1. ESS CRYOMODULE RISKS REGISTER ESS CRYOMODULE COMPONENTS AND CAVITY EXPERTISE Franck PEAUGER14th January 2016

2. RISK REGISTER ESS CRYOMODULE COMPONENTS | PAGE 2

3. CAVITY EXPERTISE | PAGE 3 Transfert : ESS schedule will explicit limit of responsibilities and change instruction provisions (studies) Mitigation : involvement in Configuration Control Board + close follow-up of accounted hours CEA responsability is directly or undirectly engaged + demands from ESS partners exceed the allocated budget -> CEA support the impact (performance, cost)

4. COUPLERS | PAGE 4 No industrial company is qualified before the contract + Couplers prototype is qualified by separate parts then integrated and tested by CEA -> Pre-serie will not reach the expected performance during conditionning Analyze schedule impacts with different procurement scenario. Possible multisourcing (2 minimum). Keep the companies involved in prototypes in the business

5. RF TEST STAND FOR POWER COUPLER CONDITIONNING | PAGE 5 Commissioning of RF source may last 12 months to achieve full reliability (3 months commissioning planned) -> RF source lack of reliability at he start Prioritirize the RF source procurement + Prepare the installation in advance Couplers

6. COUPLER DOORKNOB | PAGE 6 Couplers doorknob definition is new and technically challenging: -> Couplers doorknob do not respect specifications or difficult to manufacture Test in Spring 2016 : no mitigation except what is foreseen (risk should be re- evaluated) RF trap Kapton insulation

7. CRYOSTAT COMPONENTS (GASKETS) | PAGE 7 CRYOSTAT COMPONENTS Aluminium material difficult to procure: -> Un-availability of Aluminium gaskets for assembly Procurement of material in advance and test other material

8. CRYOSTAT COMPONENTS (TUNER MOTORS) | PAGE 8 Tuner motor: only one provider (TSA) -> Un-availability of tuner motors for assembly Procure all the items (128) asap + proper storage conditions (packaging)

9. RISK REGISTER ESS CRYOMODULE COMPONENTS | PAGE 9 Before mitigationAfter mitigation Synthesis - Risk portfolio Criticity matrix +1 retention

10. Commissariat à l’énergie atomique et aux énergies alternatives Centre de Saclay | 91191 Gif-sur-Yvette Cedex T. +33 (0)1 69 08 xx xx | F. +33 (0)1 69 08 99 89 Etablissement public à caractère industriel et commercial | RCS Paris B 775 685 019 | PAGE 10 CEA Saclay/Irfu projet ESS | DATE