Progress Report on Magnet R&D and Further Plans for CERN-KEK Collaboration

1. Progress Report on Magnet R&D and Further Plans for CERN-KEK Collaboration Tatsushi NAKAMOTO KEK CERN-KEK Committee, 6th meeting, CERN, Dec. 14, 2011.

2. Introduction and Reminder • Magnet R&D review by CERN's experts (L. Rossi, G. de. Rijk) in Dec. 13. • Presentation files can be downloaded from Indico. • Digest of progress report will be presented. • New R&D plans will be proposed. • Proposal at the last committee: Wiredrawing trial R&D for RHQ-Nb3Al until the middle of JFY2011. • If success, we may go for a long wire production. If failed, … • Results, Judgment • Magnet R&D for HiLumi-LHC upgrade • Conceptual design study for the beam separation dipole (D1) • Neutron irradiation • Radiation resistance materials development • New R&D Plans

3. from the Meeting Dec. 2010 For High Field Accelerator Magnet

4. from the Meeting Dec. 2010

5. from the Meeting Dec. 2010

6. from the Meeting Dec. 2010

7. from the Meeting May 2011

8. Summary of RHQ-Nb3Al Development • Non copper Jc: 1200 A/mm2 @12 T, 800 A/mm2 @ 15T • Still half of Nb3Sn-RRP • Magnetization: Deff= 40 mm and no flux jump • Better than Nb3Sn-RRP (Deff >70 mm) • Stress sensitivity: No degradation up to transversal compressive stress of 210 MPa. • Robustness: No degradation after cabling • Technology development of reel-to-reel electroplating • Difficulty in wiredrawing process

9. Judgments on RHQ-Nb3Al Development • Further basic R&D on Ta material must be required to improve wiredrawing property. • - Fundamental research with a small billet size should be continued. • The Cu-matrix strand shows much better performance in wiredrawing. But, a longer wire processed by a continuous RHQ facility should be necessary. • - We would like to proceed with the 1-km class (400 ton extrusion) Cu-matrix strand development. • - This development will be covered by NIMS at this time. • Even though RHQ-Nb3Al superconductor has a potential to be utilized for the high field accelerator application, it is clear that a series of long wire production will not be possible in a next few years and a RHQ-Nb3Al model magnet cannot be developed by 2015. Unfortunately, this means that RHQ-Nb3Al will NOT be a candidate for the HiLumi-LHC upgrade.

10. Introduction and Reminder • Magnet R&D review by CERN's experts (L. Rossi, et al.) in Dec. 13. • Presentation files can be downloaded from Indico. • Digest of progress report will be presented. • New R&D plans will be proposed. • Proposal at the last committee: Wiredrawing trial R&D for RHQ-Nb3Al until the middle of JFY2011. • If success, we may go for a long wire production. If failed, … • Results, Judgment • Magnet R&D for HiLumi-LHC upgrade • Conceptual design study for the beam separation dipole (D1) • Neutron irradiation • Radiation resistance materials development • New R&D Plans

11. New D1 for HiLumi LHC Upgrade Schematic layout of the LHC • New Q1-Q3 and D1: large bore, high field, radiation hard. • Engagement of KEK in WP3 (Magnets) of FP7-HiLumi LHC. • Q. Xu (KEK) stationed at CERN for 6 months/y from March 2011. • Conceptual design for a large aperture D1 dipole with NbTi cable. Current D1 (MBX) at IR2 & IR8 Current D1 (MBXW) at IR1 & IR5 Schematic layout of the right side of IR1 (ATLAS)

12. Design with NbTiLHC dipole inner cable Bore diameter 150 mm Bore diameter 130 mm

13. Neutron fluence at HiLumi LHC: ~1022 n/m2 • Increase of rof stabilizer starts around 1020 n/m2. • >> Stability and quench protection might be compromised in HiLumi LHC magnets. • Low temperature irradiation facility at KUR: • Tmin. around 10 K • Collaboration with COMET-Mu2e experiment. Neutron Irradiation at Cold Copper and 5N-Aluminum samples • Observed Drirr = 0.022 nW.m for 2.7x1020 n/m2 (>0.1MeV) • Agreed with the previous work within a factor of 2. • Estimation: initial RRR of 200would be degraded to be: • RRR of 160 – 190 @1020 n/m2 • RRR of 50 – 120 @1021 n/m2 • Recovery by annealing in cooper sample and its multiple irradiation are planned in 2012.

