Changes to SiD since the DBD T. Markiewicz, M. Oriunno/SLAC LCWS 2015, Whistler CA 2015-11-04

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

Nothing presented today is new. Bibliography Nothing presented today is new. See: Marco Oriunno: “SiD Iron Design”, ALCW 2015, KEK https://agenda.linearcollider.org/event/6557/session/2/contribution/92/material/slides/0.pptx Marco Oriunno: “SiD Engineering Updates”, 42nd SiD Optimization Mtg. https://agenda.linearcollider.org/event/6836/contribution/0/material/slides/0.pptx and Tom Markiewicz: “SiD and L*”, ALCW 2015, KEK https://agenda.linearcollider.org/event/6557/session/7/contribution/63/material/slides/0.pptx LCWS 2015

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

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

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

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

New Iron Design – Higher Phi segmentation 8x 12x LCWS 2015

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

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

Connector Detail LCWS 2015

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

Barrel Assembly Alternate Assembly Using CMS Ferris Wheel Tooling LCWS 2015

Doors with New Supports and Interplate Connectors LCWS 2015

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

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

2D and Isometric Views of SiD LCWS 2015

Door with Motion System LCWS 2015

SiD on Push-Pull Platform LCWS 2015

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

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 (107+60-11) Could be instrumented Ion pumps could be placed here if needed LCWS 2015

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

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

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

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

Beampipe support at the Lumical-Tracker interface LCWS 2015

Isometric View LCWS 2015

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

Proposed BeamCal Beampipe Proposed SiD BeamCal Beampipe ILD BeamCal Beampipe LCWS 2015

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

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

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: 40-50 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