1. Muon Decay Ring Norbert Collomb STFC Technology 8 th December 2011

2. 1.Start with Lattice deck MADX translated into Excel Identify systems and corresponding locations Summarise into a configuration document/schematic Use to create basic 2D sketch Interpret into more detailed 3D layout 2.Interpreting requirements Clarify systems – determines size Introduce systems not catered for in lattice, i.e. vacuum Sketch update with additional detail, clash analysis 3.Closed Loop process Feed info back to lattice designer Costing

3. 25 GeV Muon Decay Ring Schematic Septum (4m) Kicker (10m) SeptumKicker 1m alternating QF - QD Magnets 2m Dipole Magnet Oval Vacuum chamber 111 x 167mm, 2mm wall thickness 0.7m Drift ARC CELL GIRDER ASSEMBLY (58 off): LONG STRAIGHT 600.2m Matching Section 36.1m ARC Section 132m Circumference: 1608.8m (2x600.2 + 2x132 + 4x36.1) Magnets:Defocusing Quad (Arc) Focusing Quad (Arc) Dipole (Arc) Focusing Quad (LS) Defocusing Quad (LS) Dipole (MS) Focusing Quad (MS) Dipole (MS) De/Focusing Quad (MS) Defocusing Quad (MS) Dipole (MS) Magnet Cryogenic Modules Field/Gradient:-23.7724.18-4.270.464-0.4640.354.1-1.911.6-9.2-0.64Arc: 58 double + 4 single Type:SC NC SC NCMS: 20 various single QTY:60 48 44484482 1m QD Magnet 2m Dipole Magnet 1m QF Magnet Power and Cryogenic Cell proposal (15 per Arc): 2.4m Dipole Magnet 0.8m QF Magnet 0.6m Dipole Magnet 1.6m QD Magnet 1.6m QF Magnet 0.8m Dipole Magnet 4m Dipole Magnet

4. 1.5m QF Magnet 4m Septum Magnet 10m Kicker Magnet 3m QD Magnet 3m QF Magnet 25 GeV Muon Decay Ring Schematic Septum (4m) Kicker (10m) LONG STRAIGHT 600.2m Matching Section 36.1m ARC Section 132m Circumference: 1608.8m (2x600.2 + 2x132 + 4x36.1) 3m QD Magnet 3m QF Magnet The rf cavities, tune control and collimation depicted in the IDS – IDR (Fig. 67) were never designed in detail. In the original design it was assumed those systems would be located in the "spare" production straight (i.e. the straight not sending neutrinos to a detector). If we want to populate the ring with both muon signs at the same time there will be no spare production straight so if those systems are needed they will need to be in the arc. RF is not needed in the scenario of single muon sign injection but may be needed if we inject both signs at the same time. The above is based on the latest lattice information and assumes both muon signs are injected. 10m Kicker Magnet 0.087T Dipole Field Circular Vacuum chamber ∅ 316mm, 2mm wall thickness 10.9875m Drift 16.9875m Drift SEPTUM - KICKER SECTION : (Quadrupole not shown for clarity) 4m Septum Magnet -1.27T Field 0.9875m Drift Vertical, Horizontal, Compound Angle Injection? Muon Decay Ring 1 at 18 degree and Muon Decay Ring 2 at 36 degree inclination.

5. Reference and progress Have made start on populating spreadsheet with details to get initial cost (warm section almost complete – controls and diagnostics outstanding). Power Supply and cooling requirement included –> floor space requirement -> tunnel/cavern sizing and location. Electrical info estimated based on data available (Cable Data, string powered, power consumption, tunnel heat load, etc). All info interpreted from ILC costing work package.

6. Challenges Need to transport modules from access shaft to location. Installation is “simple” as it can be carried out in series. Replacement modules need different transport system and tunnel layout (maybe). Size of modules drives access shaft and associated cost. Legislation needs to be adhered to (Fire, He, etc).

