1. MQXF Preliminary Dose Requirement G. Ambrosio, E. Fornasiere, E. Todesco Joint LARP/CM20 HiLumi meeting Napa Valley, CA, USA 8-10 April, 2013 The HiLumi LHC Design Study is included in the High Luminosity LHC project and is partly funded by the European Commission within the Framework Programme 7 Capacities Specific Programme, Grant Agreement 284404 Work supported by the US LHC Accelerator Research Program (LARP) through US Department of Energy contracts DE-AC02-07CH11359, DE-AC02-98CH10886, DE-AC02-05CH11231, and DE-AC02-76SF00515

2. Requirements  DOSE Requirements Coil structural req. – Min shear strength – Max allowable swelling Electrical req. Energy deposition and heat evacuation req. – Max DT – Minimum thermal conductivity Quench protection and stability req. – Minimum copper RRR 09/04/2013 G. Ambrosio, E. Fornasiere and E. Todesco2

3. Elvis Fornasiere | CERN, 26 th February 2013 TE-MSC-MDT Acknowledgments: G. Ambrosio, F. Cerutti, S. Clément, L. S. Esposito, P. Ferracin, P. Fessia, R. Flukiger, R. Gauthier, M. Juchno, A. Mereghetti, N. Peray, J.-C. Perez, G. de Rijk, E. Todesco, Radiation resistance of insulation systems for IR Triplets - Summary

4. 4 Relative mechanical properties for CTD-101K Elvis Fornasiere | CERN, 26 th February 2013 TE-MSC-MDT OutlineOutline Structural req + energy deposition Measurement techniques CTD-101K + CE-epoxy results ILSS 0 ≈ 120 MPa 30% degradation at 50 MGy [29]+[30]+[31]+[32]+[33]+[34] UTS: 35% reduction at 180 Mgy from UTS 0 ~ 1050 MPa Compressive strength = 1080 MPa at 160 Mgy (Loss 20%) Fracture Resistance G IC : 66% reduction at 230 MGy 95% degradation at 160 MGy PlanPlan 70% degradation at 90 MGy

5. 5 OutlineOutline Stress in the coil Elvis Fornasiere | CERN, 26 th February 2013 TE-MSC-MDT Structural req + energy deposition Measurement techniques CTD-101K + CE-epoxy results PlanPlan ~0 MPa shear 30-40 MPa shear     Shear stress Max-gradient (155 T/m) 160 MPa compression stress Risk of tensile stress Azimuthal stress Observation of Shear stress between turns and shear between inner and outer layers

6. 6 Suggested plan Internal test campaign prior to irradiation campaign (unirradiated fibers) SBS test of heat treated fibers with 3 resins (CTD-101K, CE/epoxy blend, MY750) Resin with 1)virgin fiber, 2) 50h @700°C fiber, 3) 50h @700°C ht fiber + ceramic binder + 4) 50h @700°C ht fiber + PVA 10° off axis-test as support of SBS test Shear/compression test of the system [cable + insulation] Irradiation campaign (to be discussed) What is the maximum dose level (20 MGy)? SBS – Interlaminar shear test (qualitative) Shear/compression test of the system [cable + insulation] (Quantitative) Elvis Fornasiere | CERN, 26 th February 2013 TE-MSC-MDT CTD-101KMY750CE Virgin fibers Fibers after reaction Fibers after reaction and ceramic binder SBS + Tensile +/- 10° + shear/compression PlanPlan OutlineOutline Structural req + energy deposition Measurement techniques CTD-101K + CE-epoxy results Tests to be performed on samples with all features of QXF coils

7. 26 July 2012, joint WP2, WP3, and WP10 meeting Beam screen shielding Beam screen with W absorbers at mid-planes * 0.5 mm clearance between BP and W 7 Minimum aperture requested from optics is 116 mm To go below 20 MGy one would need 2 mm BS + 9 mm W absorbers (105.6 mm residual aperture) Maximum thickness shielding for Q1-first half Q2A tailor-made Possible use of other materials for BS/CB under investigation With courtesy of F. Cerutti, L.S. Esposito on behalf of CERN FLUKA team [1] 140 mm Nb 3 Sn Structural req + energy deposition With 150 mm aperture 3.7 mm BP + 2 mm BS + 9 mm W absorber  Dose < 20 MGy

8. Requirements  DOSE Requirements Coil structural req. – Min shear strength< 20 MGy OK prelim. – Max allowable swelling Electrical req.< 20 MGy OK Energy deposition and heat evacuation req. – Max DT< 20 MGy OK prelim. – Minimum thermal conductivity Quench protection and stability req. – Minimum copper RRR 09/04/2013 G. Ambrosio, E. Fornasiere and E. Todesco8

9. Max Allowable Temperature During Quench T hot-spot < 350 K using CTD-101K Detailed analysis in WAMSDO proceeding: – G. Ambrosio “Maximum Allowable Temperature During Quench in Nb3Sn Accelerator Magnets” To be confirmed by tests with high_temperature quenches in magnets with cored cable 09/04/2013 G. Ambrosio, E. Fornasiere and E. Todesco9