14. Development of Radiation Resistant Materials Synergy development with J-PARC beam line magnets and COMET-Mu2e. • New Cyanate Ester base resin for accelerator HFM application (LHC upgrade) • 60 Cyanate Ester / 40 Epoxy • low viscosity, reaction < 150 °C • pot life: 24hr@ 60 °C, < 20 cP • Development of insulation coating technologies on metallic parts (i.e. end spacers, wedges) • Ceramic spray • Polyimide coating by Vapor Deposition Polymerization technology. • Materials development using BT (Bismale-imideTriazine) resin andCyanate Ester/Epoxy resin. • Epoxy: NG!! • Necessary for the new D1!! • Prepreg tape (curing at 150 °C) • GFRP BT resin: e irradiation (T. Sasuga, Polymer Vol. 27, 1986, 681) Plan: Gamma-ray irradiation at JAEA-Takasaki

15. (Unit:JYen) Accounting of CERN-KEK Collab. Total 93 MJYen for JFY2009-2011 (Initial proposal was 105 MJYen)

16. Introduction and Reminder • Magnet R&D review by CERN's experts (L. Rossi, et al.) in Dec. 13. • Presentation files can be downloaded from Indico. • Digest of progress report will be presented. • New R&D plans will be proposed. • Proposal at the last committee: Wiredrawing trial R&D for RHQ-Nb3Al until the middle of JFY2011. • If success, we may go for a long wire production. If failed, … • Results, Judgment • Magnet R&D for HiLumi-LHC upgrade • Conceptual design study for the beam separation dipole (D1) • Neutron irradiation • Radiation resistance materials development • New R&D Plans

17. Future LHC Upgrades and Collaboration Frameworks Next Slides Time Scale Current R&D Collaboration Framework: • NbTi, A15 SC • High Field ~ 13 T • Radiation Resistant 2020 HiLumi LHC Upgrade • Another R&D Collaboration Framework: • HTS • High Field ~ 20 T HE LHC Upgrade 2030?

18. New Grants Approved and New R&D Plan • "Strategic Young Researcher Overseas Visit Program for Accelerating Brain Circulation" (Prof. K. Tokushuku, KEK) for JFY 2010-2012 was approved. • Covering travel expenses to/at CERN for Q. Xu as well as relevant supervisors (A. Yamamoto, T. Nakamoto, others). • In July 2011, a new Japanese research grant (KAKENHI) related to the LHC experiment until 2016 was approved for a research consortium including KEK. • “Development of high field accelerator magnet” is one of the research subjects in this project and about 10 MJYen per year will be provided until JFY2015 (totally 50 MJYen for 5 years). • Support from Cryogenics Science Center at KEK and D.G. • e.g.) Repair of a power supply. Renovation of test stand for the subscale magnet (17 MJYen) in Dec. 2011. • Combining with the CERN-KEK collaboration budget (71 MJYen remaining), we would like to propose ”Development towards the D1 beam separation dipole magnet for the HiLumi LHC upgrade”and"Fundamental R&D for high field, radiation resistant accelerator magnets".

19. Development towards the D1 Beam Separation Dipole Magnet • Mainly covered by CERN-KEK budget • Participation of KEK (beneficiary w/o funding) to EC-FP7: HiLumi LHC. • Conceptual Design of NbTi (or Nb3Sn) magnet for the D1 beam separation dipole under high radiation environment. • Conceptual design for HiLumi LHC by Q. Xu stationed at CERN with a support of Japanese grant. • NbTi is a current baseline. Final choice of the conductor (NbTi or Nb3Sn) in the middle of 2012. • Engineering design as a cooperative work with an industry (multiple years) will be followed. • Specification: 40 Tm, 130-150 mm single aperture, modest field (6 T). • Issues to be solved • stress management in a large aperture coil, • radiation resistance (~1022 n/m2, several 10 MGy), • cooling capability with HeII under large energy deposition (~100 W), • iron saturation on field quality.

