1. Changes to SiD since the DBD
T. Markiewicz, M. Oriunno/SLAC
LCWS 2015, Whistler CA

2. Summary of Changes Iron Yoke: QD0 quad starts at 4.1m from IP
Barrel-Door Iron Yoke Join at 30 degrees
was previously 0°
returns flux more efficiently
12 phi sectors rather than 8
smaller plates for transport & handling during assembly
Barrel support arches gone; door supports redesigned; new CMS-style plate-to-plate supports
QD0 quad starts at 4.1m from IP
was previously 3.5m
Response to “Change Request” from BDS & AD&I groups to have one common L* for SiD and ILD
Under Discussion:
10-plate yoke instead of baseline 11-plate yoke (flux return considerations)
Question: Is Muon Chamber Segmentation optimized? Can iron be further reduced?
Shape of beampipe through BeamCal
Remove Anti-DID coil from Solenoid
LCWS 2015

3. Nothing presented today is new.
Bibliography
Nothing presented today is new.
See:
Marco Oriunno: “SiD Iron Design”, ALCW 2015, KEK
Marco Oriunno: “SiD Engineering Updates”, 42nd SiD Optimization Mtg.
and
Tom Markiewicz: “SiD and L*”, ALCW 2015, KEK
LCWS 2015

4. Barrel-Door Partitions
0 deg
Baseline
45 deg
Heaviest Barrel
Lightest Doors
30 deg
Barrel < 4000 t
but will need 5kT gantry
15 deg
LCWS 2015

5. B Field – 11 plates, each 200mm thick
0° Baseline
15°
30°
45°
Red=5.1 Tesla; Blue=4.3Gauss: More efficient use of iron at 45°
Red=1kG; Blue=50 Gauss; Gray ends at 30m:
50G fringe field extends less
Lower field on surface of yoke where electronics will reside as interface goes from 0 to 45°
LCWS 2015

6. Bz- Outside Detector at z=0 – 11 plate yoke
LCWS 2015

7. 30° Interface leaves Barrel < 4000 tons (nb: Coil=180 ton & HCAL=417 ton & Feet=80 ton)
0° Baseline
15°
30°
45°
Barrel
00deg
15deg
30deg
45deg
Plate #
Radius (mm)
Length (mm)
Mass (tons) 1
3554
5900
208 2
3794
222
6396
241
6400 3
4034
236
256
6880
275 4
4274
250
271
292
7360
312 5
4514
264
286
308
7840
351 6
4754
278
324
347
8320
392 7
4994
341
364
8800
436 8
5234
306
357
407
9280
482 9
5474
320
399
426
9760
530 10
5714
334
417
471
10240
580 11
5954
348
434
491
10720
633
3059
3516
3810
4439
14.9%
24.5%
45.1%
Door
R In (mm)
R out (mm)
216
6054
181
3894 75
3654 66
4614
105
4134 84
5334
141
5094
128
4374 95
5574
154
4854
117
5814
167
1996
1773
1627
1314
-11.2%
-18.5%
-34.2%
LCWS 2015

8. New Iron Design – Higher Phi segmentation8x
12x
LCWS 2015

9. All Plates < 30T in 12 Sided Design
12 edges
8 edges
LCWS 2015

10. Feet Instead of Arches Edge-Edge Connectors in Phi to Handle Changing Plate Lengths
DBD Arches with Plates Joining Layers
Support Feet & Plates with Connectors
LCWS 2015

11. Connector Detail
LCWS 2015

12. CMS Used Similar Connectors CMS Used Ferris Wheel to Assemble Layer-by-Layer
LCWS 2015

13. Barrel Assembly Alternate Assembly Using CMS Ferris Wheel Tooling
LCWS 2015

14. Doors with New Supports and Interplate Connectors
LCWS 2015

15. Total Barrel with Coil, HCAL and Feet: Mass=4540 Tons
LCWS 2015

16. Total Door with HCAL, Feet & PACMAN
C.G.
Total Mass 2,312 tons
Center of Gravity
X = 0 mm
Y = -996 mm
Z = 1826 mm
LCWS 2015

17. 2D and Isometric Views of SiD
LCWS 2015

18. Door with Motion System
LCWS 2015

19. SiD on Push-Pull Platform
LCWS 2015

20. R<30cm Layout for DBD with QD0 at 3.5m & QF1 at 9.5m
Beampipe Spider Support
Movers
QF1 L*=9.5m
Valves/ Pumps
LumiCal
QD0 L*=3.5m
FB Kicker
W Mask
Beampipe
Bellows & Flange
FB BPM
QD0 Service Pipe
BeamCal
PolyCarbonate
QD0 Cryostat
QF1 Cryostat
ECAL
HCAL
Door Yoke
PACMAN
LCWS 2015

