1. WP 12.3 Moderator & Reflector Systems D. Lyngh, M. Kickulies, J. Ringnér, J. Jurns, Y. Bessler (FZJ), M. Klaus (TUD), H. Quack (TUD) TAC12 Presenters: Daniel Lyngh, Work Package Lead Engineer ESS Jesper Ringnér, Work Unit Lead Engineer ESS Yannick Bessler, IKC Project Manager FZJ

2. Outline Project Highlights – Recent Progress – Schedule (PDR & CDR) – TAC recommendations TIK 3.1 Moderator & Reflector Components – Introduction of In-Kind Partner Forschungszentrum Juelich – Cold & Thermal Moderator Design & Manufacturing – Beryllium alternative Concept – Twister Design Developments TIK 3.2 & 3.3 Cryogenics Systems – Systems Overview 2

3. Recent Progress In-Kind Contribution from Forschungszentrum Juelich – Agreement coming into place – IKC work initiated Moderator & Reflector Plugs (MR Plugs) – Preliminary Design Reviews Performed June -15 Cryogenic Cooling System – Preliminary Design Reviews Performed June -15 – Helium Cryoplant RFQ issued in Sept-15, due Dec-15 3

4. Schedule MR Plugs Cold Moderators Thermal Moderators Reflectors Handling System Structure & Shielding Liquid Hydrogen System Concept Phase Final DesignMake Phase PDRPDR PDRPDR PDRPDR PDRPDR 2019 Q1 Q2 2015 Q1 Q2 Q3 Q4 2016 Q1 Q2 Q3 Q4 2017 Q1 Q2 Q3 Q4 2018 Q1 Q2 Q3 Q4 PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR SAT PDRPDR PDRPDR Cryogenic Cooling System He Cryoplant PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR PDRPDR DeliveryCDR PDRPDR PDRPDR PDR PDRPDR PDRPDR PDRPDR PDRPDR Site Inst. & Testing Site Work 2014 Q3 Q4

5. TAC 11 Recommendations Twister Bearings 5 Recommendation: A simple version of the Twister concept is a reasonable approach. Failure-mode studies for the bearings should be continued (beam losses at the proton beam feed-through need to be carefully studied) Response: Failure mode analysis has been initiated and will be completed in the next few months. Several design improvements have been made to reduce the risk and consequence for a rotation problem. An analysis comparing the force needed to break a cold-welded roller bearing versus a cold-welded sliding bearing has been uploaded to the TAC-12 Indico site. Further studies needed that will be part of detail design: Complete analysis of all identified failure modes, some should be done in cooperation with remote handling group. For example: -Rotation tool failures -Issues lifting the target wheel -Issues lifting the plugs -Issues due to failures of surrounding shielding blocks Collecting further information and experience to make judgment of material combinations and designs that could reduce the risk and effect of the issue.

6. TAC 11 Recommendations Twister Bearings Number of bearings reduced (4- >2)(due to reduced number of shafts) Increased distance from bearings to hot spot and proton beam aperture Split plug as redundancy (top/bottom) remains so far Bearings of coated metal or ceramic hybrid with respect to radiation, cold welding, no lubricant and static load Calculation of forces to break a stuck roller bearing 6 Bearing 1 Bearing 2 Hot Spot TAC11 TAC12

7. TAC11 Recommendations Cryogenic System Recommendation: The TAC would like to see a presentation on the design of the cryogenic system at the next meeting. Response: Information on the design of the liquid hydrogen and helium cryoplant systems will be provided in the TAC- 12 meeting as part of the Moderator and Reflector Systems presentation. 7