7. Solutions - Overview MDR Long Straight First Arc Second Arc Simple 3D CAD sketch Ring in horizontal plane Starting with a ‘skeleton’ and putting more meat on the bone as information becomes known Lattice info needs to be revised – contains insufficient data currently and inaccuracies

8. Solutions - Overview Matching Section First Arc Simple 3D CAD sketch Ring in horizontal plane Using lattice to create first 3D sketch to provide visual idea of layout. Crude placeholders used to represent systems. Permits further suggestions to be developed with regards to tunnel layout. Allows placing of spatial requirements for electrical equipment, cooling, controls, i.e. racks.

9. Solutions - Overview Internal Diameter 8.7m access shaft (450m deep sketch) Caverns 20m long x10m wide x 10m vaulted height Ring shown with 36° inclination Internal Diameter 8.7m access shaft (50m deep sketch) Access Tunnels either side internal diameter 4.5m Must be able to lower pre- assembled systems (complete girder, 3m long) Access shafts need to accommodate cabling, cooling, Health and Safety, etc. systems. Caverns need to house cryogenics, controls, racks and other auxiliaries. Access shafts need to be off- set from cavern (not as shown). Same diameter access tunnels as beam tunnel (not shown for clarity).

10. Solutions,……..one of many HVAC, He extraction* Personnel enclosure Maintenance Access 36 degree inclination Steps: 200mm Rise, 345mm Go 1.5m Quad representation Crane, Funicular, Transport on ceiling? 4.5m Internal Diameter Towards centre of racetrack * Not required for long straight sections

11. Discussion There are many details still unknown and currently a reference to similar systems is used to establish a possible solution. Legislative advice on Safety (number of alcoves, Emergency egress, extraction, etc.) required Surface Buildings (Cooling Towers, Power Station and Cryogenics Plant?). Heating – Ventilation – Air Conditioning (HVAC). Survey and Alignment. Lighting, Water and Cabling. Inclination is 36 degree for far detector, transport (people and equipment).

12. End of presentation Thank you for your attention. Questions?

13. Costing – general approach Once we know what we need – who provides info and when? Project manager: Garth Fader Magnet System John Smith Charlie Brown Sue Sonso Tom CatJerry Mouse Luke Groundwalker Barry Whyte CoilsAug‘12 SteelSept ‘12 CoolingJuly ‘12 ModellingMay ’12 ElectricalJune ‘12 ControlsJune ‘12 SupportAug ‘12 MoverOctober ‘12 Responsibility Assignment Matrix (could use RACI)

14. MUON Acceleration Technology & Building Concepts Neil Bliss, STFC Technology, Daresbury Laboratory K. Middleman, A. Moss, S. Pattalawar, STFC ASTeC

15. Revised 25 GeV FFAG Parameters Revised FFAG Lattice Designs for the IDS Neutrino Factory, 5 April 2011, document 090721-110405.pdf FDF Triplet Long drift 5m Short drift 0.75m Short drift has been increased to accommodate overlapping magnet yoke end plates and some additional space for a BPM between D and F magnets Updated lattice also provides symmetry for the beams. For Symmetry an odd number of cells is needed, since we have a odd number of cells at injection – see layout on next slide

16. 25 GeV Muon FFAG Layout Schematic Circumference 699 m ~ 222.21 m Extraction µ- Extraction µ+Injection µ+ Injection µ- SC Septum Kicker SC Septum Kicker SC Septum SC Magnet Modules 67 Straights Sections SC Cavities (2 cells per cavity) 50 Injection kickers 2 Injection SC septums 2 Extraction kickers 4 Extraction SC septums 2 Empty straights 7 Cell (Next Slide) Sector 1 Sector 2 Sector 3 Sector 4 Sector 5 Sector 6 Sector 7 Sector 8 Diagnostics BPM 134 Beam profile 12 Vacuum Vacuum sectors8 Valves 9 Ion pumps 40 Pirani gauge8 IMG gauge8 RGA8 Pumping valves8

17. FFAG Cell Layout Schematic (with warm sections) D MagnetF Magnet Cavity RF Input Coupler Cryostat Insulating vacuum chamber 4K He Chamber Thermal shield (40 – 60K) Location for BPM Warm Section or long strings ? Location for beam screen, vacuum equipment Thermal transition 4K - 293K Beam vacuum chamber 2.5K He Pipes

