1. February 4, 2007 Global Design Effort 1

2. February 4, 07 Global Design Effort IR&MDI: 2 Contents Will describe design of Beam Delivery System, focusing in particular on Machine Detector Interface aspects –IR hall and surface buildings –Detector assembly –Machine background –Design of IR and detector –IR arrangements for two detectors

3. February 4, 07 Global Design Effort IR&MDI: 3 BDS layout

4. February 4, 07 Global Design Effort IR&MDI: 4 IR hall region

5. February 4, 07 Global Design Effort IR&MDI: 5 BDS beam-line layout 14mr IR FF E-collimator  -collim. Diagnostics Tune-up dump BSY Sacrificial collimators Extraction service tunnel Muon wall -2.2km 5m Polarimeter E-spectrometer

6. February 4, 07 Global Design Effort IR&MDI: 6 BDS optics Upstream polarimeter;  & E –collimation ; Energy spectrometers are of particular MDI interest IR linac

7. February 4, 07 Global Design Effort IR&MDI: 7 BDS parameters

8. February 4, 07 Global Design Effort IR&MDI: 8 CMS assembly approach: Assembled on the surface in parallel with underground work Allows pre-commissioning before lowering Lowering using dedicated heavy lifting equipment Potential for big time saving Reduces size of required underground hall On-surface assembly of ILC detectors CMS approach

9. February 4, 07 Global Design Effort IR&MDI: 9 ILC Underground schedule Earlier version of layout

10. February 4, 07 Global Design Effort IR&MDI: 10 On-surface assembly of ILC detectors Adopted CMS on-surface assembly approach for ILC detector –This allows saving more than two years and fitting into the goal of “7years until first beam” and “8years until physics run” CMS assembly and lowering the detectors parts in the hall is presently ongoing, according to the plan –Information and images on next pages are courtesy of CERN colleagues Alain Herve, Martin Gastal, et al.

11. February 4, 07 Global Design Effort IR&MDI: 11 CMS Assembly

12. February 4, 07 Global Design Effort IR&MDI: 12 CMS Assembly

13. February 4, 07 Global Design Effort IR&MDI: 13 CMS Assembly

14. February 4, 07 Global Design Effort IR&MDI: 14 CMS Assembly

15. February 4, 07 Global Design Effort IR&MDI: 15 CMS Assembly

16. February 4, 07 Global Design Effort IR&MDI: 16 CMS Assembly

17. February 4, 07 Global Design Effort IR&MDI: 17 CMS Assembly

18. February 4, 07 Global Design Effort IR&MDI: 18 CMS Assembly

19. February 4, 07 Global Design Effort IR&MDI: 19 CMS Assembly February 1. Lowering down a 1200 ton barrel ring. Photo and info courtesy Alain Herve

20. February 4, 07 Global Design Effort IR&MDI: 20 CMS Assembly CMS is at half process. Next -- lowering 2kt central barrel by the end of February. Alain Herve Lowering down a 1200 ton barrel ring

21. February 4, 07 Global Design Effort IR&MDI: 21 Optimization of IR hall and assembly procedure For RDR, discussing possible variations of assembly procedure –pure and modified CMS assembly (configs. A and B in the table on next slide) Difference being how large pieces are assembled on surface Present RDR does not intend to finalize all the details for the schedule, hall sizes, capacity of cranes, etc. Optimization will be done in details by BDS, CF&S and Detector concept groups in EDR phase

22. February 4, 07 Global Design Effort IR&MDI: 22 Table of IR assumptions continued …

23. February 4, 07 Global Design Effort IR&MDI: 23 … continued …

24. February 4, 07 Global Design Effort IR&MDI: 24 Included in IR hall and surface buildings: IR hall: –detectors hall of 120x25x39m –service cavern 40x15x10m –finished civil engineering works, plus –movable concrete shielding wall in two parts (on air pads) –steel platforms with staircases and all fittings –two 1.6t elevators between steel platforms plus two 2.8t in shafts, –steel plates on the floor of the Hall –one 400t and two 20t overhead cranes in Hall –etc… Included in surface assembly building: –two assembly buildings 100x25x25m –400t and 20t overhead cranes This choice can suite some detectors better than other (one size does not fit all) and may cause some concerns Further adjustments of IR hall and surface buildings will be done, in close connection with detector colleagues, during EDR phase

25. February 4, 07 Global Design Effort IR&MDI: 25 IR surface area

26. February 4, 07 Global Design Effort IR&MDI: 26 Next slides Will discuss –Machine background muons Synchrotron Radiation Beam-gas Extraction line losses –IR design Detector Integrated Dipole (DID) Antisolenoids