21. L* (of QD0) Change from 3.5m to 4.1m L* (of QF1) stays at 9.5m
With QF1 at 9.5m there is 115cm free space once you allow for:
Disconnect/Valve/Pumpout & RGA system is common to ILD/SiD and requires 56cm of length
55cm Kicker flange-to-flange length is 62.7cm
Still have 115cm-60cm=55cm free space after the changes
Need to use 60cm of the 115 for the QD0 shift and an extra 11cm for a new BPM:
Extraction and Input side BPMs are 11cm long and most be offset with respect to each other due to transverse space constraints
Move Beamcal as far from IP as possible (reduces background from pair backsplash)
Space between Lumical & Beamcal dead in current SID design
Expands from 107cm to 156cm ( )
Could be instrumented
Ion pumps could be placed here if needed
LCWS 2015

22. R<30cm Layout for DBD with QD0 at 4.1m & QF1 at 9.5m
Beampipe Spider Support
Movers
QF1 L*=9.5m
Valves/ Pumps
LumiCal
QD0 L*=4.1m
FB Kicker
W Mask
Beampipe
Bellows & Flange
QD0 Service Pipe
BPMs
BeamCal
PolyCarbonate
QD0 Cryostat
QF1 Cryostat
ECAL
HCAL
Door Yoke
PACMAN
LCWS 2015

23. Beamline Components from BeamCal to QD0 in 3.5m L*
Transition after Bellows
Beampipe in BeamCal
Feedback BPM
(2nd will need to be offset in z)
BeamCal-QD0 transition with Feedback BPM
W shield to absorb pairs
LCWS 2015

24. Backend Services Needed for Either L*
Four 1-1/2” Gate Valves
Support Tube
QD0 Service Line
QF1
Formed Bellows & Disconnect Flanges
Ion Pumps
63cm Assembly for 55cm Kicker
58cm Pump & Valve Assembly
LCWS 2015

25. New 4.1m Layout in 3D QD0 Kicker Support Tube BPM PolyC QD0 BeamCal
LCWS 2015

26. Beampipe support at the Lumical-Tracker interface
LCWS 2015

27. Isometric View
LCWS 2015

28. Under Discussion: 10 Plate Yoke – Seems Feasible Bz- Outside Detector at z=0
Treaty Point: 50 Gauss at 15m
LCWS 2015

29. Proposed BeamCal Beampipe
Proposed SiD BeamCal Beampipe
ILD BeamCal Beampipe
LCWS 2015

30. Do We Really Need a Anti-DID Coil Hits in the Plug Region
AntiDID OFF
15,10mm
AntiDID ON
15,10mm
AntiDID OFF
20,15mm
AntiDID ON
20,15mm
LCWS 2015

31. SBWO2_pairs0001.dat (2009 IP w/o TF) 174k particles, 409.2TeV
Where to the e+e- pairs go
15,20mm
No DID
AntiDID
# Hits
Energy
#Hits
Go out 4cm exit hole
32.1%
85.2%
87.9%
90.3%
Go out 3cm entrance
4.5%
0.8%
1.5%
0.7%
Hit the plug
54.6%
5.3%
3.0%
1.4%
Outside the plug in “physics” region
8.8%
8.7%
7.6%
7.7%
The Anti-DID really only helps the plug region between the beam pipes
The Anti-DID buys you 1% less energy in the region outside the plug and the 40mm/30mm exit/entrance apertures in the BeamCal silicon
LCWS 2015

32. Conclusions New iron yoke design more efficient at returning flux
Less field at yoke surface: good for electronics
Less field in far region where ILD lives
Smaller plates more convenient for
Truck delivery where roads rules require<60T loads
Assembly above ground: ton crane OK (now 200T)
Simpler cheaper supports
4.1m L* seems OK, but work needed:
Evaluate pair background with new layout & impact on SUSY physics
Redesign support tube and support tube movers for new layout and estimate static stresses when door open and closed
It appears that even with a reduction of 60cm between QD0 and QF1, the door can be opened by 2.8m.
The cantilevered load on the support tube with the door in the open position will be much larger. It is not at all clear that the current design of the support tube mover system will be adequate to limit beampipe deflection at the single convolution bellows in front of LumiCal.
Evaluate impact of support on vibration susceptibility
Answer the required vacuum question definitively
LCWS 2015