D Schulte L Bottura B Goddard M Jimenez Programme Pleas for Help and a Promise Please help by signing up for the email lists FCChh designcernch FCChh beamdynamicscernch ID: 1009516
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1. Hadron Collider Breakout Session SummaryD. Schulte, L. Bottura, B. Goddard,M. Jimenez
2. Programme
3. Pleas for Help and a Promise …
4. Please help by signing up for the email listsFCC-hh-design@cern.chFCC-hh-beamdynamics@cern.chFCC-hh-injectors@cern.chFCC-hh-technologies@cern.chFCC-hh-magnets@cern.chreviewing and improving our parametershelping to prepare choices for the baseline designpreparing the future collaborationConclusionWill have video meetingsWill provide a list of critical issuesActual work needed already now
5. Some Volunteers …
6. F. Petrov
7. A. Seryi
8. S. Chattopadhyay, Cocroft
9. Some Things to Address …
10. M. JimenezTechnology Challenges and BreakthroughsHave a list with technical challenges that need to be addressedAnd breakthroughs that are required (will push technology in general)Very good place to find your favorite subject for the collaboration
11. M. SchaumannFirst Look at the Ion performanceIon luminosity seems good using LHC injector chainMain luminosity limitations are from the injector chainIons place a significant constraint on interaction region design
12. Magnets …
13. Breakout-magnets: summaryL. BotturaThoughts on a Friday nightValentine’s day, 2014
14. SuperconductorsMaterial research: the FCC superconductors are not looking like anything we know from the past, nor HL-LHC. The present potential for improvement is in the range of 20 %... 50%, not enough5 years target: work on carrier density, pinning, grains to improve performance in present high-field materials 10 years target: consider other materials (Fe-based, MgB2, round REBCO)Very large scale material requirements for LTS (10x ITER Nb3Sn production) and HTS (much above anything done so far)Actions proposed:Launch a focussed 16 T Nb3Sn conductor program (factor 2 Jc at 18 T)Pursue work on HTS materials to make them suitable for accelerator magnetsConsider other issues (protection, filaments/field quality, homogeneity and yield for low cost)The LTHFSM Workshop could be an incubation center for material R&DOpen questions:Are exotic materials (Fe-based SC) a realistic candidate for R&D ?
15. Magnet technologyHL-LHC and companion HFM programs are exploring the 11...13 T operating field range, with ultimate field levels that are relevant to FCC (Fresca2), much experience can be drawn from these programsIs there a “barrier” at 15 T, or is this only perceived as such ? In the 16…20 T field range it is not clear what is the best geometry (block, cos-theta, CCT), examine them allThe present design margin, in the range of interest, is very large (20 %) – how to decrease it ?Training, we cannot afford so many (> 10) quenchesMagnet protection is an issue both for LTS (energy density vs. JE) and HTS (propagation speed and detection)
16. Matters of optimaTunnel length, operating field and temperature, SC material selection, are parameters affecting greatly the location of the optimum (minimum cost, maximum performance)Other constraints (e.g existing infrastructure), and benefits (e.g. the value of R&D at the field frontier) must be considered
17. My Comments on MagnetsVery interesting for a non-expertMuch to be learned, thanks for the insightVery active fieldQuite some interaction with other experts required for optimisationShould not forget the insertion magnetsGoal for b*=0.1m (Rogelio Tomas)Challenges magnetsBut helps for overall designFaster ramp of LHC magnets (O(3minutes)) appears possibleBut some studies to be performedMany issues of LHC re-use as injectorsNeed to evaluate aperture needs for injector in 100km ringAdded some slides in the reserve on the different individual talks
18. In practiceDefine a direction for relevant R&D, set challenging (but realistic) targets, describe impact of this technology on other fields, and describe a development plan into a roadmap document to be contributed by the collaborators and edited within the scope of the FCC studyThis roadmap document will become a reference for future accelerator magnets R&D proposals (e.g. US-DOE, Horizon 2020), and can be used as a basis of collaboration for FCC design and hardware R&D workTime scale: 3 months (tough !)