27. February 4, 07 Global Design Effort IR&MDI: 27 polarimeter skew correction / emittance diagnostic MPS coll betatron collimation fast sweepers tuneup dump septa fast kickers energy collimation beta match energy spectrometer final focus final doublet IP energy spectrometer polarimeter fast sweepers primary dump muon wall BDS layout & possible sources of muons clean-up collimators SP2SP4 SPEX

28. February 4, 07 Global Design Effort IR&MDI: 28 Muon flux in BDS & IR with and without 5m muon wall Allows reducing flux in TPC to a few  per ~100 bunches 5m wall N.Mokhov et al., FNAL Muon reduction

29. February 4, 07 Global Design Effort IR&MDI: 29 Muon walls 5m muon wall installed initially If muon background measured too high, the 5m wall can be lengthened to 18m and additional 9m wall installed (Local toroids could be used also) Purpose: –Personnel Protection: Limit dose rates in IR when beam sent to the tune-up beam dump –Physics: Reduce the muon background in the detectors

30. February 4, 07 Global Design Effort IR&MDI: 30 Beam gas & SR in IR Beam gas –is minimized by controlling the pressure near IP within 1nTorr level, 10nTorr in 200-800m from IP and ~50nTorr in the rest of the system SR in IR –due to upstream collimation is contained within a defined cone which is extracted away Example of SR rays from beam halo in IR apertures F.Jackson, et al

31. February 4, 07 Global Design Effort IR&MDI: 31 Extraction Lines optional high L parameters (500 GeV CM) Losses for the nominal case are negligible (~1W for 200m from IP) Even for High L parameters is within acceptable levels Small losses in extraction and separation from dump are important to keep the back-shine low nominal parameters (500 GeV CM) Y.Nosochkov, et al

32. February 4, 07 Global Design Effort IR&MDI: 32 Anti-DID coils -5 -3 -1 1 3 5m Two overlapping Detector Integrated Dipole coils create field flattened in the IR region Application of anti-DID to guide pairs to the exit hole B.Parker, et al, BNL

33. February 4, 07 Global Design Effort IR&MDI: 33 Antisolenoids Antisolenoids for local compensation of beam coupling Depend on all parameters (L*, field, sizes, etc) and is a delicate MDI issue SiD with L*=4.5m LDC with L*=4.5m B.Parker, BNL QD0 Example of optimal field for local compensation of coupling (SiD, L*=3.5m)

34. February 4, 07 Global Design Effort IR&MDI: 34 Arrangements for two detectors IR design Shielding Moving the detectors Services Opening Connections etc

35. February 4, 07 Global Design Effort IR&MDI: 35 IR conceptual design Move with detector Stay fixed Warm space for vacuum valves for disconnect Detector B.Parker, et al, BNL

36. February 4, 07 Global Design Effort IR&MDI: 36 Shield ON Shield OFF Intensity of color represent value of magnetic field. Active shielding demonstration IR magnet design Actively shielded QD0

37. February 4, 07 Global Design Effort IR&MDI: 37 Steel Yoke (no yoke for 4 th ) Solenoid HCal ECal TPC or Si Tracker Antisolenoid Low Z Mask Vertex Detector IP Chamber BeamCal FD Cryostats LumiCal Detectors Generic Detector - IR Details Working progress John Amann, et al

38. February 4, 07 Global Design Effort IR&MDI: 38 Vertex Detector IP Chamber LumiCal Detectors Beam Cal Warm Beam Pipes FD Cryostat Group 1 QD0 OC0 SD0 Valves for Push Pull QDEX1 Space for Feedback Kicker FD Cryostat Group 2 QFEX2 QF1 SF1 OC1 Mask Generic IR layout

39. February 4, 07 Global Design Effort IR&MDI: 39 IR forward region and chambers Watch in study & design: –integration; support; assembly; wake-fields and EMI; location of BPMs; vacuum & pumping; cold-warm transitions; etc.

