MDI
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3
3.5
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4
R-Z View of the Pixel VXD
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12mm Beam Pipe and VXD Detail
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SiD Open for Access to the VXD Region
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VXD and Support Structures
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Elevation & Plan Views of FarLumi/BeamCal
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