18. FFAG Cell CAD Model (with warm sections) Magnets and Cavities in separate cryostats F F D Cavity

19. Cryostat End Transition to a Warm Section 4K 40K 293K Bellows to account for thermal expansion Edge welded bellows to provide thermal barrier between regions of differing temperatures PAMELA Cryostat

20. Cryostat Design Options Options A. Many individual cryostats (CEBAF, SNS) B. Long strings combining many modules, typically 100m+ in length. Welded assemblies in-situ. Bellows welded in or bolted at module intersections. Option A Advantages – If you have a problem an individual cryostat can be removed and repaired, relatively quickly with a spare module. – But, It’s a high cost option. – There are many more joints and feedthroughs to go wrong and more chance of component failures. Option B Advantages 1.No external cryogenic transfer lines 2.No warm to cold transition (reduced heat load ) 3.Improved cryo-stability 4.Less cryo- instrumentation >>> easy and reliable cryogenic control 5.No vacuum valves between modules 6.And many more with significant reduction in cost Option B is the design approach has already been successfully demonstrated on XFEL (144 m long string of 12 cryomodules) based on FLASH experience. LHC, ILC, Project X,... have also adopted similar approach – BUT, if you get a failure its very serous. Difficult to find a problem. A long time to fix it.

21. Linac & RLA Modules Are the cryostats separate or long strings ? Is there enough space between them ? If not enough space then impact on physics design and building costs ! Study IIb images Intersection

22. Cryogenics Various subsystems for NF will require cryogenic refrigeration power at several different temperatures ranging from 1.9 K to 60 K Design study II has estimated an Total Equivalent Load (cooling power) at 80 KW (105 KW with 30% contingency) at 4.5K. Update is needed for costing Changes in the design or numbers of cryomodules is not likely to have a major impact on the demand for overall refrigeration Experience with LHC and other large installations indicate that large capacity refrigerators are relatively economical in terms of capital and operation costs with improved reliability. Using the design approach taken form LHC, all the necessary power can be obtained from 4 large refrigerators with an equivalent cooling powers of approximately 20 kW. CEBAF uses a single large plant (largest in the world) to provide refrigeration power of 4.8 kW at 2.1K (exceeding an equivalent capacity 40 kW at 4.5 K) Refrigeration at T>= 4.5 K will be provided by these large refrigerators Refrigeration at T< 4.5 K may be created locally within individual cryomodule using sub- atmospheric systems consisting of with JT valve and heat exchangers. Cryogenic distribution will be highly dependent on the design of individual cryostats and their interconnections.

23. Triplet Magnet Design (IDR report) Half of the F magnet Design based on LHC “cos θ” geometry Iron yoke 2 conductor blocks 3 conductor blocks

24. Magnet Design Options 3 Options IDR described magnet 2 layer Combined function double helix with many layers JParc 30 - 50 GeV neutrino beam line combined function magnet - Toru Ogitsu

25. Timescales and Costs for SC modules For the 28 superconducting combined function magnets for the KEK Neutrino beamline R&D design, construction & test of a prototype module ~2.5 years program (Cost ?) Production manufacture ~3.5 years (Cost ?) Total ~6 year program For NF muon acceleration and storage – Linac modules (3 types) – FFAG module – Storage arc module Even longer timescales for SCRF Linac modules Do we include prototyping costs in the overall costing ? or separate costs for numerous items for a prototype phase.

26. Next Steps and Timeline Progress technology solutions, concepts and decisions or “decisions/assumptions appropriate for the costing” Develop cost models based on the technology choices with assumptions and sufficient engineering detail Request more engineering effort to do that or do the best with what we have There is huge amount of work to do Timescales – Dec 2011 Costing Workshop @ CERN – June 2012 2 nd pass costing – April 2013 3 rd pass costing – Summer - Autumn 2013 Reference Design Report

27. Thank you for your attention