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Status JRA-SRF

Status JRA-SRF. List of submitted deliverable reports Report on continuing activities WP 2, WP 4 Status of remaining deliverables Highlights Approaching the end of JRA-SRF Annual meeting 2008 Final reports. Status WP2.2 Improved component design.

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Status JRA-SRF

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  1. Status JRA-SRF • List of submitted deliverable reports • Report on continuing activities • WP 2, WP 4 • Status of remaining deliverables • Highlights • Approaching the end of JRA-SRF • Annual meeting 2008 • Final reports

  2. Status WP2.2 Improved component design • First cavity prototype with bellows in the middle of the He tank finished and successful tested (tuner WP 8.1) • Design of an improved end group finished • Construction contract placed to ZANON for two new end groups (end of July) • Mechanical test of new end group starts end of October

  3. 5 mm NbTi end dish. Stiffness is about 28 kN/mm for each end dish. 7 mm NbTi end dish. Stiffness is about 38 kN/mm Stresses (MPa) are calculated for 2 bar pressure difference. Curved NbTi end dish. Stiffness is about 69 kN/mm

  4. WP 4 Vacuum arc coating • Detailed studies on samples to improve the adhesion • Treatment with 15% citric acid solution • Profilometer measurements • High pressure water tests • Successful recipe for samples • But no success with cavity coating • Still peeling off after high pressure water cleaning • Analysis of x-ray diffraction measurements (DORIS) indicate the presence of two distinguished niobium phases. • Still mechanical problems with cavity shape

  5. Linear Arc coating

  6. WP 4.2.3 Report on Deposition HTC Material by UHV Cathodic Arc • Several films have been deposited using a niobium cathode in a nitrogen atmosphere. • The nitrogen pressure, arc current and voltage bias were varied in order to obtain nitride films with good superconducting properties. • Despite the effort the maximum Tc obtained was ~15K with a large transition width. • The films were not uniform and presented on the surface aggregates of irregular shape formed in flight. • Conclusion: • Due to the extreme criticality of parameters it was concluded that it would be very difficult to obtain the desired nitride cubic phase everywhere on a cavity cell complex geometry surface.

  7. Report on Deposition HTc Material by UHV Cathodic Arc Figure 3 -Transition to the superconducting state of one of the first UHV arc deposited NbN samples. Tc about 15K, ∆Tc ~5K, Fig.6 – Peeling on the anode in the cathodic region

  8. INFN Legnaro: finished 9-cell cavity by spinning

  9. Status seamless cavity by hydroforming • Finished since some time • Waiting in cue with many TTF cavities for cold test, now ready for cold test

  10. Summary status JRA-SRF • There is no real show stopper • Basically all work is finished • Prototypes are fabricated, but not all are measured; is beyond the scope of deliverable • High risk tasks have been clearly identified in the Annex1 • Deliverable is de-scoped, some activities continue • Summary report in preparation

  11. HIGHLIGHT 1 Seamless 9-cell cavity by hydroforming Aktenzeichen PCT/EP 2008/006577 beim Europäischen Patentamt in München

  12. HIGHLIGHT 2 PhD on best EP ParametersElectropolishing without HF

  13. JRA-SRF Annual Meeting 08 • Not during Annual CARE Meeting at CERN, program is too crowded • Scheduled for November 08 as Video conference • We need guidelines for the final report ASAP • Draft should be finished until our annual meeting

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