40. February 4, 07 Global Design Effort IR&MDI: 40 250mSv/h Shielding the IR hall Self-shielding of GLD Shielding the “4 th “ with walls

41. February 4, 07 Global Design Effort IR&MDI: 41 Working progress on IR design… John Amann 3m Thickness 9m Base25m Height Structural Rib Overlapping Rib Illustration of ongoing work… Designs are tentative & evolving Mobile Shield Wall Mobile Platform 20m x 30m Electronics/Cryo Shack 1m Shielded

42. February 4, 07 Global Design Effort IR&MDI: 42 Beamline shielding Illustration of ongoing work… Designs are tentative & evolving John Amann Recessed Niche Pac Man Open Pac Man Closed Beam Line Support Here

43. February 4, 07 Global Design Effort IR&MDI: 43 Beamline shielding Looking into experience of existing machines… CMS shield opened pacman closed pacman opened SLD pacman closed door tunnel pacman opened

44. February 4, 07 Global Design Effort IR&MDI: 44 Air-pads at CMS Photo from the talk by Y.Sugimoto, http://ilcphys.kek.jp/meeting/lcdds/archives/2006-10-03/ http://ilcphys.kek.jp/meeting/lcdds/archives/2006-10-03/ Single air-pad capacity ~385tons Air-pads equipped with hydraulic jack for height adjustment & service Lift is ~8mm for 385t units Steel plates (~4cm) on the floor (compressed air 50bars) Inclination of ~1% of LHC hall floor is not a problem Last 10cm of motion on grease pads [Alain Herve, et al.] 14kton ILC detector would require ~36 such air-pads

45. February 4, 07 Global Design Effort IR&MDI: 45 Displacement, modeling Idealized models Short range deformation (~0.1mm) is very similar in both models. Long range (1/r) deformation (~0.3mm) is not seen in ANSYS because too thin slab in the model More details (3d shape of the hall, steel plates on the floor, etc.) to be included. Long term settlement, inelastic motion, etc., are to be considered. Parameters: M=14000 ton; R=0.75m (radius of air-pad); E=3e9 kg/m^2, n=0.15 (as for concrete); Number of air-pads=36 J.Amann, http://ilcagenda.cern.ch/conferenceDisplay.py?confId=1225 http://ilcagenda.cern.ch/conferenceDisplay.py?confId=1225 Analytic model, half-space ANSYS model

46. February 4, 07 Global Design Effort IR&MDI: 46 Hilman rollers is also a possibility For pre-determined path of motion for detector exchange, Hilman rollers may be suitable Standard capacity to 1kton While not standard items, the 5kton capacity rollers have been manufactured Durability is important and to be studied Contact Roll Roller Chain Links 5000 ton module will have 51 contact rolls in 3 rows of 17

47. February 4, 07 Global Design Effort IR&MDI: 47 Other considerations Hydraulic jacks for adjustment Drive systems Guiding mechanism Alignment, etc Hydraulic Jacks/Shims Screw type drive system

48. February 4, 07 Global Design Effort IR&MDI: 48 Detector support Detector may have a supporting platform –size of IR hall increased to allow for this

49. February 4, 07 Global Design Effort IR&MDI: 49 detector B may be accessible during run accessible during run Platform for electronic and services (~10*8*8m). Shielded (~0.5m of concrete) from five sides. Moves with detector. Also provide vibration isolation. Concept of IR hall with two detectors The concept is evolving and details being worked out detector A

50. February 4, 07 Global Design Effort IR&MDI: 50 Concept of detector connections fixed connections long flexible connections detector detector service platform or mounted on detector high V AC high P room T He supply & return chilled water for electronics low V DC for electronics 4K LHe for solenoids 2K LHe for FD high I DC for solenoids high I DC for FD gas for TPC fiber data I/O electronics I/O low V PS high I PS electronic racks 4K cryo-system 2K cryo-system gas system sub-detectors solenoid antisolenoid FD move together

51. February 4, 07 Global Design Effort IR&MDI: 51 QD0 partQF1 part door central part Need to be optimized for fast switch of detectors in push-pull and fast opening on beamline This scheme may require lengthening L* to 4.5m and increase of the inner FD drift Opening of detectors on the beamline (for quick fixes) may need to be limited to a smaller opening (MDI negotiation issue!) than what could be done in off-beamline position Concept of cryo configuration

52. February 4, 07 Global Design Effort IR&MDI: 52 Finishing up… Machine Detector Interface issues which require careful balance of very different constrains from Detectors and Machine –IR design, FD, support, connections, alignment –Detector design, opening, movements –Backgrounds, machine and beam related –Conventional facilities –Stability –Services –Radiation safety –etc

53. February 4, 07 Global Design Effort IR&MDI: 53 Summary Interaction Region is a machine area where balance of design constraint from many groups is especially important The Beam Delivery Design group is looking forward to work on IR design together with Detector colleagues in the EDR phase of ILC

54. February 4, 07 Global Design Effort IR&MDI: 54 Thanks BDS design team MDI panel Detector colleagues Push-Pull evaluation task-force Colleagues from LHC, CERN All colleagues involved in BDS & MDI work