1. Accelerator/ Medium Beta Cavities Paolo Michelato INFN Milano - LASA www.europeanspallationsource.se April 21, 2015

2. Medium Beta Cavities Overview ESS medium beta cavities requirements INFN - LASA past experience on SC cavities INFN - LASA man power INFN prototyping on medium / high beta cavities INFN major procurement: 36 medium beta cavities 2

3. Schedule Show P6 schedule of the relevant activities for this sub-system 3

4. Medium Beta Cavities Technical performances 4 INFN Medium Beta Cavities Technical Performances RequirementsMedium beta Frequency (MHz)704.42 Geometric beta0.67 Nominal Accelerating Gradient (MV/m)16.7 Epk (MV/m)< 50 Cell coupling k(%)≥ 1.5 RF peak power (kW)1100 Q ext7.5 10 5 Q0 at nominal gradient> 5 10 9

5. Medium Beta Cavities Selected technologies 5 INFN – LASA experience on SC cavities – SNS cavities – TRASCO cavities – PDS-XADS cavities – EUROTRANS / MAX Elliptical test cryomodule – TTF/Tesla & FLASH cavities and modules – European XFEL series production of 400 1.3 GHz cavities – European XFEL 3.9 GHz system

6. Medium Beta Cavities Selected technologies /2 6

7. Medium Beta Cavities Selected technologies /3 7

8. Medium Beta Cavities Selected technologies /4 8

9. Medium Beta Cavities Integration and Verification 9 Cavities will be fabricated using INFN design and will be plug compatible with CEA boundary conditions. INFN design is relative to the cavity itself. Cavity interfaces, He tank geometry, flanges, tuner connections, etc will be done on the basis of the French design.

10. Medium beta Cavities Organization at partner lab The activity relative to the Medium Beta Cavities will be covered, according to our proposal, within the estimated man power of 15 FTE. 10

11. Budget and cost-book (1 slide) 11

12. Medium beta cavities Major Procurements /1 Medium beta and high beta cavities prototypes – Procurement contract NOT included in the proposal. Built prototypes of both medium and high beta cavities. – INFN design, using LG Nb, plug compatible with ESS cryomodule. Design process in progress. – Optimization to include LG option. LG Nb ingots procurement started. – Slicing process ordered. Full treatment (BCP, HPR, clean room) done in industry. Final handling and test will be done at LASA in the qualified infrastructure. 12

13. Medium beta cavities Major Procurements /2 INFN Plug - compatible design just started (but well in progress) 13

14. Medium beta cavities Major Procurements /3 INFN Plug - compatible design just started (but well in progress) 14 Inner cell parameters

15. Medium Beta Cavities Major Procurements /4 Medium beta series cavities – Niobium procurement for the fabrication of 36 medium beta cavities. – Cavity fabrication of 36 (*) medium beta cavities in the industry, including treatments, tuning, Helium tank integration, etc, accomplishing the ESS requirements in terms of performances, functional interfaces. – Certification activities, documentation, ancillaries (flanges, vacuum valves, antennas, frames, etc.) – Cold test in a qualified infrastructure. – Transportation in special boxes and delivery at the cryomodule assembling facility. – Man power for the above activities. (*) INFN Design, plug compatible with CEA boundary condition 15

16. Medium Beta Cavities Major Procurements /5 16 Revised scheduling proposed First 4 series cavities delivered by end 2017

17. Medium Beta Cavities Top risks Top risks – Availability of qualified companies at the time of the contract placement – Modification of the boundary conditions for cavities during the future development of activities 17

18. Next Six Months Design of medium beta cavities plug compatible with CEA boundary conditions LG Nb ingot arrival at LASA LG Nb ingot slicing (wire cutting) Medium beta prototype ordering Deep drawing of cells Activities for the technological transfer of the cavity processing (BCP) to the industry Vertical test adaptation for 700 MHz cavities 18

19. Medium Beta Cavities Summary INFN Milano – LASA activity on medium beta cavities started INFN design plug compatible with CEA boundary conditions First step: LG Medium beta and High beta cavities prototyping and testing Medium beta series production (36 cavities) start by end 2016 First 4 series cavities delivered by end 2017 19