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Progress Report on Magnet R&D and Further Plans

for CERN-KEK Collaboration

Tatsushi NAKAMOTOKEK

CERN-KEK Committee, 6th meeting, CERN, Dec. 14, 2011.

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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

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from the Meeting Dec. 2010For High Field Accelerator Magnet

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from the Meeting Dec. 2010

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from the Meeting Dec. 2010

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from the Meeting Dec. 2010

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from the Meeting May 2011

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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

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• 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.

Judgments on RHQ-Nb3Al Development

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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

New D1 for HiLumi LHC Upgrade• 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.

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Schematic layout of the LHC

Schematic layout of the right side of IR1 (ATLAS)

Current D1 (MBXW) at IR1 & IR5 Current D1 (MBX) at IR2 & IR8

Design with NbTi LHC dipole inner cableItem Value Ratio

Bore diameter 150 mm (MBXE) 130 mm (MBXD) 1.15

Nominal field (dipole) 6.35 T 6.48 T 0.98

Operating current 9.3 kA 9.2 kA 1.01

Field homogeneity <0.01% (Rref=50/43 mm) /

Peak field in the coil 7.06 T 7.08 T 0.997

Load line ratio at 1.9 K(Inner / Outer layer)

70% / 63.7% 70% / 64.8% 1

Stray field @ 0.5 m from center 102 mT 64 mT 1.6

Inductance (low/nominal) 16.1/13.6 mH/m 12.8/10.6 mH/m 1.28

Stored energy 588.1 kJ/m 448.6 kJ/m 1.31

Peak field/central field 1.11 1.09 1.02

Lorenz force X/Y 2.1/0.97 MN/m 1.96/0.86 MN/m /

Average coil stress in mid plane 71 MPa 57 MPa 1.25

Outer diameter of iron yoke 550 mm /

Strand diameter 1.065 /

Supercon. current density 1000 A/mm2 989 A/mm2 1.0112

Bore diameter 130 mm

Bore diameter 150 mm

Neutron Irradiation at Cold

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Neutron fluence at HiLumi LHC: ~1022 n/m2

Increase of r of 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 KCollaboration with COMET-Mu2e experiment.

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 200 would

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.

Development of Radiation Resistant Materials

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• 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-imide

Triazine) resin and Cyanate Ester/Epoxy resin.– Epoxy: NG!!– Necessary for the new D1!!– Prepreg tape (curing at 150 °C)– GFRP

(T. Sasuga, Polymer Vol. 27, 1986, 681)

BT resin: e irradiation

Plan: Gamma-ray irradiation at JAEA-Takasaki

Synergy development with J-PARC beam line magnets and COMET-Mu2e.

Accounting of CERN-KEK Collab.

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(Unit: JYen)JFY 2009Closing

JFY 2010Closing

JFY 2011Prediction

Magnet R&D

Jigs, Yoke, Shell 2,088,790 2,377,581Coil 3,816,210 Own Effort 2,449,627PS, DAQ, Cryostat 2,414,430 0 Own Effort

Wires and cable for the magnet

Further processes for the previous year's precursor 6,226,080 Carry over

2.5MJYen 2,500,000

Precursor (1 km)6,636,000 Carry over

7.0MJYen To be canceled

Cabling Fermilab Collab.

Fermilab Collab. -

consumable 1,273,125 4,470,046 261,647Long wire production R&D 0 5,899,950 Own Effort

Fundamental Study

15T Solenoid, Jc Stress Depend. 13,488,300 0 Own EffortThermal conductivity meas. 3,777,900 155,400 Own EffortCyanate ester resin, Gamma ray irradiation 1,102,668 247,594 1,721,357Neutron diffraction, Strain Study 10,124,887 1,725,484 536,573Short strand R&D 4,326,272 1,447,793 0Fellow - - 6,900,000

Travel Expenses 814,128 4,464,943 1,753,215

Total 54,000,000 20,500,000 18,500,000Total 93 MJYen for JFY2009-2011(Initial proposal was 105 MJYen)

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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

Future LHC Upgrades and Collaboration Frameworks

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HiLumi LHC Upgrade

HE LHC Upgrade

2020

Time Scale

2030?

Current R&D Collaboration Framework:

– NbTi, A15 SC– High Field ~ 13 T– Radiation Resistant

Another R&D Collaboration Framework:

– HTS– High Field ~ 20 T

Next Slides

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". 18

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.

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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.

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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. 21

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)

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R&D Plan and Budget Proposal2011 2012 2013 2014 2015 item total

D1 model development conceptual design 1.2 FTE

Grant1.2 FTEGrant

1.2 FTEGrant

3.6 FTE year

engineering by industry 10000* 10000* 10000* 9000* 39000

fellow/CAD engineer 7000 7000 7000 7000 28000

hardware - - - - - (81000)

insulated NbTi cable 5000

Cold Test - - (20000)

Travel 1000 1000 1000 1000 4000

sub-total (money transfer from CERN) 18000* 18000* 18000* 17000* 71000

Fundamental R&D

radiation resistant materials 3000+1000 1000 2000 2000 9000

irradiation test (gamma rays, neutron, LN2) 0 + (4000) (4000) (4000) 0 (12000)

stress/strain study for A15, HTS 1000 + 1000 1500 1500 1000 6000

thermal cond. study 0 + 2000 500 500 500 3500

RHQ-Nb3Al Sub-scale magnet 0 + 7500 4000 500 500 12500

Nb3Sn Sub-scale magnet 6000 + 2000 2000 1500 1000 12500

RHQ-Nb3Al SC 0 + 500 4000 0 0 4500

Travel 0 + 1000 1000 1000 1000 4000

sub-total 25000 14000 7000 6000 52000

Total 43000* 32000* 25000* 23000* 123000

Unit: kJYenMainly covered by CERN-KEK budget

Mainly covered by Jap. grants.

Not included.

Not included.

Not included.

To be provided by CERN

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Additional budget to complete the program: 113 MJYen

*Profile is not clear yet.

Future LHC Upgrades and Collaboration Frameworks

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HiLumi LHC Upgrade

HE LHC Upgrade

2020

Time Scale

2030?

Current R&D Collaboration Framework:

– NbTi, A15 SC– High Field ~ 13 T– Radiation Resistant

Another R&D Collaboration Framework:

– HTS– High Field ~ 20 T

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. 

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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.

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Appendix

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Some information and comments

Unit: kJYen

• 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.•

　 1st estimate by an industry

revision by TN at 11 Nov., 2011

Material 35480 60480 Assembly 31860 16764 Test 1770 1770 Design 78890 39445 Administration 37000 14495 Discount -30000 -13000 Tax 7750 5498 Total 162750 125452 28

Appendix: Slides from Dec. 2010

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Appendix: Slides from Dec. 2010

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