20. Development towards the D1 Beam Separation Dipole Magnet (continued) • Deliverables: Design study report. Engineering design including a set of drawings for the cold mass fabrication. • Note: Performance evaluation of the model magnet is absolutely necessary before starting construction of the production magnets. However, development and test of the 1.5 m long model magnet CANNOT be made within the current budget and resources. Therefore, we would like to request a NEW BUDGET to the Director Generals of KEK and CERN to complete the model magnet program including the conceptual design study, engineering design, construction and testing of the model magnet. A cross-sectional mechanical model (0.2 m long) including the practice coil fabrication would be made within the current budget. • Cost effective development by reuse of jigs, tooling and facilities of the J-PARC SCFM.

21. Fundamental R&D for High Field, Radiation Resistant Accelerator Magnets • Mainly covered by the Japanese grant, resources • Most of the following items are continuation of the current activity. • Magnet assembly and testing of a hybrid (Nb3Al and Nb3Sn) sub-scale magnet at KEK. • 4 coils & 5 coils configurations • Completion of K5 strands and cabling • Fundamental study on Nb3Sn-bronze strand/cable • Back up for the D1 model with NbTi • degradation by cabling, mechanical property with 10 stack samples, sub-scale magnets. • Stress/strain dependence study at the neutron diffractometer at J-PARC and the High Field Lab. in Tohoku Univ. • Support to develop RHQ-Nb3Al • Cu-matrix wire: demonstration of continuous RHQ process, • Ta-matrix wire: improvement of wire breaking • Development of a mirror quadrupole magnet with the RHQ-Nb3Al cable in collaboration with Fermilab.

22. Fundamental R&D for High Field, Radiation Resistant Magnet (continued) • Radiation resistant materials development • Radiation resistant resin (BT, Cyanate Ester) for prepreg tape, GFRP. • Insulation coating on metal parts: polyimide, ceramic spray • Gamma-ray irradiation test (RT, LN2??) at JAEA-Takasaki • Low temperature neutron irradiation test at KUR • Stabilizer (cooper, aluminum) for superconductor • recovery behavior (annealing effect)

23. Mainly covered by CERN-KEK budget Unit: kJYen R&D Plan and Budget Proposal *Profile is not clear yet. Not included. Mainly covered by Jap. grants. To be provided by CERN Not included. Not included. Additional budget to complete the program: 113 MJYen

24. Future LHC Upgrades and Collaboration Frameworks Time Scale Current R&D Collaboration Framework: • NbTi, A15 SC • High Field ~ 13 T • Radiation Resistant 2020 HiLumi LHC Upgrade • Another R&D Collaboration Framework: • HTS • High Field ~ 20 T HE LHC Upgrade 2030?

25. R&D Collaboration in Another Framework • In collaboration with Kyoto University and other institutes, KEK is developing fundamental technologies of accelerator magnets using HTS tapes for cancer therapy and accelerator driven sub-critical reactor. • KEK will keep this effort in future and the technology will be extended to a high field accelerator magnet development that may contribute HE-LHC. • KEK has discussed with CERN to be an associate partner (no obligation) of Eucard2 for HE-LHC.

26. Summary • Magnet R&D for the HiLumi LHC upgrade have been carried out at KEK. • While some advantage, RHQ-Nb3Al will not be ready for the production for the HiLumi LHC upgrade. • Development towards the beam separation dipole magnet (D1) is proposed as a main item of the collaboration in JFY2012-2015. • Participation of KEK (beneficiary w/o funding) to EC-FP7: HiLumi LHC. • Design study report will be the deliverable. • Apart from this, we would like to request the additional budget (~110 MJYen), which is necessary to complete the model magnet development and its performance evaluation. • Fundamental R&D for high field, radiation resistant accelerator magnets is also proposed. New materials development for the D1 is included. • To carry out the R&D programs above, the money transfer of 18 MJYen for JFY2012 is requested. In 4 years until JFY 2015, a total amount of money transfer will be ~71 MJYen (= 831,310.52 CHF). • A new R&D collaboration for development of high field accelerator magnets using HTS technology towards HE-LHC has been discussed between CERN and KEK.

27. Appendix

28. Some information and comments • Remaining amounts in the account T290320 is 831,310.52 CHF as of Sep. 29, 2011. >> 71,000 kJYen • Cost estimates from the industry is the following. • Yoke dies modification + New set of collar dies >> 25,000 kJYen added in "Materials". • For the cold test at KEK, some renovation cost will be necessary. It is still possible to carry out the cold test at CERN instead of KEK. Unit: kJYen

29. Appendix: Slides from Dec. 2010

30. Appendix: Slides from Dec. 2010