Status of DISCORAP activities. P.Fabbricatore TDR, Review, Actions taken, Planning

1. AGENDA • Status of DISCORAP activities. P.Fabbricatore • TDR, Review, Actions taken, Planning • 2) Mechanics (changes with respect TDR). S.Farinon • 3) Conductor last developments. G.Volpini • 4) Modifications to end coils. M.Sorbi • 5) Cryostat. From design to procurement. U.Gambardella • 6) Magnet instrumentation. P.Fabbricatore + all • 7) Magnetic measurements P.Fabbricatore

2. GENERAL STATUS OF DISCORAP ACTIVITIES • P.Fabbricatore • Conclusionsofactivitiesleadingto the TDR • Design Review • Actionstaken • Present status ofcoilconstruction • Planning

3. Synopsis Review in view of the Model Construction. Process to be ended by Dec.08 Review in view of the Prototypes Construction

4. A significant achievement: two curved poles manufactured using innovative tooling

5. Technical Design Report and Review A Draft of the Technical Design Report was produced and issued on end of October 2008. The document was sent to a Review Board (L.Rossi, L. Bottura, S.Caspi, A.Drevred and D.Tommasini) , which met on Nov. 12&13 in Genova for a Technical Review meeting. The Review Board made comments and gave advices, which were taken into consideration causing some modifications of the design. A final version of the TDR is ongoing. The construction of the model magnet is started and the procurement of materials and components started.

6. Charge to the Review Committee

9. Contribution to ac losses (ramping) 34 W (8.7 W/m) We could have higher losses 56 W (14.3 W/m) Considering also that the conductor procurement is on schedule (see Volpini ‘s presentation) , we think it is not a good policy to release now the specifications on conductor

11. Action: Kapton protection sheath replaced by stainless steel sheath Eddy currents 2D. If sheaths magnetically coupled W=0.650 W/m (Collars could couple them) If decoupled W= 84 mW/m Sheaths will be covered by a Teflon layer to avoid major magnetic coupling

12. We think that a vertical assembly can be faced in much more safe and controlled way than a horizontal assembly. Regarding the two possibilities… The configuration on the left is of simpler realization (also same coupling surfaces for lower and upper poles)

13. The basic assembly scenario for a curved yoke to be coupled with a curved collared coil implies that half yoke is coupled with the other half. • The 1 m Half Yokes are Transferred to an Assembly Bench and Aligned on a 66.67 m Curved Reference • During Assembly, Four Insulated Stainless Steel Tie Rods are Inserted in the Half Yokes • Tie Rods are then Tightened • Using an Horizontal Press, 1 m Long Half Yoke Laminations are Stacked on a 66.67 m Curved Reference Profile and then Pressed to nominal Stacking Factor. • 5 mm Thick Flanges Obtained by Glued Laminations are Used as End Flanges. • During Laminations Stacking four Stainless Steel Curved Pipes are Inserted inside Half Yoke • Once Obtained the Nominal Stacking Factor and Ends planarity/perpendicularity the Pipes Ends are Deformed to Lock the Half Yoke in Position In our opinion an alternative layout is not viable for a curve magnet!! (E.g. close the iron in the same way of collars)

14. Action : Keep the present layout, but, try to close the yoke as possible at room temperature and adopt a more robust clamping system involving stainless steel (rather than Al alloy). See. S. Farinon presentation

15. A not balanced gap (0.2 mm B=1.5 T in the figure) in the midplane, can cause asymmetric magnetic flux. But the field quality is unaffected. In the updated design the gap has been minimised.

16. Actions: 1) A stiffening bar welded to the iron in the pole region 2) The clamps are welded to a baking strip, which is welded togheter the two half of the external shell

17. Action: The external shell is done starting from a tick (10 mm) tube, bent and cut into two halves.

18. Action taken: The cryostat design was revised (See. Umberto Gambardella presentation). Regarding instrumentation, the point shall be discussed today.

19. No action taken. The assembly test would be of extremely interest because we could maximize the chances of success. In fact this test require extra-funding (around 300 k€) for materials and manpower, not available. FAIR , under D. Kreamer request, expressed the willing to support this assembly test, but no money is available now.

20. Planning (1)

21. Planning (2)

22. Contract with ASG Superconductor for the cold mass manufacture Main components under procurement: coil wedges, end spacers (modified as shown by M.Sorbi), iron lamination, insulation materials, outer shell,….). A very critic procurement for the high strength austenitic steel!!! Tooling modification is in progress. We should be able to manufacture the cold mass within this year. The beam pipe and the re-cooling pipe order is in progress (direct order of INFN Genova)

23. The quest for the high strength austenitic steel We need 2.5 ton a high strength austenitic steel YS= 650-700 MPa @RT, m=1.002 After several iterations with companies and labs CERN has in stock about 134 ton of YUS130. They need all and have very small margins Nippon steel sales YUS130 in minimum amount of 60 ton Kawasaki steel sales a high manganese steel in minimum amount of 150 ton Allegheny Ludlum sales Nitronic 40 in minimum amount of 34 ton ASG found one vendor providing 2.5 t Nitronic 40 in annealed status (YS 410 Mpa @RT) ASG is in contact with Buderus for a manganese steel which could be suitable for us (at least for this model coil) BNL are looking for similar material, but they will order on October this year.

25. Beam pipe The material is AISI316 LN seamless

26. Re-cooling pipe The material is AISI316 L OD 70 mm. Fully curved. Modification required for the non-magnetic steel lamination at coil ends Larger hole