on behalf of the Phase II Collimation Design team Phase II Collimators at CERN: Project Status and Progress in WP 8.2 and 8.3 Col/Mat WP8 Meeting 13th September 2010 N. Mariani on behalf of the Phase II Collimation Design team

Outline Where we are: BPM Prototype installed on SPS 1st Phase II Prototype (P1) with Glidcop Jaws ready for brazing New Materials R&D: Metal-Diamond and SiC Development of new materials Characterization of thermal, mechanical and physical properties Radiation Hardness Beam Shock Resistance (HiRadMat) Conclusions 2 2

BPM Collimator Prototype First Tests with SPS Beam show a good behavior of integrated BPMs allowing a dramatic improvement in set-up time. Data courtesy: D. Wollmann (BE/ABP) 3 3

OFE-Copper Cooling Circuit Molybdenum Back-stiffener 1st Phase II Prototype (P1) OFE-Copper Cooling Circuit GlidCop Jaw SS Jaw Stiffener Molybdenum Back-stiffener

Metal-Diamond Composites Copper-Diamond (CuCD): Developed at AIT (Austrian Institute of Technology) E. Neubauer and M. Kitzmantel Molybdenum-Diamond (MoCD): Developed at BrevettiBizz (Verona - Italy) S. Bizzaro MoCD Samples produced at BrevettiBizz (First Attempt): 30% Diamond, 60% Mo, 10% Cu CuCD Plate produced at AIT: 60% Diamond, 39% Cu, 1% B 5 5

Expected value of Composite CuCD Characterization Thermo Physical properties measured at AIT and CERN (ρ, CTE, Cp estimated by ROM, K), and at CERN (ϭ) Density (g/cm3) Cp (J/KgK) K (W/mK) CTE (10-6 K-1) Ϭ %IACS (MS/m) Expected value of Composite 5.61 442 615 (by H&J Model) 6.25 (by Turner Model) 23.7% (13.7) (by LW formula) Measured 5.33 ~ 420* ~ 490 ±40 6-8 21.7% (12.6) % of Th. Value 95.02% 95% ~ 80 % - ~ 91.5 % SEM Fracture Surface Analysis shows poor adhesion between Diamond and Cu Good Results... But still work to do: AIT : Thermal properties from RT to 1000°C; Mechanical properties 2) Politecnico di Torino: Mechanical properties from RT to 1000°C. 3) EPFL: CTE from 20°C to ~900°C 4) Kurchatov Institute and GSI: Radiation Damage

Good preliminary results, work still to do... MoCD Type A Characterization Good Adhesion and matrix strength (some diamond particles broke during fracture) but... Bad compaction rate of matrix results in poor thermo physical properties Density (g/cm3) K (W/mK) s %IACS (MS/m) Flexural Strength (MPa) Expected value 8.07 573* (by ROM Model) 23.2% (13.5) (by LW Formula) - Measured 6.8-7.5 ~ 110 3.5-5.2% (2-3) 140 ± 20 % of Th. Value 84-93% ~ 19.2 % ~ 15-22% Good preliminary results, work still to do...

CVD SiC Characterization Microcertec CVD SiC (STD Res. 100-1000Ωm) CTE at EPFL (L.Weber) Thermal Properties at AIT (W.Hohenauer) Cp from 700 J/KgK RT to 1150 J/KgK at 1000°C Next Steps: - Impedance by Stripline Method (H.Day,CERN BE/ABP) - Radiation Hardness at KI

Radiation Hardness No news yet from GSI on CuCD and Beam Parameter Foreseen Work from Working Plan of EuCard activities: GSI: Characterization before and after irradiation (radiation damage, nanoindentation of matrix, in-situ SEM analysis) Material: CuCD (MoCD?) Kurchatov Institute: Measures of Mechanical, Physical and Thermal Properties before and after irradiation on KI beam. Materials: CuCD, SiC (MoCD?) CERN (FLUKA Team): Perform FLUKA simulations reproducing tests conditions both at GSI and KI to compare results: need to scale DPA results from MeV to TeV in order to estimate LHC irradiation level and materials effective degradation. No news yet from GSI on CuCD and Beam Parameter

FEM simulations to scale HiRadMat results from SPS to LHC conditions HiRadMat Facility High Radiation to Materials Project: development of a new facility (located in the TCC6-TNC Area) to validate the LHC components in the Accident Scenario Intense Pulsed Beam from SPS (450 GeV) to investigate High Energy Beam shock resistance. Foreseen Timetable 2011: Materials Testing Expected tests of alternative materials (Glidcop, CuCD, CuCD+SiC, Mo, MoCD, MoCD+SiC) and P1. 2012: Beam Impact Final Test on a complete Phase II Collimator for the final Project Validation The experimental results will be used to validate the Thermo Mechanical Modeling carried out in collaboration with Politecnico di Torino (see PoliTo Talk) FEM simulations to scale HiRadMat results from SPS to LHC conditions

Materials R&D Summary CVD SiC: CuCD: MoCD: Thermal Characterization completed. Electrical Characterization on the way (Impedance measures). Still waiting for Radiation Hardness Characterization. CuCD: Material Development Work nearly completed. Very Interesting Results (especially on Thermal Properties). Waiting for Mechanical and Radiation Hardness Characterization MoCD: Interesting results but still work to do on realization process. Very good collaboration with both AIT and BrevettiBizz 11 11 11

Conclusions BPM functional prototype built, installed. First tests at SPS show promising results. New full 1st Phase II Collimator Prototype manufactured and ready for brazing. Testing will start end 2010. New materials R&D in full swing. URGENT NEEDS: Radiation Hardness Characterization must start as soon as possible on CuCD and SiC at KI and GSI. 12 12 12

THANKS FOR YOUR ATTENTION Phase II Collimators at CERN: Project Status and Progress in WP 8.2 and 8.3 Col/Mat WP8 Meeting 13th September 2010 THANKS FOR YOUR ATTENTION