19. First volunteersAlso some private discussions with no presentationList of critical items to work on is progressingTechnical items shown by MiguelPromised to produce first draft soonVery good discussion on magnetsProgress visibleStill new design ideasWorkplan in preparationWill continue with video meetingsConclusionMany thanks to the speakers and the chair Mike Syphers for almost keeping the scheduleAnd to all participants
20. The Summary that I Cannot Show
21. Some Key Points from the TalksD.S., Brennan Goddard
22. MagnetsDavid Larbalestier: LTS and HTS Material Issues for 16 and 20 T ApplicationsNb3Sn is still plan ABut have HTS cable, still issues to be addressedAmalia Ballarino: Material R&D toward 16-20T horizonITER first large-scale user of Nb3Sn (800 A/mm2 at 12 T, 4.2 K): 500tHL-LHC needs 2500 A/mm2 at 12 T, 4.2 KFCC with 16 T magnets: 4,500 tons of Nb3Sn and 10,000 tons on NbTiFCC with 20 T: 1,400 tons HTS, 6,300 tons Nb3Sn, 11,000 tons NbTi
23. MagnetsPaolo Ferracin: Overview of HiLumi low beta and FRESCA2 magnetsFRESCAII is block magnet to test HTS insertsForces and stresses on coil for FRESCA2 comparable to 16-20 T coilsMikko Karpinnen: 11T ExperienceMany lessons learned from the 11T work for the HL upgradeSteve Gourlay: SC Magnet Developments Towards 16T Nb3SN DipolesA slanted solenoid design looks attractive and should be tested
24. MagnetsEzio Tedesco: Design Options for the 15-20T RangeWe should review the design margin, it cost a lotPeter McIntyre: Low Cost Magnet DesignWe should think about the cost not focus only on the fieldAttilio Milanese: Injector Magnet ConsiderationsThe LHC magnets can be made to ramp up in 3 minutes, with some sissues to be addressedRogelio Tomas: Insertion Magnet ChallengesInsertion magnets are also importantShould aim for b=0.1m
25. David Larbalestier: LTS and HTS Material Issues for 16 and 20 T Applications
26. 16 T for 100 TeV in 100 km16 T magnet in 100 km tunnel Width (mm)Average radius (mm)Overall Jc (A/mm2)Strand Jc (eng) (A/mm2)Conductor mass (t)Nb3Sn layer 120 30 193 386 1690 Nb3Sn layer 220 50 385 770 2710 20 mm collar Nb-Ti layer 115 87.5 337 523 4710Nb-Ti layer 215 102.5 433 67255204300 tons Nb3Sn + 10200 tons of Nb-TiCosine theta type magnet, Nb-Ti and Nb3Sn. Bore = 40 mm9 times Nb3Sn for ITER and Nb-Ti for LHCA. Ballarino, CERNMaterial R&D toward 16-20T horizonITER will be first large-scale (500t) user of Nb3Sn, with 800 A/mm2 at 12 T, 4.2 KHL-LHC needs 2500 A/mm2 at 12 T, 4.2 KTotal amount of conductor needed for 16 T magnets in 100 km collider would be about 4,500 tons of Nb3Sn and 10,000 tons on NbTiFor 20 T in 80 km tunnel, 1,400 tons HTS, 6,300 tons Nb3Sn, 11,000 tons NbTiProduction quantity of HTS is huge by today's standards - too early to even start guessing about costAmalia Ballarino
27. Paolo FerracinOverview of HiLumi low beta and FRESCA2 magnetsLow-beta is 7 m long magnet, accelerator quality coils and magnet at 12 T operational field level, Nb3Sn, cos2thetaFRESCA2 is aiming at 15 T dipole field for HTS insert tests, not accelerator quality, block coilsForces and stresses on coil for FRESCA2 comparable to 16-20 T coils
28. Mikko Karpinnen11T ExperienceMany lessons learned from the 11T work for the HL upgradeCannot list them hereUseful input for future R&D
29. The Canted Cosine-Theta (CCT) MagnetSuperconducting Magnet Group - S.Caspi“perfect” current distributionSteve GourlaySC Magnet Developments Towards 16T Nb3SN DipolesDifferent winding scheme potentially could make magnets cheaper by reducing stressParadigm change?This seems well worth exploring
30. Ezio TedescoDesign Options for the 15-20T RangeNeed to review required margin
31. Low Cost Magnet DesignShould consider an overall cost optimisation leaving the dipole field as a free parameter5 T 10 K dipole is excellent candidate for rapid-cycling injectorPeter McIntyre
32. Attilio MilaneseInjector Magnet ConsiderationsDifferent options of injector magnets investigatedSPS with Nb3Sn magnets takes 5-10 minutes to ramp, require 25 rampsLHC magnets can likely ramp faster than now with some modifications in the power supplies (2-3 minutes)Option with normal magnets in the 100km ring need to be reviewed for impedance and required aperture
33. R. TomasInsertion Magnet ChallengesThe interaction region contains challenging magnetsThey can drive the system designThe interaction region impacts the overall design strongly(the beta-function determines the required beam current)Should aim for beta-function of 0.1mHigh field magnet development essential even if cost is high